Currently, the regulator framework informs us before calling into
their unused cleanup paths, which eases at least some debugging. The
same could be beneficial for clocks, so that random shutdowns shortly
after most initcalls are done can be less of a guess.
Add a pr_info before disabling unused clocks to do so.
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230307132928.3887737-1-konrad.dybcio@linaro.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
It is preferred to use typed property access functions (i.e.
of_property_read_<type> functions) rather than low-level
of_get_property/of_find_property functions for reading properties. As
part of this, convert of_get_property/of_find_property calls to the
recently added of_property_present() helper when we just want to test
for presence of a property and nothing more.
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230310144701.1541504-1-robh@kernel.org
Acked-by: Chunyan Zhang <zhang.lyra@gmail.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
case with the CLK_OPS_PARENT_ENABLE flag combined with clk_core_is_enabled()
where it hangs the system. We'll simply assume the clk is disabled if the
parent is disabled and the flag is set. Trying to turn on the parent to check
the enable state of the clk runs into system hangs at boot. We let this bake in
-next for a couple weeks to make sure there aren't any more issues because the
last attempt to fix this ran into hangs and had to be reverted.
Note: There were some more patches to the core framework around sync_state and
disabling unused clks, but I asked for that to be reverted from the qcom PR
because it isn't ready and we're still discussing the best solution on the
list.
Outside of the core clk framework, we have the usual collection of clk driver
updates and support for new SoCs (which seems to never stop). The dirstat is
dominated by Qualcomm because they added support for quite a few SoCs this time
around and also migrated quite a few of their drivers to clk_parent_data. The
other big diff is in the Mediatek clk drivers that saw a significant rework
this cycle to similarly modernize the code, and we'll see that work continue in
the next cycle as well. Nothing really jumps out as scary here, except that the
significant churn in parent data descriptions can have typos that go unnoticed.
More details below.
Core:
- Honor CLK_OPS_PARENT_ENABLE in clk_core_is_enabled()
New Drivers:
- Add a new clk-gpr-mux clock type and use it on i.MX6Q to add ENET ref
clocks
- Support for Mediatek MT7891 SoC clks
- Support for many Qualcomm clk controllers:
- QDU1000/QRU1000 global clock controller
- SA8775P global clock controller
- SM8550 TCSR and display clock controller
- SM6350 clock controller
- MSM8996 CBF and APCS clock controllers
Updates:
- Various cleanups and improvements to Mediatek clk drivers to reduce
code size and modernize the drivers
- Support for Versa 5P49V60 clks
- Disable R-Car H3 ES1.*, as it was only available to an internal
development group and needed a lot of quirks and workarounds
- Add PWM, Compare-Match Timer (TIM), USB, SDHI, and eMMC clocks and
resets on Renesas RZ/V2M
- Add display clocks on Renesas R-Car V4H
- Add Camera Receiving Unit (CRU) clocks and resets on Renesas RZ/G2L
- Free the imx_uart_clocks even if imx_register_uart_clocks returns early
- Get the stdout clocks count from device tree on i.MX
- Drop the clock count argument from imx_register_uart_clocks()
- Keep the uart clocks on i.MX93 for when earlycon is used
- Fix SPDX comment in i.MX6SLL clocks bindings header
- Drop some unnecessary spaces from i.MX8ULP clocks bindings header
- Add imx_obtain_fixed_of_clock() for allowing to add a clock that is
not configured via devicetree
- Fix the ENET1 gate configuration for i.MX6UL according to the
reference manual
- Add ENET refclock mux support for i.MX6UL
- Add support for USB host/device configuration on Renesas RZ/N1
- Add PLL2 programming support, and CAN-FD clocks on Renesas R-Car V4H
- Add D1 CAN bus gates and resets for Allwinner
- Mark D1 CPUX clock as critical on Allwinner
- Reuse D1 driver for Allwinner R528/T113
- Cleanup sunxi-ng Kconfig
- Fix sunxi-ng kernel-doc issues
- Model Allwinner H3/H5 DRAM clock as fixed clock
- Use .determine_rate() instead of .round_rate() for the dualdiv, mpll,
sclk-div and cpu-dyn-div amlogic clock drivers
- DDR clocks were marked as critical in the proper clock driver for each
AT91 SoC such that drivers/memory/atmel-sdramc.c to be deleted
in the next releases as it only does clock enablement
- Patch to avoid compiling dt-compat.o for all AT91 SoCs as only some of
them may use it
- Support synchronous power_off requests in the qcom GDSC driver for proper
GPU power collapse
- Drop test clocks from various Qualcomm clk drivers
- Update parent references to use clk_parent_data/clk_hw in various Qualcomm clk drivers
- Fixes for the Qualcomm MSM8996 CPU clock controller
- Transition Qualcomm MSM8974 GCC off the externally defined sleep_clk
- Add GDSCs in the global clock controller for Qualcomm QCS404
- The SDCC core clocks on Qualcomm SM6115 are moved to floor_ops
- Programming of clk_dis_wait for GPU CX GDSC on Qualcomm SC7180 and SDM845 are
moved to use the recently introduced properties in the GDSC struct
- Qualcomm's RPMh clock driver gains SM8550 and SA8775P clocks, and the IPA clock
is added on a variety of platforms
- De-duplicate identical clks in Qualcomm SMD RPM clk driver
- Add a few missing clocks across msm8998, msm8992, msm8916, qcs404 to
Qualcomm SDM RPM clk driver
- Various Qualcomm clk drivers use devm_pm_runtime_enable() to simplify
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Merge tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux
Pull clk updates from Stephen Boyd:
"We have one small patch to the clk core this time around. It fixes a
corner case with the CLK_OPS_PARENT_ENABLE flag combined with
clk_core_is_enabled() where it hangs the system. We'll simply assume
the clk is disabled if the parent is disabled and the flag is set.
Trying to turn on the parent to check the enable state of the clk runs
into system hangs at boot. We let this bake in -next for a couple
weeks to make sure there aren't any more issues because the last
attempt to fix this ran into hangs and had to be reverted.
Note: There were some more patches to the core framework around
sync_state and disabling unused clks, but I asked for that to be
reverted from the qcom PR because it isn't ready and we're still
discussing the best solution on the list.
Outside of the core clk framework, we have the usual collection of clk
driver updates and support for new SoCs (which seems to never stop).
The dirstat is dominated by Qualcomm because they added support for
quite a few SoCs this time around and also migrated quite a few of
their drivers to clk_parent_data. The other big diff is in the
Mediatek clk drivers that saw a significant rework this cycle to
similarly modernize the code, and we'll see that work continue in the
next cycle as well. Nothing really jumps out as scary here, except
that the significant churn in parent data descriptions can have typos
that go unnoticed. More details below.
