[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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