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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: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Ulf Hansson 2013-10-10 17:22:23 +02:00 committed by Chris Ball
parent 0cb403a227
commit 4d22378221
3 changed files with 15 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/mmc/core/mmc.c
View File

@ -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;
err = _mmc_resume(host);
pm_runtime_set_active(&host->card->dev);
pm_runtime_mark_last_busy(&host->card->dev);
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);

12
drivers/mmc/core/sd.c
View File

@ -1139,11 +1139,13 @@ out:
*/
static int mmc_sd_resume(struct mmc_host *host)
{
int err;
int err = 0;
err = _mmc_sd_resume(host);
pm_runtime_set_active(&host->card->dev);
pm_runtime_mark_last_busy(&host->card->dev);
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);

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

@ -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 */