Core:
- Honor CLK_OPS_PARENT_ENABLE in clk_core_is_enabled()
New Drivers:
- Add a new clk-gpr-mux clock type and use it on i.MX6Q to add ENET
ref clocks
- Support for Mediatek MT7891 SoC clks
- Support for many Qualcomm clk controllers:
- QDU1000/QRU1000 global clock controller
- SA8775P global clock controller
- SM8550 TCSR and display clock controller
- SM6350 clock controller
- MSM8996 CBF and APCS clock controllers
Updates:
- Various cleanups and improvements to Mediatek clk drivers to reduce
code size and modernize the drivers
- Support for Versa 5P49V60 clks
- Disable R-Car H3 ES1.*, as it was only available to an internal
development group and needed a lot of quirks and workarounds
- Add PWM, Compare-Match Timer (TIM), USB, SDHI, and eMMC clocks and
resets on Renesas RZ/V2M
- Add display clocks on Renesas R-Car V4H
- Add Camera Receiving Unit (CRU) clocks and resets on Renesas RZ/G2L
- Free the imx_uart_clocks even if imx_register_uart_clocks returns
early
- Get the stdout clocks count from device tree on i.MX
- Drop the clock count argument from imx_register_uart_clocks()
- Keep the uart clocks on i.MX93 for when earlycon is used
- Fix SPDX comment in i.MX6SLL clocks bindings header
- Drop some unnecessary spaces from i.MX8ULP clocks bindings header
- Add imx_obtain_fixed_of_clock() for allowing to add a clock that is
not configured via devicetree
- Fix the ENET1 gate configuration for i.MX6UL according to the
reference manual
- Add ENET refclock mux support for i.MX6UL
- Add support for USB host/device configuration on Renesas RZ/N1
- Add PLL2 programming support, and CAN-FD clocks on Renesas R-Car
V4H
- Add D1 CAN bus gates and resets for Allwinner
- Mark D1 CPUX clock as critical on Allwinner
- Reuse D1 driver for Allwinner R528/T113
- Cleanup sunxi-ng Kconfig
- Fix sunxi-ng kernel-doc issues
- Model Allwinner H3/H5 DRAM clock as fixed clock
- Use .determine_rate() instead of .round_rate() for the dualdiv,
mpll, sclk-div and cpu-dyn-div amlogic clock drivers
- DDR clocks were marked as critical in the proper clock driver for
each AT91 SoC such that drivers/memory/atmel-sdramc.c to be deleted
in the next releases as it only does clock enablement
- Patch to avoid compiling dt-compat.o for all AT91 SoCs as only some
of them may use it
- Support synchronous power_off requests in the qcom GDSC driver for
proper GPU power collapse
- Drop test clocks from various Qualcomm clk drivers
- Update parent references to use clk_parent_data/clk_hw in various
Qualcomm clk drivers
- Fixes for the Qualcomm MSM8996 CPU clock controller
- Transition Qualcomm MSM8974 GCC off the externally defined
sleep_clk
- Add GDSCs in the global clock controller for Qualcomm QCS404
- The SDCC core clocks on Qualcomm SM6115 are moved to floor_ops
- Programming of clk_dis_wait for GPU CX GDSC on Qualcomm SC7180 and
SDM845 are moved to use the recently introduced properties in the
GDSC struct
- Qualcomm's RPMh clock driver gains SM8550 and SA8775P clocks, and
the IPA clock is added on a variety of platforms
- De-duplicate identical clks in Qualcomm SMD RPM clk driver
- Add a few missing clocks across msm8998, msm8992, msm8916, qcs404
to Qualcomm SDM RPM clk driver
- Various Qualcomm clk drivers use devm_pm_runtime_enable() to
simplify"
* tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux: (228 commits)
clk: qcom: apcs-msm8986: Include bitfield.h for FIELD_PREP
clk: qcom: Revert sync_state based clk_disable_unused
clk: imx: pll14xx: fix recalc_rate for negative kdiv
clk: rs9: Drop unused pin_xin field
MAINTAINERS: clk: imx: Add Peng Fan as reviewer
clk: sprd: Add dependency for SPRD_UMS512_CLK
clk: ralink: fix 'mt7621_gate_is_enabled()' function
clk: mediatek: clk-mtk: Remove unneeded semicolon
dt-bindings: clock: remove stih416 bindings
dt-bindings: clock: add loongson-2 clock
dt-bindings: clock: add loongson-2 clock include file
clk: imx: fix compile testing imxrt1050
clk: Honor CLK_OPS_PARENT_ENABLE in clk_core_is_enabled()
clk: imx: set imx_clk_gpr_mux_ops storage-class-specifier to static
clk: renesas: rcar-gen3: Disable R-Car H3 ES1.*
dt-bindings: clock: Merge qcom,gpucc-sm8350 into qcom,gpucc.yaml
clk: qcom: gpucc-sdm845: fix clk_dis_wait being programmed for CX GDSC
clk: qcom: gpucc-sc7180: fix clk_dis_wait being programmed for CX GDSC
dt-bindings: clock: qcom,sa8775p-gcc: add the power-domains property
clk: qcom: cpu-8996: add missing cputype include
...
In the previous commits that added CLK_OPS_PARENT_ENABLE, support for
this flag was only added to rate change operations (rate setting and
reparent) and disabling unused subtree. It was not added to the
clock gate related operations. Any hardware driver that needs it for
these operations will either see bogus results, or worse, hang.
This has been seen on MT8192 and MT8195, where the imp_ii2_* clk
drivers set this, but dumping debugfs clk_summary would cause it
to hang.
Prepare parent on prepare and enable parent on enable dependencies are
already handled automatically by the core as part of its sequencing.
Whether the case for "enable parent on prepare" should be supported by
this flag or not is not clear, and thus ignored for now.
This change solely fixes the handling of clk_core_is_enabled, i.e.
enabling the parent clock when reading the hardware state. Unfortunately
clk_core_is_enabled is called in a variety of places, sometimes with
the enable clock already held. To avoid deadlocking, the core will
ignore readouts and just return false if CLK_OPS_PARENT_ENABLE is set
but the parent isn't currently enabled.
Fixes: fc8726a2c0 ("clk: core: support clocks which requires parents enable (part 2)")
Fixes: a4b3518d14 ("clk: core: support clocks which requires parents enable (part 1)")
Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Link: https://lore.kernel.org/r/20230103092330.494102-1-wenst@chromium.org
Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
OMAP was the one and only user.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Tony Lindgren <tony@atomide.com>
Tested-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Frederic Weisbecker <frederic@kernel.org>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20230112195541.844982902@infradead.org
- Tracepoints for clk_rate_request structures
* clk-mediatek:
clk: mediatek: fix dependency of MT7986 ADC clocks
clk: mediatek: Change PLL register API for MT8186
clk: mediatek: Add new clock driver to handle FHCTL hardware
dt-bindings: clock: mediatek: Add new bindings of MediaTek frequency hopping
clk: mediatek: Export PLL operations symbols
clk: mediatek: mt8186-topckgen: Add GPU clock mux notifier
clk: mediatek: mt8186-mfg: Propagate rate changes to parent
clk: mediatek: mt8195-topckgen: Drop flags for main/univpll fixed factors
clk: mediatek: mt8192: Drop flags for main/univpll fixed factors
clk: mediatek: mt6795-topckgen: Drop flags for main/sys/univpll fixed factors
clk: mediatek: mt8173: Drop flags for main/sys/univpll fixed factors
clk: mediatek: mt8183: Drop flags for sys/univpll fixed factors
clk: mediatek: mt8183: Compress top_divs array entries
clk: mediatek: mt8186-topckgen: Drop flags for main/univpll fixed factors
clk: mediatek: clk-mtk: Allow specifying flags on mtk_fixed_factor clocks
* clk-trace:
clk: Add trace events for rate requests
clk: Store clk_core for clk_rate_request
* clk-qcom: (69 commits)
clk: qcom: rpmh: add support for SM6350 rpmh IPA clock
clk: qcom: mmcc-msm8974: use parent_hws/_data instead of parent_names
clk: qcom: mmcc-msm8974: move clock parent tables down
clk: qcom: mmcc-msm8974: use ARRAY_SIZE instead of specifying num_parents
clk: qcom: gcc-msm8974: use parent_hws/_data instead of parent_names
clk: qcom: gcc-msm8974: move clock parent tables down
clk: qcom: gcc-msm8974: use ARRAY_SIZE instead of specifying num_parents
dt-bindings: clocks: qcom,mmcc: define clocks/clock-names for MSM8974
dt-bindings: clock: split qcom,gcc-msm8974,-msm8226 to the separate file
clk: qcom: gcc-ipq4019: switch to devm_clk_notifier_register
clk: qcom: rpmh: remove usage of platform name
clk: qcom: rpmh: rename VRM clock data
clk: qcom: rpmh: rename ARC clock data
clk: qcom: rpmh: support separate symbol name for the RPMH clocks
clk: qcom: rpmh: remove platform names from BCM clocks
clk: qcom: rpmh: drop all _ao names
clk: qcom: rpmh: reuse common duplicate clocks
clk: qcom: rpmh: group clock definitions together
clk: qcom: rpm: drop the platform from clock definitions
clk: qcom: rpm: drop the _clk suffix completely
...
