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| author | Kamal Mostafa <kamal@canonical.com> | 2013-07-19 15:02:01 -0700 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2013-07-20 10:52:53 +0200 |
| commit | e85843bec6c2ea7c10ec61238396891cc2b753a9 (patch) | |
| tree | 27e7e17dab67a95cc87bd1dd75049c83ea4915a7 /drivers/gpu/drm/i915/intel_panel.c | |
| parent | 94a335dba34ff47cad3d6d0c29b452d43a1be3c8 (diff) | |
| download | blackbird-op-linux-e85843bec6c2ea7c10ec61238396891cc2b753a9.tar.gz blackbird-op-linux-e85843bec6c2ea7c10ec61238396891cc2b753a9.zip | |
drm/i915: quirk no PCH_PWM_ENABLE for Dell XPS13 backlight
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=47941
BugLink: https://bugs.launchpad.net/bugs/1163720
BugLink: https://bugs.launchpad.net/bugs/1162026
Some machines suffer from non-functional backlight controls if
BLM_PCH_PWM_ENABLE is set, so provide a quirk to avoid doing so.
Apply this quirk to Dell XPS 13 models.
Tested-by: Eric Griffith <EGriffith92@gmail.com>
Tested-by: Kent Baxley <kent.baxley@canonical.com>
Cc: <stable@vger.kernel.org> # v3.8+
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_panel.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_panel.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c index 45010bb5d132..67e2c1f1c9a8 100644 --- a/drivers/gpu/drm/i915/intel_panel.c +++ b/drivers/gpu/drm/i915/intel_panel.c @@ -583,7 +583,8 @@ void intel_panel_enable_backlight(struct drm_device *dev, POSTING_READ(reg); I915_WRITE(reg, tmp | BLM_PWM_ENABLE); - if (HAS_PCH_SPLIT(dev)) { + if (HAS_PCH_SPLIT(dev) && + !(dev_priv->quirks & QUIRK_NO_PCH_PWM_ENABLE)) { tmp = I915_READ(BLC_PWM_PCH_CTL1); tmp |= BLM_PCH_PWM_ENABLE; tmp &= ~BLM_PCH_OVERRIDE_ENABLE; |
