[PATCH] MMC: IMX: Reset MMC_BOOT register after controller reset.

[PATCH] MMC: IMX: Reset MMC_BOOT register after controller reset.

[Andrey Panov]

This helps with EMMC detection when booting from EMMC directly.
Taken from u-boot.

Signed-off-by: Andrey Panov <rockford@yandex.ru>
---
 drivers/mci/imx-esdhc.c | 3 +++
 drivers/mci/sdhci.h     | 1 +
 2 files changed, 4 insertions(+)

diff --git a/drivers/mci/imx-esdhc.c b/drivers/mci/imx-esdhc.c
index 239cd37..23bdc1f 100644
--- a/drivers/mci/imx-esdhc.c
+++ b/drivers/mci/imx-esdhc.c
@@ -471,6 +471,9 @@ static int esdhc_init(struct mci_host *mci, struct device_d *dev)
 	esdhc_write32(regs + SDHCI_CLOCK_CONTROL__TIMEOUT_CONTROL__SOFTWARE_RESET,
 			SYSCTL_HCKEN | SYSCTL_IPGEN);
 
+	/* RSTA doesn't reset MMC_BOOT register, so manually reset it */
+	esdhc_write32(regs + SDHCI_MMC_BOOT, 0);
+
 	/* Set the initial clock speed */
 	set_sysctl(mci, 400000);
 
diff --git a/drivers/mci/sdhci.h b/drivers/mci/sdhci.h
index b678184..82a692e 100644
--- a/drivers/mci/sdhci.h
+++ b/drivers/mci/sdhci.h
@@ -18,6 +18,7 @@
 #define SDHCI_SIGNAL_ENABLE					0x38
 #define SDHCI_ACMD12_ERR__HOST_CONTROL2				0x3C
 #define SDHCI_CAPABILITIES					0x40
+#define SDHCI_MMC_BOOT						0xC4
 
 #define COMMAND_CMD(x)		((x & 0x3f) << 24)
 #define COMMAND_CMDTYP_NORMAL	0x0
-- 
2.1.4


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Re: [PATCH] MMC: IMX: Reset MMC_BOOT register after controller reset.

[Sascha Hauer]

On Sat, Jan 17, 2015 at 03:54:35PM +0300, Andrey Panov wrote:
> This helps with EMMC detection when booting from EMMC directly.
> Taken from u-boot.
> 
> Signed-off-by: Andrey Panov <rockford@yandex.ru>

Applied, thanks

Sascha


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