[Intel-gfx] [PATCH] drm/i915: fix lvds/dp panel fitter setting

[Imre Deak]

If need to enable the panel fitter, the crtc timings have to be
programmed according to the panel's native (fixed) mode. This isn't the
case atm, since after the encoder changes adjusted_mode to fixed
mode the crtc_* timing fields of adjusted_mode will stay at their original
non-native values that the user passed in. This results in a corrupted
output.

One exception is when we have a second pass of computing encoder configs
due to bandwidth limitation, since then we'll set adjusted_mode.crtc_*
fields to the fixed mode values set in the first pass; so in this case
things will work out.

Fix this by updating the adjusted_mode.crtc_* fields when we set the
fixed panel mode.

Signed-off-by: Imre Deak <imre.deak at intel.com>
---
 drivers/gpu/drm/i915/intel_panel.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index a43c33b..913cb9d 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -50,6 +50,8 @@ intel_fixed_panel_mode(struct drm_display_mode *fixed_mode,
 	adjusted_mode->vtotal = fixed_mode->vtotal;
 
 	adjusted_mode->clock = fixed_mode->clock;
+
+	drm_mode_set_crtcinfo(adjusted_mode, 0);
 }
 
 /* adjusted_mode has been preset to be the panel's fixed mode */
-- 
1.8.3.2