If we happened to get a data error at just the wrong time the dw_mmc
driver could get into a state where it would never complete its
request. That would leave the caller just hanging there.
We fix this two ways and both of the two fixes on their own appear to
fix the problems we've seen:
1. Fix a race in the tasklet where the interrupt setting the data
error happens _just after_ we check for it, then we get a
EVENT_XFER_COMPLETE. We fix this by repeating a bit of code.
2. Fix it so that if we detect that we've got an error in the "data
busy" state and we're not going to do anything else we end the
request and unblock anyone waiting.
Signed-off-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Yuvaraj Kumar C D <yuvaraj.cd@gmail.com>
Acked-by: Seungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This patch changes the fifo reset code to follow the reset procedure
outlined in the documentation of Synopsys Mobile storage host databook.
Signed-off-by: Sonny Rao <sonnyrao@chromium.org>
Signed-off-by: Yuvaraj Kumar C D <yuvaraj.cd@samsung.com>
Acked-by: Seungwon Jeon <tgih.jun@samsung.com>
[sonnyrao: fix compile for !CONFIG_MMC_DW_IDMAC case]
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Data errors are completely expected during tuning. Printing them out
is confusing people looking at the kernel logs. They see things like:
[ 3.613296] dwmmc_exynos 12200000.dwmmc0: data error, status 0x00000088
...and they think something is wrong with their hardware.
Remove the printouts. We'll leave it up to a higher level to report
about errors.
Signed-off-by: Doug Anderson <dianders@chromium.org>
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>
Restore the card-present checking point.
(The following part was removed from commit bf626e5 ("mmc: dw_mmc:
use slot-gpio to handle cd pin")
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>
Since using the device-tree, didn't use the callback pointer.
So removed the unused callback pointer.
When the set_power callback is used, it should be added in future.
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>
It's right to check immediately whether host->bus_hz is assigned or not.
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>
mmc_of_parse() have been already parsed the general capability.
Didn't need to use the local parser.
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Acked-by: Seungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>
Replaced UHS_DDR50 with MMC_DDR52. And MMC_CAP_UHS_DDR50
is removed because of non-implementation of UHS signaling.
Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>
Core:
- CONFIG_MMC_UNSAFE_RESUME=y is now default behavior.
- DT bindings for SDHCI UHS, eMMC HS200, high-speed DDR, at 1.8/1.2V.
- Add GPIO descriptor based slot-gpio card detect API.
Drivers:
- dw_mmc: Refactor SOCFPGA support as a variant inside dw_mmc-pltfm.c.
- mmci: Support HW busy detection on ux500.
- omap: Support MMC_ERASE.
- omap_hsmmc: Support MMC_PM_KEEP_POWER, MMC_PM_WAKE_SDIO_IRQ, (a)cmd23.
- rtsx: Support pre-req/post-req async.
- sdhci: Add support for Realtek RTS5250 controllers.
- sdhci-acpi: Add support for 80860F16, fix 80860F14/SDIO card detect.
- sdhci-msm: Add new driver for Qualcomm SDHCI chipset support.
- sdhci-pxav3: Add support for Marvell Armada 380 and 385 SoCs.
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Merge tag 'mmc-updates-for-3.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc
Pull MMC updates from Chris Ball:
"MMC highlights for 3.15:
Core:
- CONFIG_MMC_UNSAFE_RESUME=y is now default behavior
- DT bindings for SDHCI UHS, eMMC HS200, high-speed DDR, at 1.8/1.2V
- Add GPIO descriptor based slot-gpio card detect API
Drivers:
- dw_mmc: Refactor SOCFPGA support as a variant inside dw_mmc-pltfm.c
- mmci: Support HW busy detection on ux500
- omap: Support MMC_ERASE
- omap_hsmmc: Support MMC_PM_KEEP_POWER, MMC_PM_WAKE_SDIO_IRQ, (a)cmd23
- rtsx: Support pre-req/post-req async
- sdhci: Add support for Realtek RTS5250 controllers
- sdhci-acpi: Add support for 80860F16, fix 80860F14/SDIO card detect
- sdhci-msm: Add new driver for Qualcomm SDHCI chipset support
- sdhci-pxav3: Add support for Marvell Armada 380 and 385 SoCs"
* tag 'mmc-updates-for-3.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc: (102 commits)
mmc: sdhci-acpi: Intel SDIO has broken card detect
mmc: sdhci-pxav3: add support for the Armada 38x SDHCI controller
mmc: sdhci-msm: Add platform_execute_tuning implementation
mmc: sdhci-msm: Initial support for Qualcomm chipsets
mmc: sdhci-msm: Qualcomm SDHCI binding documentation
sdhci: only reprogram retuning timer when flag is set
mmc: rename ARCH_BCM to ARCH_BCM_MOBILE
mmc: sdhci: Allow for irq being shared
mmc: sdhci-acpi: Add device id 80860F16
mmc: sdhci-acpi: Fix broken card detect for ACPI HID 80860F14
mmc: slot-gpio: Add GPIO descriptor based CD GPIO API
mmc: slot-gpio: Split out CD IRQ request into a separate function
mmc: slot-gpio: Record GPIO descriptors instead of GPIO numbers
Revert "dts: socfpga: Add support for SD/MMC on the SOCFPGA platform"
mmc: sdhci-spear: use generic card detection gpio support
mmc: sdhci-spear: remove support for power gpio
mmc: sdhci-spear: simplify resource handling
mmc: sdhci-spear: fix platform_data usage
mmc: sdhci-spear: fix error handling paths for DT
mmc: sdhci-bcm-kona: fix build errors when built-in
...
