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mmc: core: Add MMC_CAP2_FULL_PWR_CYCLE_IN_SUSPEND 

The commit 5a36d6bcdf ("mmc: core: Add DT-bindings for
MMC_CAP2_FULL_PWR_CYCLE") added the "full-pwr-cycle" property which
is possible to perform a full power cycle of the card at any time.

However, some environment (like r8a77951-salvator-xs) is possible
to perform a full power cycle of the card in suspend via firmware
(PSCI on arm-trusted-firmware). So, in worst case, since we are
not doing a graceful shutdown of the eMMC device (just cut VCCQ
while the eMMC is "sleeping") in suspend, it could lead to internal
data corruptions. So, add MMC_CAP2_FULL_PWR_CYCLE_IN_SUSPEND
to do a graceful shutdown which issues Power Off notification
before entering system suspend.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://lore.kernel.org/r/1594123122-13156-3-git-send-email-yoshihiro.shimoda.uh@renesas.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Yoshihiro Shimoda 2020-07-07 20:58:42 +09:00 committed by Ulf Hansson
parent ba26e91d9f
commit ec02760b63
3 changed files with 5 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/mmc/core/host.c
View File

@ -277,6 +277,8 @@ int mmc_of_parse(struct mmc_host *host)
host->caps |= MMC_CAP_SDIO_IRQ;
if (device_property_read_bool(dev, "full-pwr-cycle"))
host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE;
if (device_property_read_bool(dev, "full-pwr-cycle-in-suspend"))
host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE_IN_SUSPEND;
if (device_property_read_bool(dev, "keep-power-in-suspend"))
host->pm_caps |= MMC_PM_KEEP_POWER;
if (device_property_read_bool(dev, "wakeup-source") ||

3
drivers/mmc/core/mmc.c
View File

@ -2038,7 +2038,8 @@ static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
goto out;
if (mmc_can_poweroff_notify(host->card) &&
((host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) || !is_suspend))
((host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) || !is_suspend ||
(host->caps2 & MMC_CAP2_FULL_PWR_CYCLE_IN_SUSPEND)))
err = mmc_poweroff_notify(host->card, notify_type);
else if (mmc_can_sleep(host->card))
err = mmc_sleep(host);

1
include/linux/mmc/host.h
View File

@ -352,6 +352,7 @@ struct mmc_host {
#define MMC_CAP2_BOOTPART_NOACC (1 << 0) /* Boot partition no access */
#define MMC_CAP2_FULL_PWR_CYCLE (1 << 2) /* Can do full power cycle */
#define MMC_CAP2_FULL_PWR_CYCLE_IN_SUSPEND (1 << 3) /* Can do full power cycle in suspend */
#define MMC_CAP2_HS200_1_8V_SDR (1 << 5) /* can support */
#define MMC_CAP2_HS200_1_2V_SDR (1 << 6) /* can support */
#define MMC_CAP2_HS200 (MMC_CAP2_HS200_1_8V_SDR | \