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authorUlf Hansson <ulf.hansson@linaro.org>2013-10-10 19:22:23 +0400
committerChris Ball <cjb@laptop.org>2013-10-31 04:28:43 +0400
commit4d22378221bd0ed69c2e99408d31c108d72aeb80 (patch)
tree298044ec52b46b7de410e924d85508f0abadee16 /drivers/mmc
parent0cb403a227774f60f6f52137ca3618805498c4e6 (diff)
downloadlinux-4d22378221bd0ed69c2e99408d31c108d72aeb80.tar.xz
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>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/core/mmc.c12
-rw-r--r--drivers/mmc/core/sd.c12
2 files changed, 14 insertions, 10 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 7f5dc26865de..f631f5a9bf79 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -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);
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 447fa8e9f322..6f42050b7ccc 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -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);