* clk-microchip:
clk: microchip: enable the MPFS clk driver by default if SOC_MICROCHIP_POLARFIRE
clk: microchip: check for null return of devm_kzalloc()
It is currently fairly difficult to follow what clk_rate_request are
issued, and how they have been modified once done.
Indeed, there's multiple paths that can be taken, some functions are
recursive and will just forward the request to its parent, etc.
Adding a lot of debug prints is just not very convenient, so let's add
trace events for the clock requests, one before they are submitted and
one after they are returned.
That way we can simply toggle the tracing on without modifying the
kernel code and without affecting performances or the kernel logs too
much.
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20221018-clk-rate-request-tracing-v2-2-5170b363c413@cerno.tech
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
The struct clk_rate_request is meant to store the context around a rate
request such as the parent, boundaries, and so on.
However, it doesn't store the clock the rate request is submitted to,
which makes debugging difficult.
Let's add a pointer to the relevant clk_core instance in order to
improve the debugging of rate requests in a subsequent patch.
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20221018-clk-rate-request-tracing-v2-1-5170b363c413@cerno.tech
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Since commit b46fd8dbe8 ("clk: Zero the clk_rate_request structure"),
the clk_core_init_rate_req() function clears the struct clk_rate_request
passed as argument.
However, the default value for max_rate isn't 0 but ULONG_MAX, and we
end up creating a clk_rate_request instance where the maximum rate is 0.
Let's initialize max_rate to ULONG_MAX properly.
Fixes: b46fd8dbe8 ("clk: Zero the clk_rate_request structure")
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20221018-clk-range-checks-fixes-v1-3-f3ef80518140@cerno.tech
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Since commit c35e84b097 ("clk: Introduce clk_hw_init_rate_request()"),
users that used to initialize their clk_rate_request by initializing
their local structure now rely on clk_hw_init_rate_request().
This function is backed by clk_core_init_rate_req(), which will skip the
initialization if either the pointer to struct clk_core or to struct
clk_rate_request are NULL.
However, the core->parent pointer might be NULL because the clock is
orphan, and we will thus end up with our local struct clk_rate_request
left untouched.
And since clk_hw_init_rate_request() doesn't return an error, we will
then call a determine_rate variant with that unitialized structure.
In order to avoid this, let's clear our clk_rate_request if the pointer
to it is valid but the pointer to struct clk_core isn't.
Fixes: c35e84b097 ("clk: Introduce clk_hw_init_rate_request()")
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20221018-clk-range-checks-fixes-v1-2-f3ef80518140@cerno.tech
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
If a clock has CLK_SET_RATE_PARENT, but core->parent is NULL (most
likely because it's orphan), callers of clk_core_init_rate_req() will
blindly call this function leading to a very verbose warning.
Since it's a fairly common situation, let's just remove the WARN_ON but
keep the check that prevents us from dereferencing the pointer.
Interestingly, it fixes a regression on the Mediatek MT8195 where the
GPU would stall during a clk_set_rate for its main clock. We couldn't
come up with a proper explanation since the condition is essentially the
same.
It was then assumed that it could be timing related since printing the
warning stacktrace takes a while, but we couldn't replicate the failure
by using fairly large (10ms) mdelays.
Fixes: 262ca38f4b ("clk: Stop forwarding clk_rate_requests to the parent")
Reported-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20221018-clk-range-checks-fixes-v1-1-f3ef80518140@cerno.tech
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
The clk rate range series needed another week to fully bake. Maxime
fixed the bug that broke clk notifiers and prevented this from being
included in the first pull request. He also added a unit test on top to
make sure it doesn't break so easily again. The majority of the series
fixes up how the clk_set_rate_*() APIs work, particularly around when
the rate constraints are dropped and how they move around when
reparenting clks. Overall it's a much needed improvement to the clk rate
range APIs that used to be pretty broken if you looked sideways.
Beyond the core changes there are a few driver fixes for a compilation
issue or improper data causing clks to fail to register or have the
wrong parents. These are good to get in before the first -rc so that the
system actually boots on the affected devices.
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Merge tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux
Pull more clk updates from Stephen Boyd:
"This is the final part of the clk patches for this merge window.
The clk rate range series needed another week to fully bake. Maxime
fixed the bug that broke clk notifiers and prevented this from being
included in the first pull request. He also added a unit test on top
to make sure it doesn't break so easily again. The majority of the
series fixes up how the clk_set_rate_*() APIs work, particularly
around when the rate constraints are dropped and how they move around
when reparenting clks. Overall it's a much needed improvement to the
clk rate range APIs that used to be pretty broken if you looked
sideways.
Beyond the core changes there are a few driver fixes for a compilation
issue or improper data causing clks to fail to register or have the
wrong parents. These are good to get in before the first -rc so that
the system actually boots on the affected devices"
* tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux: (31 commits)
clk: tegra: Fix Tegra PWM parent clock
clk: at91: fix the build with binutils 2.27
clk: qcom: gcc-msm8660: Drop hardcoded fixed board clocks
clk: mediatek: clk-mux: Add .determine_rate() callback
clk: tests: Add tests for notifiers
clk: Update req_rate on __clk_recalc_rates()
clk: tests: Add missing test case for ranges
clk: qcom: clk-rcg2: Take clock boundaries into consideration for gfx3d
clk: Introduce the clk_hw_get_rate_range function
clk: Zero the clk_rate_request structure
clk: Stop forwarding clk_rate_requests to the parent
clk: Constify clk_has_parent()
clk: Introduce clk_core_has_parent()
clk: Switch from __clk_determine_rate to clk_core_round_rate_nolock
clk: Add our request boundaries in clk_core_init_rate_req
clk: Introduce clk_hw_init_rate_request()
clk: Move clk_core_init_rate_req() from clk_core_round_rate_nolock() to its caller
clk: Change clk_core_init_rate_req prototype
clk: Set req_rate on reparenting
clk: Take into account uncached clocks in clk_set_rate_range()
...
