[PATCH 040/103] drm/amd/display: fix bug in force_single_disp_pipe_split

[Harry Wentland]

From: Tony Cheng <tony.cheng at amd.com>

should only lower dpp clock.

Signed-off-by: Tony Cheng <tony.cheng at amd.com>
Reviewed-by: Yongqiang Sun <yongqiang.sun at amd.com>
Acked-by: Harry Wentland <Harry.Wentland at amd.com>
---
 drivers/gpu/drm/amd/display/dc/calcs/dcn_calcs.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/calcs/dcn_calcs.c b/drivers/gpu/drm/amd/display/dc/calcs/dcn_calcs.c
index aa56243f2522..cf474eb1cde8 100644
--- a/drivers/gpu/drm/amd/display/dc/calcs/dcn_calcs.c
+++ b/drivers/gpu/drm/amd/display/dc/calcs/dcn_calcs.c
@@ -732,11 +732,14 @@ void hack_disable_optional_pipe_split(struct dcn_bw_internal_vars *v)
 void hack_force_pipe_split(struct dcn_bw_internal_vars *v,
 		unsigned int pixel_rate_khz)
 {
+	float pixel_rate_mhz = pixel_rate_khz / 1000;
+
 	/*
 	 * force enabling pipe split by lower dpp clock for DPM0 to just
 	 * below the specify pixel_rate, so bw calc would split pipe.
 	 */
-	v->max_dppclk[0] = pixel_rate_khz / 1000;
+	if (pixel_rate_mhz < v->max_dppclk[0])
+		v->max_dppclk[0] = pixel_rate_mhz;
 }
 
 void hack_bounding_box(struct dcn_bw_internal_vars *v,
-- 
2.14.1