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: NPan Bian <bianpan2016@163.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

!voltage_ranges is tested for too late, allowing warning and undefined
behavior. Fix that.
Signed-off-by: NPavel Machek <pavel@ucw.cz>
Signed-off-by: NUlf 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: NYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

This patch adds suspend and resume PM ops for tegra SDHCI.
Acked-by: NThierry Reding <treding@nvidia.com>
Signed-off-by: NSowjanya Komatineni <skomatineni@nvidia.com>
Signed-off-by: NUlf 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: NAdrian Hunter <adrian.hunter@intel.com>
Reviewed-by: NFaiz Abbas <faiz_abbas@ti.com>
Signed-off-by: NUlf 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: NAdrian Hunter <adrian.hunter@intel.com>
Reviewed-by: NFaiz Abbas <faiz_abbas@ti.com>
Signed-off-by: NUlf 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: NAdrian Hunter <adrian.hunter@intel.com>
Reviewed-by: NFaiz Abbas <faiz_abbas@ti.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

In preparation for removing finish_tasklet, move some functions.
Signed-off-by: NAdrian Hunter <adrian.hunter@intel.com>
Reviewed-by: NFaiz Abbas <faiz_abbas@ti.com>
Signed-off-by: NUlf 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: NAdrian Hunter <adrian.hunter@intel.com>
Reviewed-by: NFaiz Abbas <faiz_abbas@ti.com>
Signed-off-by: NUlf 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: NYueHaibing <yuehaibing@huawei.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

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

Add PCI Ids for Intel CML.
Signed-off-by: NAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: NUlf 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: NAndrea Merello <andrea.merello@gmail.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

'top_base' memory region is optional. Check that the resource is valid
before using it. This avoid getting a "invalid resource" error message
printed by the kernel.
Signed-off-by: NFabien Parent <fparent@baylibre.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

DMA on this hardware is limited to dealing with a single page 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 scatter-gather DMA buffers of larger sizes.
Iterate through those buffers a page at a time.

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: NDaniel Drake <drake@endlessm.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

According to the AM654x Data Manual[1], the setup timing in lower speed
modes can only be met if the controller uses a falling edge data launch.

To ensure this, the HIGH_SPEED_ENA (HOST_CONTROL[2]) bit should be
cleared in default speed, SD high speed, MMC high speed, SDR12 and SDR25
speed modes.

Use the sdhci writeb callback to implement this condition.

[1] http://www.ti.com/lit/gpn/am6546 Section 5.10.5.16.1
Signed-off-by: NFaiz Abbas <faiz_abbas@ti.com>
Acked-by: NAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

The amount of changes to the memorystick subsystem are limited as of today.
However, I have a couple of times been funneling changes through my MMC
tree and it have turned out fine. So, I am here by volunteering to continue
doing this, by adding myself and the link to the MMC tree to the MEMSTICK
section.

Cc: Alex Dubov <oakad@yahoo.com>
Cc: Alex Dubov <alex.dubov@gmail.com>
Cc: Maxim Levitsky <maximlevitsky@gmail.com>
Cc: Kai-Heng Feng <kai.heng.feng@canonical.com>
Cc: Rui Feng <rui_feng@realsil.com.cn>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>
Acked-by: NMaxim Levitsky <maximlevitsky@gmail.com>

The current SONY MEMORYSTICK CARD SUPPORT section is pointing to the TI
flash media memorystick driver, which is a bit confusing. Let's make this
more clear by moving this part into TI FLASH MEDIA INTERFACE DRIVER
section, but rename the section to TI FLASH MEDIA MEMORYSTICK/MMC DRIVERS,
as to make it more clear.

Finally, add Alex Dubov to the SONY MEMORYSTICK STANDARD SUPPORT, as I
believe that has been the intention.

Cc: Alex Dubov <oakad@yahoo.com>
Cc: Alex Dubov <alex.dubov@gmail.com>
Cc: Maxim Levitsky <maximlevitsky@gmail.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Reduce size of duplicated comments by switching to use SPDX identifier.

No functional change.
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

- spaces surrounding arithmetic operators
- utilize full line limit
- drop extra spaces / TABs in variable definitions
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

For easy grepping on debug purposes join string literals back in
the messages.

No functional change.

