[PATCH] arm64: dts: rockchip: lower rk3399-puma-haikou SD controller clock frequency

[Greg KH]

On Wed, Oct 19, 2022 at 04:27:27PM +0200, Quentin Schulz wrote:
> From: Quentin Schulz <quentin.schulz at theobroma-systems.com>
> 
> From: Jakob Unterwurzacher <jakob.unterwurzacher at theobroma-systems.com>

You can not have 2 authors :(

> 
> CRC errors (code -84 EILSEQ) have been observed for some SanDisk
> Ultra A1 cards when running at 50MHz.
> 
> Waveform analysis suggest that the level shifters that are used on the
> RK3399-Q7 module for voltage translation between 3.0 and 3.3V don't
> handle clock rates at or above 48MHz properly. Back off to 40MHz for
> some safety margin.
> 
> Cc: stable at vger.kernel.org
> Fixes: 60fd9f72ce8a ("arm64: dts: rockchip: add Haikou baseboard with RK3399-Q7 SoM")
> Signed-off-by: Jakob Unterwurzacher <jakob.unterwurzacher at theobroma-systems.com>
> Signed-off-by: Quentin Schulz <quentin.schulz at theobroma-systems.com>
> ---
> We've been carrying this patch downstream for years and completely forgot to
> upstream it. This is now done.

It has to be accepted before you are done :)

thanks,

greg k-h