drm/amd/display: Block 3D Timings

- we don't yet support 3D timings in DAL3
- somehow a code path was being executed that resulted in HW programming
for a 3D timing, which caused 3D displays to show half the desktop in one
frame, and the other half of the desktop in the next frame
- blocking all 3D timings in timing generator validation until we
implement proper 3D timing support

Signed-off-by: Joshua Aberback <Joshua.Aberback@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/dce110/dce110_timing_generator.c b/drivers/gpu/drm/amd/display/dc/dce110/dce110_timing_generator.c
index b1c9712..12a2587 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_timing_generator.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_timing_generator.c
@@ -1113,6 +1113,10 @@ bool dce110_timing_generator_validate_timing(
        if (!timing)
                return false;
 
+       /* Currently we don't support 3D, so block all 3D timings */
+       if (timing->timing_3d_format != TIMING_3D_FORMAT_NONE)
+               return false;
+
        /* Check maximum number of pixels supported by Timing Generator
         * (Currently will never fail, in order to fail needs display which
         * needs more than 8192 horizontal and