| Message ID | 20240509053508.2807834-1-uma.shankar@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v4] drm/i915: Implement Audio WA_14020863754 | expand |
> -----Original Message----- > From: Shankar, Uma <uma.shankar@intel.com> > Sent: Thursday, May 9, 2024 11:05 AM > To: intel-gfx@lists.freedesktop.org; intel-xe@lists.freedesktop.org > Cc: Borah, Chaitanya Kumar <chaitanya.kumar.borah@intel.com>; > jani.nikula@linux.intel.com; Roper, Matthew D <matthew.d.roper@intel.com>; > Shankar, Uma <uma.shankar@intel.com> > Subject: [v4] drm/i915: Implement Audio WA_14020863754 > > WA_14020863754: Corner case with Min Hblank Fix can cause audio hang > > Issue: Previously a fix was made to avoid issues with extremely small hblanks, > called the "Min Hblank Fix". However, this can potentially cause an audio hang. > > Workaround : > During "Audio Programming Sequence" Audio Enabling - When DP mode is > enabled Set mmio offset 0x65F1C bit 18 = 1b, before step #1 "Enable audio > Presence Detect" > > During "Audio Programming Sequence" Audio Disabling - When DP mode is > enabled Clear mmio offset 0x65F1C bit 18 = 0b, after step #6 "Disable Audio PD > (Presence Detect)" > If not clearing PD bit, must also not clear 0x65F1C bit 18 (leave = 1b) > > v2: Update the platform checks (Jani Nikula) > > v3: Limited the WA to LNL and BMG, added a helper (Matt Roper) > > v4: Updated the bit naming, fixed redundant if statement Pushed to drm-intel-next. Thanks for the reviews. Regards, Uma Shankar > Signed-off-by: Uma Shankar <uma.shankar@intel.com> > Reviewed-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com> > --- > drivers/gpu/drm/i915/display/intel_audio.c | 15 +++++++++++++++ > drivers/gpu/drm/i915/display/intel_audio_regs.h | 3 +++ > 2 files changed, 18 insertions(+) > > diff --git a/drivers/gpu/drm/i915/display/intel_audio.c > b/drivers/gpu/drm/i915/display/intel_audio.c > index ed81e1466c4b..adde87900557 100644 > --- a/drivers/gpu/drm/i915/display/intel_audio.c > +++ b/drivers/gpu/drm/i915/display/intel_audio.c > @@ -183,6 +183,15 @@ static const struct hdmi_aud_ncts > hdmi_aud_ncts_36bpp[] = { > { 192000, TMDS_445_5M, 20480, 371250 }, }; > > +/* > + * WA_14020863754: Implement Audio Workaround > + * Corner case with Min Hblank Fix can cause audio hang */ static bool > +needs_wa_14020863754(struct drm_i915_private *i915) { > + return (DISPLAY_VER(i915) == 20 || IS_BATTLEMAGE(i915)); } > + > /* get AUD_CONFIG_PIXEL_CLOCK_HDMI_* value for mode */ static u32 > audio_config_hdmi_pixel_clock(const struct intel_crtc_state *crtc_state) { @@ - > 415,6 +424,9 @@ static void hsw_audio_codec_disable(struct intel_encoder > *encoder, > intel_de_rmw(i915, HSW_AUD_PIN_ELD_CP_VLD, > AUDIO_OUTPUT_ENABLE(cpu_transcoder), 0); > > + if (needs_wa_14020863754(i915)) > + intel_de_rmw(i915, AUD_CHICKENBIT_REG3, > DACBE_DISABLE_MIN_HBLANK_FIX, > +0); > + > mutex_unlock(&i915->display.audio.mutex); > } > > @@ -540,6 +552,9 @@ static void hsw_audio_codec_enable(struct > intel_encoder *encoder, > if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DP)) > enable_audio_dsc_wa(encoder, crtc_state); > > + if (needs_wa_14020863754(i915)) > + intel_de_rmw(i915, AUD_CHICKENBIT_REG3, 0, > +DACBE_DISABLE_MIN_HBLANK_FIX); > + > /* Enable audio presence detect */ > intel_de_rmw(i915, HSW_AUD_PIN_ELD_CP_VLD, > 0, AUDIO_OUTPUT_ENABLE(cpu_transcoder)); > diff --git a/drivers/gpu/drm/i915/display/intel_audio_regs.h > b/drivers/gpu/drm/i915/display/intel_audio_regs.h > index 88ea2740365d..4c31844d21df 100644 > --- a/drivers/gpu/drm/i915/display/intel_audio_regs.h > +++ b/drivers/gpu/drm/i915/display/intel_audio_regs.h > @@ -164,4 +164,7 @@ > > _VLV_AUD_PORT_EN_D_DBG) > #define VLV_AMP_MUTE (1 << 1) > > +#define AUD_CHICKENBIT_REG3 _MMIO(0x65F1C) > +#define DACBE_DISABLE_MIN_HBLANK_FIX REG_BIT(18) > + > #endif /* __INTEL_AUDIO_REGS_H__ */ > -- > 2.42.0
diff --git a/drivers/gpu/drm/i915/display/intel_audio.c b/drivers/gpu/drm/i915/display/intel_audio.c index ed81e1466c4b..adde87900557 100644 --- a/drivers/gpu/drm/i915/display/intel_audio.c +++ b/drivers/gpu/drm/i915/display/intel_audio.c @@ -183,6 +183,15 @@ static const struct hdmi_aud_ncts hdmi_aud_ncts_36bpp[] = { { 192000, TMDS_445_5M, 20480, 371250 }, }; +/* + * WA_14020863754: Implement Audio Workaround + * Corner case with Min Hblank Fix can cause audio hang + */ +static bool needs_wa_14020863754(struct drm_i915_private *i915) +{ + return (DISPLAY_VER(i915) == 20 || IS_BATTLEMAGE(i915)); +} + /* get AUD_CONFIG_PIXEL_CLOCK_HDMI_* value for mode */ static u32 audio_config_hdmi_pixel_clock(const struct intel_crtc_state *crtc_state) { @@ -415,6 +424,9 @@ static void hsw_audio_codec_disable(struct intel_encoder *encoder, intel_de_rmw(i915, HSW_AUD_PIN_ELD_CP_VLD, AUDIO_OUTPUT_ENABLE(cpu_transcoder), 0); + if (needs_wa_14020863754(i915)) + intel_de_rmw(i915, AUD_CHICKENBIT_REG3, DACBE_DISABLE_MIN_HBLANK_FIX, 0); + mutex_unlock(&i915->display.audio.mutex); } @@ -540,6 +552,9 @@ static void hsw_audio_codec_enable(struct intel_encoder *encoder, if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DP)) enable_audio_dsc_wa(encoder, crtc_state); + if (needs_wa_14020863754(i915)) + intel_de_rmw(i915, AUD_CHICKENBIT_REG3, 0, DACBE_DISABLE_MIN_HBLANK_FIX); + /* Enable audio presence detect */ intel_de_rmw(i915, HSW_AUD_PIN_ELD_CP_VLD, 0, AUDIO_OUTPUT_ENABLE(cpu_transcoder)); diff --git a/drivers/gpu/drm/i915/display/intel_audio_regs.h b/drivers/gpu/drm/i915/display/intel_audio_regs.h index 88ea2740365d..4c31844d21df 100644 --- a/drivers/gpu/drm/i915/display/intel_audio_regs.h +++ b/drivers/gpu/drm/i915/display/intel_audio_regs.h @@ -164,4 +164,7 @@ _VLV_AUD_PORT_EN_D_DBG) #define VLV_AMP_MUTE (1 << 1) +#define AUD_CHICKENBIT_REG3 _MMIO(0x65F1C) +#define DACBE_DISABLE_MIN_HBLANK_FIX REG_BIT(18) + #endif /* __INTEL_AUDIO_REGS_H__ */