mmc: sdhci-esdhc-imx: fix host version read

When commit 95a2482 (mmc: sdhci-esdhc-imx: add basic imx6q usdhc
support) works around host version issue on imx6q, it gets the
register address fixup "reg ^= 2" lost for imx25/35/51/53 esdhc.
Thus, the controller version on these SoCs is wrongly identified
as v1 while it's actually v2.

Add the address fixup back and take a different approach to correct
imx6q host version, so that the host version read gets back to work
for all SoCs.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 11 insertions, 8 deletions

diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index ae68bc965ab5..ac6f971b625f 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -220,15 +220,18 @@ static void esdhc_writel_le(struct sdhci_host *host, u32 val, int reg)
 
 static u16 esdhc_readw_le(struct sdhci_host *host, int reg)
 {
+        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+        struct pltfm_imx_data *imx_data = pltfm_host->priv;
+
         if (unlikely(reg == SDHCI_HOST_VERSION)) {
-                u16 val = readw(host->ioaddr + (reg ^ 2));
-                /*
-                 * uSDHC supports SDHCI v3.0, but it's encoded as value
-                 * 0x3 in host controller version register, which violates
-                 * SDHCI_SPEC_300 definition.  Work it around here.
-                 */
-                if ((val & SDHCI_SPEC_VER_MASK) == 3)
-                        return --val;
+                reg ^= 2;
+                if (is_imx6q_usdhc(imx_data)) {
+                        /*
+                         * The usdhc register returns a wrong host version.
+                         * Correct it here.
+                         */
+                        return SDHCI_SPEC_300;
+                }
         }
 
         return readw(host->ioaddr + reg);