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

[Jaehoon Chung]

On 11/02/2017 11:10 PM, Jorge Ramirez-Ortiz wrote:
> 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>

Applied to u-boot-mmc. Sorry for late.

Best Regards,
Jaehoon Chung

> ---
>  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;
>