While here, join list of module authors as well.
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

The mmc pointer can't be NULL at ->remove(), drop the useless check.
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Driver core sets it to NULL upon probe failure or release.
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

This patch allows to get datactrl configuration specific
at variant. This introduce more flexibility on datactlr
value.
Signed-off-by: NLudovic Barre <ludovic.barre@st.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

This patch defines get_dctrl_cfg callback for sdmmc variant.
sdmmc variant has specific stm32 transfer modes.
sdmmc data transfer mode selection could be:
-Block data transfer ending on block count.
-SDIO multibyte data transfer.
-MMC Stream data transfer (not used).
-Block data transfer ending with STOP_TRANSMISSION command.
Signed-off-by: NLudovic Barre <ludovic.barre@st.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

This patch defines get_dctrl_cfg callback for qcom variant.
qcom variant has a specific block size definition.
Signed-off-by: NLudovic Barre <ludovic.barre@st.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

This patch defines get_dctrl_cfg callback for legacy variants
whatever DMA_ENGINE configuration.
Signed-off-by: NLudovic Barre <ludovic.barre@st.com>
[Ulf: Fixed a build error]
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

This patch adds get_datactrl_cfg callback in mmci_host_ops
to allow to get datactrl configuration specific at variant.
Common helper function is defined and could be call by variant.
Signed-off-by: NLudovic Barre <ludovic.barre@st.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Enable the DMA codepath for writes as well as reads.
This improves write speed from 1mb/sec to 2mb/sec (tested with dd).

The original ampe_stor vendor driver also uses DMA for writes.
Signed-off-by: NDaniel Drake <drake@endlessm.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Direct commands (DCMDs) are an optional feature of eMMC 5.1's command
queue engine (CQE). The Arasan eMMC 5.1 controller uses the CQHCI,
which exposes a control register bit to enable the feature.
The current implementation sets this bit unconditionally.

This patch allows to suppress the feature activation,
by specifying the property disable-cqe-dcmd.
Signed-off-by: NChristoph Muellner <christoph.muellner@theobroma-systems.com>
Signed-off-by: NPhilipp Tomsich <philipp.tomsich@theobroma-systems.com>
Acked-by: NAdrian Hunter <adrian.hunter@intel.com>
Fixes: 84362d79 ("mmc: sdhci-of-arasan: Add CQHCI support for arasan,sdhci-5.1")
Cc: stable@vger.kernel.org
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Add disable-cqe-dcmd as optional property for MMC hosts.
This property allows to disable or not enable the direct command
features of the command queue engine.
Signed-off-by: NChristoph Muellner <christoph.muellner@theobroma-systems.com>
Signed-off-by: NPhilipp Tomsich <philipp.tomsich@theobroma-systems.com>
Fixes: 84362d79 ("mmc: sdhci-of-arasan: Add CQHCI support for arasan,sdhci-5.1")
Cc: stable@vger.kernel.org
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Fix sparse warning:

drivers/mmc/host/sdhci-omap.c:788:6: warning:
 symbol 'sdhci_omap_reset' was not declared. Should it be static?
Signed-off-by: NYueHaibing <yuehaibing@huawei.com>
Reviewed-by: NFaiz Abbas <faiz_abbas@ti.com>
Acked-by: NAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Tegra CQHCI/SDHCI design prevents write access to SDHCI block size
register when CQE is enabled and unhalted.

CQHCI driver enables CQE prior to invoking sdhci_cqe_enable which
violates this Tegra specific host requirement.

This patch fixes this by configuring sdhci block registers prior
to CQE unhalt.

This patch also has a fix for retry of unhalt due to known Tegra
specific CQE resume bug where first unhalt might not succeed when
clear all tasks is performed prior to resume and need a second unhalt.

This patch also includes CQE enable fix for CMD CRC errors that
happen with the specific sandisk emmc device when status command
is sent during the transfer of last data block due to marginal timing.
Tested-by: NJon Hunter <jonathanh@nvidia.com>
Acked-by: NAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: NSowjanya Komatineni <skomatineni@nvidia.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

This patch adds define for CBC field mask of the register
CQHCI_SSC1.
Tested-by: NJon Hunter <jonathanh@nvidia.com>
Acked-by: NAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: NSowjanya Komatineni <skomatineni@nvidia.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

Tegra186 CQHCI host has a known bug where CQHCI controller selects
DATA_PRESENT_SELECT bit to 1 for DCMDs with R1B response type and
since DCMD does not trigger any data transfer, DCMD task complete
happens leaving the DATA FSM of host controller in wait state for
the data.

This effects the data transfer tasks issued after the DCMDs with
R1b response type resulting in timeout.

