[SRU][quantal][patch] UBUNTU: SAUCE: (no-up) drm/i915: i915.disable_pch_pwm overrides PCH_PWM_ENABLE quirk
Kamal Mostafa
kamal at canonical.com
Tue Nov 19 19:58:32 UTC 2013
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=47941
BugLink: https://bugs.launchpad.net/bugs/1163720
Some BIOS configurations of Dell XPS13 are adversely affected by e85843b
("drm/i915: quirk no PCH_PWM_ENABLE for Dell XPS13 backlight") so provide a
boot param to inhibit the quirk, or force it on.
i915.disable_pch_pwm can be set to
-1: auto (default; allows the disabling of pch_pwm by dmi quirk table match)
0: inhibits the disabling of pch_pwm (overrides dmi quirk table match)
1: forces the disabling of pch_pwm
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
drivers/gpu/drm/i915/i915_drv.c | 4 ++++
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/intel_display.c | 11 ++++++++---
3 files changed, 13 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 88353cc..55c587b 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -118,6 +118,10 @@ module_param_named(i915_enable_ppgtt, i915_enable_ppgtt, int, 0600);
MODULE_PARM_DESC(i915_enable_ppgtt,
"Enable PPGTT (default: true)");
+int i915_disable_pch_pwm __read_mostly = -1;
+module_param_named(disable_pch_pwm, i915_disable_pch_pwm, int, 0600);
+MODULE_PARM_DESC(disable_pch_pwm, "disable PCH_PWM (default: -1 (auto))");
+
static struct drm_driver driver;
extern int intel_agp_enabled;
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 612fe15..d629c67 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1149,6 +1149,7 @@ extern int i915_enable_rc6 __read_mostly;
extern int i915_enable_fbc __read_mostly;
extern bool i915_enable_hangcheck __read_mostly;
extern int i915_enable_ppgtt __read_mostly;
+extern int i915_disable_pch_pwm __read_mostly;
extern int i915_suspend(struct drm_device *dev, pm_message_t state);
extern int i915_resume(struct drm_device *dev);
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 757424f..887eed3 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6887,9 +6887,8 @@ static void quirk_rc6_force_disable(struct drm_device *dev)
*/
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");
+ if (i915_disable_pch_pwm < 0)
+ i915_disable_pch_pwm = 1;
}
struct intel_quirk {
@@ -6999,6 +6998,12 @@ static void intel_init_quirks(struct drm_device *dev)
if (dmi_check_system(*intel_dmi_quirks[i].dmi_id_list) != 0)
intel_dmi_quirks[i].hook(dev);
}
+
+ if (i915_disable_pch_pwm == 1) {
+ 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");
+ }
}
/* Disable the VGA plane that we never use */
--
1.8.1.2
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