According to the SDIO standard interrupts are normally signalled in a
very complicated way. They require the card clock to be running and
require the controller to be paying close attention to the signals
coming from the card. This simply can't happen with the clock stopped
or with the controller in a low power mode.
To that end, we'll disable runtime_pm when we detect that an SDIO card
was inserted. This is much like with what we do with the special
"SDMMC_CLKEN_LOW_PWR" bit that dw_mmc supports.
NOTE: we specifically do this Runtime PM disabling at card init time
rather than in the enable_sdio_irq() callback. This is _different_
than how SDHCI does it. Why do we do it differently?
- Unlike SDHCI, dw_mmc uses the standard sdio_irq code in Linux (AKA
dw_mmc doesn't set MMC_CAP2_SDIO_IRQ_NOTHREAD).
- Because we use the standard sdio_irq code:
- We see a constant stream of enable_sdio_irq(0) and
enable_sdio_irq(1) calls. This is because the standard code
disables interrupts while processing and re-enables them after.
- While interrupts are disabled, there's technically a period where
we could get runtime disabled while processing interrupts.
- If we are runtime disabled while processing interrupts, we'll
reset the controller at resume time (see dw_mci_runtime_resume),
which seems like a terrible idea because we could possibly have
another interrupt pending.
To fix the above isues we'd want to put something in the standard
sdio_irq code that makes sure to call pm_runtime get/put when
interrupts are being actively being processed. That's possible to do,
but it seems like a more complicated mechanism when we really just
want the runtime pm disabled always for SDIO cards given that all the
other bits needed to get Runtime PM vs. SDIO just aren't there.
NOTE: at some point in time someone might come up with a fancy way to
do SDIO interrupts and still allow (some) amount of runtime PM.
Technically we could turn off the card clock if we used an alternate
way of signaling SDIO interrupts (and out of band interrupt is one way
to do this). We probably wouldn't actually want to fully runtime
suspend in this case though--at least not with the current
dw_mci_runtime_resume() which basically fully resets the controller at
resume time.
Fixes: e9ed8835e9 ("mmc: dw_mmc: add runtime PM callback")
Cc: <stable@vger.kernel.org>
Reported-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Certain 64-bit systems (e.g. Amlogic Meson GX) require buffers to be
used for DMA to be 8-byte-aligned. struct sdio_func has an embedded
small DMA buffer not meeting this requirement.
When testing switching to descriptor chain mode in meson-gx driver
SDIO is broken therefore. Fix this by allocating the small DMA buffer
separately as kmalloc ensures that the returned memory area is
properly aligned for every basic data type.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Tested-by: Helmut Klein <hgkr.klein@gmail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
The controller has different timings for MMC_TIMING_UHS_DDR50 and
MMC_TIMING_MMC_DDR52. Configuring the controller with SDHCI_CTRL_UHS_DDR50,
when MMC_TIMING_MMC_DDR52 timings are requested, is not correct and can
lead to unexpected behavior.
Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Fixes: bb5f8ea4d5 ("mmc: sdhci-of-at91: introduce driver for the Atmel SDMMC")
Cc: <stable@vger.kernel.org> # 4.4+
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
SDIO cards may need clock to send the card interrupt to the host.
On a cherrytrail tablet with a RTL8723BS wifi chip, without this patch
pinging the tablet results in:
PING 192.168.1.14 (192.168.1.14) 56(84) bytes of data.
64 bytes from 192.168.1.14: icmp_seq=1 ttl=64 time=78.6 ms
64 bytes from 192.168.1.14: icmp_seq=2 ttl=64 time=1760 ms
64 bytes from 192.168.1.14: icmp_seq=3 ttl=64 time=753 ms
64 bytes from 192.168.1.14: icmp_seq=4 ttl=64 time=3.88 ms
64 bytes from 192.168.1.14: icmp_seq=5 ttl=64 time=795 ms
64 bytes from 192.168.1.14: icmp_seq=6 ttl=64 time=1841 ms
64 bytes from 192.168.1.14: icmp_seq=7 ttl=64 time=810 ms
64 bytes from 192.168.1.14: icmp_seq=8 ttl=64 time=1860 ms
64 bytes from 192.168.1.14: icmp_seq=9 ttl=64 time=812 ms
64 bytes from 192.168.1.14: icmp_seq=10 ttl=64 time=48.6 ms
Where as with this patch I get:
PING 192.168.1.14 (192.168.1.14) 56(84) bytes of data.
