mmc: sdhci-of-esdhc: workaround for unreliable pulse width detection

This was a SoC issue on LX2160A Rev1.0.
eSDHC_DLLCFG1[DLL_PD_PULSE_STRETCH_SEL] must be set to 0 to
get 4 delay cells in the pulse width detection logic for eMMC
HS400 mode. Otherwise it would cause unexpected HS400 issue.
This patch is to clear this bit always for affected SoC when
reset for all, since this bit doesn't affect other speed modes.

Signed-off-by: Yangbo Lu <[e-mail]>
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/mmc/host/sdhci-esdhc.h

···
 #define ESDHC_DLL_ENABLE		0x80000000
 #define ESDHC_DLL_FREQ_SEL		0x08000000
 
+/* DLL Config 1 Register */
+#define ESDHC_DLLCFG1			0x164
+#define ESDHC_DLL_PD_PULSE_STRETCH_SEL	0x80000000
+
 /* DLL Status 0 Register */
 #define ESDHC_DLLSTAT0			0x170
 #define ESDHC_DLL_STS_SLV_LOCK		0x08000000

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

···
 	u8 spec_ver;
 	bool quirk_incorrect_hostver;
 	bool quirk_limited_clk_division;
+	bool quirk_unreliable_pulse_detection;
 	bool quirk_fixup_tuning;
 	unsigned int peripheral_clock;
 	const struct esdhc_clk_fixup *clk_fixup;
···
 
 static void esdhc_reset(struct sdhci_host *host, u8 mask)
 {
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct sdhci_esdhc *esdhc = sdhci_pltfm_priv(pltfm_host);
 	u32 val;
 
 	sdhci_reset(host, mask);
···
 		val = sdhci_readl(host, ESDHC_TBCTL);
 		val &= ~ESDHC_TB_EN;
 		sdhci_writel(host, val, ESDHC_TBCTL);
+
+		if (esdhc->quirk_unreliable_pulse_detection) {
+			val = sdhci_readl(host, ESDHC_DLLCFG1);
+			val &= ~ESDHC_DLL_PD_PULSE_STRETCH_SEL;
+			sdhci_writel(host, val, ESDHC_DLLCFG1);
+		}
 	}
 }
 
···
 	{ },
 };
 
+static struct soc_device_attribute soc_unreliable_pulse_detection[] = {
+	{ .family = "QorIQ LX2160A", .revision = "1.0", },
+	{ },
+};
+
 static void esdhc_init(struct platform_device *pdev, struct sdhci_host *host)
 {
 	const struct of_device_id *match;
···
 		esdhc->quirk_limited_clk_division = true;
 	else
 		esdhc->quirk_limited_clk_division = false;
+
+	if (soc_device_match(soc_unreliable_pulse_detection))
+		esdhc->quirk_unreliable_pulse_detection = true;
+	else
+		esdhc->quirk_unreliable_pulse_detection = false;
 
 	match = of_match_node(sdhci_esdhc_of_match, pdev->dev.of_node);
 	if (match)