A few HDMI fixes for 6.18.y

A few HDMI fixes for 6.18.y

[Mario Limonciello]

Hi,

There was a commit in 6.18 that caused a problem:
c918e75e1ed9 ("drm/amd/display: Add an HPD filter for HDMI")

This has been fixed by these commits:
commit 6a681cd90345 ("drm/amd/display: Add an hdmi_hpd_debounce_delay_ms 
module")
commit 17b2c526fd80 ("drm/amd/display: Clear HDMI HPD pending work only 
if it is enabled")

Can we please bring to 6.18.y and 6.19.y?

Thanks,

Re: A few HDMI fixes for 6.18.y

[Greg KH]

On Mon, Feb 23, 2026 at 02:04:05PM -0600, Mario Limonciello wrote:
> Hi,
> 
> There was a commit in 6.18 that caused a problem:
> c918e75e1ed9 ("drm/amd/display: Add an HPD filter for HDMI")
> 
> This has been fixed by these commits:
> commit 6a681cd90345 ("drm/amd/display: Add an hdmi_hpd_debounce_delay_ms
> module")
> commit 17b2c526fd80 ("drm/amd/display: Clear HDMI HPD pending work only if
> it is enabled")
> 
> Can we please bring to 6.18.y and 6.19.y?

These only apply to 6.18.y, but not 6.19.y, so can you provide a working
backport for both?

thanks,

greg k-h

Re: A few HDMI fixes for 6.18.y

[Mario Limonciello]

On 2/24/2026 6:56 PM, Greg KH wrote:
> On Mon, Feb 23, 2026 at 02:04:05PM -0600, Mario Limonciello wrote:
>> Hi,
>>
>> There was a commit in 6.18 that caused a problem:
>> c918e75e1ed9 ("drm/amd/display: Add an HPD filter for HDMI")
>>
>> This has been fixed by these commits:
>> commit 6a681cd90345 ("drm/amd/display: Add an hdmi_hpd_debounce_delay_ms
>> module")
>> commit 17b2c526fd80 ("drm/amd/display: Clear HDMI HPD pending work only if
>> it is enabled")
>>
>> Can we please bring to 6.18.y and 6.19.y?
> 
> These only apply to 6.18.y, but not 6.19.y, so can you provide a working
> backport for both?
> 

It looks like 6.19.y already picked them up!

❯ git checkout linux-6.19.y
❯ git cherry-pick -x 6a681cd90345
Auto-merging drivers/gpu/drm/amd/amdgpu/amdgpu.h
Auto-merging drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
Auto-merging drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
Auto-merging drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
On branch linux-6.19.y
Your branch is up to date with 'origin/linux-6.19.y'.

You are currently cherry-picking commit 6a681cd90345.
   (all conflicts fixed: run "git cherry-pick --continue")
   (use "git cherry-pick --skip" to skip this patch)
   (use "git cherry-pick --abort" to cancel the cherry-pick operation)

nothing to commit, working tree clean
The previous cherry-pick is now empty, possibly due to conflict resolution.
If you wish to commit it anyway, use:

     git commit --allow-empty

Otherwise, please use 'git cherry-pick --skip'
❯ git cherry-pick --skip
❯ git cherry-pick -x 17b2c526fd80
Auto-merging drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
On branch linux-6.19.y
Your branch is up to date with 'origin/linux-6.19.y'.

You are currently cherry-picking commit 17b2c526fd80.
   (all conflicts fixed: run "git cherry-pick --continue")
   (use "git cherry-pick --skip" to skip this patch)
   (use "git cherry-pick --abort" to cancel the cherry-pick operation)

nothing to commit, working tree clean
The previous cherry-pick is now empty, possibly due to conflict resolution.
If you wish to commit it anyway, use:

     git commit --allow-empty

Otherwise, please use 'git cherry-pick --skip'
❯ git cherry-pick --skip

Re: A few HDMI fixes for 6.18.y

[Greg KH]

On Tue, Feb 24, 2026 at 08:31:06PM -0600, Mario Limonciello wrote:
> 
> 
> On 2/24/2026 6:56 PM, Greg KH wrote:
> > On Mon, Feb 23, 2026 at 02:04:05PM -0600, Mario Limonciello wrote:
> > > Hi,
> > > 
> > > There was a commit in 6.18 that caused a problem:
> > > c918e75e1ed9 ("drm/amd/display: Add an HPD filter for HDMI")
> > > 
> > > This has been fixed by these commits:
> > > commit 6a681cd90345 ("drm/amd/display: Add an hdmi_hpd_debounce_delay_ms
> > > module")
> > > commit 17b2c526fd80 ("drm/amd/display: Clear HDMI HPD pending work only if
> > > it is enabled")
> > > 
> > > Can we please bring to 6.18.y and 6.19.y?
> > 
> > These only apply to 6.18.y, but not 6.19.y, so can you provide a working
> > backport for both?
> > 
> 
> It looks like 6.19.y already picked them up!

I thought so, but for some reason my tools couldn't find that.  Ah, it
was one of those "cherry picked from" drm nonsense patches.  Ugh, what a
mess, I don't know why my tools didn't notice this, normally it does for
the intel patches that show up in the tree like this.

Maybe something is busted on my end with the 6.19->7.0-rc1 transition
that my tools couldn't handle.  I thought I found all the corner cases
of that, but as it only happens every few years, odds are I missed
something somewhere...

Anyway, I'll go queue these two up for just 6.18, thanks.

greg k-h