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mmc: core: Add a new quirk for limiting clock rate

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This patch adds a quirk to limit clock rate which
can be used to reduce the SDIO clock rate for some
chips with broken UHS.

Signed-off-by: Harish Jenny K N <harish_kandiga@mentor.com>
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
harish_kandiga@mentor.com
2018-04-10 12:30:31 +05:30
committed by Ulf Hansson
parent d39b1b2abf
commit ebc5a1bf4f
3 changed files with 12 additions and 1 deletions
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1
include/linux/mmc/card.h
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@@ -252,6 +252,7 @@ struct mmc_card {
#define MMC_TYPE_SD_COMBO 3 /* SD combo (IO+mem) card */
unsigned int state; /* (our) card state */
unsigned int quirks; /* card quirks */
unsigned int quirk_max_rate; /* max rate set by quirks */
#define MMC_QUIRK_LENIENT_FN0 (1<<0) /* allow SDIO FN0 writes outside of the VS CCCR range */
#define MMC_QUIRK_BLKSZ_FOR_BYTE_MODE (1<<1) /* use func->cur_blksize */
/* for byte mode */