64 bytes from 192.168.1.14: icmp_seq=1 ttl=64 time=3.96 ms
64 bytes from 192.168.1.14: icmp_seq=2 ttl=64 time=1.97 ms
64 bytes from 192.168.1.14: icmp_seq=3 ttl=64 time=17.2 ms
64 bytes from 192.168.1.14: icmp_seq=4 ttl=64 time=2.46 ms
64 bytes from 192.168.1.14: icmp_seq=5 ttl=64 time=2.83 ms
64 bytes from 192.168.1.14: icmp_seq=6 ttl=64 time=1.40 ms
64 bytes from 192.168.1.14: icmp_seq=7 ttl=64 time=2.10 ms
64 bytes from 192.168.1.14: icmp_seq=8 ttl=64 time=1.40 ms
64 bytes from 192.168.1.14: icmp_seq=9 ttl=64 time=2.04 ms
64 bytes from 192.168.1.14: icmp_seq=10 ttl=64 time=1.40 ms
Cc: Dong Aisheng <b29396@freescale.com>
Cc: Ian W MORRISON <ianwmorrison@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Dong Aisheng <aisheng.dong@nxp.com>
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Disabling interrupts for even a millisecond can cause problems for some
devices. That can happen when Intel host controllers wait for the present
state to propagate.
The spin lock is not necessary here. Anything that is racing with changes
to the I/O state is already broken. The mmc core already provides
synchronization via "claiming" the host.
Although the spin lock probably should be removed from the code paths that
lead to this point, such a patch would touch too much code to be suitable
for stable trees. Consequently, for this patch, just drop the spin lock
while waiting.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org # v4.9+
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Disabling interrupts for even a millisecond can cause problems for some
devices. That can happen when sdhci changes clock frequency because it
waits for the clock to become stable under a spin lock.
The spin lock is not necessary here. Anything that is racing with changes
to the I/O state is already broken. The mmc core already provides
synchronization via "claiming" the host.
Although the spin lock probably should be removed from the code paths that
lead to this point, such a patch would touch too much code to be suitable
for stable trees. Consequently, for this patch, just drop the spin lock
while waiting.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Make sure to check the number of endpoints to avoid dereferencing a
NULL-pointer should a malicious device lack endpoints.
Fixes: 53f3a9e26e ("mmc: USB SD Host Controller (USHC) driver")
Cc: stable <stable@vger.kernel.org> # 2.6.37
Cc: David Vrabel <david.vrabel@csr.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
The SDHCI controller in the SAMA5D2 chip requires a valid voltage set
in the power control register, otherwise commands will fail with a
timeout error.
When using the regulator framework to specify the regulator used by the
mmc device, the voltage is not configured, and it is not possible to use
the connected device.
Implement a custom 'set_power' function for this specific hardware, that
configures the voltage in the register in all cases.
Signed-off-by: Romain Izard <romain.izard.pro@gmail.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Cc: stable@vger.kernel.org #4.9+
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Fix compilation warning:
drivers/mmc/core/block.c:1563:24: warning: variable ‘mq_rq’ set but not
used [-Wunused-but-set-variable] struct mmc_queue_req *mq_rq;
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This patch can fix two issues:
Issue 1:
In previous code, div may be overflow when setting clock frequency
as f_min. We can use DIV_ROUND_UP to fix this boundary related
issue.
Issue 2:
In previous code, we can not set the correct clock frequency when
div equals 0xff.
Signed-off-by: Yong Mao <yong.mao@mediatek.com>
Signed-off-by: Chaotian Jing <chaotian.jing@mediatek.com>
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Commit 4e1f780032 ("mmc: block: break out mmc_blk_rw_cmd_abort()")
assumed the request had not completed, but in one case it had. Fix that.
Fixes: 4e1f780032 ("mmc: block: break out mmc_blk_rw_cmd_abort()")
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Commit 1552011150 ("mmc: core: Further fix thread wake-up") allowed a
queue to release the host with is_waiting_last_req set to true. A queue
waiting to claim the host will not reset it, which can result in the
queue getting stuck in a loop.
