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b455dc3510
linux/drivers/clk/qcom
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Jorge Ramirez-Ortiz b455dc3510 clk: qcom: hfpll: CLK_IGNORE_UNUSED 
When COMMON_CLK_DISABLED_UNUSED is set, in an effort to save power and
to keep the software model of the clock in line with reality, the
framework transverses the clock tree and disables those clocks that
were enabled by the firmware but have not been enabled by any device
driver.

If CPUFREQ is enabled, early during the system boot, it might attempt
to change the CPU frequency ("set_rate"). If the HFPLL is selected as
a provider, it will then change the rate for this clock.

As boot continues, clk_disable_unused_subtree will run. Since it wont
find a valid counter (enable_count) for a clock that is actually
enabled it will attempt to disable it which will cause the CPU to
stop. Notice that in this driver, calls to check whether the clock is
enabled are routed via the is_enabled callback which queries the
hardware.

The following commit, rather than marking the clock critical and
forcing the clock to be always enabled, addresses the above scenario
making sure the clock is not disabled but it continues to rely on the
firmware to enable the clock.

Co-developed-by: Niklas Cassel <niklas.cassel@linaro.org>
Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>
Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lkml.kernel.org/r/20191125135910.679310-5-niklas.cassel@linaro.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2019-12-18 22:07:52 -08:00
..
a53-pll.c clk: qcom: Add A53 PLL support 2018-01-02 10:00:24 -08:00
apcs-msm8916.c clk: apcs-msm8916: simplify probe cleanup by using devm 2018-12-05 09:22:33 -08:00
camcc-sdm845.c clk: qcom: Add camera clock controller driver for SDM845 2018-08-30 18:27:06 -07:00
clk-alpha-pll.c clk: qcom: gcc: limit GPLL0_AO_OUT operating frequency 2019-12-18 22:07:52 -08:00
clk-alpha-pll.h clk: qcom: gcc: limit GPLL0_AO_OUT operating frequency 2019-12-18 22:07:52 -08:00
clk-branch.c clk: qcom: branch: Add AON clock ops 2019-04-11 13:34:21 -07:00
clk-branch.h clk: qcom: branch: Add AON clock ops 2019-04-11 13:34:21 -07:00
clk-hfpll.c clk: qcom: Add support for High-Frequency PLLs (HFPLLs) 2018-10-17 13:14:37 -07:00
clk-hfpll.h clk: qcom: Add support for High-Frequency PLLs (HFPLLs) 2018-10-17 13:14:37 -07:00
clk-krait.c clk: qcom: Add safe switch hook for krait mux clocks 2018-10-17 13:15:05 -07:00
clk-krait.h clk: qcom: Add safe switch hook for krait mux clocks 2018-10-17 13:15:05 -07:00
clk-pll.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
clk-pll.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
clk-rcg2.c clk: qcom: rcg2: Add support for display port clock ops 2019-12-18 21:22:00 -08:00
clk-rcg.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
clk-rcg.h clk: qcom: rcg2: Add support for display port clock ops 2019-12-18 21:22:00 -08:00
clk-regmap-divider.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
clk-regmap-divider.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
clk-regmap-mux-div.c clk: qcom: Add regmap mux-div clocks support 2018-01-02 10:00:24 -08:00
clk-regmap-mux-div.h clk: qcom: Use the correct style for SPDX License Identifier 2019-05-01 13:01:13 -07:00
clk-regmap-mux.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
clk-regmap-mux.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
clk-regmap.c clk: qcom: Update SPDX headers for common files 2018-07-25 09:23:33 -07:00
clk-regmap.h clk: qcom: Update SPDX headers for common files 2018-07-25 09:23:33 -07:00
clk-rpm.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
clk-rpmh.c Merge branch 'thermal/next' of git://git.kernel.org/pub/scm/linux/kernel/git/thermal/linux 2019-12-05 11:21:24 -08:00
