mmc: add MMC_QUIRK_BROKEN_CLK_GATING

Some sdio card are not following sdio standard, and do not work
when the sdio bus's clock is gated.

To keep functionnality for all legacy driver, we turn this quirk on
for every sdio card.
Drivers needs to disable the quirk manually when someone verifies that
their supported card works with clock gating.

Signed-off-by: Pierre Tardy <tardyp@gmail.com>
Acked-by: Ohad Ben-Cohen <ohad@wizery.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index ad7413854f79..adb4888248be 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -124,6 +124,7 @@ struct mmc_card {
                                                 /* for byte mode */
 #define MMC_QUIRK_NONSTD_SDIO   (1<<2)          /* non-standard SDIO card attached */
                                                 /* (missing CIA registers) */
+#define MMC_QUIRK_BROKEN_CLK_GATING (1<<3)      /* clock gating the sdio bus will make card fail */
 
         unsigned int            erase_size;     /* erase size in sectors */
         unsigned int            erase_shift;    /* if erase unit is power 2 */