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mmc: core: Add Power Off Notify Feature eMMC 4.5

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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 <girish.shivananjappa@linaro.org>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Girish K S
2011-10-13 12:04:16 +05:30
committed by Chris Ball
parent 326adda53a
commit bec8726abc
6 changed files with 81 additions and 2 deletions
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9
drivers/mmc/host/sdhci.c
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@@ -2739,6 +2739,15 @@ int sdhci_add_host(struct sdhci_host *host)
if (caps[1] & SDHCI_DRIVER_TYPE_D)
mmc->caps |= MMC_CAP_DRIVER_TYPE_D;
/*
* If Power Off Notify capability is enabled by the host,
* set notify to short power off notify timeout value.
*/
if (mmc->caps2 & MMC_CAP2_POWEROFF_NOTIFY)
mmc->power_notify_type = MMC_HOST_PW_NOTIFY_SHORT;
else
mmc->power_notify_type = MMC_HOST_PW_NOTIFY_NONE;
/* Initial value for re-tuning timer count */
host->tuning_count = (caps[1] & SDHCI_RETUNING_TIMER_COUNT_MASK) >>
SDHCI_RETUNING_TIMER_COUNT_SHIFT;