From e5624054c1726a16c13a89c08b2792aba3df06eb Mon Sep 17 00:00:00 2001 From: Bing Zhao Date: Tue, 26 Nov 2013 15:39:20 -0800 Subject: mmc: sdio: add a quirk for broken SDIO_CCCR_INTx polling Polling SDIO_CCCR_INTx could create a fake interrupt with Marvell SD8797 card. Add a quirk to handle this case. The fixup here is to issue a dummy CMD52 read to function 0 register 0xff, and this dummy read must be right after SDIO_CCCR_INTx is read. Patch has been verified on a dw_mmc controller (Samsung Chromebook) with MMC_CAP_SDIO_IRQ disabled. Signed-off-by: Bing Zhao Reviewed-by: Paul Stewart Reviewed-by: Doug Anderson Acked-by: Ulf Hansson Signed-off-by: Chris Ball --- include/linux/mmc/card.h | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) (limited to 'include/linux/mmc') diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h index 176fdf824b14..b73027298b3a 100644 --- a/include/linux/mmc/card.h +++ b/include/linux/mmc/card.h @@ -271,9 +271,10 @@ struct mmc_card { #define MMC_QUIRK_INAND_CMD38 (1<<6) /* iNAND devices have broken CMD38 */ #define MMC_QUIRK_BLK_NO_CMD23 (1<<7) /* Avoid CMD23 for regular multiblock */ #define MMC_QUIRK_BROKEN_BYTE_MODE_512 (1<<8) /* Avoid sending 512 bytes in */ + /* byte mode */ #define MMC_QUIRK_LONG_READ_TIME (1<<9) /* Data read time > CSD says */ #define MMC_QUIRK_SEC_ERASE_TRIM_BROKEN (1<<10) /* Skip secure for erase/trim */ - /* byte mode */ +#define MMC_QUIRK_BROKEN_IRQ_POLLING (1<<11) /* Polling SDIO_CCCR_INTx could create a fake interrupt */ unsigned int erase_size; /* erase size in sectors */ unsigned int erase_shift; /* if erase unit is power 2 */ @@ -505,6 +506,11 @@ static inline int mmc_card_long_read_time(const struct mmc_card *c) return c->quirks & MMC_QUIRK_LONG_READ_TIME; } +static inline int mmc_card_broken_irq_polling(const struct mmc_card *c) +{ + return c->quirks & MMC_QUIRK_BROKEN_IRQ_POLLING; +} + #define mmc_card_name(c) ((c)->cid.prod_name) #define mmc_card_id(c) (dev_name(&(c)->dev)) -- cgit v1.2.3