Fixes: 1552011150 ("mmc: core: Further fix thread wake-up")
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org # v4.10+
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
HS400-ES devices fail to initialize with the following error messages.
mmc1: power class selection to bus width 8 ddr 0 failed
mmc1: error -110 whilst initialising MMC card
This was seen on Samsung Chromebook Plus. Code analysis points to
commit 3d4ef32975 ("mmc: core: fix multi-bit bus width without
high-speed mode"), which attempts to set the bus width for all but
HS200 devices unconditionally. However, for HS400-ES, the bus width
is already selected.
Cc: Anssi Hannula <anssi.hannula@bitwise.fi>
Cc: Douglas Anderson <dianders@chromium.org>
Cc: Brian Norris <briannorris@chromium.org>
Fixes: 3d4ef32975 ("mmc: core: fix multi-bit bus width ...")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Shawn Lin <shawn.lin@rock-chip.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
sdhci_arasan_get_timeout_clock() divides the frequency it has with (1 <<
(13 + divisor)).
However, the divisor is not some Arasan-specific value, but instead is
just the Data Timeout Counter Value from the SDHCI Timeout Control
Register.
Applying it here like this is wrong as the sdhci driver already takes
that value into account when calculating timeouts, and in fact it *sets*
that register value based on how long a timeout is wanted.
Additionally, sdhci core interprets the .get_timeout_clock callback
return value as if it were read from hardware registers, i.e. the unit
should be kHz or MHz depending on SDHCI_TIMEOUT_CLK_UNIT capability bit.
This bit is set at least on the tested Zynq-7000 SoC.
With the tested hardware (SDHCI_TIMEOUT_CLK_UNIT set) this results in
too high a timeout clock rate being reported, causing the core to use
longer-than-needed timeouts. Additionally, on a partitioned MMC
(therefore having erase_group_def bit set) mmc_calc_max_discard()
disables discard support as it looks like controller does not support
the long timeouts needed for that.
Do not apply the extra divisor and return the timeout clock in the
expected unit.
Tested with a Zynq-7000 SoC and a partitioned Toshiba THGBMAG5A1JBAWR
eMMC card.
Signed-off-by: Anssi Hannula <anssi.hannula@bitwise.fi>
Fixes: e3ec3a3d11 ("mmc: arasan: Add driver for Arasan SDHCI")
Cc: <stable@vger.kernel.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
We are going to move scheduler ABI details to <uapi/linux/sched/types.h>,
which will be used from a number of .c files.
Create empty placeholder header that maps to <linux/types.h>.
Include the new header in the files that are going to need it.
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Fix typos and add the following to the scripts/spelling.txt:
intialization||initialization
The "inintialization" in drivers/acpi/spcr.c is a different pattern but
I fixed it as well in this commit.
Link: http://lkml.kernel.org/r/1481573103-11329-16-git-send-email-yamada.masahiro@socionext.com
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
- Add support for Marvell SD8787 Wifi/BT chip
- Improve UHS support for SDIO
- Invent MMC_CAP_3_3V_DDR and a DT binding for eMMC DDR 3.3V mode
- Detect Auto BKOPS enable bit
- Export eMMC device lifetime information through sysfs
- First take to slim down the public mmc headers to avoid abuse
- Re-factoring of the mmc block device driver to prepare for blkmq
- Cleanup code for the mmc block device driver
- Clarify and cleanup code dealing with data requests
- Cleanup some code by converting to ida_simple_ functions
- Cleanup code dealing with card quirks
- Cleanup private and public mmc header files
MMC host:
- Don't rely on public mmc headers to include non-mmc related headers
- meson: Add support for eMMC HS400 mode
- meson: Various cleanups and improvements
- omap_hsmmc: Use the proper provided busy timeout from the core
- sunxi: Enable new timings for the A64 MMC controllers
- sunxi: Improvements for clock management
- tmio: Improvements for SDIO interrupts
- mxs-mmc: Add CMD23 support
- sdhci-msm: Enable HS400 enhanced strobe mode support
- sdhci-msm: Correct HS400 tuning sequence
- sdhci-acpi: Support deferred probe
- sdhci-pci: Add support for eMMC HS200 tuning mode on AMD
- mediatek: Correct the implementation of card busy detection
- dw_mmc: Initial support for ZX mmc controller
