[U-Boot] [PATCH] mmc: sdhci: don't clear SDHCI_INT_STATUS register during CMD_INHIBIT

[Jorge Ramirez-Ortiz]

Fixes emmc initialization regression on the db410c platform.

Clearing this register while SDHCI_PRESENT_STATE reports
SDHCI_CMD_INHIBIT leads to undefined behaviour on the db410c.

When commit 7dde50 was merged (mmc: sdhci: Wait for SDHCI_INT_DATA_END
when transferring), SDHCI transfers transitioned to wait for bit
SDHCI_INT_DATA_END before flagging transfers done.

Without this patch, the db410 platform fails to initialize its eMMC
due to all of its transfers timing out (SDHCI_INT_DATA_END is never
raised after all the blocks have been transferred).

Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz at linaro.org>
---
 drivers/mmc/sdhci.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c
index 11d1f0c..f0c5aad 100644
--- a/drivers/mmc/sdhci.c
+++ b/drivers/mmc/sdhci.c
@@ -157,7 +157,6 @@ static int sdhci_send_command(struct mmc *mmc, struct mmc_cmd *cmd,
 	/* Timeout unit - ms */
 	static unsigned int cmd_timeout = SDHCI_CMD_DEFAULT_TIMEOUT;
 
-	sdhci_writel(host, SDHCI_INT_ALL_MASK, SDHCI_INT_STATUS);
 	mask = SDHCI_CMD_INHIBIT | SDHCI_DATA_INHIBIT;
 
 	/* We shouldn't wait for data inihibit for stop commands, even
@@ -181,6 +180,8 @@ static int sdhci_send_command(struct mmc *mmc, struct mmc_cmd *cmd,
 		udelay(1000);
 	}
 
+	sdhci_writel(host, SDHCI_INT_ALL_MASK, SDHCI_INT_STATUS);
+
 	mask = SDHCI_INT_RESPONSE;
 	if (!(cmd->resp_type & MMC_RSP_PRESENT))
 		flags = SDHCI_CMD_RESP_NONE;
-- 
2.7.4