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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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5
include/linux/mmc/host.h
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@@ -239,8 +239,13 @@ struct mmc_host {
unsigned int caps2; /* More host capabilities */
#define MMC_CAP2_BOOTPART_NOACC (1 << 0) /* Boot partition no access */
#define MMC_CAP2_POWEROFF_NOTIFY (1 << 2) /* Notify poweroff supported */
mmc_pm_flag_t pm_caps; /* supported pm features */
unsigned int power_notify_type;
#define MMC_HOST_PW_NOTIFY_NONE 0
#define MMC_HOST_PW_NOTIFY_SHORT 1
#define MMC_HOST_PW_NOTIFY_LONG 2
#ifdef CONFIG_MMC_CLKGATE
int clk_requests; /* internal reference counter */