A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-14 08:36:12 -04:00
Code Issues Projects Releases Packages Wiki Activity

UPSTREAM: mmc: host: sdhci: Add a variable to defer to complete requests if needed

Browse source 
When using the host software queue, it will trigger the next request in
irq handler without a context switch. But the sdhci_request() can not be
called in interrupt context when using host software queue for some host
drivers, due to the get_cd() ops can be sleepable.

But for some host drivers, such as Spreadtrum host driver, the card is
nonremovable, so the get_cd() ops is not sleepable, which means we can
complete the data request and trigger the next request in irq handler
to remove the context switch for the Spreadtrum host driver.

As suggested by Adrian, we should introduce a request_atomic() API to
indicate that a request can be called in interrupt context to remove
the context switch when using mmc host software queue. But this should
be done in another thread to convert the users of mmc host software queue.
Thus we can introduce a variable in struct sdhci_host to indicate that
we will always to defer to complete requests when using the host software
queue.

bug: 151514181
Suggested-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Baolin Wang <baolin.wang7@gmail.com>
Link: https://lore.kernel.org/r/e693e7a29beb3c1922b333f4603ea81f43d5c5b1.1581478568.git.baolin.wang7@gmail.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
(cherry picked from commit 4730831c7d2e28c2e912b2c71066b9cf072f7625)
Change-Id: I81195265143e9bb8c850614950cdea0fe8032d6e
This commit is contained in:
Baolin Wang 2020-02-12 12:12:59 +08:00 • committed by Todd Kjos
commit 52f4445674
2 changed files with 2 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

2
drivers/mmc/host/sdhci.c
View file

@ -3033,7 +3033,7 @@ static inline bool sdhci_defer_done(struct sdhci_host *host,
{
struct mmc_data *data = mrq->data;
return host->pending_reset ||
return host->pending_reset || host->always_defer_done ||
((host->flags & SDHCI_REQ_USE_DMA) && data &&
data->host_cookie == COOKIE_MAPPED);
}

1
drivers/mmc/host/sdhci.h
View file

@ -535,6 +535,7 @@ struct sdhci_host {
bool pending_reset; /* Cmd/data reset is pending */
bool irq_wake_enabled; /* IRQ wakeup is enabled */
bool v4_mode; /* Host Version 4 Enable */
bool always_defer_done; /* Always defer to complete requests */
struct mmc_request *mrqs_done[SDHCI_MAX_MRQS]; /* Requests done */
struct mmc_command *cmd; /* Current command */