- sh_mobile_sdhi: Enable support for eMMC HS200 mode
- sh_mmcif: Various cleanups and improvements
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Merge tag 'mmc-v4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc
Pull MMC updates from Ulf Hansson:
"MMC core:
- Add support for Marvell SD8787 Wifi/BT chip
- Improve UHS support for SDIO
- Invent MMC_CAP_3_3V_DDR and a DT binding for eMMC DDR 3.3V mode
- Detect Auto BKOPS enable bit
- Export eMMC device lifetime information through sysfs
- First take to slim down the public mmc headers to avoid abuse
- Re-factoring of the mmc block device driver to prepare for blkmq
- Cleanup code for the mmc block device driver
- Clarify and cleanup code dealing with data requests
- Cleanup some code by converting to ida_simple_ functions
- Cleanup code dealing with card quirks
- Cleanup private and public mmc header files
MMC host:
- Don't rely on public mmc headers to include non-mmc related headers
- meson: Add support for eMMC HS400 mode
- meson: Various cleanups and improvements
- omap_hsmmc: Use the proper provided busy timeout from the core
- sunxi: Enable new timings for the A64 MMC controllers
- sunxi: Improvements for clock management
- tmio: Improvements for SDIO interrupts
- mxs-mmc: Add CMD23 support
- sdhci-msm: Enable HS400 enhanced strobe mode support
- sdhci-msm: Correct HS400 tuning sequence
- sdhci-acpi: Support deferred probe
- sdhci-pci: Add support for eMMC HS200 tuning mode on AMD
- mediatek: Correct the implementation of card busy detection
- dw_mmc: Initial support for ZX mmc controller
- sh_mobile_sdhi: Enable support for eMMC HS200 mode
- sh_mmcif: Various cleanups and improvements"
* tag 'mmc-v4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc: (145 commits)
mmc: core: add mmc prefix for blk_fixups
mmc: core: move all quirks together into quirks.h
mmc: core: improve the quirks for sdio devices
mmc: core: move some sdio IDs out of quirks file
mmc: core: change quirks.c to be a header file
mmc: sdhci-cadence: fix bit shift of read data from PHY port
mmc: Adding AUTO_BKOPS_EN bit set for Auto BKOPS support
mmc: MAN_BKOPS_EN inverse debug message logic
mmc: meson-gx: add support for HS400 mode
mmc: meson-gx: remove unneeded checks in remove
mmc: meson-gx: reduce bounce buffer size
mmc: meson-gx: set max block count and request size
mmc: meson-gx: improve interrupt handling
mmc: meson-gx: improve meson_mmc_irq_thread
mmc: meson-gx: improve meson_mmc_clk_set
mmc: meson-gx: minor improvements in meson_mmc_set_ios
mmc: meson: Assign the minimum clk rate as close to 400KHz as possible
mmc: core: start to break apart mmc_start_areq()
mmc: block: respect bool returned from blk_end_request()
mmc: block: return errorcode from mmc_sd_num_wr_blocks()
...
That makes all the quirks table look more consistent.
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
It's not appreciated to place quirks everywhere, let's
put them together just like what we do for USB, PCI etc.
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Rename mmc_fixup_methods to sdio_fixup_methods to better
reflect that it's for sdio devices. So we could also pass
on it from sdio card's probe sequence just like what we do
for eMMC and block there.
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Consolidate all the sdio devices' IDs into sdio_ids.
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Rename quirks.c to quirks.h, and include it for
individual C files which need it.
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This macro is currently unused, but it may be useful for debug use.
Fix it just in case.
Fixes: ff6af28faf ("mmc: sdhci-cadence: add Cadence SD4HC support")
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Adding dedicated flag for AUTO_BKOPS in card->ext_csd structure.
Read AUTO_BKOPS bit value from the device EXT_CSD and set to the
card->ext_csd structure.
In mmc_decode_ext_csd() add a print message in case the AUTO_BKOPS
is enabled
Signed-off-by: Uri Yanai <uri.yanai@sandisk.com>
Signed-off-by: Alex Lemberg <alex.lemberg@sandisk.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Inverse the logic for printing the debug message.
In mmc_decode_ext_csd() print message when MAN_BKOPS_EN is set
Signed-off-by: Uri Yanai <uri.yanai@sandisk.com>
Signed-off-by: Alex Lemberg <alex.lemberg@sandisk.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Add support for HS400 mode.
