[PATCH 6.6 248/396] drm/amd/display: handle range offsets in VRR ranges

Greg Kroah-Hartman
2024-04-01T16:49:56Z

From: Alex Deucher <alexander.deucher@amd.com>

commit 937844d661354bf142dc1c621396fdab10ecbacc upstream.

Need to check the offset bits for values greater than 255.

v2: also update amdgpu_dm_connector values.

Suggested-by: Mano Ségransan <mano.segransan@protonmail.com>
Tested-by: Mano Ségransan <mano.segransan@protonmail.com>
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3203
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 19 ++++++++++++++-----
1 file changed, 14 insertions(+), 5 deletions(-)

--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -10783,14 +10783,23 @@ void amdgpu_dm_update_freesync_caps(stru
if (range->flags != 1)
continue;

- amdgpu_dm_connector->min_vfreq = range->min_vfreq;
- amdgpu_dm_connector->max_vfreq = range->max_vfreq;
- amdgpu_dm_connector->pixel_clock_mhz =
- range->pixel_clock_mhz * 10;
-
connector->display_info.monitor_range.min_vfreq = range->min_vfreq;
connector->display_info.monitor_range.max_vfreq = range->max_vfreq;

+ if (edid->revision >= 4) {
+ if (data->pad2 & DRM_EDID_RANGE_OFFSET_MIN_VFREQ)
+ connector->display_info.monitor_range.min_vfreq += 255;
+ if (data->pad2 & DRM_EDID_RANGE_OFFSET_MAX_VFREQ)
+ connector->display_info.monitor_range.max_vfreq += 255;
+ }
+
+ amdgpu_dm_connector->min_vfreq =
+ connector->display_info.monitor_range.min_vfreq;
+ amdgpu_dm_connector->max_vfreq =
+ connector->display_info.monitor_range.max_vfreq;
+ amdgpu_dm_connector->pixel_clock_mhz =
+ range->pixel_clock_mhz * 10;
+
break;
}