diff options
| author | Dave Airlie <airlied@redhat.com> | 2013-08-09 09:09:37 +1000 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2013-08-09 09:09:37 +1000 |
| commit | e42f5814212079aecd5826dba10588a896ac0862 (patch) | |
| tree | c12e30ac9094addc09f2a636720ba9ab85f820a3 /drivers/gpu/drm/i915/intel_panel.c | |
| parent | e91abf80a0998f326107874c88d549f94839f13c (diff) | |
| parent | 3f577573cd5482a32f85bd131e52f7cb4b9ac518 (diff) | |
Merge tag 'drm-intel-fixes-2013-08-08' of git://people.freedesktop.org/~danvet/drm-intel into drm-fixes
Daniel writes:
A few bugfixes for serious stuff and regressions. Highlight is the
reinstated hack to keep the i915 backlight on when running on an optimus
machine, this prevents black screens especially with some radeon muxed
platforms. And the patch to quiet dmesg on Linus' old mac mini ;-)
* tag 'drm-intel-fixes-2013-08-08' of git://people.freedesktop.org/~danvet/drm-intel:
drm/i915: do not disable backlight on vgaswitcheroo switch off
drm/i915: Don't call encoder's get_config unless encoder is active
drm/i915: avoid brightness overflow when doing scale
drm/i915: update last_vblank when disabling the power well
drm/i915: fix gen4 digital port hotplug definitions
Diffstat (limited to 'drivers/gpu/drm/i915/intel_panel.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_panel.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c index 67e2c1f1c9a..5950888ae1d 100644 --- a/drivers/gpu/drm/i915/intel_panel.c +++ b/drivers/gpu/drm/i915/intel_panel.c @@ -497,8 +497,11 @@ void intel_panel_set_backlight(struct drm_device *dev, u32 level, u32 max) goto out; } - /* scale to hardware */ - level = level * freq / max; + /* scale to hardware, but be careful to not overflow */ + if (freq < max) + level = level * freq / max; + else + level = freq / max * level; dev_priv->backlight.level = level; if (dev_priv->backlight.device) @@ -515,6 +518,17 @@ void intel_panel_disable_backlight(struct drm_device *dev) struct drm_i915_private *dev_priv = dev->dev_private; unsigned long flags; + /* + * Do not disable backlight on the vgaswitcheroo path. When switching + * away from i915, the other client may depend on i915 to handle the + * backlight. This will leave the backlight on unnecessarily when + * another client is not activated. + */ + if (dev->switch_power_state == DRM_SWITCH_POWER_CHANGING) { + DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n"); + return; + } + spin_lock_irqsave(&dev_priv->backlight.lock, flags); dev_priv->backlight.enabled = false; |