If the backlight modulation frequency can't be extracted from the
registers or from VBT, use 200 Hz as the default. This may enable
backlight on some machines that previously failed.
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_panel.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index 2d1696386b0d..2b25497333de 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -1393,14 +1393,18 @@ static u32 get_backlight_max_vbt(struct intel_connector *connector)
u16 pwm_freq_hz = dev_priv->vbt.backlight.pwm_freq_hz;
u32 pwm;
- if (!pwm_freq_hz) {
- DRM_DEBUG_KMS("backlight frequency not specified in VBT\n");
+ if (!panel->backlight.hz_to_pwm) {
+ DRM_DEBUG_KMS("backlight frequency conversion not supported\n");
return 0;
}
- if (!panel->backlight.hz_to_pwm) {
- DRM_DEBUG_KMS("backlight frequency setting from VBT currently not supported on this platform\n");
- return 0;
+ if (pwm_freq_hz) {
+ DRM_DEBUG_KMS("VBT defined backlight frequency %u Hz\n",
+ pwm_freq_hz);
+ } else {
+ pwm_freq_hz = 200;
+ DRM_DEBUG_KMS("default backlight frequency %u Hz\n",
+ pwm_freq_hz);
}
pwm = panel->backlight.hz_to_pwm(connector, pwm_freq_hz);
@@ -1409,8 +1413,6 @@ static u32 get_backlight_max_vbt(struct intel_connector *connector)
return 0;
}
- DRM_DEBUG_KMS("backlight frequency %u Hz from VBT\n", pwm_freq_hz);
-
return pwm;
}
--
2.1.4
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