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

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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: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Zhao Yakui 2010-01-04 16:29:32 +08:00 committed by Eric Anholt
parent 8faf3b3174
commit e5a95eb778
1 changed files with 12 additions and 0 deletions
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12
drivers/gpu/drm/i915/intel_display.c
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@ -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: