diff options
| author | Sujit Reddy Thumma <sthumma@codeaurora.org> | 2013-06-19 20:15:37 +0530 |
|---|---|---|
| committer | Subhash Jadavani <subhashj@codeaurora.org> | 2016-05-27 10:28:44 -0700 |
| commit | 0c196acfcbb766a07151cfae76c2318eca661c40 (patch) | |
| tree | 6a5372ed2599b99f74486511e79bbde34fb427fd /include | |
| parent | 573858a3b64167f27a2968dbebf661007b324439 (diff) | |
mmc: sdhci: Defer release of CPU DMA PM QoS vote in high load cases
PM QoS vote of default value mean that the CPU is allowed to move
into deepest low power mode whenever possible. Currently, if there
are back-to-back MMC requests, with a short delay, the PM QoS vote
to default value is done immediately which cause the immediate
request to have high latency as the CPU might have idle'd and moved
to deepest low power mode. To avoid this defer the PM QoS vote till
a defined timeout (pm_qos_timeout_us), so that back-to-back requests
may not suffer from additional latencies.
In addition, if the load on MMC is low, the additional latency may be
sustainable. Hence, aggressively release the vote in order to achieve
additional power savings.
CRs-Fixed: 501712
Change-Id: I82166b0ce9416eb0d519f7da26e5a96956093cb2
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
[subhashj@codeaurora.org: fixed minor merge conflict and fixed
compilation errors]
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/mmc/host.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h index 2b6159a85a15..1939cd47b3aa 100644 --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -79,6 +79,12 @@ struct mmc_ios { #define MMC_SET_DRIVER_TYPE_D 3 }; +/* states to represent load on the host */ +enum mmc_load { + MMC_LOAD_HIGH, + MMC_LOAD_LOW, +}; + struct mmc_host_ops { /* * 'enable' is called when the host is claimed and 'disable' is called @@ -150,6 +156,7 @@ struct mmc_host_ops { */ int (*multi_io_quirk)(struct mmc_card *card, unsigned int direction, int blk_size); + int (*notify_load)(struct mmc_host *, enum mmc_load); }; struct mmc_card; |