Re: [PATCH resend 1/2] drm/i915: panel: Use intel_panel_compute_brightness() from pwm_setup_backlight()

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Hi All,

On 2/21/20 6:29 PM, Hans de Goede wrote:
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@xxxxxxxxxx>

ping? Any chance I can get a review from someone on this series?

Both patches are pretty trivial really...

Regards,

Hans



---
  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 7b3ec6eb3382..9ebee7d93414 100644
--- a/drivers/gpu/drm/i915/display/intel_panel.c
+++ b/drivers/gpu/drm/i915/display/intel_panel.c
@@ -1843,6 +1843,7 @@ static int pwm_setup_backlight(struct intel_connector *connector,
  	struct drm_i915_private *dev_priv = to_i915(dev);
  	struct intel_panel *panel = &connector->panel;
  	const char *desc;
+	u32 level, ns;
  	int retval;
/* Get the right PWM chip for DSI backlight according to VBT */
@@ -1866,8 +1867,12 @@ 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);
@@ -1875,11 +1880,10 @@ 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;
DRM_INFO("Using %s PWM for LCD backlight control\n", desc);


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