This patch fixes up the broken suspend sequence for eMMC with sleep
support. Additionally it reworks the eMMC4.5 Power Off Notification
feature so it fits together with the existing sleep feature.

The CMD0 based re-initialization of the eMMC at resume is re-introduced
to maintain compatiblity for devices using sleep.

A host shall use MMC_CAP2_POWEROFF_NOTIFY to enable the Power Off
Notification feature. We might be able to remove this cap later on,
if we think that Power Off Notification always is preferred over
sleep, even if the host is not able to cut the eMMC VCCQ power.
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: NSaugata Das <saugata.das@linaro.org>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

Enable eMMC background operations (BKOPS) feature.

If URGENT_BKOPS is set after a response, note that BKOPS are required.
Immediately run BKOPS if required.  Read/write operations should be
requested during BKOPS(LEVEL-1), then issue HPI to interrupt the
ongoing BKOPS and service the foreground operation.
(This patch only controls the LEVEL2/3.)

When repeating the writing 1GB data, at a certain time, performance is
decreased.  At that time, card triggers the Level-3 or Level-2.  After
running bkops, performance is recovered.

Future considerations:
 * Check BKOPS_LEVEL=1 and start BKOPS in a preventive manner.
 * Interrupt ongoing BKOPS before powering off the card.
 * How do we get BKOPS_STATUS value (periodically send ext_csd command)?
 * If using periodic bkops, also consider runtime_pm control.
Signed-off-by: NJaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: NKyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: NKonstantin Dorfman <kdorfman@codeaurora.org>
Reviewed-by: NMaya Erez <merez@codeaurora.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

Add a call to mmc_set_signal_voltage() to set signal voltage to 3.3v in
mmc_power_up so that we do not need to touch signal voltage setting in
mmc/sd/sdio init functions and rescan function.

For mmc/sd cards, when doing a suspend/resume cycle, consider the unsafe
resume case, the card will lose its power and when powered on again, we
will set signal voltage to 3.3v in mmc_power_up before its resume function
gets called, which will re-init the card.

And for sdio cards, when doing a suspend/resume cycle, consider the unsafe
resume case, the card will either lose its power or not depending on if it
wants to wakeup the host. If power is not maintained, it is the same case as
mmc/sd cards. If power is maintained, mmc_power_up will not be called and
the card's signal voltage will remain at the last setting.
Signed-off-by: NAaron Lu <aaron.lu@amd.com>
Tested-by: NVenkatraman S <svenkatr@ti.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

This reverts commit 3d93576e(skip card initialization if
power class selection fails).
Problem has been reported when this is used with eMMC4.41
card with Tegra Platform. Till the issue is root caused,
bus width selection failure should not be treated as fatal.
Reported-by: NMarc Dietrich <marvin24@gmx.de>
Signed-Off-by: NVenkatraman S <svenkatr@ti.com>
CC: Ulf Hansson <ulf.hansson@stericsson.com>
CC: Subhash Jadavani <subhashj@codeaurora.org>
CC: Saugata Das <saugata.das@linaro.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

When mmc_host is not spi mode, mmc/sd is doing mmc_deselect_cards().
mmc_deselect_cards could be returned error.
If returned error, we can know something wrong when enter suspend.
Signed-off-by: NJaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: NKyungmin Park <kyungmin.park@samsung.com>
Acked-by: NUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

This patch adds support for large sector size of 4KB by disabling
emulation.  This patch passes eMMC DATA_SECTOR_SIZE as the logical
block size during mmc_blk_alloc_req.

In order to use this patch for 4KB sector size, ensure that
USE_NATIVE_SECTOR is enabled, partition table is 4KB sector size
aligned and file system block and sector size are 4KB multiples.
Signed-off-by: NSaugata Das <saugata.das@linaro.org>
Reviewed-by: NSubhash Jadavani <subhashj@codeaurora.org>
Reviewed-by: NNamjae Jeon <linkinjeon@gmail.com>
Reviewed-by: NSubhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

bus_width is passed to the function and when 0 (MMC_BUS_WIDTH_1)
will cause the function to return. So in in the second test it
definitely is different from 0, and the third test is redundant.
Signed-off-by: NPhilippe De Swert <philippedeswert@gmail.com>
Reviewed-by: NNamjae Jeon <linkinjeon@gmail.com>
Acked-by: NPhilip Rakity <prakity@marvell.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

