linux-kernel - Re: [PATCH v2] mmc: sdhci: add quirk for ACMD23 broken

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Message-ID: <5491CD37.7090604@broadcom.com>
Date:	Wed, 17 Dec 2014 10:36:39 -0800
From:	Scott Branden <sbranden@...adcom.com>
To:	Ulf Hansson <ulf.hansson@...aro.org>, Chris Ball <chris@...ntf.net>
CC:	<linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Ray Jui <rjui@...adcom.com>,
	<bcm-kernel-feedback-list@...adcom.com>
Subject: Re: [PATCH v2] mmc: sdhci: add quirk for ACMD23 broken

Hi Chris,

I have not received any feedback on this patch for the SDHCI controller. 
  Anything I can do to help get this accepted into the codebase?

Thanks,
  Scott

On 14-12-04 04:16 PM, Scott Branden wrote:
> Add quirk to handle broken auto-CMD23.
> Some controllers do not respond after the first auto-CMD23 is issued.
>
> This allows CMD23 to still work (mandatory for the faster UHS-I mode)
> rather than disabling CMD23 entirely via SDHCI_QUIRK2_HOST_NO_CMD23.
>
> Signed-off by: Corneliu Doban <cdoban@...adcom.com>
> Signed-off-by: Scott Branden <sbranden@...adcom.com>
> ---
>   drivers/mmc/host/sdhci.c  | 3 ++-
>   include/linux/mmc/sdhci.h | 2 ++
>   2 files changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index ada1a3e..b37331f 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -2985,7 +2985,8 @@ int sdhci_add_host(struct sdhci_host *host)
>   	/* Auto-CMD23 stuff only works in ADMA or PIO. */
>   	if ((host->version >= SDHCI_SPEC_300) &&
>   	    ((host->flags & SDHCI_USE_ADMA) ||
> -	     !(host->flags & SDHCI_USE_SDMA))) {
> +	     !(host->flags & SDHCI_USE_SDMA)) &&
> +	     !(host->quirks2 & SDHCI_QUIRK2_ACMD23_BROKEN)) {
>   		host->flags |= SDHCI_AUTO_CMD23;
>   		DBG("%s: Auto-CMD23 available\n", mmc_hostname(mmc));
>   	} else {
> diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h
> index dba793e..d979cf9 100644
> --- a/include/linux/mmc/sdhci.h
> +++ b/include/linux/mmc/sdhci.h
> @@ -100,6 +100,8 @@ struct sdhci_host {
>   #define SDHCI_QUIRK2_BROKEN_DDR50			(1<<7)
>   /* Stop command (CMD12) can set Transfer Complete when not using MMC_RSP_BUSY */
>   #define SDHCI_QUIRK2_STOP_WITH_TC			(1<<8)
> +/* Controller broken with using ACMD23 */
> +#define SDHCI_QUIRK2_ACMD23_BROKEN			(1<<9)
>
>   	int irq;		/* Device IRQ */
>   	void __iomem *ioaddr;	/* Mapped address */
>


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