linux-kernel - [PATCH] drm/amd/display: fix missing .is_two_pixels_per

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Message-ID: <20250306103603.23350-1-aliaksei.urbanski@gmail.com>
Date: Thu,  6 Mar 2025 13:36:03 +0300
From: Aliaksei Urbanski <aliaksei.urbanski@...il.com>
To: Aliaksei Urbanski <aliaksei.urbanski@...il.com>
Cc: Wenjing Liu <wenjing.liu@....com>,
	Daniel Wheeler <daniel.wheeler@....com>,
	Alex Deucher <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>,
	Harry Wentland <harry.wentland@....com>,
	Leo Li <sunpeng.li@....com>,
	amd-gfx@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Rosen Penev <rosenp@...il.com>,
	stable@...r.kernel.org
Subject: [PATCH] drm/amd/display: fix missing .is_two_pixels_per_container

Starting from 6.11, AMDGPU driver, while being loaded with amdgpu.dc=1,
due to lack of .is_two_pixels_per_container function in dce60_tg_funcs,
causes a NULL pointer dereference on PCs with old GPUs, such as R9 280X.

So this fix adds missing .is_two_pixels_per_container to dce60_tg_funcs.

Reported-by: Rosen Penev <rosenp@...il.com>
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3942
Fixes: e6a901a00822 ("drm/amd/display: use even ODM slice width for two pixels per container")
Cc: <stable@...r.kernel.org> # 6.11+
Signed-off-by: Aliaksei Urbanski <aliaksei.urbanski@...il.com>
---
 drivers/gpu/drm/amd/display/dc/dce60/dce60_timing_generator.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/display/dc/dce60/dce60_timing_generator.c b/drivers/gpu/drm/amd/display/dc/dce60/dce60_timing_generator.c
index e5fb0e8333..e691a1cf33 100644
--- a/drivers/gpu/drm/amd/display/dc/dce60/dce60_timing_generator.c
+++ b/drivers/gpu/drm/amd/display/dc/dce60/dce60_timing_generator.c
@@ -239,6 +239,7 @@ static const struct timing_generator_funcs dce60_tg_funcs = {
 				dce60_timing_generator_enable_advanced_request,
 		.configure_crc = dce60_configure_crc,
 		.get_crc = dce110_get_crc,
+		.is_two_pixels_per_container = dce110_is_two_pixels_per_container,
 };
 
 void dce60_timing_generator_construct(
-- 
2.48.1