From: Paulo Zanoni Date: Sat, 14 Jul 2012 14:57:12 +0000 (-0300) Subject: drm/i915: don't forget the PCH backlight registers X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a4f32fc3a37e982fffce8ec583643990ff288419;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git drm/i915: don't forget the PCH backlight registers When we enable/disable the CPU backlight registers we can't forget to enable/disable the PCH backlight registers. Since we're using the CPU registers we should also unset the override bit. Fixes a regression on the following commit: drm/i915: properly enable the blc controller on the right pipe The commit just deleted the code that sets the PCH registers, so it was relying on the values set by the BIOS. I told my BIOS to boot on the DVI monitor instead of the LVDS panel, so I noticed the bug. Signed-off-by: Paulo Zanoni Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c index 58c7ee7238b8..10c7d39034e1 100644 --- a/drivers/gpu/drm/i915/intel_panel.c +++ b/drivers/gpu/drm/i915/intel_panel.c @@ -289,11 +289,17 @@ void intel_panel_disable_backlight(struct drm_device *dev) intel_panel_actually_set_backlight(dev, 0); if (INTEL_INFO(dev)->gen >= 4) { - uint32_t reg; + uint32_t reg, tmp; reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2; I915_WRITE(reg, I915_READ(reg) & ~BLM_PWM_ENABLE); + + if (HAS_PCH_SPLIT(dev)) { + tmp = I915_READ(BLC_PWM_PCH_CTL1); + tmp &= ~BLM_PCH_PWM_ENABLE; + I915_WRITE(BLC_PWM_PCH_CTL1, tmp); + } } } @@ -333,6 +339,13 @@ void intel_panel_enable_backlight(struct drm_device *dev, I915_WRITE(reg, tmp); POSTING_READ(reg); I915_WRITE(reg, tmp | BLM_PWM_ENABLE); + + if (HAS_PCH_SPLIT(dev)) { + tmp = I915_READ(BLC_PWM_PCH_CTL1); + tmp |= BLM_PCH_PWM_ENABLE; + tmp &= ~BLM_PCH_OVERRIDE_ENABLE; + I915_WRITE(BLC_PWM_PCH_CTL1, tmp); + } } }