So far for devices using an external PWM controller (devices using
pwm_setup_backlight()), we have been hardcoding the minimum allowed
PWM level to 0. But several of these devices specify a non 0 minimum
setting in their VBT.
Change pwm_setup_backlight() to use get_backlight_min_vbt() to get
the minimum level.
Signed-off-by: Hans de Goede <hdego...@redhat.com>
---
drivers/gpu/drm/i915/display/intel_panel.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_panel.c
b/drivers/gpu/drm/i915/display/intel_panel.c
index 14e611c92194..cb28b9908ca4 100644
--- a/drivers/gpu/drm/i915/display/intel_panel.c
+++ b/drivers/gpu/drm/i915/display/intel_panel.c
@@ -1925,8 +1925,8 @@ static int pwm_setup_backlight(struct intel_connector
*connector,
*/
pwm_apply_args(panel->backlight.pwm);
- panel->backlight.min = 0; /* 0% */
panel->backlight.max = 100; /* 100% */
+ panel->backlight.min = get_backlight_min_vbt(connector);
level = intel_panel_compute_brightness(connector, 100);
ns = DIV_ROUND_UP(level * panel->backlight.pwm_period_ns, 100);
@@ -1941,8 +1941,9 @@ static int pwm_setup_backlight(struct intel_connector
*connector,
level = DIV_ROUND_UP(pwm_get_duty_cycle(panel->backlight.pwm) * 100,
panel->backlight.pwm_period_ns);
- panel->backlight.level =
- intel_panel_compute_brightness(connector, level);
+ level = intel_panel_compute_brightness(connector, level);
+ panel->backlight.level = clamp(level, panel->backlight.min,
+ panel->backlight.max);
panel->backlight.enabled = panel->backlight.level != 0;
drm_info(&dev_priv->drm, "Using %s PWM for LCD backlight control\n",
--
2.26.2
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