On Saturday 16 April 2011, Andrei Warkentin wrote:
> @@ -982,6 +1016,26 @@ static const struct mmc_fixup blk_fixups[] =
> MMC_FIXUP("SEM08G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38),
> MMC_FIXUP("SEM16G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38),
> MMC_FIXUP("SEM32G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38),
> +
> + /*
> + * Some MMC cards experience performance degradation with CMD23
> + * instead of CMD12-bounded multiblock transfers. For now we'll
> + * white list what's good:
> + * 1) Certain SanDisk eMMCs with the old MMCA manfid.
> + * 2) All new SanDisk products.
> + *
> + * N.B. This doesn't affect SD cards.
> + */
> + MMC_FIXUP(CID_NAME_ANY, CID_MANFID_ANY, CID_OEMID_ANY, add_quirk_mmc,
> + MMC_QUIRK_BLK_NO_CMD23),
> + MMC_FIXUP("SEM04G", 0x2, 0x100, remove_quirk_mmc,
> MMC_QUIRK_BLK_NO_CMD23),
> + MMC_FIXUP("SEM08G", 0x2, 0x100, remove_quirk_mmc,
> MMC_QUIRK_BLK_NO_CMD23),
> + MMC_FIXUP("SEM16G", 0x2, 0x100, remove_quirk_mmc,
> MMC_QUIRK_BLK_NO_CMD23),
> + MMC_FIXUP("SEM32G", 0x2, 0x100, remove_quirk_mmc,
> MMC_QUIRK_BLK_NO_CMD23),
> + MMC_FIXUP("SEM02G", 0x2, 0x100, remove_quirk_mmc,
> MMC_QUIRK_BLK_NO_CMD23),
> + MMC_FIXUP(CID_NAME_ANY, 0x45, CID_OEMID_ANY,
> + remove_quirk_mmc, MMC_QUIRK_BLK_NO_CMD23),
> +
> END_FIXUP
> };
Shouldn't this better be a blacklist for known bad cards?
As far as I can tell, we should always use CMD23 where possible.
Arnd
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