[PATCH 3.12 022/122] mmc: sdhci: add quirk for broken HS200 support

[Jiri Slaby]

From: David Cohen <david.a.cohen@xxxxxxxxxxxxxxx>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 13868bf20f2f2c305f96e23620b024e167d6f9cb upstream.

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

Signed-off-by: David Cohen <david.a.cohen@xxxxxxxxxxxxxxx>
Reviewed-by: Chuanxiao Dong <chuanxiao.dong@xxxxxxxxx>
Acked-by: Dong Aisheng <b29396@xxxxxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx> # [3.13]
Signed-off-by: Chris Ball <chris@xxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
 drivers/mmc/host/sdhci.c  | 3 ++-
 include/linux/mmc/sdhci.h | 2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index ff6e822d2b78..cf110751d1c6 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -3006,7 +3006,8 @@ 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;
 
diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h
index 3e781b8c0be7..362927c48f97 100644
--- a/include/linux/mmc/sdhci.h
+++ b/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 */
-- 
2.2.2

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