Re: [PATCH] mmc: sdhci: improve card removal check in sdhci_card_event()

[Chris Ball <cjb@laptop.org>]

Hi Shawn,

On Sun, Jun 09 2013, Shawn Guo wrote:
> The following error randomly appears on an imx6q board where gpio is
> used to implement card-detection when mounting EXT4 rootfs during boot.
>
> mmc1: Card removed during transfer!
> mmc1: Resetting controller.
> mmcblk0: unknown error -123 sending read/write command, card status 0x900
> end_request: I/O error, dev mmcblk0, sector 106744
> EXT4-fs error (device mmcblk0p2): ext4_find_entry:1312: inode #5011: comm swapper/0: reading directory lblock 0
>
> It turns out that the error message comes from the card removal check
> in function sdhci_card_event().  While we have a well implemented
> function sdhci_do_get_cd() handling all the possible cases of
> CD, the current code only checks controller internal CD case.  That
> causes problem for other CD cases like gpio on above imx6q board.
>
> Improve the check by using sdhci_do_get_cd() to cover all possible CD
> cases, so that above error on the imx6q board gets fixed.
>
> Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
> ---
>  drivers/mmc/host/sdhci.c |    3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index c81c2a2..eadb3ad 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -2066,8 +2066,7 @@ static void sdhci_card_event(struct mmc_host *mmc)
>  	spin_lock_irqsave(&host->lock, flags);
>  
>  	/* Check host->mrq first in case we are runtime suspended */
> -	if (host->mrq &&
> -	    !(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
> +	if (host->mrq && !sdhci_do_get_cd(host)) {
>  		pr_err("%s: Card removed during transfer!\n",
>  			mmc_hostname(host->mmc));
>  		pr_err("%s: Resetting controller.\n",

Thanks, pushed to mmc-next for 3.11, sorry for the delay.

- Chris.
-- 
Chris Ball   <cjb@laptop.org>   <http://printf.net/>
One Laptop Per Child