[Intel-gfx] [PATCH] drm/i915: Print pwm device-name when using pwm for backlight control

[Hans de Goede]

On Bay Trail devices either the Crystal Cove PMIC's pwm or the LPSS'
pwm is used to control the backlight. Other drivers take core of
providing a backlight_pwm alias through pwm_add_table, but it is
still useful to know which pwm device actually ends up being used
for debugging backlight issues, so add a DRM_INFO logging the
pwm device-name.

Signed-off-by: Hans de Goede <hdegoede at redhat.com>
---
 drivers/gpu/drm/i915/intel_panel.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index cb50c527401f..7936a64af393 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -1670,6 +1670,9 @@ static int pwm_setup_backlight(struct intel_connector *connector,
 				 CRC_PMIC_PWM_PERIOD_NS);
 	panel->backlight.enabled = panel->backlight.level != 0;
 
+	DRM_INFO("Using %s pwm-device for backlight control\n",
+		 dev_name(panel->backlight.pwm->chip->dev));
+
 	return 0;
 }
 
-- 
2.13.0