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drm/i915/lvds: Connect the PWM to the LVDS pipe

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... and do not just assume to always use pipe B.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2010-12-03 20:17:19 +00:00
parent b9e68670cc
commit 17fe698110
1 changed files with 11 additions and 3 deletions
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14
drivers/gpu/drm/i915/intel_lvds.c
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@ -1012,10 +1012,18 @@ bool intel_lvds_init(struct drm_device *dev)
out:
if (HAS_PCH_SPLIT(dev)) {
u32 pwm;
/* make sure PWM is enabled */
pipe = (I915_READ(PCH_LVDS) & LVDS_PIPEB_SELECT) ? 1 : 0;
/* make sure PWM is enabled and locked to the LVDS pipe */
pwm = I915_READ(BLC_PWM_CPU_CTL2);
pwm |= (PWM_ENABLE | PWM_PIPE_B);
I915_WRITE(BLC_PWM_CPU_CTL2, pwm);
if (pipe == 0 && (pwm & PWM_PIPE_B))
I915_WRITE(BLC_PWM_CPU_CTL2, pwm & ~PWM_ENABLE);
if (pipe)
pwm |= PWM_PIPE_B;
else
pwm &= ~PWM_PIPE_B;
I915_WRITE(BLC_PWM_CPU_CTL2, pwm | PWM_ENABLE);
pwm = I915_READ(BLC_PWM_PCH_CTL1);
pwm |= PWM_PCH_ENABLE;