[Intel-gfx] [PATCH] drm/i915: don't warn if backlight unexpectedly enabled

[Scot Doyle]

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 at intel.com>
Signed-off-by: Scot Doyle <lkml14 at scotdoyle.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 59b028f..8e37444 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -801,7 +801,7 @@ 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);
 	}
@@ -845,7 +845,7 @@ 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);
 	}

@@ -876,7 +876,7 @@ 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);
 	}
@@ -910,7 +910,7 @@ 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);
 	}