commit 1483151e84161449c3f652a751a04e06b0723bff
author Peng Fan <van.freenix@gmail.com> Wed Jun 15 10:53:02 2016 +0800
committer York Sun <york.sun@nxp.com> Tue Jun 28 12:08:53 2016 -0700
tree e51ba2518e0dfb3e457e1f1029870bf37d78429f
parent 84ecdf6da9eb102b2de87d5912d1554f44d33237

mmc: fsl: introduce wp_enable

Introudce wp_enable. To check WPSPL, wp_enable needs to be set
to 1 in board code.

Take i.MX6UL for example, for some boards, they do not use WP singal,
so they does not configure USDHC1_WP_SELECT_INPUT, and its default
value is 0(GPIO1_IO02). However GPIO1_IO02 is muxed for i2c usage and
SION bit set. So USDHC controller can always get wp signal and WPSPL
shows write protect and blocks driver continuing. This is not what
we want to see, so add wp_enable, and if set to 0, just omit the
WPSPL checking and this does not effect normal working of usdhc
controller.

If wp-gpios is provided in dts, wp_enable is set to 1, otherwise 0.

Signed-off-by: Peng Fan <van.freenix@gmail.com>
Cc: Pantelis Antoniou <panto@antoniou-consulting.com>
Cc: York Sun <york.sun@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Tested-by: Fabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>

drivers/mmc/fsl_esdhc.c

diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
index c5f08ea..a865c7b 100644
--- a/drivers/mmc/fsl_esdhc.c
+++ b/drivers/mmc/fsl_esdhc.c
@@ -91,7 +91,9 @@
  * Following is used when Driver Model is enabled for MMC
  * @dev: pointer for the device
  * @non_removable: 0: removable; 1: non-removable
+ * @wp_enable: 1: enable checking wp; 0: no check
  * @cd_gpio: gpio for card detection
+ * @wp_gpio: gpio for write protection
  */
 struct fsl_esdhc_priv {
 	struct fsl_esdhc *esdhc_regs;
@@ -101,7 +103,9 @@
 	struct mmc *mmc;
 	struct udevice *dev;
 	int non_removable;
+	int wp_enable;
 	struct gpio_desc cd_gpio;
+	struct gpio_desc wp_gpio;
 };
 
 /* Return the XFERTYP flags for a given command and data packet */
@@ -245,9 +249,12 @@
 #endif
 		if (wml_value > WML_WR_WML_MAX)
 			wml_value = WML_WR_WML_MAX_VAL;
-		if ((esdhc_read32(&regs->prsstat) & PRSSTAT_WPSPL) == 0) {
-			printf("\nThe SD card is locked. Can not write to a locked card.\n\n");
-			return TIMEOUT;
+		if (priv->wp_enable) {
+			if ((esdhc_read32(&regs->prsstat) &
+			    PRSSTAT_WPSPL) == 0) {
+				printf("\nThe SD card is locked. Can not write to a locked card.\n\n");
+				return TIMEOUT;
+			}
 		}
 
 		esdhc_clrsetbits32(&regs->wml, WML_WR_WML_MASK,
@@ -721,6 +728,7 @@
 	priv->esdhc_regs = (struct fsl_esdhc *)(unsigned long)(cfg->esdhc_base);
 	priv->bus_width = cfg->max_bus_width;
 	priv->sdhc_clk = cfg->sdhc_clk;
+	priv->wp_enable  = cfg->wp_enable;
 
 	return 0;
 };
@@ -963,6 +971,13 @@
 					   &priv->cd_gpio, GPIOD_IS_IN);
 	}
 
+	priv->wp_enable = 1;
+
+	ret = gpio_request_by_name_nodev(fdt, node, "wp-gpios", 0,
+					 &priv->wp_gpio, GPIOD_IS_IN);
+	if (ret)
+		priv->wp_enable = 0;
+
 	/*
 	 * TODO:
 	 * Because lack of clk driver, if SDHC clk is not enabled,