- Various clk rate range fixes
- Drop clk rate range constraints on clk_put() (redux)
* clk-rate-range: (28 commits)
clk: mediatek: clk-mux: Add .determine_rate() callback
clk: tests: Add tests for notifiers
clk: Update req_rate on __clk_recalc_rates()
clk: tests: Add missing test case for ranges
clk: qcom: clk-rcg2: Take clock boundaries into consideration for gfx3d
clk: Introduce the clk_hw_get_rate_range function
clk: Zero the clk_rate_request structure
clk: Stop forwarding clk_rate_requests to the parent
clk: Constify clk_has_parent()
clk: Introduce clk_core_has_parent()
clk: Switch from __clk_determine_rate to clk_core_round_rate_nolock
clk: Add our request boundaries in clk_core_init_rate_req
clk: Introduce clk_hw_init_rate_request()
clk: Move clk_core_init_rate_req() from clk_core_round_rate_nolock() to its caller
clk: Change clk_core_init_rate_req prototype
clk: Set req_rate on reparenting
clk: Take into account uncached clocks in clk_set_rate_range()
clk: tests: Add some tests for orphan with multiple parents
clk: tests: Add tests for mux with multiple parents
clk: tests: Add tests for single parent mux
...
Commit cb1b1dd962 ("clk: Set req_rate on reparenting") introduced a
new function, clk_core_update_orphan_child_rates(), that updates the
req_rate field on reparenting.
It turns out that that function will interfere with the clock notifying
done by __clk_recalc_rates(). This ends up reporting the new rate in
both the old_rate and new_rate fields of struct clk_notifier_data.
Since clk_core_update_orphan_child_rates() is basically
__clk_recalc_rates() without the notifiers, and with the req_rate field
update, we can drop clk_core_update_orphan_child_rates() entirely, and
make __clk_recalc_rates() update req_rate.
However, __clk_recalc_rates() is being called in several code paths:
when retrieving a rate (most likely through clk_get_rate()), when changing
parents (through clk_set_rate() or clk_hw_reparent()), or when updating
the orphan status (through clk_core_reparent_orphans_nolock(), called at
registration).
Updating req_rate on reparenting or initialisation makes sense, but we
shouldn't do it on clk_get_rate(). Thus an extra flag has been added to
update or not req_rate depending on the context.
Fixes: cb1b1dd962 ("clk: Set req_rate on reparenting")
Link: https://lore.kernel.org/linux-clk/0acc7217-762c-7c0d-45a0-55c384824ce4@samsung.com/
Link: https://lore.kernel.org/linux-clk/Y0QNSx+ZgqKSvPOC@sirena.org.uk/
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reported-by: Mark Brown <broonie@kernel.org>
Suggested-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20221010-rpi-clk-fixes-again-v1-1-d87ba82ac404@cerno.tech
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
late breaking reports that a patch series to rework clk rate range
support broke boot on some devices, so I've left that branch out of this
PR. Hopefully we can get to that next week, or punt on it and let it
bake another cycle. That means we don't really have any changes to the
core framework this time around besides a few typo fixes. Instead this
is all clk driver updates and fixes.
The usual suspects are here (again), with Qualcomm dominating the
diffstat. We look to have gained support for quite a few new Qualcomm
SoCs and Dmitry worked on updating many of the existing Qualcomm drivers
to use clk_parent_data. After that we have MediaTek drivers getting some
much needed updates, in particular to support GPU DVFS. There are also
quite a few Samsung clk driver patches, but that's mostly because there
was a maintainer change and so last release we missed some of those
patches.
Overall things look normal, but I'm slowly reviewing core framework code
nowadays and that shows given the rate range patches had to be yanked
last minute. Let's hope this situation changes soon.
New Drivers:
- Support for Renesas VersaClock7 clock generator family
- Add Spreadtrum UMS512 SoC clk support
- New clock drivers for MediaTek Helio X10 MT6795
- Display clks for Qualcomm SM6115, SM8450
- GPU clks for Qualcomm SC8280XP
- Qualcomm MSM8909 and SM6375 global and SMD RPM clk drivers
Deleted Drivers:
- Remove DaVinci DM644x and DM646x clk driver support
Updates:
- Convert Baikal-T1 CCU driver to platform driver
- Split reset support out of primary Baikal-T1 CCU driver
- Add some missing clks required for RPiVid Video Decoder on RaspberryPi
- Mark PLLC critical on bcm2835
- More devm helpers for fixed rate registration
- Various PXA168 clk driver fixes
- Add resets for MediaTek MT8195 PCIe and USB
- Miscellaneous of_node_put() fixes
- Nuke dt-bindings/clk path (again) by moving headers to dt-bindings/clock
- Convert gpio-clk-gate binding to YAML
- Various fixes to AMD/Xilinx Zynqmp clk driver
- Graduate AMD/Xilinx "clocking wizard" driver from staging
- Add missing DPI1_HDMI clock in MT8195 VDOSYS1
- Clock driver changes to support GPU DVFS on MT8183, MT8192, MT8195
- Fix GPU clock topology on MT8195
- Propogate rate changes from GPU clock gate up the tree
- Clock mux notifiers for GPU-related PLLs
- Conversion of more "simple" drivers to mtk_clk_simple_probe()
- Hook up mtk_clk_simple_remove() for "simple" MT8192 clock drivers
- Fixes to previous |struct clk| to |struct clk_hw| conversion on MediaTek
- Shrink MT8192 clock driver by deduplicating clock parent lists
- Change order between 'sim_enet_root_clk' and 'enet_qos_root_clk'
clocks for i.MX8MP
- Drop unnecessary newline in i.MX8MM dt-bindings
- Add more MU1 and SAI clocks dt-bindings Ids
- Introduce slice busy bit check for i.MX93 composite clock
- Introduce white list bit check for i.MX93 composite clock
- Add new i.MX93 clock gate
- Add MU1 and MU2 clocks to i.MX93 clock provider
- Add SAI IPG clocks to i.MX93 clock provider
- add generic clocks for U(S)ART available on SAMA5D2 SoCs
- reset controller support for Polarfire clocks
- .round_rate and .set rate support for clk-mpfs
- code cleanup for clk-mpfs
- PLL support for PolarFire SoC's Clock Conditioning Circuitry
- Add watchdog, I2C, pin control/GPIO, and Ethernet clocks on R-Car V4H
- Add SDHI, Timer (CMT/TMU), and SPI (MSIOF) clocks on R-Car S4-8
- Add I2C clocks and resets on RZ/V2M
- Document clock support for the RZ/Five SoC
- mux-variant clock using the table variant to select parents
- clock controller for the rv1126 soc
- conversion of rk3128 to yaml and relicensing of the yaml bindings
to gpl2+MIT (following dt-binding guildelines)
- Exynos7885: add FSYS, TREX and MFC clock controllers
- Exynos850: add IS and AUD (audio) clock controllers with bindings
- ExynosAutov9: add FSYS clock controllers with bindings
- ExynosAutov9: correct clock IDs in bindings of Peric 0 and 1 clock
controllers, due to duplicated entries. This is an acceptable ABI
break: recently developed/added platform so without legacies, acked
by known users/developers
- ExynosAutov9: add few missing Peric 0/1 gates
- ExynosAutov9: correct register offsets of few Peric 0/1 clocks
- Minor code improvements (use of_device_get_match_data() helper, code
style)
- Add Krzysztof Kozlowski as co-maintainer of Samsung SoC clocks, as he
already maintainers that architecture/platform
- Keep Qualcomm GDSCs enabled when PWRSTS_RET flag is there, solving retention
issues during suspend of USB on Qualcomm sc7180/sc7280 and SC8280XP
- Qualcomm SM6115 and QCM2260 are moved to reuse PLL configuration
- Qualcomm SDM660 SDCC1 moved to floor clk ops
- Support for the APCS PLLs for Qualcomm IPQ8064, IPQ8074 and IPQ6018 was
added/fixed
- The Qualcomm MSM8996 CPU clocks are updated with support for ACD
- Support for Qualcomm SDM670 GCC and RPMh clks was added
- Transition to parent_data, parent_hws and use of ARRAY_SIZE() for
num_parents was done for many Qualcomm SoCs
- Support for per-reset defined delay on Qualcomm was introduced
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Merge tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux
Pull clk updates from Stephen Boyd:
"We have some late breaking reports that a patch series to rework clk
rate range support broke boot on some devices, so I've left that
branch out of this. Hopefully we can get to that next week, or punt on
it and let it bake another cycle. That means we don't really have any
changes to the core framework this time around besides a few typo
fixes. Instead this is all clk driver updates and fixes.
