FAILED: patch "[PATCH] drm/i915/display: Disable pipe joiner on WCL" failed to apply to 6.18-stable tree

FAILED: patch "[PATCH] drm/i915/display: Disable pipe joiner on WCL" failed to apply to 6.18-stable tree

[Sasha Levin]

The patch below does not apply to the 6.18-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.18.y
git checkout FETCH_HEAD
git cherry-pick -x b42b656db1384255044754cd2163d370d766b776
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '20261109200248-failed-6.18-b42b656db138@kernel.org' --subject-prefix 'PATCH 6.18.y' 'HEAD^..'

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

From b42b656db1384255044754cd2163d370d766b776 Mon Sep 17 00:00:00 2001
From: Vidya Srinivas <vidya.srinivas@intel.com>
Date: Wed, 28 Oct 2026 12:34:04 +0530
Subject: [PATCH] drm/i915/display: Disable pipe joiner on WCL

Pipe joining is not supported in the WCL display configuration.
Report no joiner support on WCL so that modes which would require
joining are rejected, matching the 4k 60Hz maximum resolution
documented for the platform.

v2: Rebase onto latest upstream
v3: Fix up the commit message
v4: Split the scaler and joiner changes into separate patches (Jani)

Bspec: 74286
Fixes: f8e1c3e07db1 ("drm/i915/xe3lpd: Add support for display version 30.02")
Cc: stable@vger.kernel.org
Suggested-by: Charlton Lin <charlton.lin@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Vidya Srinivas <vidya.srinivas@intel.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Link: https://patch.msgid.link/20261028070404.1913843-3-vidya.srinivas@intel.com
(cherry picked from commit 917676a55a690319a01b45d3956eaf94ba564df8)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index d8c0d9381471d..47741957935ae 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -477,9 +477,9 @@ bool intel_dp_has_joiner(struct intel_dp *intel_dp)
 	    !connector->panel.vbt.edp.pipe_joiner_enable)
 		return false;
 
-	return DISPLAY_VER(display) >= 12 ||
+	return ((DISPLAY_VER(display) >= 12 && DISPLAY_VERx100(display) != 3002) ||
 		(DISPLAY_VER(display) == 11 &&
-		 encoder->port != PORT_A);
+		 encoder->port != PORT_A));
 }
 
 static int dg2_max_source_rate(struct intel_dp *intel_dp)
-- 
2.53.0

RE: FAILED: patch "[PATCH] drm/i915/display: Disable pipe joiner on WCL" failed to apply to 6.18-stable tree

[Srinivas, Vidya]

> -----Original Message-----
> From: Sasha Levin <sashal@kernel.org>
> Sent: 10 November 2026 06:33
> To: Srinivas, Vidya <vidya.srinivas@intel.com>; Lin, Charlton
> <charlton.lin@intel.com>; Shankar, Uma <uma.shankar@intel.com>;
> joonas.lahtinen@linux.intel.com
> Cc: stable@vger.kernel.org
> Subject: FAILED: patch "[PATCH] drm/i915/display: Disable pipe joiner on
> WCL" failed to apply to 6.18-stable tree
> 
> The patch below does not apply to the 6.18-stable tree.
> If someone wants it applied there, or to any other stable or longterm tree,
> then please email the backport, including the original git commit id to
> <stable@vger.kernel.org>.
> 
> To reproduce the conflict and resubmit, you may use the following
> commands:
> 
> git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-
> 6.18.y git checkout FETCH_HEAD git cherry-pick -x
> b42b656db1384255044754cd2163d370d766b776
> # <resolve conflicts, build, test, etc.> git commit -s git send-email --to
> '<stable@vger.kernel.org>' --in-reply-to '20261109200248-failed-6.18-
> b42b656db138@kernel.org' --subject-prefix 'PATCH 6.18.y' 'HEAD^..'
>

Hello Sasha

Apologies for the inconvenience.

When we apply
https://patch.msgid.link/20260108124141.1407760-2-ankit.k.nautiyal@intel.com
https://patch.msgid.link/20260108124141.1407760-3-ankit.k.nautiyal@intel.com
https://lore.kernel.org/all/20261023100052.683192-10-mika.kahola@intel.com/

Then, this series https://lore.kernel.org/all/SJ2PR11MB8346E58752F73C9F86DE6576F46E2@SJ2PR11MB8346.namprd11.prod.outlook.com/ applies properly.

Sorry to bother you. Could you please guide me how to get those patches to 6.18?
I will try to check around with Uma Shankar and others to get some help.
Once again sorry for the trouble. Thank you very much.

Regards
Vidya

 
> Thanks,
> Sasha
> 
> ------------------ original commit in Linus's tree ------------------
> 
> From b42b656db1384255044754cd2163d370d766b776 Mon Sep 17 00:00:00
> 2001
> From: Vidya Srinivas <vidya.srinivas@intel.com>
> Date: Wed, 28 Oct 2026 12:34:04 +0530
> Subject: [PATCH] drm/i915/display: Disable pipe joiner on WCL
> 
> Pipe joining is not supported in the WCL display configuration.
> Report no joiner support on WCL so that modes which would require joining
> are rejected, matching the 4k 60Hz maximum resolution documented for the
> platform.
> 
> v2: Rebase onto latest upstream
> v3: Fix up the commit message
> v4: Split the scaler and joiner changes into separate patches (Jani)
> 
> Bspec: 74286
> Fixes: f8e1c3e07db1 ("drm/i915/xe3lpd: Add support for display version
> 30.02")
> Cc: stable@vger.kernel.org
> Suggested-by: Charlton Lin <charlton.lin@intel.com>
> Reviewed-by: Uma Shankar <uma.shankar@intel.com>
> Signed-off-by: Vidya Srinivas <vidya.srinivas@intel.com>
> Signed-off-by: Uma Shankar <uma.shankar@intel.com>
> Link: https://patch.msgid.link/20261028070404.1913843-3-
> vidya.srinivas@intel.com
> (cherry picked from commit 917676a55a690319a01b45d3956eaf94ba564df8)
> Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_dp.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c
> b/drivers/gpu/drm/i915/display/intel_dp.c
> index d8c0d9381471d..47741957935ae 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -477,9 +477,9 @@ bool intel_dp_has_joiner(struct intel_dp *intel_dp)
>  	    !connector->panel.vbt.edp.pipe_joiner_enable)
>  		return false;
> 
> -	return DISPLAY_VER(display) >= 12 ||
> +	return ((DISPLAY_VER(display) >= 12 && DISPLAY_VERx100(display) !=
> +3002) ||
>  		(DISPLAY_VER(display) == 11 &&
> -		 encoder->port != PORT_A);
> +		 encoder->port != PORT_A));
>  }
> 
>  static int dg2_max_source_rate(struct intel_dp *intel_dp)
> --
> 2.53.0
> 
> 
>