The driver still misses support for tuning, therefore
highspeed modes like HS400 might not work under all
circumstances yet.
Successfully tested on a Odroid C2 (S905 GXBB).
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Tested-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
The remove callback is called only if probe finished successfully.
Therefore these checks are not needed.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Tested-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
A bounce buffer of 512K isn't needed as the max request size is
511 * 512 byte.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Tested-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
So far max_blk_count isn't set what results in a default of value 8
to be used (PAGE_SIZE / block size).
Block length field has 9 bits, so set max_blk_count to 2^9-1 = 511.
In addition set max_req_size because max_blk_count is also limited
by max_req_size / block_size.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Tested-by: Kevin Hilman <khilman@baylibre.com>
Acked-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Disabling and immediately re-enabling interrupts in meson_mmc_request
doesn't provide a benefit. Instead enable interrupts in probe already.
And disable interrupts in remove, this was missing so far.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Remove unneeded variable ret and simplify the if block.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Acked-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
The following changes are quite small, therefore I combined them in
one patch.
- ret doesn't need to be initialized with 0
- use standard !clk_rate notation to check for a zero value
- If clk_rate is zero we return here. Therefore all further checks
in this function for clk_rate != 0 are not needed.
- switch from dev_warn to dev_err if the clock can't be set
- If due to clock source and available divider values the requested
frequency isn't matched exactly (always the case if requested
frequency is 52 MHz), then just print the differing values as
debug message and not as warning.
- Also remove ret from the message as it is always 0.
- Set member current_clock to the current requested rate and
mmc->actual_clock to the current actual rate
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
val isn't used in the switch clause and afterwards there's an
identical statement. So remove it.
In case of an unexpected bus width the error message indicates
the intention to set the bus width to 4 and to go on.
So remove the return statement. This return statement also
conflicts with "setting to 4" because nothing would be set
actually before returning. 4bit bus width are chosen as
default as the vendor driver does it too.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Acked-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
The current code dealing with calculating mmc->f_min is a bit complicated.
Additionally, the attempt to set an initial clock rate should explicitly
use a rate between 100KHz to 400 KHz, according the (e)MMC/SD specs, which
it doesn't.
Fix the problem and clean up the code by using clk_round_rate() to pick the
nearest minimum rate to 400KHz (rounded down from 400kHz).
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
[Heiner: Changed from 100KHz to 400KHz to get a proper rounded rate]
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
This function is doing to many clever things at the same time under
too many various conditions.
Start to make things clearer by refactoring: break out the
finalization of the previous asynchronous request to its own
function mmc_finalize_areq(). We can get rid of the default
assignment of status and let the call deal with this.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
The return value from blk_end_request() is a bool but is
treated like an int. This is generally safe, but the variable
also has the opaque name "ret" and gets returned from the
helper function mmc_blk_cmd_err().
- Switch the variable to a bool, applies everywhere.
- Return a bool from mmc_blk_cmd_err() and rename the function
mmc_blk_rw_cmd_err() to indicate through the namespace that
this is a helper for mmc_blk_issue_rw_rq().
- Rename the variable from "ret" to "req_pending" inside the
while() loop inside mmc_blk_issue_rq_rq(), which finally
makes it very clear what this while loop is waiting for.
- Augment the argument "ret" to mmc_blk_rq_cmd_err() to
old_req_pending so it becomes evident that this is an
older state, and it is returned only if we fail to get
the number of written blocks from an SD card in the
function mmc_sd_num_wr_blocks().
- Augment the while() loop in mmc_blk_rq_cmd_abort(): it
is evident now that we know this is a bool variable,
that the function is just spinning waiting for
blk_end_request() to return false.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
mmc_sd_num_wr_blocks() has an interesting construction that
saves one return argument by casting (u32)-1 as error code
if something goes wrong.
This is however a bit confusing when the normal kernel
pattern is to return an int error code on success.
So instead pass a variable "blocks" that the function can
fill in with the number of successfully transferred blocks
and return an integer as error code.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
[Ulf: Changed a return code to -EIO, reported by Dan Carpenter and fixed
by Linus Walleij]
Commit 577fb13199 ("mmc: rework selection of bus speed mode")
refactored bus width selection code to mmc_select_bus_width().
However, it also altered the behavior to not call the selection code in
non-high-speed modes anymore.
