[PATCH] Debug backlight

Jani Nikula jani.nikula at intel.com
Wed Jan 30 12:30:03 UTC 2019


https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_5505/shard-iclb6/igt@pm_backlight@basic-brightness.html

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107820
Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 681e88405ada..ba142381f1f5 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -2738,19 +2738,27 @@ static void _intel_edp_backlight_off(struct intel_dp *intel_dp)
 	if (!intel_dp_is_edp(intel_dp))
 		return;
 
+	DRM_DEBUG_KMS("%s\n", __LINE__);
+
 	with_pps_lock(intel_dp, wakeref) {
 		i915_reg_t pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
 		u32 pp;
 
+		DRM_DEBUG_KMS("%s\n", __LINE__);
+
 		pp = ironlake_get_pp_control(intel_dp);
 		pp &= ~EDP_BLC_ENABLE;
 
 		I915_WRITE(pp_ctrl_reg, pp);
+		DRM_DEBUG_KMS("%s\n", __LINE__);
 		POSTING_READ(pp_ctrl_reg);
+		DRM_DEBUG_KMS("%s\n", __LINE__);
 	}
 
 	intel_dp->last_backlight_off = jiffies;
+	DRM_DEBUG_KMS("%s\n", __LINE__);
 	edp_wait_backlight_off(intel_dp);
+	DRM_DEBUG_KMS("%s\n", __LINE__);
 }
 
 /* Disable backlight PP control and backlight PWM. */
-- 
2.20.1



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