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| author | Adrian Hunter <adrian.hunter@intel.com> | 2015-05-07 13:10:12 +0300 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2015-06-01 09:06:53 +0200 |
| commit | dfa13ebbe3340e538b988f5608efd9ff2ca7fc35 (patch) | |
| tree | c2797cd4a3ea5a8f041790b8687005de608b5a3c /include | |
| parent | 59d22309c46e807cef8d892316f6d08b715d6652 (diff) | |
| download | op-kernel-dev-dfa13ebbe3340e538b988f5608efd9ff2ca7fc35.zip op-kernel-dev-dfa13ebbe3340e538b988f5608efd9ff2ca7fc35.tar.gz | |
mmc: host: Add facility to support re-tuning
Currently, there is core support for tuning during
initialization. There can also be a need to re-tune
periodically (e.g. sdhci) or to re-tune after the
host controller is powered off (e.g. after PM
runtime suspend / resume) or to re-tune in response
to CRC errors.
The main requirements for re-tuning are:
- ability to enable / disable re-tuning
- ability to flag that re-tuning is needed
- ability to re-tune before any request
- ability to hold off re-tuning if the card is busy
- ability to hold off re-tuning if re-tuning is in
progress
- ability to run a re-tuning timer
To support those requirements 7 members are added to struct
mmc_host:
unsigned int can_retune:1; /* re-tuning can be used */
unsigned int doing_retune:1; /* re-tuning in progress */
unsigned int retune_now:1; /* do re-tuning at next req */
int need_retune; /* re-tuning is needed */
int hold_retune; /* hold off re-tuning */
unsigned int retune_period; /* re-tuning period in secs */
struct timer_list retune_timer; /* for periodic re-tuning */
need_retune is an integer so it can be set without needing
synchronization. hold_retune is a integer to allow nesting.
Various simple functions are provided to set / clear those
variables.
Subsequent patches take those functions into use.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/mmc/host.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h index b5bedae..f471193 100644 --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -12,6 +12,7 @@ #include <linux/leds.h> #include <linux/mutex.h> +#include <linux/timer.h> #include <linux/sched.h> #include <linux/device.h> #include <linux/fault-inject.h> @@ -321,10 +322,18 @@ struct mmc_host { #ifdef CONFIG_MMC_DEBUG unsigned int removed:1; /* host is being removed */ #endif + unsigned int can_retune:1; /* re-tuning can be used */ + unsigned int doing_retune:1; /* re-tuning in progress */ + unsigned int retune_now:1; /* do re-tuning at next req */ int rescan_disable; /* disable card detection */ int rescan_entered; /* used with nonremovable devices */ + int need_retune; /* re-tuning is needed */ + int hold_retune; /* hold off re-tuning */ + unsigned int retune_period; /* re-tuning period in secs */ + struct timer_list retune_timer; /* for periodic re-tuning */ + bool trigger_card_event; /* card_event necessary */ struct mmc_card *card; /* device attached to this host */ @@ -513,4 +522,18 @@ static inline bool mmc_card_hs400(struct mmc_card *card) return card->host->ios.timing == MMC_TIMING_MMC_HS400; } +void mmc_retune_timer_stop(struct mmc_host *host); + +static inline void mmc_retune_needed(struct mmc_host *host) +{ + if (host->can_retune) + host->need_retune = 1; +} + +static inline void mmc_retune_recheck(struct mmc_host *host) +{ + if (host->hold_retune <= 1) + host->retune_now = 1; +} + #endif /* LINUX_MMC_HOST_H */ |
