Commit: c2f7c825fcb14fd735d65918df00e0bdb541824a - kernel (git)

kernel

Commit MetaInfo

• Revision: c2f7c825fcb14fd735d65918df00e0bdb541824a (tree)
• Time: 2019-06-13 01:04:55
• Author: lambdadroid <lambdadroid@gmai...>
• Commiter: Chih-Wei Huang

Log Message

drm/i915: Change maximum brightness for CRC PWM to 255

The Crystalcove (CRC) PMIC PWM driver supports 255 levels.
Currently, these are mapped to a percentage, making it impossible
to choose all available brightness levels. Change the maximum
brightness level to 255 so all available levels can be used.

Change Summary

• modified: drivers/gpu/drm/i915/intel_panel.c

Incremental Difference

--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -524,7 +524,7 @@ static u32 pwm_get_backlight(struct intel_connector *connector)
 	int duty_ns;
 
 	duty_ns = pwm_get_duty_cycle(panel->backlight.pwm);
-	return DIV_ROUND_UP(duty_ns * 100, CRC_PMIC_PWM_PERIOD_NS);
+	return DIV_ROUND_UP(duty_ns * panel->backlight.max, CRC_PMIC_PWM_PERIOD_NS);
 }
 
 static void lpt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
@@ -597,7 +597,7 @@ static void bxt_set_backlight(const struct drm_connector_state *conn_state, u32
 static void pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 {
 	struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
-	int duty_ns = DIV_ROUND_UP(level * CRC_PMIC_PWM_PERIOD_NS, 100);
+	int duty_ns = DIV_ROUND_UP(level * CRC_PMIC_PWM_PERIOD_NS, panel->backlight.max);
 
 	pwm_config(panel->backlight.pwm, duty_ns, CRC_PMIC_PWM_PERIOD_NS);
 }
@@ -1763,10 +1763,10 @@ static int pwm_setup_backlight(struct intel_connector *connector,
 		return retval;
 	}
 
-	panel->backlight.min = 0; /* 0% */
-	panel->backlight.max = 100; /* 100% */
+	panel->backlight.min = 0;
+	panel->backlight.max = 0xFF;
 	panel->backlight.level = DIV_ROUND_UP(
-				 pwm_get_duty_cycle(panel->backlight.pwm) * 100,
+				 pwm_get_duty_cycle(panel->backlight.pwm) * panel->backlight.max,
 				 CRC_PMIC_PWM_PERIOD_NS);
 	panel->backlight.enabled = panel->backlight.level != 0;