With current implementation of power class selection,
mmc_select_powerclass() should never fail. So treat any error
returned by this function as serious enough to skip the card
initialization.
Signed-off-by: NSubhash Jadavani <subhashj@codeaurora.org>
Reviewed-by: NNamjae Jeon <linkinjeon@gmail.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

Currently only 1.2V is treated for HS200 mode. If the host has only
1.8V I/O capability not 1.2V, mmc_set_signal_voltage can't be called
for 1.8V HS200. EXT_CSD_CARD_TYPE_SDR_1_8V needs to be considered.
Signed-off-by: NSeungwon Jeon <tgih.jun@samsung.com>
Reviewed-by: NSubhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

Current implementation decides the card type exclusively. Even though
eMMC device can support both HS200 and DDR mode, card type will be
set only for HS200. If the host doesn't support HS200 but has DDR
capability, then DDR mode can't be selected.
Signed-off-by: NSeungwon Jeon <tgih.jun@samsung.com>
Reviewed-by: NSubhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

mmc_select_powerclass() function returns error if eMMC
VDD level supported by host is between 2.7v to 3.2v.

According to eMMC specification, valid voltage for high
voltage cards is 2.7v to 3.6v. This patch ensures that
2.7v to 3.6v VDD range is treated as valid range.

Also, failure to set the power class shouldn't be treated
as fatal error because even if setting the power class
fails, card can still work in default power class.
If mmc_select_powerclass() returns error, just print
the warning message and go ahead with rest of the card
initialization.
Signed-off-by: NSubhash Jadavani <subhashj@codeaurora.org>
Acked-by: NGirish K S <girish.shivananjappa@linaro.org>
Reviewed-by: NNamjae Jeon <linkinjeon@gmail.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

Let drivers specify the use of high-capacity erase size.
Signed-off-by: NAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

This patch fixes following issues when HS200 is enabled:

1. If executing_tuning() host ops is called without mmc_host_clk_hold(),
   card clocks might get turned off (if MMC_CLK_GATING is enabled)
   while execute_tuning() is in progress. So this patch makes sure
   that execute_tuning() is called with mmc_host_clk_hold().

2. If host timing mode is set to HS200 mode, there should not be
   any communication with the card until execute_tuning() is completed.
   But there is a chance that CMD6 might be sent to enable set HPI_EN
   (of HPI_MGMT field in EXT_CSD) before execute_tuning() is called.
   So this patch moves this operation after execute_tuning() is completed.
Signed-off-by: NSubhash Jadavani <subhashj@codeaurora.org>
Reviewed-by: girish.shivananjappa@linaro.org
Signed-off-by: NChris Ball <cjb@laptop.org>

MMC-4.5 data tag feature will be used to store the file system meta-data
in the tagged region of eMMC. This will improve the write and subsequent
read transfer time for the meta data.
Signed-off-by: NSaugata Das <saugata.das@linaro.org>
Tested-by: NVenkatraman S <svenkatr@ti.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

Even if cards supports 1.8V I/O voltage those should anyway be
initialized at 3.3V I/O according to (e)MMC, SD and SDIO specs.
Some eMMC and embedded SDIO devices are able to be initialized
at 1.8V as well, but it is better to be safe.

Do note that initialization in this context means that the card
has been completely powered off, otherwise the card will remain
at the last I/O voltage level that were negotitiated.

Due to the above being taken care of the suspend/resume issues
for UHS-I SD-cards has been fixed.
Signed-off-by: NUlf Hansson <ulf.hansson@stericsson.com>
Acked-by: NPhilip Rakity <prakity@marvell.com>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Tested-by: NSubhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

Found this issue during code review. Actually, there are two issues which
both compensate together in lucky case.  In unlucky case the bus width
probing might not work as expected.
Signed-off-by: NJurgen Heeks <jurgen.heeks@nokia.com>
Reviewed-by: NNamjae Jeon <linkinjeon@gmail.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

Modified the mmc_poweroff to resume before sending the poweroff
notification command. In sleep mode only AWAKE and RESET commands are
allowed, so before sending the poweroff notification command resume from
sleep mode and then send the notification command.

