[PATCH v2] drm/ast: report connection status on Display Port.

[Linux regression tracking (Thorsten Leemhuis)]

On 10.07.23 10:12, Jocelyn Falempe wrote:
> On 06/07/2023 15:03, Linux regression tracking (Thorsten Leemhuis) wrote:
>> On 06.07.23 11:58, Jocelyn Falempe wrote:
>>> Aspeed always report the display port as "connected", because it
>>> doesn't set a .detect callback.
>>> Fix this by providing the proper detect callback for astdp and dp501.
>>>
>>> This also fixes the following regression:
>>> Since commit fae7d186403e ("drm/probe-helper: Default to 640x480 if no
>>>   EDID on DP")
>>> The default resolution is now 640x480 when no monitor is connected.
>>> But Aspeed graphics is mostly used in servers, where no monitor
>>> is attached. This also affects the remote BMC resolution to 640x480,
>>> which is inconvenient, and breaks the anaconda installer.
>>>
>>> v2: Add .detect callback to the dp/dp501 connector (Jani Nikula)
>>>
>>> Signed-off-by: Jocelyn Falempe <jfalempe at redhat.com>
>>
>> So if this "also fixes a regression" how about a Fixes: tag and a CC:
>> <stable tag to ensure this is not only fixed in latest mainline, but
>> also in all affected stable and longterm kernels?
> 
> In this case, the regression only affect one userspace program
> (anaconda),

That is (mostly) irrelevant when it comes to regressions.

> and the fix looks too risky to backport to all stable kernels.

Not sure, but I tend to thing that decision would better be left to the
stable team. Each developer will have a different opinion about what's
too risky or not and they might be in the better position to judge what
they want for their trees. A "Fixes:" tag thus still seems appropriate
here; will also tell downstream distros that might want to pick this up.

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
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