Re: [PATCH v2] arm64: dts: rockchip: fix emmc reset polarity on px30-cobra

From: Quentin Schulz

Date: Tue Jun 09 2026 - 05:27:12 EST


Hi Jakob,

On 6/9/26 10:17 AM, Jakob Unterwurzacher wrote:
From: Jakob Unterwurzacher <jakob.unterwurzacher@xxxxxxxxx>

Technically, the reset signal is active low - it's called RST_n after all.

But it is ignored completely unless RST_n_FUNCTION=1 (byte 162 in extcsd)
is set in the emmc. It is 0 per default.

For emmcs that have RST_n_FUNCTION=1 we failed like this:

[ 3.074480] mmc1: Failed to initialize a non-removable card

With this change they work normally.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: bb510ddc9d3e ("arm64: dts: rockchip: add px30-cobra base dtsi and board variants")
Signed-off-by: Jakob Unterwurzacher <jakob.unterwurzacher@xxxxxxxxx>

Please try to not forget to add tags (Reviewed-by, Acked-by, Tested-by, ...) given in earlier versions of a newer version of the patch (except if substantial changes were made, which isn't the case here).

Reviewed-by: Quentin Schulz <quentin.schulz@xxxxxxxxx>

Thanks!
Quentin