From e85843bec6c2ea7c10ec61238396891cc2b753a9 Mon Sep 17 00:00:00 2001 From: Kamal Mostafa Date: Fri, 19 Jul 2013 15:02:01 -0700 Subject: 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 Tested-by: Kent Baxley Cc: # v3.8+ Signed-off-by: Kamal Mostafa Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_panel.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/gpu/drm/i915/intel_panel.c') diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c index 45010bb5d13..67e2c1f1c9a 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; -- cgit v1.2.3