[PATCH 7/7] drm/i915/dp: Limit brightness level to 20

[Suraj Kandpal]

Limit minimum brightness to 20 when using aux based brightness
control to avoid letting the screen going completely blank.

Signed-off-by: Suraj Kandpal <suraj.kandpal at intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
index 20dd5a6a0f3f..b54ea7e46954 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
@@ -211,6 +211,9 @@ intel_dp_aux_hdr_set_aux_backlight(const struct drm_connector_state *conn_state,
 	struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
 	u8 buf[4] = {};
 
+	if (level < 20)
+		level = 20;
+
 	buf[0] = level & 0xFF;
 	buf[1] = (level & 0xFF00) >> 8;
 
-- 
2.43.2