[PATCH 6.18 140/752] drm/amd/display: Add signal type check for dcn401 get_phyd32clk_src

Sasha Levin
2026-02-28T17:50:06Z

From: Dmytro Laktyushkin <dmytro.laktyushkin@amd.com>

[ Upstream commit c979d8db7b0f293111f2e83795ea353c8ed75de9 ]

Trying to access link enc on a dpia link will cause a crash otherwise

Reviewed-by: Charlene Liu <charlene.liu@amd.com>
Signed-off-by: Dmytro Laktyushkin <dmytro.laktyushkin@amd.com>
Signed-off-by: Chenyu Chen <chen-yu.chen@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c b/drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c
index bbfefc9edd1f1..483217a91029a 100644
--- a/drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c
@@ -914,10 +914,10 @@ static void dcn401_enable_stream_calc(
pipe_ctx->stream->link->cur_link_settings.lane_count;
uint32_t active_total_with_borders;

- if (dc->link_srv->dp_is_128b_132b_signal(pipe_ctx))
+ if (dc->link_srv->dp_is_128b_132b_signal(pipe_ctx)) {
*dp_hpo_inst = pipe_ctx->stream_res.hpo_dp_stream_enc->inst;
-
- *phyd32clk = get_phyd32clk_src(pipe_ctx->stream->link);
+ *phyd32clk = get_phyd32clk_src(pipe_ctx->stream->link);
+ }

if (dc_is_tmds_signal(pipe_ctx->stream->signal))
dcn401_calculate_dccg_tmds_div_value(pipe_ctx, tmds_div);
--
2.51.0