From: Alvin Lee <Alvin.Lee2@amd.com>
Date: Thu, 23 Oct 2025 19:26:33 +0000 (-0400)
Subject: drm/amd/display: Only initialize LSDMA if it is supported in DMU
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=edcace98fdfe20c485f33cfadabe78fce73cbe36;p=thirdparty%2Fkernel%2Flinux.git

drm/amd/display: Only initialize LSDMA if it is supported in DMU

Need to check caps flag to determine whether LSDMA is supported in DMU

Reviewed-by: Rafal Ostrowski <rafal.ostrowski@amd.com>
Signed-off-by: Alvin Lee <Alvin.Lee2@amd.com>
Signed-off-by: Fangzhi Zuo <jerry.zuo@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
index fffbf1983143d..7b09af1cb306e 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
+++ b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
@@ -2084,6 +2084,9 @@ bool dmub_lsdma_init(struct dc_dmub_srv *dc_dmub_srv)
 	struct dmub_cmd_lsdma_data *lsdma_data = &cmd.lsdma.lsdma_data;
 	bool result;
 
+	if (!dc_dmub_srv->dmub->feature_caps.lsdma_support_in_dmu)
+		return false;
+
 	memset(&cmd, 0, sizeof(cmd));
 
 	cmd.cmd_common.header.type     = DMUB_CMD__LSDMA;
diff --git a/drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h b/drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h
index 9bc512a522e03..e956722209baf 100644
--- a/drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h
+++ b/drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h
@@ -721,6 +721,7 @@ struct dmub_feature_caps {
 	uint8_t replay_supported;
 	uint8_t replay_reserved[3];
 	uint8_t abm_aux_backlight_support;
+	uint8_t lsdma_support_in_dmu;
 };
 
 struct dmub_visual_confirm_color {