From: Ville Syrjälä <[email protected]> On the "ilk" platforms AUD_CNTL_ST2 is a singleton. Protect it with the audio mutex in case we ever want to do parallel RMW access to it.
Currently that should not happen since we only do audio enable/disable from full modesets, and those are fully serialized. But we probably want to think about toggling audio on/off from fastsets too. The hsw codepaths alreayd already have the same locking. g4x should not need it since it can only do audio to a single port at a time, which means it's actually broken in more ways than this atm. Cc: Chaitanya Kumar Borah <[email protected]> Cc: Kai Vehmanen <[email protected]> Cc: Takashi Iwai <[email protected]> Signed-off-by: Ville Syrjälä <[email protected]> --- drivers/gpu/drm/i915/display/intel_audio.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_audio.c b/drivers/gpu/drm/i915/display/intel_audio.c index c6f0c8be82b2..9a286d70e281 100644 --- a/drivers/gpu/drm/i915/display/intel_audio.c +++ b/drivers/gpu/drm/i915/display/intel_audio.c @@ -707,6 +707,8 @@ static void ilk_audio_codec_disable(struct intel_encoder *encoder, ilk_audio_regs_init(i915, pipe, ®s); + mutex_lock(&i915->display.audio.mutex); + /* Disable timestamps */ tmp = intel_de_read(i915, regs.aud_config); tmp &= ~AUD_CONFIG_N_VALUE_INDEX; @@ -721,6 +723,8 @@ static void ilk_audio_codec_disable(struct intel_encoder *encoder, tmp = intel_de_read(i915, regs.aud_cntrl_st2); tmp &= ~IBX_ELD_VALID(port); intel_de_write(i915, regs.aud_cntrl_st2, tmp); + + mutex_unlock(&i915->display.audio.mutex); } static void ilk_audio_codec_enable(struct intel_encoder *encoder, @@ -749,6 +753,7 @@ static void ilk_audio_codec_enable(struct intel_encoder *encoder, ilk_audio_regs_init(i915, pipe, ®s); + mutex_lock(&i915->display.audio.mutex); /* Invalidate ELD */ tmp = intel_de_read(i915, regs.aud_cntrl_st2); @@ -781,6 +786,8 @@ static void ilk_audio_codec_enable(struct intel_encoder *encoder, else tmp |= audio_config_hdmi_pixel_clock(crtc_state); intel_de_write(i915, regs.aud_config, tmp); + + mutex_unlock(&i915->display.audio.mutex); } /** -- 2.35.1
