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drm/i915: panel: Honor the VBT PWM min setting for devs with an external PWM controller

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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.

Acked-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200903112337.4113-17-hdegoede@redhat.com
This commit is contained in:
Hans de Goede 2020-09-03 13:23:36 +02:00
parent 6b51e7d23a
commit 9a6ae5b354
1 changed files with 4 additions and 3 deletions
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7
drivers/gpu/drm/i915/display/intel_panel.c
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@ -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",