drm/i915: mask transcoder select bits before setting them on LVDS
The transcoder port may changed from mode set to mode set, so make sure
to mask out the selection bits before setting the right ones or we'll
get black screens when going from transcoder B to A.
Tested-by: Vincent Vanackere <vincent.vanackere@gmail.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Keith Packard <keithp@keithp.com>
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 2a3f707..96cea08 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5808,12 +5808,15 @@
if (is_lvds) {
temp = I915_READ(PCH_LVDS);
temp |= LVDS_PORT_EN | LVDS_A0A2_CLKA_POWER_UP;
- if (HAS_PCH_CPT(dev))
+ if (HAS_PCH_CPT(dev)) {
+ temp &= ~PORT_TRANS_SEL_MASK;
temp |= PORT_TRANS_SEL_CPT(pipe);
- else if (pipe == 1)
- temp |= LVDS_PIPEB_SELECT;
- else
- temp &= ~LVDS_PIPEB_SELECT;
+ } else {
+ if (pipe == 1)
+ temp |= LVDS_PIPEB_SELECT;
+ else
+ temp &= ~LVDS_PIPEB_SELECT;
+ }
/* set the corresponsding LVDS_BORDER bit */
temp |= dev_priv->lvds_border_bits;