mmc: sdhci-esdhc-imx: add HS400_ES support for i.MX8QXP

Add an new esdhc_soc_data for i.MX8QXP, and add HS400_ES mode
support.
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
[Ulf: Rebased on top of latest changes]
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

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

@@ -50,6 +50,7 @@
 #define  ESDHC_MIX_CTRL_AUTO_TUNE_EN	(1 << 24)
 #define  ESDHC_MIX_CTRL_FBCLK_SEL	(1 << 25)
 #define  ESDHC_MIX_CTRL_HS400_EN	(1 << 26)
+#define  ESDHC_MIX_CTRL_HS400_ES_EN	(1 << 27)
 /* Bits 3 and 6 are not SDHCI standard definitions */
 #define  ESDHC_MIX_CTRL_SDHCI_MASK	0xb7
 /* Tuning bits */
@@ -144,6 +145,8 @@
  * exceed 150MHz, for DDR mode, SD card clock can't exceed 45MHz.
  */
 #define ESDHC_FLAG_ERR010450		BIT(10)
+/* The IP supports HS400ES mode */
+#define ESDHC_FLAG_HS400_ES		BIT(11)
 
 struct esdhc_soc_data {
 	u32 flags;
@@ -192,6 +195,12 @@ static const struct esdhc_soc_data usdhc_imx7d_data = {
 			| ESDHC_FLAG_HS400,
 };
 
+static struct esdhc_soc_data usdhc_imx8qxp_data = {
+	.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
+			| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
+			| ESDHC_FLAG_HS400 | ESDHC_FLAG_HS400_ES,
+};
+
 struct pltfm_imx_data {
 	u32 scratchpad;
 	struct pinctrl *pinctrl;
@@ -238,6 +247,7 @@ static const struct of_device_id imx_esdhc_dt_ids[] = {
 	{ .compatible = "fsl,imx6q-usdhc", .data = &usdhc_imx6q_data, },
 	{ .compatible = "fsl,imx6ull-usdhc", .data = &usdhc_imx6ull_data, },
 	{ .compatible = "fsl,imx7d-usdhc", .data = &usdhc_imx7d_data, },
+	{ .compatible = "fsl,imx8qxp-usdhc", .data = &usdhc_imx8qxp_data, },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, imx_esdhc_dt_ids);
@@ -896,6 +906,19 @@ static int esdhc_executing_tuning(struct sdhci_host *host, u32 opcode)
 	return ret;
 }
 
+static void esdhc_hs400_enhanced_strobe(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+	u32 m;
+
+	m = readl(host->ioaddr + ESDHC_MIX_CTRL);
+	if (ios->enhanced_strobe)
+		m |= ESDHC_MIX_CTRL_HS400_ES_EN;
+	else
+		m &= ~ESDHC_MIX_CTRL_HS400_ES_EN;
+	writel(m, host->ioaddr + ESDHC_MIX_CTRL);
+}
+
 static int esdhc_change_pinstate(struct sdhci_host *host,
 						unsigned int uhs)
 {
@@ -1377,6 +1400,12 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
 	if (imx_data->socdata->flags & ESDHC_FLAG_HS400)
 		host->quirks2 |= SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400;
 
+	if (imx_data->socdata->flags & ESDHC_FLAG_HS400_ES) {
+		host->mmc->caps2 |= MMC_CAP2_HS400_ES;
+		host->mmc_host_ops.hs400_enhanced_strobe =
+					esdhc_hs400_enhanced_strobe;
+	}
+
 	if (of_id)
 		err = sdhci_esdhc_imx_probe_dt(pdev, host, imx_data);
 	else