mmc: sdhci: add quirk for broken HS200 support

This patch defines a quirk for platforms unable to enable HS200 support.

Signed-off-by: David Cohen <david.a.cohen@linux.intel.com>
Reviewed-by: Chuanxiao Dong <chuanxiao.dong@intel.com>
Acked-by: Dong Aisheng <b29396@freescale.com>
Cc: stable <stable@vger.kernel.org> # [3.13]
Signed-off-by: Chris Ball <chris@printf.net>

drivers/mmc/host/sdhci.c

@@ -3016,7 +3016,8 @@ int sdhci_add_host(struct sdhci_host *host)
  /* SD3.0: SDR104 is supported so (for eMMC) the caps2
  * field can be promoted to support HS200.
  */
- mmc->caps2 |= MMC_CAP2_HS200;
+ if (!(host->quirks2 & SDHCI_QUIRK2_BROKEN_HS200))
+ mmc->caps2 |= MMC_CAP2_HS200;
  } else if (caps[1] & SDHCI_SUPPORT_SDR50)
  mmc->caps |= MMC_CAP_UHS_SDR50;
 

include/linux/mmc/sdhci.h

@@ -98,6 +98,8 @@ struct sdhci_host {
 #define SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON (1<<4)
 /* Controller has a non-standard host control register */
 #define SDHCI_QUIRK2_BROKEN_HOST_CONTROL (1<<5)
+/* Controller does not support HS200 */
+#define SDHCI_QUIRK2_BROKEN_HS200 (1<<6)
 
  int irq; /* Device IRQ */
  void __iomem *ioaddr; /* Mapped address */