diff options
Diffstat (limited to 'drivers/gpu/drm/display/drm_dp_helper.c')
| -rw-r--r-- | drivers/gpu/drm/display/drm_dp_helper.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c index 1ecc3df7e316..4aaeae4fa03c 100644 --- a/drivers/gpu/drm/display/drm_dp_helper.c +++ b/drivers/gpu/drm/display/drm_dp_helper.c @@ -3962,6 +3962,7 @@ int drm_edp_backlight_set_level(struct drm_dp_aux *aux, const struct drm_edp_bac int ret; unsigned int offset = DP_EDP_BACKLIGHT_BRIGHTNESS_MSB; u8 buf[3] = { 0 }; + size_t len = 2; /* The panel uses the PWM for controlling brightness levels */ if (!(bl->aux_set || bl->luminance_set)) @@ -3974,6 +3975,7 @@ int drm_edp_backlight_set_level(struct drm_dp_aux *aux, const struct drm_edp_bac buf[1] = (level & 0x00ff00) >> 8; buf[2] = (level & 0xff0000) >> 16; offset = DP_EDP_PANEL_TARGET_LUMINANCE_VALUE; + len = 3; } else if (bl->lsb_reg_used) { buf[0] = (level & 0xff00) >> 8; buf[1] = (level & 0x00ff); @@ -3981,7 +3983,7 @@ int drm_edp_backlight_set_level(struct drm_dp_aux *aux, const struct drm_edp_bac buf[0] = level; } - ret = drm_dp_dpcd_write_data(aux, offset, buf, sizeof(buf)); + ret = drm_dp_dpcd_write_data(aux, offset, buf, len); if (ret < 0) { drm_err(aux->drm_dev, "%s: Failed to write aux backlight level: %d\n", |