Tejun Heo has made WQ_NON_REENTRANT useless in the dbf2576e37
("workqueue: make all workqueues non-reentrant"). So remove its
usages and definition.
This patch doesn't introduce any behavior changes.
tj: minor description updates.
Signed-off-by: ZhangZhen <zhenzhang.zhang@huawei.com>
Sigend-off-by: Tejun Heo <tj@kernel.org>
Acked-by: James Chapman <jchapman@katalix.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
If mrq->sbc is not NULL but data->stop happens to be NULL,
it will lead to NULL pointer dereferencing. Avoid this by
having a NULL check for data->stop.
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Acked-by: Seungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: Chris Ball <chris@printf.net>
bf626e5550 ("mmc: dw_mmc: use slot-gpio to handle cd pin") caused
CDETECT to be ignored, since negated return value of mmc_gpio_get_cd(mmc)
can not be checked by IS_ERR_VALUE.
Also, add spin_lock_bh(&host->lock) for atomic access to
DW_MMC_CARD_PRESENT, otherwise sd detect may occasionally fail.
Signed-off-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Reported-by: Kevin Hilman <khilman@linaro.org>
Reviewed-by: Sachin Kamat <sachin.kamat@linaro.org>
Tested-by: Sachin Kamat <sachin.kamat@linaro.org>
Tested-by: Kevin Hilman <khilman@linaro.org>
Acked-by: Seungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: Chris Ball <chris@printf.net>
Suggested by Jaehoon: Use slot-gpio to handle cd-gpio
Add function dw_mci_of_get_cd_gpio to check "cd-gpios" from dts.
mmc_gpio_request_cd and mmc_gpio_get_cd are used to handle cd pin
Signed-off-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Chris Ball <chris@printf.net>
Suspend and resume of cards are being handled from the protocol layer
and consequently the mmc_suspend|resume_host APIs are deprecated.
This means we can simplify the suspend|resume callbacks by removing the
use of the deprecated APIs.
Cc: Seungwon Jeon <tgih.jun@samsung.com>
Cc: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
In IDMAC mode EVENT_XFER_COMPLETE is set when RI/TI of last descriptor
is done. So if errors are happened in the middle of data transfers,
'dw_mci_stop_dma' during error handing can be called and eventually
prevents this flag to be set. This results in permanent wait for
EVENT_XFER_COMPLETE in 'dw_mci_tasklet_func'. Therefore, if dma
running is stopped forcibly, EVENT_XFER_COMPLETE should be set.
Reported-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Tested-by: Alim Akhtar <alim.akhtar@samsung.com>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
First, compiling warning along with previous change is removed.
[drivers/mmc/host/dw_mmc.c:1890:7: warning: unused variable 'ctrl']
And with the recommendation in manual, IDMAC software reset is followed
by dma-reset of the CTRL register in order to terminate the transfer.
Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Tested-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
There are three resets in CTRL register. FIFO reset is especially used
in several points with the same routine. It could be replaced with one
function and the others may be applied similarly if needed. So,
mci_wait_reset() is modified to allow various bit field of reset.
Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Tested-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Main change corresponds to dw_mci_command_complete(). And EBE is
divided into read and write. Some minor changes for code readability.
Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Tested-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
In error cases, DTO interrupt may or may not be generated depending
on remained data. Stop/Abort command ensures DTO generation for that
situation. Currently if 'stop' field of data is empty, there is no
stop/abort command. So, it could hang waiting DTO. This change
reinforces these cases.
Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Tested-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Even if response error is detected in case data command, data transfer
is continued. It means that data can live in FIFO. Current handling
just breaks out the request when seeing the command error. This causes
kernel panic in dw_mci_read_data_pio() [host->data = NULL]. And also,
FIFO should be guaranteed to be empty.
Unable to handle kernel NULL pointer dereference at virtual address 00000018
<...>
[<c02af814>] (dw_mci_read_data_pio+0x68/0x198) from [<c02b04b4>] (dw_mci_interrupt+0x374/0x3a0)
[<c02b04b4>] (dw_mci_interrupt+0x374/0x3a0) from [<c006b094>] (handle_irq_event_percpu+0x50/0x194)
[<c006b094>] (handle_irq_event_percpu+0x50/0x194) from [<c006b214>] (handle_irq_event+0x3c/0x5c)
[<c006b214>] (handle_irq_event+0x3c/0x5c) from [<c006de1c>] (handle_fasteoi_irq+0xa4/0x148)
[<c006de1c>] (handle_fasteoi_irq+0xa4/0x148) from [<c006aa88>] (generic_handle_irq+0x20/0x30)
[<c006aa88>] (generic_handle_irq+0x20/0x30) from [<c000f154>] (handle_IRQ+0x38/0x90)
[<c000f154>] (handle_IRQ+0x38/0x90) from [<c00085bc>] (gic_handle_irq+0x34/0x68)
[<c00085bc>] (gic_handle_irq+0x34/0x68) from [<c0011f40>] (__irq_svc+0x40/0x70)
Exception stack(0xef0b1c00 to 0xef0b1c48)
1c00: 000eb0cf ffffffff 00001300 c01a7738 ef295e10 0000000a c04df298 ef0b1dc0
1c20: ef295ec0 00000000 00000000 00000006 00000000 ef0b1c48 c02b1274 c01a7764
1c40: 20000113 ffffffff
[<c0011f40>] (__irq_svc+0x40/0x70) from [<c01a7764>] (__loop_delay+0x0/0xc)
Code: e1a00005 e0891006 e0662004 e12fff33 (e59a3018)
---[ end trace a7043b9ba9aed1db ]---
Kernel panic - not syncing: Fatal exception in interrupt
Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Tested-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Card Read Threshold should be ensured that the card clock does not stop
in the middle of a block of data being transferred from the card to the
Host. Specially, clock stop is allowed in fast transfer such as HS200
or SDR104 mode. And so, it should be enabled.
Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Tested-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This change helps to choose msize, rx_watermark and tx_watermark
depending on block size for IDMAC mode. For SDIO block size can be
variable, so if these values are set incorrectly, card clock may stop.
Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Tested-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Both f_max and f_min will be informed for core layer to request
valid clock rate. But current setting from 'host->bus_hz' may
not represent the max/min frequency properly. Even if host can
actually support high speed than bus_hz, core layer will not
request clock rate over bus_hz. Basically, f_max/f_min can be set
with the values according to spec. And then host will make its best
effort to meet the rate.
Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Tested-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
'supports-highspeed' is not one of the quirks but is a capability.
So, it's removed from quirks.
Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Tested-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
As host controller can support eMMC's HS200 mode at 1.8V or 1.2V,
these capability will be added.
Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Tested-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
For the speed modes HS200 and SDR104, tuning is needed to determine the
correct sampling point. Actual tuning procedure is provided by specific
host controller driver. This patch defines the tuning command and
tuning data. Additionally, 'struct dw_mci_slot' is moved to header
file to consider the extensive usages in driver.
Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Tested-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Current platform specific private data initialization call
dw_mci_exynos_priv_init() can be used to do platform specific
initialization of SMU and others in future. So the drv_data->init
call has moved to dw_mci_probe().
Signed-off-by: Yuvaraj Kumar C D <yuvaraj.cd@samsung.com>
Tested-by: Alim Akhtar <alim.akhtar@samsung.com>
Tested-by: Jaehoon Chung <jh80.chung@samsung.com>
Acked-by: Seungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
The TMOUT register is set to 0xffffffff at probe time but isn't
set after suspend/resume. Add an init of this value.
No problems were observed without this (it will also be set in
__dw_mci_start_request if there is data to send), but it makes the
register dump before and after suspend cleaner.
Signed-off-by: Doug Anderson <dianders@chromium.org>
Acked-by: Seungwon Jeon <tgih.jun@samsung.com>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Previously the dw_mmc driver would ignore any requests to disable the
card's clock. This doesn't seem like a good thing in general, but had
one extra bad side effect in the following situation:
* mmc core would set clk to 400kHz at boot time while scanning
* mmc core would set clk to 0 since no card, but it would be ignored.
