arm/imx: fix imx6q mmc error when mounting rootfs

The following error is seen in some case when mounting rootfs from
SD/MMC cards.

  Waiting for root device /dev/mmcblk0p1...
  mmc1: host does not support reading read-only switch. assuming write-enable.
  mmc1: new high speed SDHC card at address b368
  mmcblk0: mmc1:b368 SDC   3.74 GiB
   mmcblk0: p1
  mmc1: Timeout waiting for hardware interrupt.
  mmcblk0: error -110 transferring data, sector 3678224, nr 40, cmd response 0x900, card status 0xc00
  end_request: I/O error, dev mmcblk0, sector 3678225
  Buffer I/O error on device mmcblk0p1, logical block 458754
  lost page write due to I/O error on mmcblk0p1

This patch fixes the problem by lowering the usdhc clock and correcting
watermark configuration.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Cc: Chris Ball <cjb@laptop.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index ae57769ba50d..4b976f00ea85 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -32,6 +32,7 @@
 /* VENDOR SPEC register */
 #define SDHCI_VENDOR_SPEC               0xC0
 #define  SDHCI_VENDOR_SPEC_SDIO_QUIRK   0x00000002
+#define SDHCI_WTMK_LVL                  0x44
 #define SDHCI_MIX_CTRL                  0x48
 
 /*
@@ -476,6 +477,13 @@ static int __devinit sdhci_esdhc_imx_probe(struct platform_device *pdev)
         if (is_imx53_esdhc(imx_data))
                 imx_data->flags |= ESDHC_FLAG_MULTIBLK_NO_INT;
 
+        /*
+         * The imx6q ROM code will change the default watermark level setting
+         * to something insane.  Change it back here.
+         */
+        if (is_imx6q_usdhc(imx_data))
+                writel(0x08100810, host->ioaddr + SDHCI_WTMK_LVL);
+
         boarddata = &imx_data->boarddata;
         if (sdhci_esdhc_imx_probe_dt(pdev, boarddata) < 0) {
                 if (!host->mmc->parent->platform_data) {