Commit 4d223782 authored by Ulf Hansson's avatar Ulf Hansson Committed by Chris Ball
Browse files

mmc: core: Add MMC_CAP_RUNTIME_RESUME to resume at runtime_resume 



In some environments it is to prefer to postpone the resume of the card
device until runtime_resume is being carried out, since it will mean a
signficant decrease of the total system resume time.

The reason of the decreased resume time is simply because of the actual
re-initalization of the card, which typically takes hundreds of
milliseconds, is performed outside the resume sequence and wont thus
affect it.

For removable card, the detect work tries to re-detect the card to make
sure it is still present, as a part of that sequence the card will also
be runtime_resumed and thus also fully resumed.

For a non-removable card, typically a mmc blk request will trigger a
runtime_resume and thus fully resume the card. This also means the
first request will likely suffer from an inital latency since the
re-initialization of the card needs to be performed.

Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: default avatarChris Ball <cjb@laptop.org>
parent 0cb403a2

drivers/mmc/core/mmc.c

+7 −5
Original line number Diff line number Diff line
@@ -1577,11 +1577,13 @@ static int mmc_shutdown(struct mmc_host *host) 
 */

static int mmc_resume(struct mmc_host *host)

{

	int err;

	int err = 0;



	if (!(host->caps & MMC_CAP_RUNTIME_RESUME)) {

		err = _mmc_resume(host);

		pm_runtime_set_active(&host->card->dev);

		pm_runtime_mark_last_busy(&host->card->dev);

	}

	pm_runtime_enable(&host->card->dev);



	return err;
@@ -1612,7 +1614,7 @@ static int mmc_runtime_resume(struct mmc_host *host) 
{

	int err;



	if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))

	if (!(host->caps & (MMC_CAP_AGGRESSIVE_PM | MMC_CAP_RUNTIME_RESUME)))

		return 0;



	err = _mmc_resume(host);

drivers/mmc/core/sd.c

+7 −5
Original line number Diff line number Diff line
@@ -1139,11 +1139,13 @@ out: 
 */

static int mmc_sd_resume(struct mmc_host *host)

{

	int err;

	int err = 0;



	if (!(host->caps & MMC_CAP_RUNTIME_RESUME)) {

		err = _mmc_sd_resume(host);

		pm_runtime_set_active(&host->card->dev);

		pm_runtime_mark_last_busy(&host->card->dev);

	}

	pm_runtime_enable(&host->card->dev);



	return err;
@@ -1174,7 +1176,7 @@ static int mmc_sd_runtime_resume(struct mmc_host *host) 
{

	int err;



	if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))

	if (!(host->caps & (MMC_CAP_AGGRESSIVE_PM | MMC_CAP_RUNTIME_RESUME)))

		return 0;



	err = _mmc_sd_resume(host);

include/linux/mmc/host.h

+1 −0
Original line number Diff line number Diff line
@@ -254,6 +254,7 @@ struct mmc_host { 
#define MMC_CAP_UHS_SDR50	(1 << 17)	/* Host supports UHS SDR50 mode */

#define MMC_CAP_UHS_SDR104	(1 << 18)	/* Host supports UHS SDR104 mode */

#define MMC_CAP_UHS_DDR50	(1 << 19)	/* Host supports UHS DDR50 mode */

#define MMC_CAP_RUNTIME_RESUME	(1 << 20)	/* Resume at runtime_resume. */

#define MMC_CAP_DRIVER_TYPE_A	(1 << 23)	/* Host supports Driver Type A */

#define MMC_CAP_DRIVER_TYPE_C	(1 << 24)	/* Host supports Driver Type C */

#define MMC_CAP_DRIVER_TYPE_D	(1 << 25)	/* Host supports Driver Type D */

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