The usual suspects are here (again), with Qualcomm dominating the
diffstat. We look to have gained support for quite a few new Qualcomm
SoCs and Dmitry worked on updating many of the existing Qualcomm
drivers to use clk_parent_data. After that we have MediaTek drivers
getting some much needed updates, in particular to support GPU DVFS.
There are also quite a few Samsung clk driver patches, but that's
mostly because there was a maintainer change and so last release we
missed some of those patches.
Overall things look normal, but I'm slowly reviewing core framework
code nowadays and that shows given the rate range patches had to be
yanked last minute. Let's hope this situation changes soon.
New Drivers:
- Support for Renesas VersaClock7 clock generator family
- Add Spreadtrum UMS512 SoC clk support
- New clock drivers for MediaTek Helio X10 MT6795
- Display clks for Qualcomm SM6115, SM8450
- GPU clks for Qualcomm SC8280XP
- Qualcomm MSM8909 and SM6375 global and SMD RPM clk drivers
Deleted Drivers:
- Remove DaVinci DM644x and DM646x clk driver support
Updates:
- Convert Baikal-T1 CCU driver to platform driver
- Split reset support out of primary Baikal-T1 CCU driver
- Add some missing clks required for RPiVid Video Decoder on
RaspberryPi
- Mark PLLC critical on bcm2835
- More devm helpers for fixed rate registration
- Various PXA168 clk driver fixes
- Add resets for MediaTek MT8195 PCIe and USB
- Miscellaneous of_node_put() fixes
- Nuke dt-bindings/clk path (again) by moving headers to
dt-bindings/clock
- Convert gpio-clk-gate binding to YAML
- Various fixes to AMD/Xilinx Zynqmp clk driver
- Graduate AMD/Xilinx "clocking wizard" driver from staging
- Add missing DPI1_HDMI clock in MT8195 VDOSYS1
- Clock driver changes to support GPU DVFS on MT8183, MT8192, MT8195
- Fix GPU clock topology on MT8195
- Propogate rate changes from GPU clock gate up the tree
- Clock mux notifiers for GPU-related PLLs
- Conversion of more "simple" drivers to mtk_clk_simple_probe()
- Hook up mtk_clk_simple_remove() for "simple" MT8192 clock drivers
- Fixes to previous |struct clk| to |struct clk_hw| conversion on
MediaTek
- Shrink MT8192 clock driver by deduplicating clock parent lists
- Change order between 'sim_enet_root_clk' and 'enet_qos_root_clk'
clocks for i.MX8MP
- Drop unnecessary newline in i.MX8MM dt-bindings
- Add more MU1 and SAI clocks dt-bindings Ids
- Introduce slice busy bit check for i.MX93 composite clock
- Introduce white list bit check for i.MX93 composite clock
- Add new i.MX93 clock gate
- Add MU1 and MU2 clocks to i.MX93 clock provider
- Add SAI IPG clocks to i.MX93 clock provider
- add generic clocks for U(S)ART available on SAMA5D2 SoCs
- reset controller support for Polarfire clocks
- .round_rate and .set rate support for clk-mpfs
- code cleanup for clk-mpfs
- PLL support for PolarFire SoC's Clock Conditioning Circuitry
- Add watchdog, I2C, pin control/GPIO, and Ethernet clocks on R-Car
V4H
- Add SDHI, Timer (CMT/TMU), and SPI (MSIOF) clocks on R-Car S4-8
- Add I2C clocks and resets on RZ/V2M
- Document clock support for the RZ/Five SoC
- mux-variant clock using the table variant to select parents
- clock controller for the rv1126 soc
- conversion of rk3128 to yaml and relicensing of the yaml bindings
to gpl2+MIT (following dt-binding guildelines)
- Exynos7885: add FSYS, TREX and MFC clock controllers
- Exynos850: add IS and AUD (audio) clock controllers with bindings
- ExynosAutov9: add FSYS clock controllers with bindings
- ExynosAutov9: correct clock IDs in bindings of Peric 0 and 1 clock
controllers, due to duplicated entries. This is an acceptable ABI
break: recently developed/added platform so without legacies, acked
by known users/developers
- ExynosAutov9: add few missing Peric 0/1 gates
- ExynosAutov9: correct register offsets of few Peric 0/1 clocks
- Minor code improvements (use of_device_get_match_data() helper,
code style)
- Add Krzysztof Kozlowski as co-maintainer of Samsung SoC clocks, as
he already maintainers that architecture/platform
- Keep Qualcomm GDSCs enabled when PWRSTS_RET flag is there, solving
retention issues during suspend of USB on Qualcomm sc7180/sc7280
and SC8280XP
- Qualcomm SM6115 and QCM2260 are moved to reuse PLL configuration
- Qualcomm SDM660 SDCC1 moved to floor clk ops
- Support for the APCS PLLs for Qualcomm IPQ8064, IPQ8074 and IPQ6018
was added/fixed
- The Qualcomm MSM8996 CPU clocks are updated with support for ACD
- Support for Qualcomm SDM670 GCC and RPMh clks was added
- Transition to parent_data, parent_hws and use of ARRAY_SIZE() for
num_parents was done for many Qualcomm SoCs
- Support for per-reset defined delay on Qualcomm was introduced"
* tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux: (283 commits)
clk: qcom: gcc-sm6375: Ensure unsigned long type
clk: qcom: gcc-sm6375: Remove unused variables
clk: qcom: kpss-xcc: convert to parent data API
clk: introduce (devm_)hw_register_mux_parent_data_table API
clk: allow building lan966x as a module
clk: clk-xgene: simplify if-if to if-else
clk: ast2600: BCLK comes from EPLL
clk: clocking-wizard: Depend on HAS_IOMEM
clk: clocking-wizard: Use dev_err_probe() helper
clk: nxp: fix typo in comment
clk: pxa: add a check for the return value of kzalloc()
clk: vc5: Add support for IDT/Renesas VersaClock 5P49V6975
dt-bindings: clock: vc5: Add 5P49V6975
clk: mvebu: armada-37xx-tbg: Remove the unneeded result variable
clk: ti: dra7-atl: Fix reference leak in of_dra7_atl_clk_probe
clk: Renesas versaclock7 ccf device driver
dt-bindings: Renesas versaclock7 device tree bindings
clk: ti: Balance of_node_get() calls for of_find_node_by_name()
clk: imx: scu: fix memleak on platform_device_add() fails
clk: vc5: Use regmap_{set,clear}_bits() where appropriate
...
Some clock providers are hand-crafting their clk_rate_request, and need
to figure out the current boundaries of their clk_hw to fill it
properly.
Let's create such a function for clock providers.
