On Fri, 23 Sept 2022 at 15:56, Avri Altman <avri.altman@xxxxxxx> wrote:
>
> Some SD-cards that are SDA-6.0 compliant reports they supports discard
> while they actually don't. This might cause mk2fs to fail while trying
> to format the card and revert it to a read-only mode.
>
> While at it, add SD MID for SANDISK. This is because eMMC MID is assign
> by JEDEC and SD MID is assigned by SD 3c-LLC.
>
> Signed-off-by: Avri Altman <avri.altman@xxxxxxx>
> ---
> drivers/mmc/core/block.c | 6 +++++-
> drivers/mmc/core/card.h | 1 +
> drivers/mmc/core/quirks.h | 6 ++++++
> include/linux/mmc/card.h | 1 +
> 4 files changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
> index ce89611a136e..a31dc915c5ec 100644
> --- a/drivers/mmc/core/block.c
> +++ b/drivers/mmc/core/block.c
> @@ -1140,8 +1140,12 @@ static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
> {
> struct mmc_blk_data *md = mq->blkdata;
> struct mmc_card *card = md->queue.card;
> + unsigned int arg = card->erase_arg;
>
> - mmc_blk_issue_erase_rq(mq, req, MMC_BLK_DISCARD, card->erase_arg);
> + if (mmc_card_sd(card) && (card->quirks & MMC_QUIRK_BROKEN_SD_DISCARD))
There's no need for the mmc_card_sd() here, as the quirk can't be set
unless it's the SD card type (see add_quirk_sd()).
Moreover, I would prefer if we can use a helper function
(mmc_card_broken_sd_discard()), that checks the new quirk bit. Similar
helpers are already available in drivers/mmc/core/card.h.
> + arg = SD_ERASE_ARG;
> +
> + mmc_blk_issue_erase_rq(mq, req, MMC_BLK_DISCARD, arg);
> }
>
> static void mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
> diff --git a/drivers/mmc/core/card.h b/drivers/mmc/core/card.h
> index 99045e138ba4..881432309b46 100644
> --- a/drivers/mmc/core/card.h
> +++ b/drivers/mmc/core/card.h
> @@ -73,6 +73,7 @@ struct mmc_fixup {
> #define EXT_CSD_REV_ANY (-1u)
>
> #define CID_MANFID_SANDISK 0x2
> +#define CID_MANFID_SANDISK_SD 0x3
> #define CID_MANFID_ATP 0x9
> #define CID_MANFID_TOSHIBA 0x11
> #define CID_MANFID_MICRON 0x13
> diff --git a/drivers/mmc/core/quirks.h b/drivers/mmc/core/quirks.h
> index be4393988086..29b9497936df 100644
> --- a/drivers/mmc/core/quirks.h
> +++ b/drivers/mmc/core/quirks.h
> @@ -100,6 +100,12 @@ static const struct mmc_fixup __maybe_unused mmc_blk_fixups[] = {
> MMC_FIXUP("V10016", CID_MANFID_KINGSTON, CID_OEMID_ANY, add_quirk_mmc,
> MMC_QUIRK_TRIM_BROKEN),
>
> + /*
> + * Some SD cards reports discard support while they don't
> + */
> + MMC_FIXUP(CID_NAME_ANY, CID_MANFID_SANDISK_SD, 0x5344, add_quirk_sd,
> + MMC_QUIRK_BROKEN_SD_DISCARD),
> +
> END_FIXUP
> };
>
> diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
> index 8a30de08e913..c726ea781255 100644
> --- a/include/linux/mmc/card.h
> +++ b/include/linux/mmc/card.h
> @@ -293,6 +293,7 @@ struct mmc_card {
> #define MMC_QUIRK_BROKEN_IRQ_POLLING (1<<11) /* Polling SDIO_CCCR_INTx could create a fake interrupt */
> #define MMC_QUIRK_TRIM_BROKEN (1<<12) /* Skip trim */
> #define MMC_QUIRK_BROKEN_HPI (1<<13) /* Disable broken HPI support */
> +#define MMC_QUIRK_BROKEN_SD_DISCARD (1<<14) /* Disable broken SD discard support */
>
> bool reenable_cmdq; /* Re-enable Command Queue */
>
> --
> 2.17.1
>
Other than the minor nitpicks above, this looks good to me!
Kind regards
Uffe
