[PATCH 17/17] drm/amd/display: DCN2.x Do not program DPPCLK if same value

[Rodrigo Siqueira]

From: Sung Lee <sung.lee at amd.com>

[WHY]
Programming DPPCLK to the same value currently set may cause
underflow while playing video in certain conditions.

[HOW]
Only program DPPCLK if clock is not the same as the
previous value programmed.

Signed-off-by: Sung Lee <sung.lee at amd.com>
Reviewed-by: Yongqiang Sun <yongqiang.sun at amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira at amd.com>
---
 drivers/gpu/drm/amd/display/dc/clk_mgr/dcn20/dcn20_clk_mgr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn20/dcn20_clk_mgr.c b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn20/dcn20_clk_mgr.c
index 495f01e9f2ca..49ce46b543ea 100644
--- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn20/dcn20_clk_mgr.c
+++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn20/dcn20_clk_mgr.c
@@ -117,7 +117,7 @@ void dcn20_update_clocks_update_dpp_dto(struct clk_mgr_internal *clk_mgr,
 
 		prev_dppclk_khz = clk_mgr->base.ctx->dc->current_state->res_ctx.pipe_ctx[i].plane_res.bw.dppclk_khz;
 
-		if (safe_to_lower || prev_dppclk_khz < dppclk_khz) {
+		if ((prev_dppclk_khz > dppclk_khz && safe_to_lower) || prev_dppclk_khz < dppclk_khz) {
 			clk_mgr->dccg->funcs->update_dpp_dto(
 							clk_mgr->dccg, dpp_inst, dppclk_khz);
 		}
-- 
2.25.0