Re: [PATCH] mmc: Add quirk to disable DDR50 tuning

[Adrian Hunter <adrian.hunter@intel.com>]

On 24/03/25 21:21, Erick Shepherd wrote:
>> Please move this to mmc_sd_init_uhs_card() instead. Moreover, please
>> add a helper in drivers/mmc/core/card.h for
>> MMC_QUIRK_NO_UHS_DDR50_TUNING, similar to other quirks.
> 
> Sorry for the late response, how does this look? I can change the
> MMC_QUIRK_NO_UHS_DDR50_TUNING check to be before the tuning
> if-statement instead of within it if that seems more appropriate.
> 
> --- a/drivers/mmc/core/card.h
> +++ b/drivers/mmc/core/card.h
> @@ -89,6 +89,7 @@ struct mmc_fixup {
>  #define CID_MANFID_MICRON       0x13
>  #define CID_MANFID_SAMSUNG      0x15
>  #define CID_MANFID_APACER       0x27
> +#define CID_MANFID_SWISSBIT     0x5D
>  #define CID_MANFID_KINGSTON     0x70
>  #define CID_MANFID_HYNIX	0x90
>  #define CID_MANFID_KINGSTON_SD	0x9F
> @@ -294,4 +295,9 @@ static inline int mmc_card_broken_sd_poweroff_notify(const struct mmc_card *c)
>  	return c->quirks & MMC_QUIRK_BROKEN_SD_POWEROFF_NOTIFY;
>  }
>  
> +static inline int mmc_card_no_uhs_ddr50_tuning(const struct mmc_card *c)
> +{
> +	return c->quirks & MMC_QUIRK_NO_UHS_DDR50_TUNING;
> +}
> +
> 
> --- a/drivers/mmc/core/sd.c
> +++ b/drivers/mmc/core/sd.c
> @@ -664,6 +664,10 @@ static int mmc_sd_init_uhs_card(struct mmc_card *card)
> 	if (!mmc_host_is_spi(card->host) &&
>  		(card->host->ios.timing == MMC_TIMING_UHS_SDR50 ||
>  		 card->host->ios.timing == MMC_TIMING_UHS_DDR50 ||
>  		 card->host->ios.timing == MMC_TIMING_UHS_SDR104)) {
> +		if ((card->quirks & MMC_QUIRK_NO_UHS_DDR50_TUNING) &&
> +		    card->host->ios.timing == MMC_TIMING_UHS_DDR50)
> +			goto out;

Perhaps make a helper function (untested):


static bool mmc_sd_use_tuning(struct mmc_card *card)
{
	if (mmc_host_is_spi(card->host))
		return false;

	switch (card->host->ios.timing) {
	case MMC_TIMING_UHS_SDR50:
	case MMC_TIMING_UHS_SDR104:
		return true;
	case MMC_TIMING_UHS_DDR50:
		return !mmc_card_no_uhs_ddr50_tuning(card);
	}

	return false;
}

Then change to:

	if (mmc_sd_use_tuning(card)) {
		err = mmc_execute_tuning(card);
		etc
	}


> +
>  		err = mmc_execute_tuning(card);
>  
>  		/*
> 
> Regards,
> Erick