[PATCH 3.16.y-ckt 001/216] drm/i915: don't warn if backlight unexpectedly enabled

Luis Henriques
2015-01-12T19:19:56Z

From: Scot Doyle <lkml14@scotdoyle.com>

commit 813008cd3e93ea8a571b2b7d5b9360a3105b50f7 upstream.

BIOS or firmware can modify hardware state during suspend/resume,
for example on the Toshiba CB35 or Lenovo T400, so log a debug message
instead of a warning if the backlight is unexpectedly enabled.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=80930
Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Scot Doyle <lkml14@scotdoyle.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Cc: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
---
drivers/gpu/drm/i915/intel_panel.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index 12b02fe1d0ae..59b294c5fe41 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -711,7 +711,7 @@ static void pch_enable_backlight(struct intel_connector *connector)

cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
if (cpu_ctl2 & BLM_PWM_ENABLE) {
- WARN(1, "cpu backlight already enabled\n");
+ DRM_DEBUG_KMS("cpu backlight already enabled\n");
cpu_ctl2 &= ~BLM_PWM_ENABLE;
I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
}
@@ -755,7 +755,7 @@ static void i9xx_enable_backlight(struct intel_connector *connector)

ctl = I915_READ(BLC_PWM_CTL);
if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
- WARN(1, "backlight already enabled\n");
+ DRM_DEBUG_KMS("backlight already enabled\n");
I915_WRITE(BLC_PWM_CTL, 0);
}

@@ -786,7 +786,7 @@ static void i965_enable_backlight(struct intel_connector *connector)

ctl2 = I915_READ(BLC_PWM_CTL2);
if (ctl2 & BLM_PWM_ENABLE) {
- WARN(1, "backlight already enabled\n");
+ DRM_DEBUG_KMS("backlight already enabled\n");
ctl2 &= ~BLM_PWM_ENABLE;
I915_WRITE(BLC_PWM_CTL2, ctl2);
}
@@ -820,7 +820,7 @@ static void vlv_enable_backlight(struct intel_connector *connector)

ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
if (ctl2 & BLM_PWM_ENABLE) {
- WARN(1, "backlight already enabled\n");
+ DRM_DEBUG_KMS("backlight already enabled\n");
ctl2 &= ~BLM_PWM_ENABLE;
I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
}
--
2.1.4