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Date:   Wed, 12 Aug 2020 12:07:58 +0200
From:   Frank Wunderlich <>
To:     Wenbin Mei <>
Cc:     Ulf Hansson <>,
        Rob Herring <>,,
        Wenbin Mei <>,,,,,,
        Philipp Zabel <>,
        Matthias Brugger <>,
        Chaotian Jing <>,
Subject: Aw: [PATCH 3/3] mmc: mediatek: add optional module reset property

> Gesendet: Mittwoch, 12. August 2020 um 11:37 Uhr
> Von: "Wenbin Mei" <>
> Betreff: [PATCH 3/3] mmc: mediatek: add optional module reset property

> This patch adds a optional reset management for msdc.
> Sometimes the bootloader does not bring msdc register
> to default state, so need reset the msdc controller.
> Signed-off-by: Wenbin Mei <>

Thanks for posting the fix to Mainline

imho this should contain a fixes-Tag as it fixes eMMC-Access on mt7622/Bpi-R64

before we got these Errors on mounting eMMC ion R64:

[   48.664925] blk_update_request: I/O error, dev mmcblk0, sector 204800 op 0x1:(WRITE) flags 0x800 phys_seg 1 prio class 0
[   48.676019] Buffer I/O error on dev mmcblk0p1, logical block 0, lost sync page write

Fixes: 966580ad236e ("mmc: mediatek: add support for MT7622 SoC")
Tested-By: Frank Wunderlich <>

and it needs to be fixed at least for 5.4+, so adding stable-CC


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