PowerOff Notify is tested on a Synopsis Designware Host Controller
(eMMC 4.5). The suspend to RAM and resume works fine.
Signed-off-by: NGirish K S <girish.shivananjappa@linaro.org>
Tested-by: NGirish K S <girish.shivananjappa@linaro.org>
Reviewed-by: NSaugata Das <saugata.das@linaro.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

This patch fixes the failure of low speed mmc card detection.
Signed-off-by: NGirish K S <girish.shivananjappa@linaro.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

This patch adds the support of the HS200 bus speed for eMMC 4.5 devices.
The eMMC 4.5 devices have support for 200MHz bus speed. The function
prototype of the tuning function is modified to handle the tuning
command number which is different in sd and mmc case.
Signed-off-by: NGirish K S <girish.shivananjappa@linaro.org>
Signed-off-by: NPhilip Rakity <prakity@marvell.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

Turning the cache off implies flushing cache which doesn't define
maximum timeout unlike cache-on. This patch will apply the generic
CMD6 timeout only for cache-on. Additionally the kernel message is
added for checking failure case of cache-on.
Signed-off-by: NSeungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

This patch fixes the wrong comparison before setting the interface
voltage in DDR mode.

The assignment to the variable ddr before comaprison is either
ddr = MMC_1_2V_DDR_MODE; or ddr == MMC_1_8V_DDR_MODE. But the comparison
is done with the extended csd value if ddr == EXT_CSD_CARD_TYPE_DDR_1_2V.
Signed-off-by: NGirish K S <girish.shivananjappa@linaro.org>
Acked-by: NSubhash Jadavani <subhashj@codeaurora.org>
Acked-by: NPhilip Rakity <prakity@marvell.com>
Cc: <stable@kernel.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

Enable boot partitions to be read-only locked until next power on via
a sysfs entry. There will be one sysfs entry for each boot partition:

/sys/block/mmcblkXbootY/ro_lock_until_next_power_on

Each boot partition is locked by writing 1 to its file.
Signed-off-by: NJohan Rudholm <johan.rudholm@stericsson.com>
Signed-off-by: NJohn Beckett <john.beckett@stericsson.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

Add a function mmc_detect_card_removed() which upper layers can use to
determine immediately if a card has been removed. This function should
be called after an I/O request fails so that all queued I/O requests
can be errored out immediately instead of waiting for the card device
to be removed.
Signed-off-by: NAdrian Hunter <adrian.hunter@intel.com>
Acked-by: NSujit Reddy Thumma <sthumma@codeaurora.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

The eMMC 4.5 devices respond to only RESET and AWAKE command in the
sleep state. Hence the mmc switch command to notify power off state
should be sent before the device enters sleep state.

This patch fixes the same.
Signed-off-by: NGirish K S <girish.shivananjappa@linaro.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

This patch skips the setting of the power notify state variable
for non eMMC 4.5 devices. Also fixes the problem of omap_hsmmc
noisy/broken for suspend resume reported by Kevin Hilman.
Signed-off-by: NGirish K S <girish.shivananjappa@linaro.org>
Acked-by: NUlf Hansson <ulf.hansson@stericsson.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

Once the implicit use of module.h is prevented, these files will
fail to find the stat.h header content.

Fix up the implicit usage expectations in advance of the cleanup.
Signed-off-by: NPaul Gortmaker <paul.gortmaker@windriver.com>

Code cleanup, putting all eMMC 4.5 detection cases together.
This patch removes one if-statement and assembles all. And it also
removes variable initialization below else-statement -- all members
of card structure are already set to zero at card-init.
Signed-off-by: NSeungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

HPI command is defined in eMMC4.41.
This feature is important for eMMC4.5 devices.
Signed-off-by: NJaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

This patch adds cache feature of eMMC4.5 Spec.
If device supports cache capability, host can utilize some specific
operations.
Signed-off-by: NSeungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: NJaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

This patch will apply the generic CMD6 timeout to switch command
for power class.
Signed-off-by: NSeungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

MMC v4.5 supports the DISCARD feature (CMD38).  It's different from
trim and there's no check bit.  Currently it's only supported at v4.5.
Signed-off-by: NKyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: NJaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

This patch adds support for the power off notify feature, available in
eMMC 4.5 devices. If the host has support for this feature, then the
mmc core will notify the device by setting the POWER_OFF_NOTIFICATION
byte in the extended csd register with a value of 1 (POWER_ON).

