Some time ago, a fix was done for the sdhci-acpi driver, refer
commit 6e1c7d61 ("mmc: sdhci-acpi: Reduce Baytrail eMMC/SD/SDIO
hangs"). The same issue was not expected to affect the sdhci-pci driver,
but there have been reports to the contrary, so make the same hardware
setting change.

This patch applies to v5.0+ but before that backports will be required.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Add "fsl,ls1028a-esdhc" bindings for ls1028a eSDHC host controller
Signed-off-by: Yinbo Zhu <yinbo.zhu@nxp.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

The driver for Alcor Micro AU6601 and AU6621 controllers uses a pointer to
get from the private alcor_sdmmc_host structure to the generic mmc_host
structure. However the latter is always immediately preceding the former in
memory, so compute its address with a subtraction (which is cheaper than a
dereference) and drop the superfluous pointer.

No functional change intended.
Signed-off-by: Kamlesh Gurudasani <kamlesh.gurudasani@gmail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

The mtk-sd driver requires a regulator to be present, even if it is
the "fixed" regulator.  So select REGULATOR to make it hard to build
unusable configurations.
Signed-off-by: NeilBrown <neil@brown.name>
Reviewed-by: Chaotian Jing <chaotian.jing@mediatek.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

The mtk-sd silicon has integrated card-detect logic that is
enabled on the MT7621.  The circuit is phased out on newer hardware so
we should be careful to only enabled it on hardware known to support
it.  This a new "use_internal_cd" flag in struct mtk_mmc_compatible.

If the sdhci isn't marked non-removable and doesn't have a
cd-gpio configured, and if use_internal_cd is set, then assume the
internal cd logic should be used as recommended by
 Documentation/devicetree/bindings/mmc/mmc.txt
Signed-off-by: NeilBrown <neil@brown.name>
Reviewed-by: Chaotian Jing <chaotian.jing@mediatek.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

mt7620 family MIPS SOCs contain the mtk-sd silicon.
Add support for this.
Signed-off-by: NeilBrown <neil@brown.name>
Reviewed-by: Chaotian Jing <chaotian.jing@mediatek.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

When using devicetree for configuration, interrupt trigger type
should be described in the dts file, not hard-coded in the C code.

The mtk-sd silicon in the mt7621 soc uses an active-high interrupt
and so cannot be used with the current code.

So replace IRQF_TRIGGER_LOW with IRQF_TRIGGER_NONE.

Also IRQF_ONESHOT is not needed - it is used for threaded interrupt
handlers, and this driver does not used a threaded interrupt handler.
So remove that setting.
Signed-off-by: NeilBrown <neil@brown.name>
Reviewed-by: Chaotian Jing <chaotian.jing@mediatek.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

The tag set is allocated in mmc_init_queue but never freed. This results
in a memory leak. This change makes sure we free the tag set when the
queue is also freed.
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Fixes: 81196976 ("mmc: block: Add blk-mq support")
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Add binding documentation of mtk-sd for MT8516 SoCs.
Signed-off-by: Fabien Parent <fparent@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

The IRQ handler, mmci_irq(), loops until all status bits have been cleared.
However, the status bit signaling busy in variant->busy_detect_flag, may be
set even if busy detection isn't monitored for the current request.

This may be the case for the CMD11 when switching the I/O voltage, which
leads to that mmci_irq() busy loops in IRQ context. Fix this problem, by
clearing the status bit for busy, before continuing to validate the
condition for the loop. This is safe, because the busy status detection has
already been taken care of by mmci_cmd_irq().
Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Let's cleanup the mmci_cmd_irq() a bit, to make the busy detect code more
clear.
Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

In preparation to enabling -Wimplicit-fallthrough, mark switch
cases where we are expecting to fall through.

This patch fixes the following warnings:

In file included from drivers/mmc/host/usdhi6rol0.c:9:
drivers/mmc/host/usdhi6rol0.c: In function ‘usdhi6_timeout_work’:
./include/linux/device.h:1483:2: warning: this statement may fall through [-Wimplicit-fallthrough=]
  _dev_err(dev, dev_fmt(fmt), ##__VA_ARGS__)
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/mmc/host/usdhi6rol0.c:1689:3: note: in expansion of macro ‘dev_err’
   dev_err(mmc_dev(host->mmc), "Invalid state %u\n", host->wait);
   ^~~~~~~
drivers/mmc/host/usdhi6rol0.c:1691:2: note: here
  case USDHI6_WAIT_FOR_CMD:
  ^~~~
drivers/mmc/host/usdhi6rol0.c:1711:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
   usdhi6_sg_unmap(host, true);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/mmc/host/usdhi6rol0.c:1716:2: note: here
  case USDHI6_WAIT_FOR_DATA_END:
  ^~~~
  CC [M]  drivers/isdn/hisax/hisax_isac.o
drivers/mmc/host/usdhi6rol0.c: In function ‘usdhi6_stop_cmd’:
drivers/mmc/host/usdhi6rol0.c:1338:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
   if (mrq->stop->opcode == MMC_STOP_TRANSMISSION) {
      ^
drivers/mmc/host/usdhi6rol0.c:1343:2: note: here
  default:
  ^~~~~~~

