odroid-c2:"disableuhs" boot option enable.

Change-Id: Ife959950fe37765b4b104863350f1bf813832c70

drivers/amlogic/mmc/amlsd_of.c

@@ -59,6 +59,33 @@ static const struct sd_caps host_caps[] = {
 	SD_CAPS(MMC_PM_KEEP_POWER, "MMC_PM_KEEP_POWER"),
 };
 
+#if defined(CONFIG_ARCH_MESON64_ODROIDC2)
+int disable_uhs = 0;
+static int __init setup_disableuhs(char *s)
+{
+	disable_uhs = 0;
+	if (!strcmp(s, "true"))
+		disable_uhs = 1;
+	return 0;
+}
+__setup("disableuhs=", setup_disableuhs);
+
+/* Force to set "MMC_CAP_NONREMOVABLE" to prevent MMC card detection
+ * by MicroSD card socket.
+ */
+int mmc_removable = 0;
+static int __init setup_mmc_removable(char *s)
+{
+	mmc_removable = 0;
+	if (!strcmp(s, "true"))
+		mmc_removable = 1;
+
+	return 0;
+}
+__setup("mmc_removable=", setup_mmc_removable);
+
+#endif
+
 static int amlsd_get_host_caps(struct device_node *of_node,
 		struct amlsd_platform *pdata)
 {
@@ -75,6 +102,19 @@ static int amlsd_get_host_caps(struct device_node *of_node,
 	if (caps & MMC_CAP_8_BIT_DATA)
 		caps |= MMC_CAP_4_BIT_DATA;
 
+#if defined(CONFIG_ARCH_MESON64_ODROIDC2)
+	if (disable_uhs) {
+		caps &= ~(MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
+			MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
+			MMC_CAP_UHS_DDR50);
+	}
+
+	if (mmc_removable)
+		caps &= ~MMC_CAP_NONREMOVABLE;
+	else
+		caps |= MMC_CAP_NONREMOVABLE;
+#endif
+
 	pdata->caps = caps;
 	pr_info("pdata->caps %x\n", pdata->caps);
 	return 0;
@@ -240,8 +280,12 @@ int amlsd_get_platform_data(struct platform_device *pdev,
 		pdata->xfer_post = of_amlsd_xfer_post;
 		/* pdata->cd = of_amlsd_detect; */
 		pdata->irq_init = of_amlsd_irq_init;
-	pdata->ro = of_amlsd_ro;
+		pdata->ro = of_amlsd_ro;
+
+#if defined(CONFIG_ARCH_MESON64_ODROIDC2)
+		if (disable_uhs)
+			pdata->f_max = 40000000;
+#endif
 	}
 	return 0;
 }
-