Commit e5a95eb7 authored by Zhao Yakui's avatar Zhao Yakui Committed by Eric Anholt

drm/i915: Select the correct BPC for LVDS on Ironlake

Select the correct BPC for LVDS on Ironlake. If it is 18-bit LVDS panel,
the BPC will be 6. When it is 24-bit LVDS panel, the BPC will 8.
At the same time the BPC will be 8 when the output device is CRT/HDMI/DP.
Signed-off-by: default avatarZhao Yakui <yakui.zhao@intel.com>
Signed-off-by: default avatarEric Anholt <eric@anholt.net>
parent 8faf3b31
......@@ -2993,6 +2993,18 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
/* determine panel color depth */
temp = I915_READ(pipeconf_reg);
temp &= ~PIPE_BPC_MASK;
if (is_lvds) {
int lvds_reg = I915_READ(PCH_LVDS);
/* the BPC will be 6 if it is 18-bit LVDS panel */
if ((lvds_reg & LVDS_A3_POWER_MASK) == LVDS_A3_POWER_UP)
temp |= PIPE_8BPC;
else
temp |= PIPE_6BPC;
} else
temp |= PIPE_8BPC;
I915_WRITE(pipeconf_reg, temp);
I915_READ(pipeconf_reg);
switch (temp & PIPE_BPC_MASK) {
case PIPE_8BPC:
......
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