[PATCH 11/16] drm/amd/display: fix zero value for APU watermark_c

Aurabindo Pillai aurabindo.pillai at amd.com
Wed Mar 19 17:55:16 UTC 2025


From: Charlene Liu <Charlene.Liu at amd.com>

[why]
the guard of is_apu not in sync, caused no watermark_c output.

Reviewed-by: Ovidiu Bunea <ovidiu.bunea at amd.com>
Signed-off-by: Charlene Liu <Charlene.Liu at amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai at amd.com>
---
 drivers/gpu/drm/amd/display/dc/dml2/dml2_wrapper.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dml2/dml2_wrapper.c b/drivers/gpu/drm/amd/display/dc/dml2/dml2_wrapper.c
index 939ee0708bd2..359a0337d617 100644
--- a/drivers/gpu/drm/amd/display/dc/dml2/dml2_wrapper.c
+++ b/drivers/gpu/drm/amd/display/dc/dml2/dml2_wrapper.c
@@ -661,7 +661,10 @@ static bool dml2_validate_and_build_resource(const struct dc *in_dc, struct dc_s
 		dml2_copy_clocks_to_dc_state(&out_clks, context);
 		dml2_extract_watermark_set(&context->bw_ctx.bw.dcn.watermarks.a, &dml2->v20.dml_core_ctx);
 		dml2_extract_watermark_set(&context->bw_ctx.bw.dcn.watermarks.b, &dml2->v20.dml_core_ctx);
-		memcpy(&context->bw_ctx.bw.dcn.watermarks.c, &dml2->v20.g6_temp_read_watermark_set, sizeof(context->bw_ctx.bw.dcn.watermarks.c));
+		if (context->streams[0]->sink->link->dc->caps.is_apu)
+			dml2_extract_watermark_set(&context->bw_ctx.bw.dcn.watermarks.c, &dml2->v20.dml_core_ctx);
+		else
+			memcpy(&context->bw_ctx.bw.dcn.watermarks.c, &dml2->v20.g6_temp_read_watermark_set, sizeof(context->bw_ctx.bw.dcn.watermarks.c));
 		dml2_extract_watermark_set(&context->bw_ctx.bw.dcn.watermarks.d, &dml2->v20.dml_core_ctx);
 		dml2_extract_writeback_wm(context, &dml2->v20.dml_core_ctx);
 		//copy for deciding zstate use
-- 
2.49.0



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