drm/i915: quirk no PCH_PWM_ENABLE for Dell XPS13 backlight

commit e85843bec6c2ea7c10ec61238396891cc2b753a9 upstream.

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>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
[ kamal: backport to 3.2 ]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 144d37c..61274bf 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -275,6 +275,7 @@ enum intel_pch {
 #define QUIRK_PIPEA_FORCE (1<<0)
 #define QUIRK_LVDS_SSC_DISABLE (1<<1)
 #define QUIRK_INVERT_BRIGHTNESS (1<<2)
+#define QUIRK_NO_PCH_PWM_ENABLE (1<<3)
 
 struct intel_fbdev;
 struct intel_fbc_work;

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index cfbb893..ee29c1f 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -8842,6 +8842,17 @@ static void quirk_invert_brightness(struct drm_device *dev)
        dev_priv->quirks |= QUIRK_INVERT_BRIGHTNESS;
 }
 
+/*
+ * Some machines (Dell XPS13) suffer broken backlight controls if
+ * BLM_PCH_PWM_ENABLE is set.
+ */
+static void quirk_no_pcm_pwm_enable(struct drm_device *dev)
+{
+       struct drm_i915_private *dev_priv = dev->dev_private;
+       dev_priv->quirks |= QUIRK_NO_PCH_PWM_ENABLE;
+       DRM_INFO("applying no-PCH_PWM_ENABLE quirk\n");
+}
+
 struct intel_quirk {
        int device;
        int subsystem_vendor;
@@ -8916,6 +8927,11 @@ struct intel_quirk intel_quirks[] = {
 
        /* Acer/Packard Bell NCL20 */
        { 0x2a42, 0x1025, 0x034b, quirk_invert_brightness },
+
+       /* Dell XPS13 HD Sandy Bridge */
+       { 0x0116, 0x1028, 0x052e, quirk_no_pcm_pwm_enable },
+       /* Dell XPS13 HD and XPS13 FHD Ivy Bridge */
+       { 0x0166, 0x1028, 0x058b, quirk_no_pcm_pwm_enable },
 };
 
 static void intel_init_quirks(struct drm_device *dev)

diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index 2ffa740..744dccf 100644 (file)
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -1075,7 +1075,8 @@ bool intel_lvds_init(struct drm_device *dev)
                goto failed;
 
 out:
-       if (HAS_PCH_SPLIT(dev)) {
+       if (HAS_PCH_SPLIT(dev) &&
+           !(dev_priv->quirks & QUIRK_NO_PCH_PWM_ENABLE)) {
                u32 pwm;
 
                pipe = (I915_READ(PCH_LVDS) & LVDS_PIPEB_SELECT) ? 1 : 0;