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220816112530.1837489-24-maxime@cerno.tech
Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
In order to make sure we don't carry anything over from an already
existing clk_rate_request pointer we would pass to
clk_core_init_rate_req(), let's zero the entire structure before
initializing it.
Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com> # imx8mp
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> # exynos4210, meson g12b
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220816112530.1837489-23-maxime@cerno.tech
Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
If the clock cannot modify its rate and has CLK_SET_RATE_PARENT,
clk_mux_determine_rate_flags(), clk_core_round_rate_nolock() and a
number of drivers will forward the clk_rate_request to the parent clock.
clk_core_round_rate_nolock() will pass the pointer directly, which means
that we pass a clk_rate_request to the parent that has the rate,
min_rate and max_rate of the child, and the best_parent_rate and
best_parent_hw fields will be relative to the child as well, so will
point to our current clock and its rate. The most common case for
CLK_SET_RATE_PARENT is that the child and parent clock rates will be
equal, so the rate field isn't a worry, but the other fields are.
Similarly, if the parent clock driver ever modifies the best_parent_rate
or best_parent_hw, this will be applied to the child once the call to
clk_core_round_rate_nolock() is done. best_parent_hw is probably not
going to be a valid parent, and best_parent_rate might lead to a parent
rate change different to the one that was initially computed.
clk_mux_determine_rate_flags() and the affected drivers will copy the
request before forwarding it to the parents, so they won't be affected
by the latter issue, but the former is still going to be there and will
lead to erroneous data and context being passed to the various clock
drivers in the same sub-tree.
Let's create two new functions, clk_core_forward_rate_req() and
clk_hw_forward_rate_request() for the framework and the clock providers
that will copy a request from a child clock and update the context to
match the parent's. We also update the relevant call sites in the
framework and drivers to use that new function.
Let's also add a test to make sure we avoid regressions there.
Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com> # imx8mp
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> # exynos4210, meson g12b
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220816112530.1837489-22-maxime@cerno.tech
Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
clk_has_parent() doesn't modify the clocks being passed, so let's make
it const.
Suggested-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220816112530.1837489-21-maxime@cerno.tech
Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
We will need to know if a clk_core pointer has a given parent in other
functions, so let's create a clk_core_has_parent() function that
clk_has_parent() will call into.
For good measure, let's add some unit tests as well to make sure it
works properly.
Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com> # imx8mp
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> # exynos4210, meson g12b
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220816112530.1837489-20-maxime@cerno.tech
Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
[sboyd@kernel.org: Move tmp declaration, fix conditional to check for
current parent]
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
clk_mux_determine_rate_flags() will call into __clk_determine_rate()
with a clk_hw pointer, while it has access to the clk_core pointer
already.
This leads to back and forth between clk_hw and clk_core, while
__clk_determine_rate will only call clk_core_round_rate_nolock() with
the clk_core pointer it retrieved from the clk_hw.
Let's simplify things a bit by calling into clk_core_round_rate_nolock
directly.
Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com> # imx8mp
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> # exynos4210, meson g12b
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220816112530.1837489-19-maxime@cerno.tech
Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
The expectation is that a new clk_rate_request is initialized through a
call to clk_core_init_rate_req().
However, at the moment it only fills the parent rate and clk_hw pointer,
but omits the other fields such as the clock rate boundaries.
Some users of that function will update them after calling it, but most
don't.
As we are passed the clk_core pointer, we have access to those
boundaries in clk_core_init_rate_req() however, so let's just fill it
there and remove it from the few callers that do it right.
Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com> # imx8mp
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> # exynos4210, meson g12b
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220816112530.1837489-18-maxime@cerno.tech
Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
clk-divider instantiates clk_rate_request internally for its round_rate
implementations to share the code with its determine_rate
implementations.
However, it's missing a few fields (min_rate, max_rate) that would be
initialized properly if it was using clk_core_init_rate_req().
Let's create the clk_hw_init_rate_request() function for clock providers
to be able to share the code to instation clk_rate_requests with the
framework. This will also be useful for some tests introduced in later
patches.
Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com> # imx8mp
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> # exynos4210, meson g12b
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220816112530.1837489-17-maxime@cerno.tech
Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
The clk_rate_request structure is used internally as an argument for
the clk_core_determine_round_nolock() and clk_core_round_rate_nolock().
In both cases, the clk_core_init_rate_req() function is used to
initialize the clk_rate_request structure.
However, the expectation on who gets to call that function is
inconsistent between those two functions. Indeed,
clk_core_determine_round_nolock() will assume the structure is properly
initialized and will just use it.
On the other hand, clk_core_round_rate_nolock() will call
clk_core_init_rate_req() itself, expecting the caller to have filled
only a minimal set of parameters (rate, min_rate and max_rate).
If we ignore the calling convention inconsistency, this leads to a
second inconsistency for drivers:
* If they get called by the framework through
clk_core_round_rate_nolock(), the rate, min_rate and max_rate
fields will be filled by the caller, and the best_parent_rate and
best_parent_hw fields will get filled by clk_core_init_rate_req().
* If they get called by a driver through __clk_determine_rate (and
thus clk_core_round_rate_nolock), only best_parent_rate and
best_parent_hw are being explicitly set by the framework. Even
though we can reasonably expect rate to be set, only one of the 6
in-tree users explicitly set min_rate and max_rate.
* If they get called by the framework through
clk_core_determine_round_nolock(), then we have two callpaths.
Either it will be called by clk_core_round_rate_nolock() itself, or
it will be called by clk_calc_new_rates(), which will properly
initialize rate, min_rate, max_rate itself, and best_parent_rate
and best_parent_hw through clk_core_init_rate_req().
Even though the first and third case seems equivalent, they aren't when
the clock has CLK_SET_RATE_PARENT. Indeed, in such a case
clk_core_round_rate_nolock() will call itself on the current parent
clock with the same clk_rate_request structure.
The clk_core_init_rate_req() function will then be called on the parent
clock, with the child clk_rate_request pointer and will fill the
best_parent_rate and best_parent_hw fields with the parent context.
When the whole recursion stops and the call returns, the initial caller
will end up with a clk_rate_request structure with some information of
the child clock (rate, min_rate, max_rate) and some others of the last
clock up the tree whose child had CLK_SET_RATE_PARENT (best_parent_hw,
best_parent_rate).
In the most common case, best_parent_rate is going to be equal on all
the parent clocks so it's not a big deal. However, best_parent_hw is
going to point to a clock that never has been a valid parent for that
clock which is definitely confusing.
In order to fix the calling inconsistency, let's move the
clk_core_init_rate_req() calls to the callers, which will also help a
bit with the clk_core_round_rate_nolock() recursion.
Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com> # imx8mp
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> # exynos4210, meson g12b
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220816112530.1837489-16-maxime@cerno.tech
Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
The expectation is that a clk_rate_request structure is supposed to be
initialized using clk_core_init_rate_req(), yet the rate we want to
request still needs to be set by hand.
Let's just pass the rate as a function argument so that callers don't
have any extra work to do.
Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com> # imx8mp
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> # exynos4210, meson g12b
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220816112530.1837489-15-maxime@cerno.tech
Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
If a non-rate clock started by default with a parent that never
registered, core->req_rate will be 0. The expectation is that whenever
the parent will be registered, req_rate will be updated with the new
value that has just been computed.
However, if that clock is a mux, clk_set_parent() can also make that
clock no longer orphan. In this case however, we never update req_rate.
The natural solution to this would be to update core->rate and
core->req_rate in clk_reparent() by calling clk_recalc().