SW WAR is to set CMD_TIMING to 1 in DCMD task descriptor. This bug
and SW WAR is applicable only for Tegra186 and not for Tegra194.

This patch implements this WAR thru NVQUIRK_CQHCI_DCMD_R1B_CMD_TIMING
for Tegra186 and also implements update_dcmd_desc of cqhci_host_ops
interface to set CMD_TIMING bit depending on the NVQUIRK.
Tested-by: NJon Hunter <jonathanh@nvidia.com>
Reviewed-by: NRitesh Harjani <riteshh@codeaurora.org>
Signed-off-by: NSowjanya Komatineni <skomatineni@nvidia.com>
Acked-by: NAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

This patch adds update_dcmd_desc interface to cqhci_host_ops to
allow hosts to update any of the DCMD task descriptor attributes
and parameters.
Tested-by: NJon Hunter <jonathanh@nvidia.com>
Reviewed-by: NRitesh Harjani <riteshh@codeaurora.org>
Signed-off-by: NSowjanya Komatineni <skomatineni@nvidia.com>
Acked-by: NAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

SDHCI controller of Tegra194 is similar to SDHCI controller in Tegra186.
This patch documents Tegra194 sdhci compatible string.
Signed-off-by: NSowjanya Komatineni <skomatineni@nvidia.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

This patch includes below HW tuning related fixes.
    configures tuning parameters as per Tegra TRM
    WAR fix for manual tap change
    HW auto-tuning post process

As per Tegra TRM, SDR50 mode tuning execution takes upto maximum
of 256 tuning iterations and SDR104/HS200/HS400 modes tuning
execution takes upto maximum of 128 tuning iterations.

This patch programs tuning control register with maximum tuning
iterations needed based on the timing along with the start tap,
multiplier, and step size used by the HW tuning.

Tegra210 has a known issue of glitch on trimmer output when the
tap value is changed with the trimmer input clock running and the
WAR is to disable card clock before sending tuning command and
after sending tuning command wait for 1usec and issue SW reset
followed by enabling card clock.

This WAR is applicable when changing tap value manually as well.
Tegra SDHCI driver has this implemented correctly for manual tap
change but missing SW reset before enabling card clock during
sending tuning command.

Issuing SW reset during tuning command as a part of WAR and is
applicable in cases where tuning is performed with single step size
for more iterations. This patch includes this fix.

HW auto-tuning finds the best largest passing window and sets the
tap at the middle of the window. With some devices like sandisk
eMMC driving fast edges and due to high tap to tap delay in the
Tegra chipset, auto-tuning does not detect falling tap between the
valid windows resulting in a parital window or a merged window and
the best tap is set at the signal transition which is actually the
worst tap location.

Recommended SW solution is to detect if the best passing window
picked by the HW tuning is a partial or a merged window based on
min and max tap delays found from chip characterization across
PVT and perform tuning correction to pick the best tap.

This patch has implementation of this post HW tuning process for
the tegra hosts that support HW tuning through the callback function
tegra_sdhci_execute_hw_tuning and uses the tuned tap delay.
Tested-by: NJon Hunter <jonathanh@nvidia.com>
Signed-off-by: NSowjanya Komatineni <skomatineni@nvidia.com>
Acked-by: NAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

As per the Host Controller Standard Specification Version 4.20,
limitation of tuning iteration count is removed as PLL locking
time can be longer than UHS-1 tuning due to larger PVT fluctuation
and it will result in increase of tuning iteration to complete the
tuning.

This patch creates sdhci_host member tuning_loop_count to allow
hosts to specify maximum tuning iterations and also updates
execute_tuning to use this specified maximum tuning iteration count.

Default tuning_loop_count is set to same as existing loop count of
MAX_TUNING_LOOP which is 40 iterations.
Tested-by: NJon Hunter <jonathanh@nvidia.com>
Signed-off-by: NSowjanya Komatineni <skomatineni@nvidia.com>
Acked-by: NAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

ddr_signaling is set to true for DDR50 and DDR52 modes but is
not set back to false for other modes. This programs incorrect
host clock when mode change happens from DDR52/DDR50 to other
SDR or HS modes like incase of mmc_retune where it switches
from HS400 to HS DDR and then from HS DDR to HS mode and then
to HS200.

This patch fixes the ddr_signaling to set properly for non DDR
modes.
Tested-by: NJon Hunter <jonathanh@nvidia.com>
Acked-by: NAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: NSowjanya Komatineni <skomatineni@nvidia.com>
Cc: stable@vger.kernel.org # v4.20 +
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>