[Intel-gfx] [PATCH 1/2] drm/i915: panel: Use intel_panel_compute_brightness() from pwm_setup_backlight()

[Hans de Goede]

Use intel_panel_compute_brightness() from pwm_setup_backlight() so that
we correctly take i915_modparams.invert_brightness and/or
QUIRK_INVERT_BRIGHTNESS into account when setting + getting the initial
brightness value.

Signed-off-by: Hans de Goede <hdegoede at redhat.com>
---
 drivers/gpu/drm/i915/display/intel_panel.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_panel.c b/drivers/gpu/drm/i915/display/intel_panel.c
index 6f3eaae3761f..c43b7cea2b58 100644
--- a/drivers/gpu/drm/i915/display/intel_panel.c
+++ b/drivers/gpu/drm/i915/display/intel_panel.c
@@ -1841,6 +1841,7 @@ static int pwm_setup_backlight(struct intel_connector *connector,
 {
 	struct drm_device *dev = connector->base.dev;
 	struct intel_panel *panel = &connector->panel;
+	u32 level, ns;
 	int retval;
 
 	/* Get the PWM chip for backlight control */
@@ -1857,8 +1858,12 @@ static int pwm_setup_backlight(struct intel_connector *connector,
 	 */
 	pwm_apply_args(panel->backlight.pwm);
 
-	retval = pwm_config(panel->backlight.pwm, CRC_PMIC_PWM_PERIOD_NS,
-			    CRC_PMIC_PWM_PERIOD_NS);
+	panel->backlight.min = 0; /* 0% */
+	panel->backlight.max = 100; /* 100% */
+	level = intel_panel_compute_brightness(connector, 100);
+	ns = DIV_ROUND_UP(level * CRC_PMIC_PWM_PERIOD_NS, 100);
+
+	retval = pwm_config(panel->backlight.pwm, ns, CRC_PMIC_PWM_PERIOD_NS);
 	if (retval < 0) {
 		DRM_ERROR("Failed to configure the pwm chip\n");
 		pwm_put(panel->backlight.pwm);
@@ -1866,11 +1871,10 @@ static int pwm_setup_backlight(struct intel_connector *connector,
 		return retval;
 	}
 
-	panel->backlight.min = 0; /* 0% */
-	panel->backlight.max = 100; /* 100% */
-	panel->backlight.level = DIV_ROUND_UP(
-				 pwm_get_duty_cycle(panel->backlight.pwm) * 100,
-				 CRC_PMIC_PWM_PERIOD_NS);
+	level = DIV_ROUND_UP(pwm_get_duty_cycle(panel->backlight.pwm) * 100,
+			     CRC_PMIC_PWM_PERIOD_NS);
+	panel->backlight.level =
+		intel_panel_compute_brightness(connector, level);
 	panel->backlight.enabled = panel->backlight.level != 0;
 
 	return 0;
-- 
2.23.0