linux-kernel - RE: [PATCH] Revert "mmc: core: Capture correct oemid-bits for eMMC cards"

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Date:   Fri, 3 Nov 2023 06:40:41 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Dominique Martinet <asmadeus@...ewreck.org>,
        Ulf Hansson <ulf.hansson@...aro.org>
CC:     "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Dominique Martinet <dominique.martinet@...ark-techno.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Alex Fetters <Alex.Fetters@...min.com>
Subject: RE: [PATCH] Revert "mmc: core: Capture correct oemid-bits for eMMC
 cards"

> From: Dominique Martinet <dominique.martinet@...ark-techno.com>
> 
> This reverts commit 84ee19bffc9306128cd0f1c650e89767079efeff.
> 
> The commit above made quirks with an OEMID fail to be applied, as they
> were checking card->cid.oemid for the full 16 bits defined in MMC_FIXUP
> macros but the field would only contain the bottom 8 bits.
> 
> eMMC v5.1A might have bogus values in OEMID's higher bits so another fix
> will be made, but it has been decided to revert this until that is ready.
> 
> Fixes: 84ee19bffc93 ("mmc: core: Capture correct oemid-bits for eMMC
> cards")
> Link: https://lkml.kernel.org/r/ZToJsSLHr8RnuTHz@codewreck.org
> Link:
> https://lkml.kernel.org/r/CAPDyKFqkKibcXnwjnhc3+W1iJBHLeqQ9BpcZrSwh
> W2u9K2oUtg@...l.gmail.com
> Signed-off-by: Dominique Martinet <dominique.martinet@...ark-
> techno.com>
> Cc: stable@...r.kernel.org
> Cc: Avri Altman <avri.altman@....com>
> Cc: Ulf Hansson <ulf.hansson@...aro.org>
> Cc: Alex Fetters <Alex.Fetters@...min.com>
Reviewed-by: Avri Altman <avri.altman@....com>

> ---
> Here's the revert as discussed in "mmc: truncate quirks' oemid to 8 bits"'
> patch thread.
> Feel free to ignore if you already have something, I just checked your -next
> branch quickly and might have missed it.
> 
>  drivers/mmc/core/mmc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index
> 4a4bab9aa726..89cd48fcec79 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -104,7 +104,7 @@ static int mmc_decode_cid(struct mmc_card *card)
>         case 3: /* MMC v3.1 - v3.3 */
>         case 4: /* MMC v4 */
>                 card->cid.manfid        = UNSTUFF_BITS(resp, 120, 8);
> -               card->cid.oemid         = UNSTUFF_BITS(resp, 104, 8);
> +               card->cid.oemid         = UNSTUFF_BITS(resp, 104, 16);
>                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
>                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
>                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
> --
> 2.41.0