clk-smd-rpm.c clk: qcom: smd: Add missing bimc clock 2019-12-18 22:03:02 -08:00
clk-spmi-pmic-div.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 284 2019-06-05 17:36:37 +02:00
common.c clk: qcom: Allow constant ratio freq tables for rcg 2019-11-07 13:43:19 -08:00
common.h clk: qcom: define probe by index API as common API 2019-08-08 08:20:01 -07:00
dispcc-sdm845.c clk: qcom: dispcc: Add support for display port clocks 2019-12-18 21:24:13 -08:00
gcc-apq8084.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
gcc-ipq806x.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
gcc-ipq4019.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
gcc-ipq8074.c clk: qcom: gcc: Use floor ops for SDCC clocks 2019-09-09 04:39:12 -07:00
gcc-mdm9615.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
gcc-msm8660.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
gcc-msm8916.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
gcc-msm8960.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
gcc-msm8974.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
gcc-msm8994.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 284 2019-06-05 17:36:37 +02:00
gcc-msm8996.c This round of clk driver and framework updates is heavy on the driver update 2019-07-17 10:07:48 -07:00
gcc-msm8998.c clk: qcom: Enumerate clocks and reset needed to boot the 8998 modem 2019-11-07 13:41:40 -08:00
gcc-qcs404.c clk: qcom: gcc: limit GPLL0_AO_OUT operating frequency 2019-12-18 22:07:52 -08:00
gcc-sc7180.c clk: qcom: Add Global Clock controller (GCC) driver for SC7180 2019-11-07 13:16:01 -08:00
gcc-sdm660.c clk: qcom: gcc: Use floor ops for SDCC clocks 2019-09-09 04:39:12 -07:00
gcc-sdm845.c Merge branch 'thermal/next' of git://git.kernel.org/pub/scm/linux/kernel/git/thermal/linux 2019-12-05 11:21:24 -08:00
gcc-sm8150.c clk: qcom: gcc: Use floor ops for SDCC clocks 2019-09-09 04:39:12 -07:00
gdsc.c This round of clk driver and framework updates is heavy on the driver update 2019-07-17 10:07:48 -07:00
gdsc.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 284 2019-06-05 17:36:37 +02:00
gpucc-msm8998.c clk: qcom: Add MSM8998 GPU Clock Controller (GPUCC) driver 2019-11-07 13:43:19 -08:00
gpucc-sdm845.c clk: qcom: gpu_cc_gmu_clk_src has 5 parents, not 6 2018-11-28 13:24:45 -08:00
hfpll.c clk: qcom: hfpll: CLK_IGNORE_UNUSED 2019-12-18 22:07:52 -08:00
Kconfig clk: qcom: Add MSM8998 Multimedia Clock Controller (MMCC) driver 2019-12-18 21:37:40 -08:00
kpss-xcc.c clk: qcom: Add KPSS ACC/GCC driver 2018-10-17 13:14:54 -07:00
krait-cc.c clk: qcom: Add safe switch hook for krait mux clocks 2018-10-17 13:15:05 -07:00
lcc-ipq806x.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
lcc-mdm9615.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
lcc-msm8960.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
lpasscc-sdm845.c clk: qcom: define probe by index API as common API 2019-08-08 08:20:01 -07:00
Makefile clk: qcom: Add MSM8998 Multimedia Clock Controller (MMCC) driver 2019-12-18 21:37:40 -08:00
mmcc-apq8084.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
mmcc-msm8960.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
mmcc-msm8974.c clk: qcom: mmcc8974: move gfx3d_clk_src from the mmcc to rpm 2019-12-18 21:27:44 -08:00
mmcc-msm8996.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
mmcc-msm8998.c clk: qcom: Add MSM8998 Multimedia Clock Controller (MMCC) driver 2019-12-18 21:37:40 -08:00
q6sstop-qcs404.c clk: qcom: Add Q6SSTOP clock controller for QCS404 2019-11-07 13:10:36 -08:00
reset.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
reset.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
turingcc-qcs404.c clk: qcom: fix QCS404 TuringCC regmap 2019-09-09 09:05:22 -07:00
videocc-sdm845.c clk: qcom: Move frequency table macro to common file 2018-07-06 16:45:51 -07:00