* suspend to ram and resume; clocks in the dw_mmc IP block are now 0
but dw_mmc thinks that they're 400kHz (it ignored the set to 0).
* insert card
* mmc core would set clk to 400kHz which would be considered a no-op.
Note that if there is no card in the slot and we do a suspend/resume
cycle, we _do_ still end up with differences in a dw_mmc register
dump, but the differences are clock related and we've got the clock
disabled both before and after, so this should be OK.
Signed-off-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
The MMC subsystem handles looking for a card at probe time. Queuing up our
own can race with the rest of the MMC subsystem and cause problems if we
get unlucky with timing. Just remove driver own detection triggering. While
progressing the request from 'mmc_rescan', if 'dw_mci_work_routine_card'
routine is activated, it will cancel the current request. The problem case
is that 'mmc_rescan' is prior to 'dw_mci_work_routine_card' from host own.
Specifically, the following message shows the detection problem in driver's
probing. It would get an err -123 (-ENOMEDIUM) during probe.
[ 4.216595] dwmmc_exynos 12210000.dwmmc1: Using internal DMA controller.
[ 4.395935] dwmmc_exynos 12210000.dwmmc1: Version ID is 250a
[ 4.401948] dwmmc_exynos 12210000.dwmmc1: DW MMC controller at irq 108, 64 bit host data width, 64 deep fifo
[ 4.424430] dwmmc_exynos 12210000.dwmmc1: sdr0 mode (irq=108, width=0)
[ 4.453975] dwmmc_exynos 12210000.dwmmc1: sdr0 mode (irq=108, width=0)
[ 4.459592] mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot req 400000Hz, actual 400000HZ div = 125)
[ 4.484258] dwmmc_exynos 12210000.dwmmc1: 1 slots initialized
[ 4.485406] dwmmc_exynos 12210000.dwmmc1: sdr0 mode (irq=108, width=0)
[ 4.487606] dwmmc_exynos 12210000.dwmmc1: sdr0 mode (irq=108, width=0)
[ 4.489794] dwmmc_exynos 12210000.dwmmc1: sdr0 mode (irq=108, width=0)
[ 4.509757] mmc1: error -123 whilst initialising SDIO card
Signed-off-by: Doug Anderson <dianders@chromium.org>
Acked-by: Seungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Core:
- Support Allocation Units 8MB-64MB in SD3.0, previous max was 4MB.
- The slot-gpio helper can now handle GPIO debouncing card-detect.
- Read supported voltages from DT "voltage-ranges" property.
Drivers:
- dw_mmc: Add support for ARC architecture, and support exynos5420.
- mmc_spi: Support CD/RO GPIOs.
- sh_mobile_sdhi: Add compatibility for more Renesas SoCs.
- sh_mmcif: Add DT support for DMA channels.
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Merge tag 'mmc-updates-for-3.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc
Pull MMC updates from Chris Ball:
"MMC highlights for 3.12:
Core:
- Support Allocation Units 8MB-64MB in SD3.0, previous max was 4MB.
- The slot-gpio helper can now handle GPIO debouncing card-detect.
- Read supported voltages from DT "voltage-ranges" property.
Drivers:
- dw_mmc: Add support for ARC architecture, and support exynos5420.
- mmc_spi: Support CD/RO GPIOs.
- sh_mobile_sdhi: Add compatibility for more Renesas SoCs.
- sh_mmcif: Add DT support for DMA channels"
* tag 'mmc-updates-for-3.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc: (50 commits)
Revert "mmc: tmio-mmc: Remove .set_pwr() callback from platform data"
mmc: dw_mmc: Add support for ARC
mmc: sdhci-s3c: initialize host->quirks2 for using quirks2
mmc: sdhci-s3c: fix the wrong register value, when clock is disabled
mmc: esdhc: add support to get voltage from device-tree
mmc: sdhci: get voltage from sdhc host
mmc: core: parse voltage from device-tree
mmc: omap_hsmmc: use the generic config for omap2plus devices
mmc: omap_hsmmc: clear status flags before starting a new command
mmc: dw_mmc: exynos: Add a new compatible string for exynos5420
mmc: sh_mmcif: revision-specific CLK_CTRL2 handling
mmc: sh_mmcif: revision-specific Command Completion Signal handling
mmc: sh_mmcif: add support for Device Tree DMA bindings
mmc: sh_mmcif: move header include from header into .c
mmc: SDHI: add DT compatibility strings for further SoCs
mmc: dw_mmc-pci: enable bus-mastering mode
mmc: dw_mmc-pci: get resources from a proper BAR
mmc: tmio-mmc: Remove .set_pwr() callback from platform data
mmc: tmio-mmc: Remove .get_cd() callback from platform data
mmc: sh_mobile_sdhi: Remove .set_pwr() callback from platform data
...
