Re: 回复: backport a patch for Linux kernel-5.15 kernel-6.1 kenrel-6.6 stable tree

[Greg KH <gregkh@linuxfoundation.org>]

On Thu, May 23, 2024 at 06:41:04AM +0000, Lin Gui (桂林) wrote:
> Dear @Greg KH<mailto:gregkh@linuxfoundation.org>,
> 
> 
> What is the git id of it in Linus's tree?
> [MTK]
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/mmc/core/mmc.c?h=v6.9&id=77e01b49e35f24ebd1659096d5fc5c3b75975545
> 
> 
> author    Mengqi Zhang <mengqi.zhang@mediatek.com>    2023-12-25 17:38:40 +0800
> committer      Ulf Hansson <ulf.hansson@linaro.org>     2024-01-02 17:54:05 +0100
> commit   77e01b49e35f24ebd1659096d5fc5c3b75975545 (patch)
> tree 02a13063666685bc7061b46183fc45298b2dc9f4 /drivers/mmc/core/mmc.c
> parent    09f164d393a6671e5ff8342ba6b3cb7fe3f20208 (diff)
> download      linux-77e01b49e35f24ebd1659096d5fc5c3b75975545.tar.gz
> mmc: core: Add HS400 tuning in HS400es initialization
> During the initialization to HS400es stage, add a HS400 tuning flow as an
> optional process. For Mediatek IP, the HS400es mode requires a specific
> tuning to ensure the correct HS400 timing setting.
> 
> Signed-off-by: Mengqi Zhang <mengqi.zhang@mediatek.com>
> Link: https://lore.kernel.org/r/20231225093839.22931-2-mengqi.zhang@mediatek.com
> Signed-off-by: Ulf Hansson ulf.hansson@linaro.org<mailto:ulf.hansson@linaro.org>


I don't understand, why does this qualify as a stable patch?  The
changes says this is "optional", which means the device should work just
fine without it, right?

Is this a regression fix from something that previously used to work
properly?

You have read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
right?

thanks,

greg k-h