* [PATCH v1] drm/i915/display: Allow port sync on PTL
@ 2026-10-12 4:04 Mitul Golani
2026-10-12 5:00 ` Kandpal, Suraj
2026-10-30 8:04 ` Thorsten Leemhuis
0 siblings, 2 replies; 4+ messages in thread
From: Mitul Golani @ 2026-10-12 4:04 UTC (permalink / raw)
To: intel-gfx; +Cc: intel-xe, stable
Some dual-SST tiled displays exhibit visual corruption on PTL, with
one tile's image vertically shifted or wrapped by a random amount
that changes on every hotplug.
PTL supports port sync, so allow it to be used to avoid these
display issues.
Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/work_items/8991
Fixes: 05cffc074938 ("drm/i915/display: Implement Wa_16024710867")
Cc: stable@vger.kernel.org
Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
---
drivers/gpu/drm/i915/display/intel_ddi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index a46ab5d3d70f..a0aff087fafa 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -4629,7 +4629,7 @@ intel_ddi_port_sync_transcoders(const struct intel_crtc_state *ref_crtc_state,
* From, xe3lpd onwards we have defeatured this with reference to
* Wa_16024710867
*/
- if (!IS_DISPLAY_VER(display, 9, 20))
+ if (!IS_DISPLAY_VER(display, 9, 30))
return 0;
if (!intel_crtc_has_type(ref_crtc_state, INTEL_OUTPUT_DP))
--
2.48.1
^ permalink raw reply related [flat|nested] 4+ messages in thread* RE: [PATCH v1] drm/i915/display: Allow port sync on PTL
2026-10-12 4:04 [PATCH v1] drm/i915/display: Allow port sync on PTL Mitul Golani
@ 2026-10-12 5:00 ` Kandpal, Suraj
2026-10-30 8:04 ` Thorsten Leemhuis
1 sibling, 0 replies; 4+ messages in thread
From: Kandpal, Suraj @ 2026-10-12 5:00 UTC (permalink / raw)
To: Golani, Mitulkumar Ajitkumar, intel-gfx@lists.freedesktop.org
Cc: intel-xe@lists.freedesktop.org, stable@vger.kernel.org
> Subject: [PATCH v1] drm/i915/display: Allow port sync on PTL
>
> Some dual-SST tiled displays exhibit visual corruption on PTL, with one tile's
> image vertically shifted or wrapped by a random amount that changes on
> every hotplug.
>
> PTL supports port sync, so allow it to be used to avoid these display issues.
>
> Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/work_items/8991
> Fixes: 05cffc074938 ("drm/i915/display: Implement Wa_16024710867")
> Cc: stable@vger.kernel.org
> Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_ddi.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c
> b/drivers/gpu/drm/i915/display/intel_ddi.c
> index a46ab5d3d70f..a0aff087fafa 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -4629,7 +4629,7 @@ intel_ddi_port_sync_transcoders(const struct
> intel_crtc_state *ref_crtc_state,
> * From, xe3lpd onwards we have defeatured this with reference to
> * Wa_16024710867
> */
> - if (!IS_DISPLAY_VER(display, 9, 20))
> + if (!IS_DISPLAY_VER(display, 9, 30))
I am guessing you may need to update the above comment too.
Other than that
LGTM,
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
> return 0;
>
> if (!intel_crtc_has_type(ref_crtc_state, INTEL_OUTPUT_DP))
> --
> 2.48.1
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH v1] drm/i915/display: Allow port sync on PTL
2026-10-12 4:04 [PATCH v1] drm/i915/display: Allow port sync on PTL Mitul Golani
2026-10-12 5:00 ` Kandpal, Suraj
@ 2026-10-30 8:04 ` Thorsten Leemhuis
2026-10-30 10:40 ` Jani Nikula
1 sibling, 1 reply; 4+ messages in thread
From: Thorsten Leemhuis @ 2026-10-30 8:04 UTC (permalink / raw)
To: Mitul Golani, intel-gfx; +Cc: intel-xe, stable, Linux kernel regressions list
On 10/12/26 06:04, Mitul Golani wrote:
> Some dual-SST tiled displays exhibit visual corruption on PTL, with
> one tile's image vertically shifted or wrapped by a random amount
> that changes on every hotplug.
>
> PTL supports port sync, so allow it to be used to avoid these
> display issues.
Is this fix for a recent regression still in the "to review" list of
anyone, or did it fell through the cracks? Or was this solved meanwhile
and I just missed it?
Ciao, Thorsten
> Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/work_items/8991
> Fixes: 05cffc074938 ("drm/i915/display: Implement Wa_16024710867")
> Cc: stable@vger.kernel.org
> Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_ddi.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
> index a46ab5d3d70f..a0aff087fafa 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -4629,7 +4629,7 @@ intel_ddi_port_sync_transcoders(const struct intel_crtc_state *ref_crtc_state,
> * From, xe3lpd onwards we have defeatured this with reference to
> * Wa_16024710867
> */
> - if (!IS_DISPLAY_VER(display, 9, 20))
> + if (!IS_DISPLAY_VER(display, 9, 30))
> return 0;
>
> if (!intel_crtc_has_type(ref_crtc_state, INTEL_OUTPUT_DP))
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH v1] drm/i915/display: Allow port sync on PTL
2026-10-30 8:04 ` Thorsten Leemhuis
@ 2026-10-30 10:40 ` Jani Nikula
0 siblings, 0 replies; 4+ messages in thread
From: Jani Nikula @ 2026-10-30 10:40 UTC (permalink / raw)
To: Thorsten Leemhuis, Mitul Golani, intel-gfx
Cc: intel-xe, stable, Linux kernel regressions list
On Fri, 30 Oct 2026, Thorsten Leemhuis <regressions@leemhuis.info> wrote:
> On 10/12/26 06:04, Mitul Golani wrote:
>> Some dual-SST tiled displays exhibit visual corruption on PTL, with
>> one tile's image vertically shifted or wrapped by a random amount
>> that changes on every hotplug.
>>
>> PTL supports port sync, so allow it to be used to avoid these
>> display issues.
>
> Is this fix for a recent regression still in the "to review" list of
> anyone, or did it fell through the cracks? Or was this solved meanwhile
> and I just missed it?
Pushed now, thanks for the reminder.
BR,
Jani.
>
> Ciao, Thorsten
>
>> Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/work_items/8991
>> Fixes: 05cffc074938 ("drm/i915/display: Implement Wa_16024710867")
>> Cc: stable@vger.kernel.org
>> Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
>> ---
>> drivers/gpu/drm/i915/display/intel_ddi.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
>> index a46ab5d3d70f..a0aff087fafa 100644
>> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
>> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
>> @@ -4629,7 +4629,7 @@ intel_ddi_port_sync_transcoders(const struct intel_crtc_state *ref_crtc_state,
>> * From, xe3lpd onwards we have defeatured this with reference to
>> * Wa_16024710867
>> */
>> - if (!IS_DISPLAY_VER(display, 9, 20))
>> + if (!IS_DISPLAY_VER(display, 9, 30))
>> return 0;
>>
>> if (!intel_crtc_has_type(ref_crtc_state, INTEL_OUTPUT_DP))
>
--
Jani Nikula, Intel
^ permalink raw reply [flat|nested] 4+ messages in thread
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2026-10-12 4:04 [PATCH v1] drm/i915/display: Allow port sync on PTL Mitul Golani
2026-10-12 5:00 ` Kandpal, Suraj
2026-10-30 8:04 ` Thorsten Leemhuis
2026-10-30 10:40 ` Jani Nikula
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