mmc: sdhci-of-esdhc: fix host version for T4240-R1.0-R2.0

The eSDHC of T4240-R1.0-R2.0 has incorrect vender version and spec version.
Acturally the right version numbers should be VVN=0x13 and SVN = 0x1.
This patch adds the GUTS driver support for eSDHC driver to match SoC.
And fix host version to avoid that incorrect version numbers break down
the ADMA data transfer.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Scott Wood <oss@buserror.net>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/Kconfig

@@ -144,6 +144,7 @@ config MMC_SDHCI_OF_ESDHC
 	depends on MMC_SDHCI_PLTFM
 	depends on PPC || ARCH_MXC || ARCH_LAYERSCAPE
 	select MMC_SDHCI_IO_ACCESSORS
+	select FSL_GUTS
 	help
 	  This selects the Freescale eSDHC controller support.
 

drivers/mmc/host/sdhci-of-esdhc.c

@@ -18,6 +18,7 @@
 #include <linux/of.h>
 #include <linux/delay.h>
 #include <linux/module.h>
+#include <linux/sys_soc.h>
 #include <linux/mmc/host.h>
 #include "sdhci-pltfm.h"
 #include "sdhci-esdhc.h"
@@ -28,6 +29,7 @@
 struct sdhci_esdhc {
 	u8 vendor_ver;
 	u8 spec_ver;
+	bool quirk_incorrect_hostver;
 };
 
 /**
@@ -87,6 +89,8 @@ static u32 esdhc_readl_fixup(struct sdhci_host *host,
 static u16 esdhc_readw_fixup(struct sdhci_host *host,
 				     int spec_reg, u32 value)
 {
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct sdhci_esdhc *esdhc = sdhci_pltfm_priv(pltfm_host);
 	u16 ret;
 	int shift = (spec_reg & 0x2) * 8;
 
@@ -94,6 +98,12 @@ static u16 esdhc_readw_fixup(struct sdhci_host *host,
 		ret = value & 0xffff;
 	else
 		ret = (value >> shift) & 0xffff;
+	/* Workaround for T4240-R1.0-R2.0 eSDHC which has incorrect
+	 * vendor version and spec version information.
+	 */
+	if ((spec_reg == SDHCI_HOST_VERSION) &&
+	    (esdhc->quirk_incorrect_hostver))
+		ret = (VENDOR_V_23 << SDHCI_VENDOR_VER_SHIFT) | SDHCI_SPEC_200;
 	return ret;
 }
 
@@ -572,6 +582,12 @@ static const struct sdhci_pltfm_data sdhci_esdhc_le_pdata = {
 	.ops = &sdhci_esdhc_le_ops,
 };
 
+static struct soc_device_attribute soc_incorrect_hostver[] = {
+	{ .family = "QorIQ T4240", .revision = "1.0", },
+	{ .family = "QorIQ T4240", .revision = "2.0", },
+	{ },
+};
+
 static void esdhc_init(struct platform_device *pdev, struct sdhci_host *host)
 {
 	struct sdhci_pltfm_host *pltfm_host;
@@ -585,6 +601,10 @@ static void esdhc_init(struct platform_device *pdev, struct sdhci_host *host)
 	esdhc->vendor_ver = (host_ver & SDHCI_VENDOR_VER_MASK) >>
 			     SDHCI_VENDOR_VER_SHIFT;
 	esdhc->spec_ver = host_ver & SDHCI_SPEC_VER_MASK;
+	if (soc_device_match(soc_incorrect_hostver))
+		esdhc->quirk_incorrect_hostver = true;
+	else
+		esdhc->quirk_incorrect_hostver = false;
 }
 
 static int sdhci_esdhc_probe(struct platform_device *pdev)