However, this doesn't work in all cases. Indeed, clk_recalc() is called
by __clk_set_parent_before(), __clk_set_parent() and
clk_core_reparent(). Both __clk_set_parent_before() and __clk_set_parent
will call clk_recalc() with the enable_lock taken through a call to
clk_enable_lock(), the underlying locking primitive being a spinlock.
clk_recalc() calls the backing driver .recalc_rate hook, and that
implementation might sleep if the underlying device uses a bus with
accesses that might sleep, such as i2c.
In such a situation, we would end up sleeping while holding a spinlock,
and thus in an atomic section.
In order to work around this, we can move the core->rate and
core->req_rate update to the clk_recalc() calling sites, after the
enable_lock has been released if it was taken.
The only situation that could still be problematic is the
clk_core_reparent() -> clk_reparent() case that doesn't have any
locking. clk_core_reparent() is itself called by clk_hw_reparent(),
which is then called by 4 drivers:
* clk-stm32mp1.c, stm32/clk-stm32-core.c and tegra/clk-tegra210-emc.c
use it in their set_parent implementation. The set_parent hook is
only called by __clk_set_parent() and clk_change_rate(), both of
them calling it without the enable_lock taken.
* clk/tegra/clk-tegra124-emc.c calls it as part of its set_rate
implementation. set_rate is only called by clk_change_rate(), again
without the enable_lock taken.
In both cases we can't end up in a situation where the clk_hw_reparent()
caller would hold a spinlock, so it seems like this is a good
workaround.
Let's also add some unit tests to make sure we cover the original bug.
Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com> # imx8mp
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> # exynos4210, meson g12b
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220816112530.1837489-14-maxime@cerno.tech
Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
clk_set_rate_range() will use the last requested rate for the clock when
it calls into the driver set_rate hook.
However, if CLK_GET_RATE_NOCACHE is set on that clock, the last
requested rate might not be matching the current rate of the clock. In
such a case, let's read out the rate from the hardware and use that in
our set_rate instead.
Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com> # imx8mp
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> # exynos4210, meson g12b
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220816112530.1837489-13-maxime@cerno.tech
Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
As shown by a number of clock users already, clk_get_rate() can be
called whether or not the clock is enabled.
Similarly, a number of clock drivers will return a rate of 0 whenever
the rate cannot be figured out.
Since it was a bit ambiguous before, let's make it clear in the
clk_get_rate() documentation.
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220816112530.1837489-6-maxime@cerno.tech
Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Commit 948fb0969e ("clk: Always clamp the rounded rate") recently
started to clamp the request rate in the clk_rate_request passed as an
argument of clk_core_determine_round_nolock() with the min_rate and
max_rate fields of that same request.
While the clk_rate_requests created by the framework itself always have
those fields set, some drivers will create it themselves and don't
always fill min_rate and max_rate.
In such a case, we end up clamping the rate with a minimum and maximum
of 0, thus always rounding the rate to 0.
Let's skip the clamping if both min_rate and max_rate are set to 0 and
complain so that it gets fixed.
Fixes: 948fb0969e ("clk: Always clamp the rounded rate")
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220816112530.1837489-4-maxime@cerno.tech
Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
When clk_put() is called we don't make another clk_set_rate() call to
re-evaluate the rate boundaries. This is unlike clk_set_rate_range()
that evaluates the rate again each time it is called.
However, clk_put() is essentially equivalent to clk_set_rate_range()
since after clk_put() completes the consumer's boundaries shouldn't be
enforced anymore.
Let's add a call to clk_set_rate_range() in clk_put() to make sure those
rate boundaries are dropped and the clock provider drivers can react. In
order to be as non-intrusive as possible, we'll just make that call if
the clock had non-default boundaries.
Also add a few tests to make sure this case is covered.
Fixes: c80ac50cbb ("clk: Always set the rate on clk_set_range_rate")
Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com> # imx8mp
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> # exynos4210, meson g12b
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220816112530.1837489-3-maxime@cerno.tech
Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
In the original commit 9a34b45397 ("clk: Add support for runtime PM"),
the commit message mentioned that pm_runtime_put_sync() would be done
at the end of clk_core_unprepare(). This mirrors the operations in
clk_core_prepare() in the opposite order.
However, the actual code that was added wasn't in the order the commit
message described. Move clk_pm_runtime_put() to the end of
clk_core_unprepare() so that it is in the correct order.
Fixes: 9a34b45397 ("clk: Add support for runtime PM")
Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Link: https://lore.kernel.org/r/20220822081424.1310926-3-wenst@chromium.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
In the previous commits that added CLK_OPS_PARENT_ENABLE, support for
this flag was only added to rate change operations (rate setting and
reparent) and disabling unused subtree. It was not added to the
clock gate related operations. Any hardware driver that needs it for
these operations will either see bogus results, or worse, hang.
This has been seen on MT8192 and MT8195, where the imp_ii2_* clk
drivers set this, but dumping debugfs clk_summary would cause it
to hang.
Fixes: fc8726a2c0 ("clk: core: support clocks which requires parents enable (part 2)")
Fixes: a4b3518d14 ("clk: core: support clocks which requires parents enable (part 1)")
Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Tested-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Link: https://lore.kernel.org/r/20220822081424.1310926-2-wenst@chromium.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
For the entire history of the devm_clk_*unregister() existence they were
used only once (*) in 2015. Remove them.
*) The commit 264e3b75de ("clk: s2mps11: Simplify s2mps11_clk_probe unwind
paths") exactly supports the point of the change proposed here.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20220622171147.85603-1-andriy.shevchenko@linux.intel.com
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Using pm_runtime_resume_and_get is more appropriate
for simplifing code
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Minghao Chi <chi.minghao@zte.com.cn>
Link: https://lore.kernel.org/r/20220418110455.2559264-1-chi.minghao@zte.com.cn
[sboyd@kernel.org: Drop local ret variable too]
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
This reverts commit 7dabfa2bc4. There are
multiple reports that this breaks boot on various systems. The common
theme is that orphan clks are having rates set on them when that isn't
expected. Let's revert it out for now so that -rc1 boots.
