Re: [PATCH v1 1/2] arm64: dts: rockchip: Disable HS400 for eMMC on ROCK Pi 4

[Folker Schwesinger]

On Wed Jul 5, 2023 at 4:42 PM CEST, Christopher Obbard wrote:
> There is some instablity with some eMMC modules on ROCK Pi 4 SBCs running
> in HS400 mode. This ends up resulting in some block errors after a while
> or after a "heavy" operation utilising the eMMC (e.g. resizing a
> filesystem). An example of these errors is as follows:
>
>     [  289.171014] mmc1: running CQE recovery
>     [  290.048972] mmc1: running CQE recovery
>     [  290.054834] mmc1: running CQE recovery
>     [  290.060817] mmc1: running CQE recovery
>     [  290.061337] blk_update_request: I/O error, dev mmcblk1, sector 1411072 op 0x1:(WRITE) flags 0x800 phys_seg 36 prio class 0
>     [  290.061370] EXT4-fs warning (device mmcblk1p1): ext4_end_bio:348: I/O error 10 writing to inode 29547 starting block 176466)
>     [  290.061484] Buffer I/O error on device mmcblk1p1, logical block 172288
>     [  290.061531] Buffer I/O error on device mmcblk1p1, logical block 172289
>     [  290.061551] Buffer I/O error on device mmcblk1p1, logical block 172290
>     [  290.061574] Buffer I/O error on device mmcblk1p1, logical block 172291
>     [  290.061592] Buffer I/O error on device mmcblk1p1, logical block 172292
>     [  290.061615] Buffer I/O error on device mmcblk1p1, logical block 172293
>     [  290.061632] Buffer I/O error on device mmcblk1p1, logical block 172294
>     [  290.061654] Buffer I/O error on device mmcblk1p1, logical block 172295
>     [  290.061673] Buffer I/O error on device mmcblk1p1, logical block 172296
>     [  290.061695] Buffer I/O error on device mmcblk1p1, logical block 172297
>
> Disabling the Command Queue seems to stop the CQE recovery from running,
> but doesn't seem to improve the I/O errors. Until this can be investigated
> further, disable HS400 mode on the ROCK Pi 4 SBCs to at least stop I/O
> errors from occurring.
>
> While we are here, set the eMMC maximum clock frequency to 1.5MHz to
> follow the ROCK 4C+.
>
> Fixes: 1b5715c602fd ("arm64: dts: rockchip: add ROCK Pi 4 DTS support")
> Signed-off-by: Christopher Obbard <chris.obbard@xxxxxxxxxxxxx>
> ---
>
>  arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4.dtsi | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4.dtsi
> index 907071d4fe80..95efee311ece 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4.dtsi
> @@ -645,9 +645,9 @@ &saradc {
>  };
>  
>  &sdhci {
> +	max-frequency = <150000000>;
>  	bus-width = <8>;
> -	mmc-hs400-1_8v;
> -	mmc-hs400-enhanced-strobe;
> +	mmc-hs200-1_8v;
>  	non-removable;
>  	status = "okay";
>  };

Works as advertised on a RockPi 4b v1.3 with kernel 6.1.37.

Tested-By: Folker Schwesinger <dev@xxxxxxxxxxxxxxxxxxxxx>

Folker