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authorGirish K S <girish.shivananjappa@linaro.org>2011-10-13 12:04:16 +0530
committerChris Ball <cjb@laptop.org>2011-10-26 16:32:23 -0400
commitbec8726abc72bf30d2743a722aa37cd69e7a0580 (patch)
treeeed4a3c441ff64f5719b021fce419de0fc5196d9 /drivers/mmc/host
parent326adda53a50ece492c3edaa60afc26fba5e3232 (diff)
downloadlinux-bec8726abc72bf30d2743a722aa37cd69e7a0580.tar.bz2
mmc: core: Add Power Off Notify Feature eMMC 4.5
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>
Diffstat (limited to 'drivers/mmc/host')
-rw-r--r--drivers/mmc/host/sdhci.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 2cc3ffa7d766..6d8eea323541 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -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;