Set pwmgen_bit_count to have proper brightness inc/dec steps even when driver_pwm_freq_hz (optional) is zero. cat /sys/class/backlight/nv_backlight/max_brightness 255 Can now tune properly backlight from 0 to 255. --- Changes for v2: none Signed-off-by: Angelo Dureghello <angelo@xxxxxxxxxxxxxxxx> --- drivers/gpu/drm/display/drm_dp_helper.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c index f5d4be897866..30c4ed0f2ff1 100644 --- a/drivers/gpu/drm/display/drm_dp_helper.c +++ b/drivers/gpu/drm/display/drm_dp_helper.c @@ -3768,6 +3768,7 @@ drm_edp_backlight_probe_max(struct drm_dp_aux *aux, struct drm_edp_backlight_inf } pn &= DP_EDP_PWMGEN_BIT_COUNT_MASK; + bl->pwmgen_bit_count = pn; bl->max = (1 << pn) - 1; if (!driver_pwm_freq_hz) return 0; -- 2.44.0