For suspend mode short timeout is used, whereas for the normal poweroff
long timeout is used.
Signed-off-by: NGirish K S <girish.shivananjappa@linaro.org>
Signed-off-by: NJaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

All the files using printk function for displaying kernel messages
in the mmc driver have been replaced with corresponding macro.
Signed-off-by: NGirish K S <girish.shivananjappa@linaro.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

EXT_CSD[248] includes the default maximum timeout for CMD6.
This field is added at eMMC4.5 Spec. And it can be used for default
timeout except for some operations which don't define the timeout
(i.e. background operation, sanitize, flush cache) in eMMC4.5 Spec.
Signed-off-by: NSeungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: NJaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

It allows gerneral purpose partitions in MMC Device.  And I try to simply
make mmc_blk_alloc_parts using mmc_part structure suggested by Andrei
Warkentin.  After patching, we see general purpose partitions like this:
> cat /proc/partitions
          179 0 847872 mmcblk0
          179 192 4096 mmcblk0gp3
          179 160 4096 mmcblk0gp2
          179 128 4096 mmcblk0gp1
          179 96  1052672 mmcblk0gp0
          179 64  1024 mmcblk0boot1
          179 32  1024 mmcblk0boot0
Signed-off-by: NNamjae Jeon <linkinjeon@gmail.com>
Acked-by: NAndrei Warkentin <awarkentin@vmware.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

f39b2dd9 ("mmc: core: Bus width testing needs to handle suspend/resume")
added code to only compare read-only ext_csd fields in bus width testing
code, yet it's comparing some fields that are never set.

The affected fields are ext_csd.raw_erased_mem_count and
ext_csd.raw_partition_support.
Signed-off-by: NAndrei Warkentin <andrey.warkentin@gmail.com>
Acked-by: NPhilip Rakity <prakity@marvell.com>
Cc: <stable@kernel.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

This patch adds the power class selection feature available for mmc
versions 4.0 and above.  During the enumeration stage before switching
to the lower data bus, check if the power class is supported for the
current bus width. If the power class is available then switch to the
power class and use the higher data bus. If power class is not supported
then switch to the lower data bus in a worst case.
Signed-off-by: NGirish K S <girish.shivananjappa@linaro.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

eMMC's may have a hardware reset line.  This patch provides a
host controller operation to implement hardware reset and
a function to reset and reinitialize the card.  Also, for MMC,
the reset is always performed before initialization.

The host must set the new host capability MMC_CAP_HW_RESET
to enable hardware reset.
Signed-off-by: NAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

Earlier all cards where initiated with bus mode set as OPENDRAIN, and then
later switched to PUSHPULL. According to the MMC/SD/SDIO specifications
only MMC cards use OPENDRAIN during init. For both SD and SDIO the bus
mode shall be PUSHPULL before attempting to init the card.

The consequence of having incorrect bus mode can lead to not being able
to detect the card. Therefore the default behavior have now been changed
to PUSHPULL in mmc_power_up, and will only be temporarily switched when
trying to attach or init a MMC card.
Signed-off-by: NStefan Nilsson XK <stefan.xk.nilsson@stericsson.com>
Signed-off-by: NUlf HANSSON <ulf.hansson@stericsson.com>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

During a rescan operation mmc_attach(sd|mmc|sdio) functions are
called. The error handling in these function can trigger a detach
of the bus, which also meant a power off. This is not notified by
the rescan operation which then continues to the next attach function.

If a power off has been done, the framework must never send any
new commands to the host driver, without first doing a new power up.
This will most likely trigger any host driver to hang.

Moving power off out of detach and instead handle power off
separately when it is actually needed, solves the issue.
Signed-off-by: NUlf Hansson <ulf.hansson@stericsson.com>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Cc: <stable@kernel.org>
Signed-off-by: NChris Ball <cjb@laptop.org>