From: renpanpan The amdgpu legacy DCE audio path (dce_v6/v8/v10) unconditionally calls audio_enable(pin, true) at the end of afmt_setmode(), regardless of whether the connected display advertises audio support in its EDID. This causes a phantom HDMI audio output to appear for displays that have no audio capability (no basic audio bit, no Audio Data Block in EDID), because the GPU sets the AUDIO_ENABLED register bit, which drives the HDA codec's ELDV pin sense, making the codec report the jack as audio-available. The radeon, nouveau, and dw-hdmi drivers all gate audio enablement on the display's audio capability. Apply the same check to amdgpu's DCE afmt_setmode functions, while still respecting the AMDGPU_AUDIO_ENABLE override for users who explicitly force audio on. Fixes: e2cdf640cbb5 ("drm/amdgpu: add display controller implementation for si v10") Cc: stable@vger.kernel.org Signed-off-by: renpanpan --- Changes in v2: - Respect AMDGPU_AUDIO_ENABLE override for users who force audio on - Add Fixes tag and Cc: stable@vger.kernel.org for stable backport drivers/gpu/drm/amd/amdgpu/dce_v10_0.c | 6 ++++-- drivers/gpu/drm/amd/amdgpu/dce_v6_0.c | 6 ++++-- drivers/gpu/drm/amd/amdgpu/dce_v8_0.c | 6 ++++-- 3 files changed, 12 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c index f2977fe6d824..69d0c6041d75 100644 --- a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c +++ b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c @@ -1705,8 +1705,10 @@ static void dce_v10_0_afmt_setmode(struct drm_encoder *encoder, WREG32(mmAFMT_RAMP_CONTROL2 + dig->afmt->offset, 0x00000001); WREG32(mmAFMT_RAMP_CONTROL3 + dig->afmt->offset, 0x00000001); - /* enable audio after to setting up hw */ - dce_v10_0_audio_enable(adev, dig->afmt->pin, true); + /* Only enable audio if the display supports it or is forced on */ + if (connector->display_info.has_audio || + to_amdgpu_connector(connector)->audio == AMDGPU_AUDIO_ENABLE) + dce_v10_0_audio_enable(adev, dig->afmt->pin, true); } static void dce_v10_0_afmt_enable(struct drm_encoder *encoder, bool enable) diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c index c68de0fe1d7d..226cfce321ec 100644 --- a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c +++ b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c @@ -1748,8 +1748,10 @@ static void dce_v6_0_afmt_setmode(struct drm_encoder *encoder, dce_v6_0_audio_dp_enable(encoder, 1); } - /* enable audio after setting up hw */ - dce_v6_0_audio_enable(adev, dig->afmt->pin, true); + /* Only enable audio if the display supports it or is forced on */ + if (connector->display_info.has_audio || + amdgpu_connector->audio == AMDGPU_AUDIO_ENABLE) + dce_v6_0_audio_enable(adev, dig->afmt->pin, true); } static void dce_v6_0_afmt_enable(struct drm_encoder *encoder, bool enable) diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c index c3906270f25e..99f0c5759d75 100644 --- a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c +++ b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c @@ -1653,8 +1653,10 @@ static void dce_v8_0_afmt_setmode(struct drm_encoder *encoder, WREG32(mmAFMT_RAMP_CONTROL2 + offset, 0x00000001); WREG32(mmAFMT_RAMP_CONTROL3 + offset, 0x00000001); - /* enable audio after setting up hw */ - dce_v8_0_audio_enable(adev, dig->afmt->pin, true); + /* Only enable audio if the display supports it or is forced on */ + if (connector->display_info.has_audio || + to_amdgpu_connector(connector)->audio == AMDGPU_AUDIO_ENABLE) + dce_v8_0_audio_enable(adev, dig->afmt->pin, true); } static void dce_v8_0_afmt_enable(struct drm_encoder *encoder, bool enable) -- 2.43.0