In (1fb5f68 mmc: dw_mmc: Don't loop when handling an interrupt), the
code for handling DW_MCI_QUIRK_IDMAC_DTO became dead code. Move it to
where it ought to live.
Found by code inspection and compile-tested only--I don't know of any
boards that need DW_MCI_QUIRK_IDMAC_DTO.
Signed-off-by: Doug Anderson <dianders@chromium.org>
Acked-by: Seungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Use regulator_get_optional() to tell the core that requests for regulators
can fail in a real system.
Signed-off-by: Mark Brown <broonie@linaro.org>
Acked-by: Chris Ball <cjb@laptop.org>
Acked-by: Seungwon Jeon <tgih.jun@samsung.com>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
As of now we rely on code outside of the driver to set the ciu clock
frequency. There's no reason to do that. Add support for setting up
the clock in the driver during probe.
Signed-off-by: Doug Anderson <dianders@chromium.org>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
It is possible to specify a regulator that should be turned on when
dw_mmc is probed. At the moment dw_mmc will fail to use the regulator
properly if the regulator probes after dw_mmc. Fix this problem by
honoring EPROBE_DEFER.
At the same time move the regulator code out of the slot init code.
We only specify one regulator for the whole device and other parts of
the code (like suspend/resume) assume that the regulator has only been
enabled once.
Signed-off-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
At Interrupt status register, Bit9 is Data Read Timeout.
But we used macro name as the DTO. It could be confused with the
Data Transfer Over(DTO)-Bit[3].
It's clearly that is changed the DRTO instead of DTO.
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: James Hogan <james.hogan@imgtec.com>
Acked-by: Seungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Fix to return -ENOMEM in alloc workqueue error case instead
of 0, as done elsewhere in this function.
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Acked-by: Seungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
With device core now able to setup the default pin configuration,
the pin configuration code based on the deprecated Samsung specific
gpio bindings is removed.
Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Doug Anderson <dianders@chromium.org>
Tested-by: Doug Anderson <dianders@chromium.org>
Acked-by: Seungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
regulator_enable() is declared with __must_check attribute.
Hence check the return value to ensure that the regulator is enabled.
Fixes the following warning:
drivers/mmc/host/dw_mmc.c:2461:19: warning:
ignoring return value of ‘regulator_enable’, declared with attribute
warn_unused_result [-Wunused-result]
drivers/mmc/host/dw_mmc.c: In function ‘dw_mci_init_slot’:
drivers/mmc/host/dw_mmc.c:1994:19: warning:
ignoring return value of ‘regulator_enable’, declared with attribute
warn_unused_result [-Wunused-result]
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Acked-by: Seungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
When card is power-on/off, need to control the power-enable register.
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: James Hogan <james.hogan@imgtec.com>
Acked-by: Seungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
mci_writew causes a failure of fifo access for 64-bit.
mci_writeq is correct.
Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Commit f9c2a0dc42
"mmc: dw_mmc: Fix PIO mode with support of highmem" introduced
a regression since v3.2 making the mmc_test hang on test #13
with a "Data starvation by host timeout" interrupt.
This is because, sg_mapping_iter is used to iterate through the
data which spans on multiple pages. The problem is detected on
unaligned data submission where the code previously checked for
!(sg_next(host->sg)) which is true because we only have a single
scatter/gather list which then expands to multiple pages.
Therefore, the driver incorrectly assumed that this was the last
list item and submitted unaligned data to the mmc device. This
overflowed the FIFO on the device before all the data were written
to it. The code was fixed to only submit unaligned data when we are
handling the last sg_miter item by checking whether we reached
the desired data length or not.
The patch was tested against mmc_test and all the tests passed.
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Acked-by: Seungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Previously, it was possible to add either 0 bytes or add nbytes
twice if we broke out of the outer loop and then carry on to the
"done" label. This is now fixed by adding the transferred bytes
right after the pull/pop operation
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Acked-by: Seungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
There is no reason to loop when handling an interrupt. The "if" clauses
will handle all of them sequentially. This also eliminates the extra loop
we used to take with no pending interrupts and we ended up breaking out
of the while loop.
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Acked-by: Seungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Doug Anderson