Attachment 78083 Details for Bug 61115 – Don't clamp backlight when disabling on gen4+

[patch] Don't clamp backlight when disabling on gen4+

0001-drm-i915-Don-t-clamp-backlight-when-disabling-on-gen.patch (text/plain), 1.57 KB, created by Daniel Vetter on 2013-04-16 13:41:21 UTC

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Creator: Daniel Vetter

Created: 2013-04-16 13:41:21 UTC

Size: 1.57 KB

patch

obsolete

>From 4c8c1e0790615062eb423c20bd9fd37279f3d5f0 Mon Sep 17 00:00:00 2001
>From: Daniel Vetter <daniel.vetter@ffwll.ch>
>Date: Tue, 16 Apr 2013 15:40:37 +0200
>Subject: [PATCH] drm/i915: Don't clamp backlight when disabling on gen4+
>
>Hopefully this solves the various "backlight is dead" issues on
>multi-gpu setups where the intel backlight controls have control over
>the lcd panel even when the intel gpu is _not_ in control of the lvds
>output.
>
>Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=55311
>Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=59785
>Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=61115
>Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
>---
> drivers/gpu/drm/i915/intel_panel.c |    5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
>diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
>index eb5e6e9..8e8bb40 100644
>--- a/drivers/gpu/drm/i915/intel_panel.c
>+++ b/drivers/gpu/drm/i915/intel_panel.c
>@@ -299,7 +299,6 @@ void intel_panel_disable_backlight(struct drm_device *dev)
> 	struct drm_i915_private *dev_priv = dev->dev_private;
> 
> 	dev_priv->backlight.enabled = false;
>-	intel_panel_actually_set_backlight(dev, 0);
> 
> 	if (INTEL_INFO(dev)->gen >= 4) {
> 		uint32_t reg, tmp;
>@@ -313,6 +312,10 @@ void intel_panel_disable_backlight(struct drm_device *dev)
> 			tmp &= ~BLM_PCH_PWM_ENABLE;
> 			I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
> 		}
>+	} else {
>+		/* pre-gen4 doesn't have a separate enable bit so we need to
>+		 * smash the actual backlight pwm to 0 */
>+		intel_panel_actually_set_backlight(dev, 0);
> 	}
> }
> 
>-- 
>1.7.10.4
>

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Attachments on bug 61115: 76163 | 76164 | 78083

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