diff options
| author | Ulf Hansson <ulf.hansson@linaro.org> | 2021-05-11 12:13:59 +0200 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2021-06-14 13:57:38 +0200 |
| commit | 130206a615a9831a65e186484a5a332f9f6d29c8 (patch) | |
| tree | 01f0ca845b0b686d463180fb942b4f84fdc90577 /include/linux/mmc | |
| parent | 34dd3ccccab0b93ebdf7ecde138814d121f72e98 (diff) | |
mmc: core: Add support for cache ctrl for SD cards
In SD spec v6.x the SD function extension registers for performance
enhancements were introduced. As a part of this an optional internal cache
on the SD card, can be used to improve performance.
The let the SD card use the cache, the host needs to enable it and manage
flushing of the cache, so let's add support for this.
Note that for an SD card supporting the cache it's mandatory for it, to
also support the poweroff notification feature. According to the SD spec,
if the cache has been enabled and a poweroff notification is sent to the
card, that implicitly also means that the card should flush its internal
cache. Therefore, dealing with cache flushing for REQ_OP_FLUSH block
requests is sufficient.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Link: https://lore.kernel.org/r/20210511101359.83521-1-ulf.hansson@linaro.org
Diffstat (limited to 'include/linux/mmc')
| -rw-r--r-- | include/linux/mmc/card.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h index 2867af0635f8..74e6c0624d27 100644 --- a/include/linux/mmc/card.h +++ b/include/linux/mmc/card.h @@ -196,6 +196,7 @@ struct sd_ext_reg { u8 page; u16 offset; u8 rev; + u8 feature_enabled; u8 feature_support; /* Power Management Function. */ #define SD_EXT_POWER_OFF_NOTIFY (1<<0) |