linux-kernel - Re: [PATCH 1/4] mmc: mtk-sd: disable auto CMD23 support for mt7620

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Message-ID: <b0bd3ac2-7698-40a4-966f-25a06a15c9ff@collabora.com>
Date: Mon, 23 Jun 2025 11:57:00 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Shiji Yang <yangshiji66@...look.com>, linux-mmc@...r.kernel.org,
 Chaotian Jing <chaotian.jing@...iatek.com>
Cc: Ulf Hansson <ulf.hansson@...aro.org>,
 Matthias Brugger <matthias.bgg@...il.com>, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 1/4] mmc: mtk-sd: disable auto CMD23 support for mt7620

Il 19/06/25 07:35, Shiji Yang ha scritto:
> MT7628 ProgrammingGuide indicates that the host controller version
> 3.0 and later support auto CMD23 function. However, it doesn't
> define the SD command register BIT[29](Auto CMD23 enable bit). I
> guess the legacy MIPS MT762x series SoCs don't support this feature
> at all. The experiment on JDCloud RE-SP-01B(MT7621 + 128 GiB EMMC)
> shows that disabling auto CMD23 can fix the following IO errors:
> 
> [  143.344604] mtk-msdc 1e130000.mmc: msdc_track_cmd_data: cmd=6 arg=03B30101; host->error=0x00000002
> [  143.353661] mtk-msdc 1e130000.mmc: msdc_track_cmd_data: cmd=6 arg=03B30101; host->error=0x00000002
> [  143.362662] mtk-msdc 1e130000.mmc: msdc_track_cmd_data: cmd=6 arg=03B30101; host->error=0x00000002
> [  143.371684] mtk-msdc 1e130000.mmc: msdc_track_cmd_data: cmd=6 arg=03B30101; host->error=0x00000002
> [  143.380684] I/O error, dev mmcblk0boot0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 4 prio class 0
> [  143.390414] mtk-msdc 1e130000.mmc: msdc_track_cmd_data: cmd=6 arg=03B30101; host->error=0x00000002
> [  143.399468] mtk-msdc 1e130000.mmc: msdc_track_cmd_data: cmd=6 arg=03B30101; host->error=0x00000002
> [  143.408516] mtk-msdc 1e130000.mmc: msdc_track_cmd_data: cmd=6 arg=03B30101; host->error=0x00000002
> [  143.417556] mtk-msdc 1e130000.mmc: msdc_track_cmd_data: cmd=6 arg=03B30101; host->error=0x00000002
> [  143.426590] I/O error, dev mmcblk0boot0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
> [  143.435585] Buffer I/O error on dev mmcblk0boot0, logical block 0, async page read
> 
> Signed-off-by: Shiji Yang <yangshiji66@...look.com>

Chaotian, could you please confirm that MT7628 does not support AutoCMD23?

Thanks,
Angelo