Warning level 3 was used: -Wimplicit-fallthrough=3

This patch is part of the ongoing efforts to enable
-Wimplicit-fallthrough.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

The SD Physical Layer Spec says the following: Since the SD Memory Card
shall support at least the two bus modes 1-bit or 4-bit width, then any SD
Card shall set at least bits 0 and 2 (SD_BUS_WIDTH="0101").

This change verifies the card has specified a bus width.

AMD SDHC Device 7806 can get into a bad state after a card disconnect
where anything transferred via the DATA lines will always result in a
zero filled buffer. Currently the driver will continue without error if
the HC is in this condition. A block device will be created, but reading
from it will result in a zero buffer. This makes it seem like the SD
device has been erased, when in actuality the data is never getting
copied from the DATA lines to the data buffer.

SCR is the first command in the SD initialization sequence that uses the
DATA lines. By checking that the response was invalid, we can abort
mounting the card.
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Add HS400 support for iMX7ULP B0.

According to IC suggest, need to clear the STROBE_DLL_CTRL_RESET
before any setting of STROBE_DLL_CTRL register.

USDHC has register bits(bit[27~20] of register STROBE_DLL_CTRL)
for slave sel value. If this register bits value is 0,  it needs
256 ref_clk cycles to update slave sel value. IC suggest to set
bit[27~20] to 0x4, it only need 4 ref_clk cycle to update slave
sel value. This will short the lock time of slave.

i.MX7ULP B0 will need more time to lock the REF and SLV, so change
to add 5us delay.
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

On some SoCs such as i.MX7ULP, there is no busfreq
driver, but cpuidle has some levels which may disable
system/bus clocks, so need to add pm_qos to prevent
cpuidle from entering low level idles and make sure
system/bus clocks are enabled when usdhc is active.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Add imx7ulp compatible string.
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Use signal resampling tuning for the UHS and HS200 modes.
Instead of trying to get the *best* resampling setting with complex
window calculation, we just stop on the first working setting.

If the tuning setting later proves unstable, we will just continue the
tuning where we left it.
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Tested-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

This remove all the code related to phase settings. Using the Rx phase
for tuning has not been reliable. We had several issues over the past
months, on both v2 and v3 mmc chips After discussing the issue matter
with Amlogic, They suggested to set a phase shift of 180 between Core and
Tx and use signal resampling for the tuning.

Since we won't be playing with the phase anymore, let's remove all the
clock code related to it and set the appropriate value on init.
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Tested-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Activating DDR in the Amlogic mmc controller, among other things, will
divide the output clock by 2. So by activating it with clock on, we are
creating a glitch on the output.

Instead, let's deal with DDR when the clock output is off, when setting
the clock.
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Tested-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

At the moment, all our attempts to enable HS400 on Amlogic chipsets have
been unsuccessful or unreliable. Until we can figure out how to enable this
mode safely and reliably, let's force it off.
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

There is no reason for another device to request the MMC irq. It should
only be used the MMC device, so remove IRQ_SHARED and replace by
IRQ_ONESHOT as we don't the irq to fire again until the irq thread is
done
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

This is merely a clean up. It makes sense to only ack raised irqs
instead of acking everything all the time.
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

There is already a function available to poll a register until a
condition is met. Let's use it instead of open coding it.
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Using dev_get_drvdata directly.
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

DMA on this hardware is limited to dealing with a 4096 bytes at a
time. Previously, the driver was set up accordingly to request single-page
DMA buffers, however that had the effect of generating a large number
of small MMC requests for data I/O.

Improve the driver to accept multi-entry scatter-gather lists. The size of
each entry is already capped to 4096 bytes (AU6601_MAX_DMA_BLOCK_SIZE),
matching the hardware requirements. Existing driver code already iterates
through remaining sglist entries after each DMA transfer is complete.

Also add some comments to help clarify the situation, and clear up
some of the confusion I had regarding DMA vs PIO.

Testing with dd, this increases write performance from 2mb/sec to
10mb/sec, and increases read performance from 4mb/sec to 14mb/sec.
Signed-off-by: Daniel Drake <drake@endlessm.com>
Link: http://lkml.kernel.org/r/CAD8Lp47JYdZzbV9F+asNwvSfLF_po_J7ir6R_Vb-Dab21_=Krw@mail.gmail.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

This reverts commit 57ebb96c293da9f0ec56aba13c5541269a5c10b1.