This causes 1-bit mode to always be used when the high-speed mode is not
enabled, even though 4-bit and 8-bit bus are valid bus widths in the
backwards-compatibility (legacy) mode as well (see e.g. 5.3.2 Bus Speed
Modes in JEDEC 84-B50). This results in a significant regression in
transfer speeds.
Fix the code to allow 4-bit and 8-bit widths even without high-speed
mode, as before.
Tested with a Zynq-7000 PicoZed 7020 board.
Fixes: 577fb13199 ("mmc: rework selection of bus speed mode")
Signed-off-by: Anssi Hannula <anssi.hannula@bitwise.fi>
Cc: <stable@vger.kernel.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Instead of masking and setting two bits in the "flags" field
for the mmc_queue, just use two bools named "suspended" and
"new_request".
The masking and setting would likely have race conditions
anyways, it is better to use a simple member like this.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
The mmc_active member of struct mmc_queue_req has a very
confusing name: this is certainly not always "active", it is
the asynchronous request associated by the mmc_queue_req
but it is not guaranteed to be "active" in any sense, such
as being running on the host.
Simply rename this member to "areq".
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
The mmc_blk_rw_start_new() was named after the label inside
mmc_blk_issue_rw_rq() but is really a confusing name for this
function: what it does is to try to restart the latest issued
command on the host and card of the current MMC queue.
So rename it mmc_blk_rw_try_restart() that reflects what it
is doing and at this point also refactore the function to
treat the removed card as an exception and just exit if this
happens and run on in the function if that is not happening.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
With the coexisting __mmc_start_request(), mmc_start_request()
and __mmc_start_req() it is a bit confusing that mmc_start_req()
actually does not start a normal request, but an asynchronous
request.
Rename it to mmc_start_areq() to make it explicit what the
function is doing, also fix the kerneldoc for this function
while we're at it.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
In the function mmc_blk_issue_rw_rq() the new request coming in
from the block layer is called "rqc" and the old request that
was potentially just returned back from the asynchronous
mechanism is called "req".
This is really confusing when trying to analyze and understand
the code, it becomes a perceptual nightmare to me. Maybe others
have better parserheads but it is not working for me.
Rename "rqc" to "new_req" and "req" to "old_req" to reflect what
is semantically going on into the syntax.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
The goto statements sprinkled over the mmc_blk_issue_rw_rq()
function has grown over the years and makes the code pretty hard
to read.
Inline the calls such that:
goto cmd_abort; ->
mmc_blk_rw_cmd_abort(card, req);
mmc_blk_rw_start_new(mq, card, rqc);
return;
goto start_new_req; ->
mmc_blk_rw_start_new(mq, card, rqc);
return;
After this it is more clear how we exit the do {} while
loop in this function, and it gets possible to split the
code apart.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
ida code in block.c can be significantly simplified by switching to
the ida_simple_ functions.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Fixes: a45c6cb816 ("[ARM] 5369/1: omap mmc: Add new omap
hsmmc controller for 2430 and 34xx, v3")
when using really large timeout (up to 4*60*1000 ms for bkops)
there is a possibility of data overflow using
unsigned int so use 64 bit unsigned long long.
Signed-off-by: Ravikumar Kattekola <rk@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
commit e2bf08d643 ("omap_hsmmc: set a large data timeout for
commands with busy signal") sets an arbitrary timeout value (100ms) for
commands like CMD6 (MMC SWITCH). However extended CSD register defined
in the eMMC standard has a field for GENERIC_CMD6_TIME which indicates
the default maximum timeout for a SWITCH command.
Use busy_timeout of cmd structure (populated with GENERIC_CMD6_TIME
in the case of SWITCH command) to program the data timeout value in
omap_hsmmc driver.
SWITCH command to turn the cache on took more than 100ms to complete
with MICRON eMMC card present in AM572x IDK REV 1.3A resulting in
timeout and failed enumeration. It is fixed here by programming the
timeout with the value advertised in GENERIC_CMD6_TIME.
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Ravikumar Kattekola <rk@ti.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
When CEB (command end bit error) occurs
reset CMD line to avoid system ending up in
erroneous state.
While command line is reset for CTO and CCRC errors,
it's not done for CEB error. Fix it here.
Reviewed-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Ravikumar Kattekola <rk@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
