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drm/amd/display: Check for tg ops in dce110_set_avmute

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Some older DCE timing generators do not implement is_tg_enabled in
their ops table. Calling it unconditionally when waiting for AV mute
frames causes a NULL pointer dereference on Southern Islands dGPUs
when turning the display off over HDMI.

Check that tg and the required ops exist before waiting for frames.

Fixes: 414da24137 ("drm/amd/display: Add AV mute wait frames to dce110_set_avmute")
Closes: https://gitlab.freedesktop.org/drm/amd/-/work_items/5557
Tested-by: Viktor Jägersküpper <viktor_jaegerskuepper@freenet.de>
Signed-off-by: Ray Wu <ray.wu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Ray Wu 2026-08-05 09:47:17 +08:00 committed by Alex Deucher
parent 336e0cd576
commit 2686a0c0aa
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c
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@ -1349,7 +1349,10 @@ void dce110_set_avmute(struct pipe_ctx *pipe_ctx, bool enable)
* process the mute state, especially after link re-establishment
* with HDMI 2.0 scrambling enabled.
*/
if (enable && pipe_ctx->stream_res.tg->funcs->is_tg_enabled(pipe_ctx->stream_res.tg)) {
if (enable && pipe_ctx->stream_res.tg &&
pipe_ctx->stream_res.tg->funcs->is_tg_enabled &&
pipe_ctx->stream_res.tg->funcs->wait_for_state &&
pipe_ctx->stream_res.tg->funcs->is_tg_enabled(pipe_ctx->stream_res.tg)) {
int i;
pipe_ctx->stream_res.tg->funcs->wait_for_state(pipe_ctx->stream_res.tg, CRTC_STATE_VACTIVE);