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 */