drm/i915: assert panel is unlocked before writing transcoder timing regs
Otherwise our writes will be silently ignored.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 515e0b9..f274d5b 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2444,7 +2444,8 @@
I915_WRITE(PCH_DPLL_SEL, temp);
}
- /* set transcoder timing */
+ /* set transcoder timing, panel must allow it */
+ assert_panel_unlocked(dev_priv, pipe);
I915_WRITE(TRANS_HTOTAL(pipe), I915_READ(HTOTAL(pipe)));
I915_WRITE(TRANS_HBLANK(pipe), I915_READ(HBLANK(pipe)));
I915_WRITE(TRANS_HSYNC(pipe), I915_READ(HSYNC(pipe)));