Usage of the DMA page iterator was problematic here because
we were not considering offset & length of entries in the scatterlist.

Also, after further discussion, the suggested revised approach is much
more similar to the driver implementation before this commit was
applied, so revert it.
Signed-off-by: Daniel Drake <drake@endlessm.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/memstick/host/tifm_ms.c: In function 'tifm_ms_issue_cmd':
drivers/memstick/host/tifm_ms.c:259:17: warning:
 variable 'data' set but not used [-Wunused-but-set-variable]

It's not used any more since commit 92b22d93 ("tifm: fix the
MemoryStick host fifo handling code")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

In the function mmc_alloc_host, the function put_device is called to
release allocated resources when mmc_gpio_alloc fails. Finally, the
function pointed by host->class_dev.class->dev_release (i.e.,
mmc_host_classdev_release) is used to release resources including the
host structure. However, after put_device, host is used and released
again. Resulting in a use-after-free bug.

Fixes: 1ed21719 ("mmc: core: fix error path in mmc_host_alloc")
Signed-off-by: Pan Bian <bianpan2016@163.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

!voltage_ranges is tested for too late, allowing warning and undefined
behavior. Fix that.
Signed-off-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

According to eMMC specification v5.1 section 6.4.3, we should issue
CMD1 repeatedly in the idle state until the eMMC is ready even if
the mmc_attach_mmc() calls this function with ocr = 0. Otherwise
some eMMC devices seems to enter the inactive mode after
mmc_init_card() issued CMD0 when the eMMC device is busy.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

This patch adds suspend and resume PM ops for tegra SDHCI.
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Remove finish_tasklet. Requests that require DMA-unmapping or sdhci_reset
are completed either in the IRQ thread or a workqueue if the completion is
not initiated by the IRQ.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Faiz Abbas <faiz_abbas@ti.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

In preparation for removing finish_tasklet, call mmc_request_done() from
the IRQ handler if possible. That will alleviate the potential loss of
performance from shifting away from finish_tasklet.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Faiz Abbas <faiz_abbas@ti.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

In preparation for removing finish_tasklet, move some processing from
sdhci_request_done() to __sdhci_finish_mrq().
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Faiz Abbas <faiz_abbas@ti.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

In preparation for removing finish_tasklet, move some functions.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Faiz Abbas <faiz_abbas@ti.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

In preparation for removing finish_tasklet, reorganize sdhci_finish_mrq()
and __sdhci_finish_mrq() to separate the tasklet scheduling from other
processing.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Faiz Abbas <faiz_abbas@ti.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/memstick/host/jmb38x_ms.c: In function 'jmb38x_ms_issue_cmd':
drivers/memstick/host/jmb38x_ms.c:371:17: warning:
 variable 'data' set but not used [-Wunused-but-set-variable]

It's never used since introduction and can be removed.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Cc: Chaotian Jing <chaotian.jing@mediatek.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Chaotian Jing <chaotian.jing@mediatek.com>

Add PCI Ids for Intel CML.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

pwrseq_emmc.c implements a HW reset procedure for eMMC chip by driving a
GPIO line.

It registers the .reset() cb on mmc_pwrseq_ops and it registers a system
restart notification handler; both of them perform reset by unconditionally
calling gpiod_set_value().

If the eMMC reset line is tied to a GPIO controller whose driver can sleep
(i.e. I2C GPIO controller), then the kernel would spit warnings when trying
to reset the eMMC chip by means of .reset() mmc_pwrseq_ops cb (that is
exactly what I'm seeing during boot).

Furthermore, on system reset we would gets to the system restart
notification handler with disabled interrupts - local_irq_disable() is
called in machine_restart() at least on ARM/ARM64 - and we would be in
trouble when the GPIO driver tries to sleep (which indeed doesn't happen
here, likely because in my case the machine specific code doesn't call
do_kernel_restart(), I guess..).

This patch fixes the .reset() cb to make use of gpiod_set_value_cansleep(),
so that the eMMC gets reset on boot without complaints, while, since there
isn't that much we can do, we avoid register the restart handler if the
GPIO controller has a sleepy driver (and we spit a dev_notice() message to
let people know)..

This had been tested on a downstream 4.9 kernel with backported
commit 83f37ee7ba33 ("mmc: pwrseq: Add reset callback to the struct
mmc_pwrseq_ops") and commit ae60fb031cf2 ("mmc: core: Don't do eMMC HW
reset when resuming the eMMC card"), because I couldn't boot my board
otherwise. Maybe worth to RFT.
Signed-off-by: Andrea Merello <andrea.merello@gmail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>