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reported-by: Tony Lindgren <tony@atomide.com>
Reported-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Link: https://lore.kernel.org/r/366a0232-bb4a-c357-6aa8-636e398e05eb@samsung.com
Cc: Maxime Ripard <maxime@cerno.tech>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20220403022818.39572-1-sboyd@kernel.org
- Make clk_set_rate_range() re-evaluate the limits each time
- Introduce various clk_set_rate_range() tests
- Add clk_drop_range() to drop a previously set range
- Support for NCO blocks on Apple SoCs
* clk-range:
clk: Drop the rate range on clk_put()
clk: test: Test clk_set_rate_range on orphan mux
clk: Initialize orphan req_rate
clk: bcm: rpi: Run some clocks at the minimum rate allowed
clk: bcm: rpi: Set a default minimum rate
clk: bcm: rpi: Add variant structure
clk: Add clk_drop_range
clk: Always set the rate on clk_set_range_rate
clk: Use clamp instead of open-coding our own
clk: Always clamp the rounded rate
clk: Enforce that disjoints limits are invalid
clk: Introduce Kunit Tests for the framework
clk: Fix clk_hw_get_clk() when dev is NULL
* clk-uniphier:
clk: uniphier: Fix fixed-rate initialization
* clk-apple:
clk: clk-apple-nco: Allow and fix module building
MAINTAINERS: Add clk-apple-nco under ARM/APPLE MACHINE
clk: clk-apple-nco: Add driver for Apple NCO
dt-bindings: clock: Add Apple NCO
* clk-qcom: (61 commits)
clk: qcom: gcc-msm8994: Fix gpll4 width
dt-bindings: clock: fix dt_binding_check error for qcom,gcc-other.yaml
clk: qcom: Add display clock controller driver for SM6125
dt-bindings: clock: add QCOM SM6125 display clock bindings
clk: qcom: Fix sorting of SDX_GCC_65 in Makefile and Kconfig
clk: qcom: gcc: Add emac GDSC support for SM8150
clk: qcom: gcc: sm8150: Fix some identation issues
clk: qcom: gcc: Add UFS_CARD and UFS_PHY GDSCs for SM8150
clk: qcom: gcc: Add PCIe0 and PCIe1 GDSC for SM8150
clk: qcom: clk-rcg2: Update the frac table for pixel clock
clk: qcom: clk-rcg2: Update logic to calculate D value for RCG
clk: qcom: smd: Add missing MSM8998 RPM clocks
clk: qcom: smd: Add missing RPM clocks for msm8992/4
dt-bindings: clock: qcom: rpmcc: Add RPM Modem SubSystem (MSS) clocks
clk: qcom: gcc-ipq806x: add CryptoEngine resets
dt-bindings: reset: add ipq8064 ce5 resets
clk: qcom: gcc-ipq806x: add CryptoEngine clocks
dt-bindings: clock: add ipq8064 ce5 clk define
clk: qcom: gcc-ipq806x: add additional freq for sdc table
clk: qcom: clk-rcg: add clk_rcg_floor_ops ops
...
When clk_put() is called we don't make another clk_set_rate() call to
re-evaluate the rate boundaries. This is unlike clk_set_rate_range()
that evaluates the rate again each time it is called.
However, clk_put() is essentially equivalent to clk_set_rate_range()
since after clk_put() completes the consumer's boundaries shouldn't be
enforced anymore.
Let's add a call to clk_set_rate_range() in clk_put() to make sure those
rate boundaries are dropped and the clock provider drivers can react.
Also add a few tests to make sure this case is covered.
Fixes: c80ac50cbb ("clk: Always set the rate on clk_set_range_rate")
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220325161144.1901695-4-maxime@cerno.tech
[sboyd@kernel.org: Reword commit text]
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
When registering a clock that doesn't have a recalc_rate implementation,
and doesn't have its parent registered yet, we initialize the clk_core
rate and 'req_rate' fields to 0.
The rate field is later updated when the parent is registered in
clk_core_reparent_orphans_nolock() using __clk_recalc_rates(), but the
'req_rate' field is never updated.
This leads to an issue in clk_set_rate_range() and clk_put(), since
those functions will call clk_set_rate() with the content of 'req_rate'
to provide drivers with the opportunity to change the rate based on the
new boundaries. In this case, we would call clk_set_rate() with a rate
of 0, effectively enforcing the minimum allowed for this clock whenever
we would call one of those two functions, even though the actual rate
might be within range.
Let's fix this by setting 'req_rate' in
clk_core_reparent_orphans_nolock() with the rate field content just
updated by the call to __clk_recalc_rates().
Fixes: 1c8e600440 ("clk: Add rate constraints to clocks")
Reported-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Tested-by: Dmitry Osipenko <dmitry.osipenko@collabora.com> # T30 Nexus7
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220325161144.1901695-2-maxime@cerno.tech
[sboyd@kernel.org: Reword comment]
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
When we change a clock minimum or maximum using clk_set_rate_range(),
clk_set_min_rate() or clk_set_max_rate(), the current code will only
trigger a new rate change if the rate is outside of the new boundaries.
However, a clock driver might want to always keep the clock rate to
one of its boundary, for example the minimum to keep the power
consumption as low as possible.
Since they don't always get called though, clock providers don't have the
opportunity to implement this behaviour.
Let's trigger a clk_set_rate() on the previous requested rate every time
clk_set_rate_range() is called. That way, providers that care about the
new boundaries have a chance to adjust the rate, while providers that
don't care about those new boundaries will return the same rate than
before, which will be ignored by clk_set_rate() and won't result in a
new rate change.
Suggested-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220225143534.405820-7-maxime@cerno.tech
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
The code in clk_set_rate_range() will, if the current rate is outside of
the new range, force it to the minimum or maximum.
Since it's running under the condition that the rate is either lower
than the minimum, or higher than the maximum, this is equivalent to
using clamp, while being less readable. Let's switch to using clamp
instead.
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220225143534.405820-6-maxime@cerno.tech
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
The current core while setting the min and max rate properly in the
clk_request structure will not make sure that the requested rate is
within these boundaries, leaving it to each and every driver to make
sure it is.
It's not clear if this was on purpose or not, but this introduces some
inconsistencies within the API.
For example, a user setting a range and then calling clk_round_rate()
with a value outside of that range will get the same value back
(ignoring any driver adjustements), effectively ignoring the range that
was just set.
Another one, arguably worse, is that it also makes clk_round_rate() and
clk_set_rate() behave differently if there's a range and the rate being
used for both is outside that range. As we have seen, the rate will be
returned unchanged by clk_round_rate(), but clk_set_rate() will error
out returning -EINVAL.
Let's make sure the framework will always clamp the rate to the current
range found on the clock, which will fix both these inconsistencies.
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220225143534.405820-5-maxime@cerno.tech
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
If we were to have two users of the same clock, doing something like:
clk_set_rate_range(user1, 1000, 2000);
clk_set_rate_range(user2, 3000, 4000);
The second call would fail with -EINVAL, preventing from getting in a
situation where we end up with impossible limits.
However, this is never explicitly checked against and enforced, and
works by relying on an undocumented behaviour of clk_set_rate().
Indeed, on the first clk_set_rate_range will make sure the current clock
rate is within the new range, so it will be between 1000 and 2000Hz. On
the second clk_set_rate_range(), it will consider (rightfully), that our
current clock is outside of the 3000-4000Hz range, and will call
clk_core_set_rate_nolock() to set it to 3000Hz.
clk_core_set_rate_nolock() will then call clk_calc_new_rates() that will
eventually check that our rate 3000Hz rate is outside the min 3000Hz max
2000Hz range, will bail out, the error will propagate and we'll
eventually return -EINVAL.
This solely relies on the fact that clk_calc_new_rates(), and in
particular clk_core_determine_round_nolock(), won't modify the new rate
allowing the error to be reported. That assumption won't be true for all
drivers, and most importantly we'll break that assumption in a later
patch.
It can also be argued that we shouldn't even reach the point where we're
calling clk_core_set_rate_nolock().
Let's make an explicit check for disjoints range before we're doing
anything.
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220225143534.405820-4-maxime@cerno.tech
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Any registered clk_core structure can have a NULL pointer in its dev
field. While never actually documented, this is evidenced by the wide
usage of clk_register and clk_hw_register with a NULL device pointer,
and the fact that the core of_clk_hw_register() function also passes a
NULL device pointer.
A call to clk_hw_get_clk() on a clk_hw struct whose clk_core is in that
case will result in a NULL pointer derefence when it calls dev_name() on
that NULL device pointer.
Add a test for this case and use NULL as the dev_id if the device
pointer is NULL.
Fixes: 30d6f8c15d ("clk: add api to get clk consumer from clk_hw")
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220225143534.405820-2-maxime@cerno.tech
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
