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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>
This commit is contained in:
Jesse Barnes 2012-01-12 14:51:17 -08:00 committed by Keith Packard
parent a190d703f0
commit 7885d2052b
1 changed files with 8 additions and 5 deletions
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13
drivers/gpu/drm/i915/intel_display.c
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@ -5808,12 +5808,15 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
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;