linux-toradex.git/drivers/mmc/core/core.c, branch v3.2.6

mmc: core: Fix deadlock when the CONFIG_MMC_UNSAFE_RESUME is not defined

2011-12-10T21:18:39+00:00

mmc_suspend_host() tries to claim host during suspend
and release it only when the bus suspend operation is
compeleted. If CONFIG_MMC_UNSAFE_RESUME is defined and
the host is flagged as removable, mmc_suspend_host()
tries to remove the card. In this process, the file system
sync can get blocked trying to acquire host which is already
claimed by mmc_suspend_host() causing deadlock.

Fix this deadlock by releasing host before ->remove() is called.

Signed-off-by: Sujit Reddy Thumma 
Acked-by: Ulf Hansson 
Acked-by: Linus Walleij 
Signed-off-by: Chris Ball

mmc: core: Fix typo at mmc_card_sleep

2011-12-10T21:18:37+00:00

Fix wrong bus_ops->sleep check.  (This isn't expected to have real-world
consequences, because the mmc core always defines both 'awake' and
'sleep' ops.)

Signed-off-by: Kyungmin Park 
Signed-off-by: Chris Ball

mmc: core: Fix power_off_notify during suspend

2011-12-10T21:18:36+00:00

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: Girish K S 
Signed-off-by: Chris Ball

mmc: core: Add quirk for long data read time

2011-12-10T21:18:35+00:00

Adds a quirk that sets the data read timeout to a fixed value instead
of relying on the information in the CSD. The timeout value chosen
is 300ms since that has proven enough for the problematic cards found,
but could be increased if other cards require this.

This patch also enables this quirk for certain Micron cards known to
have this problem.

Signed-off-by: Stefan Nilsson XK 
Signed-off-by: Ulf Hansson 
Acked-by: Linus Walleij 
Cc: 
Signed-off-by: Chris Ball

mmc: core: Prevent too long response times for suspend

2011-10-26T20:32:31+00:00

While trying to suspend the mmc host there could still be
ongoing requests that we need to wait for. At the same time
a device driver must respond to a suspend request rather quickly.

Instead of potentially wait "forever" by claiming the host we now
"try" to claim the host instead. If it fails, -EBUSY is returned.

Signed-off-by: Ulf Hansson 
Reviewed-by: Sujit Reddy Thumma 
Acked-by: Linus Walleij 
Signed-off-by: Chris Ball

mmc: core: support HPI send command

2011-10-26T20:32:29+00:00

HPI command is defined in eMMC4.41.
This feature is important for eMMC4.5 devices.

Signed-off-by: Jaehoon Chung 
Signed-off-by: Chris Ball

mmc: core: Add cache control for eMMC4.5 device

2011-10-26T20:32:28+00:00

This patch adds cache feature of eMMC4.5 Spec.
If device supports cache capability, host can utilize some specific
operations.

Signed-off-by: Seungwon Jeon 
Signed-off-by: Jaehoon Chung 
Signed-off-by: Chris Ball

mmc: core: new discard feature support at eMMC v4.5

2011-10-26T20:32:27+00:00

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: Kyungmin Park 
Signed-off-by: Jaehoon Chung 
Signed-off-by: Chris Ball

mmc: core: mmc sanitize feature support for v4.5

2011-10-26T20:32:26+00:00

In the v4.5, there's no secure erase & trim support.
Instead it supports the sanitize feature.

Signed-off-by: Kyungmin Park 
Signed-off-by: Jaehoon Chung 
Signed-off-by: Chris Ball

mmc: core: Add Power Off Notify Feature eMMC 4.5

2011-10-26T20:32:23+00:00

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: Girish K S 
Signed-off-by: Jaehoon Chung 
Signed-off-by: Chris Ball