FW: [PATCH] dts64: mt7622: fix slow sd card access

[SkyLake Huang]

On Sun, 2021-01-10 at 03:10 +0800, Frank Wunderlich wrote:
> From: Linux-mediatek [mailto:linux-mediatek-bounces at lists.infradead.org] On Behalf Of Frank Wunderlich
> Sent: Sunday, January 10, 2021 3:10 AM
> To: linux-mediatek at lists.infradead.org
> Cc: devicetree at vger.kernel.org; Ryder Lee <Ryder.Lee at mediatek.com>; Wenbin Mei <Wenbin.Mei at mediatek.com>; Wenjie Hu <ot_wenjie.hu at mediatek.com>; Frank Wunderlich <frank-w at public-files.de>; Sean Wang <Sean.Wang at mediatek.com>; linux-kernel at vger.kernel.org; Rob Herring <robh+dt at kernel.org>; linux-arm-kernel at lists.infradead.org; Matthias Brugger <matthias.bgg at gmail.com>; Jimin Wang (汪济民) <Jimin.Wang at mediatek.com>
> Subject: [PATCH] dts64: mt7622: fix slow sd card access
> 
> From: Frank Wunderlich <frank-w at public-files.de>
> 
> - change sdcard (mmc1) to uhs by change vqmmc-supply to 1V8 because driver
>   maps pinctrl depending on this
> - add reset-control for mmc1 like it's done for mmc0/emmc
> 
> Fixes: 2c002a3049f7 ("arm64: dts: mt7622: add mmc related device nodes")
> Fixes: 0b6286dd96c0 ("arm64: dts: mt7622: add bananapi BPI-R64 board")
> Signed-off-by: Frank Wunderlich <frank-w at public-files.de>
> ---
>  arch/arm64/boot/dts/mediatek/mt7622-bananapi-bpi-r64.dts | 3 ++-
>  arch/arm64/boot/dts/mediatek/mt7622.dtsi                 | 2 ++
>  2 files changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/mediatek/mt7622-bananapi-bpi-r64.dts b/arch/arm64/boot/dts/mediatek/mt7622-bananapi-bpi-r64.dts
> index 2f77dc40b9b8..916ca89ab8eb 100644
> --- a/arch/arm64/boot/dts/mediatek/mt7622-bananapi-bpi-r64.dts
> +++ b/arch/arm64/boot/dts/mediatek/mt7622-bananapi-bpi-r64.dts
> @@ -232,10 +232,11 @@ &mmc1 {
>  bus-width = <4>;
>  max-frequency = <50000000>;
>  cap-sd-highspeed;
> +mmc-hs200-1_8v;
>  r_smpl = <1>;
>  cd-gpios = <&pio 81 GPIO_ACTIVE_LOW>;
>  vmmc-supply = <&reg_3p3v>;
> -vqmmc-supply = <&reg_3p3v>;
> +vqmmc-supply = <&reg_1p8v>;
>  assigned-clocks = <&topckgen CLK_TOP_MSDC30_1_SEL>;
>  assigned-clock-parents = <&topckgen CLK_TOP_UNIV48M>;  }; diff --git a/arch/arm64/boot/dts/mediatek/mt7622.dtsi b/arch/arm64/boot/dts/mediatek/mt7622.dtsi
> index 5b9ec032ce8d..7c6d871538a6 100644

mt7622's SD/MMC host controller doesn't support UHS-1 mode for SD card.
To meet compatibility of mtk-sd.c driver, which is also used on other
platforms besides mt7622, we add pinctrl-1 set in mt7622 & banana pi's
dts. But actually we don't use UHS-1 pin settings on mt7622. So there's
no need to set vqmmc-supply to 1.8V