[U-Boot] [PATCH 1/3 V3] esdhc: Workaround for card can't be detected on T4240QDS

[Haijun Zhang]

Card detection pin is ineffective on T4240QDS Rev1.0.
There are two cards can be connected to board.
1. eMMC card is built-in board, can not be removed. so
   For eMMC card it is always there.
2. Card detecting pin is functional for SDHC card in Rev2.0.

This workaround force sdhc driver scan and initialize the card
regardless of whether the card is inserted or not in case Rev1.0.

Signed-off-by: Haijun Zhang <Haijun.Zhang at freescale.com>
---
changes for V3:
	- Define quirk in board specific file instead of code in driver
changes for V2:
	- Add the judgement condition for this broken card

 drivers/mmc/fsl_esdhc.c    | 4 ++++
 include/configs/T4240QDS.h | 5 +++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
index e522a70..2ee93cd 100644
--- a/drivers/mmc/fsl_esdhc.c
+++ b/drivers/mmc/fsl_esdhc.c
@@ -548,6 +548,10 @@ static int esdhc_getcd(struct mmc *mmc)
 	struct fsl_esdhc *regs = (struct fsl_esdhc *)cfg->esdhc_base;
 	int timeout = 1000;
 
+#ifdef CONFIG_ESDHC_DETECT_QUIRK
+	if (CONFIG_ESDHC_DETECT_QUIRK)
+		return 1;
+#endif
 	while (!(esdhc_read32(&regs->prsstat) & PRSSTAT_CINS) && --timeout)
 		udelay(1000);
 
diff --git a/include/configs/T4240QDS.h b/include/configs/T4240QDS.h
index c96df54..0e0b346 100644
--- a/include/configs/T4240QDS.h
+++ b/include/configs/T4240QDS.h
@@ -165,6 +165,8 @@ unsigned long get_board_ddr_clk(void);
 #define QIXIS_RCFG_CTL_RECONFIG_IDLE	0x20
 #define QIXIS_RCFG_CTL_RECONFIG_START	0x21
 #define QIXIS_RCFG_CTL_WATCHDOG_ENBLE	0x08
+#define QIXIS_BRDCFG5			0x55
+#define QIXIS_MUX_SDHC			2
 #define QIXIS_BASE_PHYS		(0xf00000000ull | QIXIS_BASE)
 
 #define CONFIG_SYS_CSPR3_EXT	(0xf)
@@ -466,6 +468,9 @@ unsigned long get_board_ddr_clk(void);
 #define CONFIG_CMD_FAT
 #define CONFIG_DOS_PARTITION
 #define CONFIG_SYS_FSL_MMC_HAS_CAPBLT_VS33
+#define CONFIG_ESDHC_DETECT_QUIRK \
+	(!(readb(QIXIS_BASE + QIXIS_BRDCFG5) & QIXIS_MUX_SDHC) || \
+	IS_SVR_REV(get_svr(), 1, 0))
 #endif
 
 #define CONFIG_BOOTDELAY	10	/* -1 disables auto-boot */
-- 
1.8.4.1