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authorBing Zhao <bzhao@marvell.com>2013-11-26 15:39:20 -0800
committerChris Ball <chris@printf.net>2014-01-17 22:55:01 -0500
commite5624054c1726a16c13a89c08b2792aba3df06eb (patch)
tree2f54f5abf6337ed1571e6dd872a2e32164382f70 /include/linux/mmc
parent2b35bd83467df6f8284b9148d6f768148c3a5e5f (diff)
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 <bzhao@marvell.com> Reviewed-by: Paul Stewart <pstew@chromium.org> Reviewed-by: Doug Anderson <dianders@chromium.org> Acked-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Chris Ball <chris@printf.net>
Diffstat (limited to 'include/linux/mmc')
-rw-r--r--include/linux/mmc/card.h8
1 files changed, 7 insertions, 1 deletions
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 176fdf824b1..b73027298b3 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))