| Message ID | 20200407161857.20408-1-uma.shankar@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v4] drm/i915/display: Enable DP Display Audio WA | expand |
On 2020-04-07 at 21:48:57 +0530, Uma Shankar wrote: > For certain DP VDSC bpp settings, hblank asserts before hblank_early, > leading to a bad audio state. Driver need to program "hblank early > enable" and "samples per line" parameters in AUDIO_CONFIG_BE > register. > > This is Display Audio WA #1406928334 for 4k+VDSC usecase > applicable on DP encoders. Implemented the same. > > v2: Fixed build failures on 32bit machine. > > v3: Dropped u64, added helpers for sample room calculation, > other general comments as per Jani Nikula's feedback. > Also fixed connector type check (spotted by Anshuman) > > v4: Addressed Jani Nikula and Kai's review comments. There are some minor comment below. > > Signed-off-by: Uma Shankar <uma.shankar@intel.com> > --- > drivers/gpu/drm/i915/display/intel_audio.c | 147 +++++++++++++++++++++ > drivers/gpu/drm/i915/i915_reg.h | 16 +++ > 2 files changed, 163 insertions(+) > > diff --git a/drivers/gpu/drm/i915/display/intel_audio.c b/drivers/gpu/drm/i915/display/intel_audio.c > index 950160f1a89f..87118cb4a3ae 100644 > --- a/drivers/gpu/drm/i915/display/intel_audio.c > +++ b/drivers/gpu/drm/i915/display/intel_audio.c > @@ -512,6 +512,149 @@ static void hsw_audio_codec_disable(struct intel_encoder *encoder, > mutex_unlock(&dev_priv->av_mutex); > } > > +/* Add a factor to take care of rounding and truncations */ > +#define ROUNDING_FACTOR 10000 > + > +static unsigned int get_hblank_early_enable_config(struct intel_encoder *encoder, > + const struct intel_crtc_state *crtc_state) > +{ > + struct drm_i915_private *i915 = to_i915(encoder->base.dev); > + unsigned int link_clks_available, link_clks_required; > + unsigned int tu_data, tu_line, link_clks_active; > + unsigned int hblank_rise, hblank_early_prog; > + unsigned int h_active, h_total, hblank_delta, pixel_clk, v_total; > + unsigned int fec_coeff, refresh_rate, cdclk; > + > + h_active = crtc_state->hw.adjusted_mode.hdisplay; > + h_total = crtc_state->hw.adjusted_mode.htotal; > + v_total = crtc_state->hw.adjusted_mode.vtotal; IMO we should adjusted_mode.crtc_x param for any crtc timing realted math , as crtc_x params are actual hw params. please correct me if i am wrong. > + hblank_rise = crtc_state->hw.adjusted_mode.hsync_start; IMO we don't need to intilize this with hsync_start. > + pixel_clk = crtc_state->hw.adjusted_mode.clock; > + refresh_rate = crtc_state->hw.adjusted_mode.vrefresh; > + cdclk = i915->cdclk.hw.cdclk; > + /* fec= 0.972261, using rounding multiplier of 1000000 */ > + fec_coeff = 972261; > + > + drm_dbg_kms(&i915->drm, "h_active = %u link_clk = %u :" > + "lanes = %u vdsc_bpp = %u cdclk = %u\n", B.Specs says "If not using compression, vdsc_bpp = input_bpp", if i am correct is it vdsc comression ? and we program hblank_early when dsc comression is enabled, so from this logic vdsc_bpp != pipe_bpp ? > + h_active, crtc_state->port_clock, crtc_state->lane_count, > + crtc_state->pipe_bpp, cdclk); > + > + link_clks_available = ((((h_total - h_active) * > + ((crtc_state->port_clock * ROUNDING_FACTOR) / > + pixel_clk)) / ROUNDING_FACTOR) - 28); > + > + link_clks_required = DIV_ROUND_UP(192000, (refresh_rate * > + v_total)) * ((48 / > + crtc_state->lane_count) + 2); > + > + if (link_clks_available > link_clks_required) > + hblank_delta = 32; > + else > + hblank_delta = DIV_ROUND_UP(((((5 * ROUNDING_FACTOR) / > + crtc_state->port_clock) + ((5 * > + ROUNDING_FACTOR) / > + cdclk)) * pixel_clk), > + ROUNDING_FACTOR); > + > + tu_data = (pixel_clk * crtc_state->pipe_bpp * 8) / > + ((crtc_state->port_clock * > + crtc_state->lane_count * fec_coeff) / 1000000); > + tu_line = (((h_active * crtc_state->port_clock * fec_coeff) / > + 1000000) / (64 * pixel_clk)); > + link_clks_active = (tu_line - 1) * 64 + tu_data; > + > + hblank_rise = ((link_clks_active + 6 * DIV_ROUND_UP(link_clks_active, > + 250) + 4) * ((pixel_clk * ROUNDING_FACTOR) / > + crtc_state->port_clock)) / ROUNDING_FACTOR; > + > + hblank_early_prog = h_active - hblank_rise + hblank_delta; > + > + return hblank_early_prog; > +} > + > +static unsigned int get_sample_room_req_config(const struct intel_crtc_state *crtc_state) > +{ > + unsigned int h_active, h_total, pixel_clk; > + unsigned int samples_room; > + > + h_active = crtc_state->hw.adjusted_mode.hdisplay; > + h_total = crtc_state->hw.adjusted_mode.htotal; > + pixel_clk = crtc_state->hw.adjusted_mode.clock; > + > + samples_room = ((((h_total - h_active) * ((crtc_state->port_clock * > + ROUNDING_FACTOR) / pixel_clk)) / > + ROUNDING_FACTOR) - 12) / ((48 / > + crtc_state->lane_count) + 2); > + > + return samples_room; > +} > + > +static void enable_audio_dsc_wa(struct intel_encoder *encoder, > + const struct intel_crtc_state *crtc_state) > +{ > + struct drm_i915_private *i915 = to_i915(encoder->base.dev); > + struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc); > + enum pipe pipe = crtc->pipe; > + unsigned int hblank_early_prog, samples_room, h_active; > + unsigned int val; > + > + if (INTEL_GEN(i915) < 11) > + return; > + > + h_active = crtc_state->hw.adjusted_mode.hdisplay; > + > + if (!(h_active && crtc_state->port_clock && crtc_state->lane_count && > + crtc_state->pipe_bpp && i915->cdclk.hw.cdclk)) { > + drm_err(&i915->drm, "Null Params rcvd for hblank early enabling\n"); > + WARN_ON(1); > + return; > + } > + > + val = intel_de_read(i915, AUD_CONFIG_BE); > + > + if (INTEL_GEN(i915) == 11) > + val |= HBLANK_EARLY_ENABLE_ICL(pipe); > + else if (INTEL_GEN(i915) >= 12) > + val |= HBLANK_EARLY_ENABLE_TGL(pipe); > + > + if (crtc_state->dsc.compression_enable && > + (crtc_state->hw.adjusted_mode.hdisplay >= 3840 && > + crtc_state->hw.adjusted_mode.vdisplay >= 2160)) { > + /* Get hblank early enable value required */ > + hblank_early_prog = get_hblank_early_enable_config(encoder, > + crtc_state); > + if (hblank_early_prog < 32) { > + val &= ~HBLANK_START_COUNT_MASK(pipe); > + val |= HBLANK_START_COUNT(pipe, HBLANK_START_COUNT_32); > + } else if (hblank_early_prog < 64) { > + val &= ~HBLANK_START_COUNT_MASK(pipe); > + val |= HBLANK_START_COUNT(pipe, HBLANK_START_COUNT_64); > + } else if (hblank_early_prog < 96) { > + val &= ~HBLANK_START_COUNT_MASK(pipe); > + val |= HBLANK_START_COUNT(pipe, HBLANK_START_COUNT_96); > + } else { > + val &= ~HBLANK_START_COUNT_MASK(pipe); > + val |= HBLANK_START_COUNT(pipe, HBLANK_START_COUNT_128); > + } > + > + /* Get samples room value required */ > + samples_room = get_sample_room_req_config(crtc_state); > + if (samples_room < 3) { > + val &= ~NUMBER_SAMPLES_PER_LINE_MASK(pipe); > + val |= NUMBER_SAMPLES_PER_LINE(pipe, samples_room); > + } else { > + /* Program 0 i.e "All Samples available in buffer" */ > + val &= ~NUMBER_SAMPLES_PER_LINE_MASK(pipe); > + val |= NUMBER_SAMPLES_PER_LINE(pipe, 0x0); > + } > + } > + > + intel_de_write(i915, AUD_CONFIG_BE, val); > +} > + > +#undef ROUNDING_FACTOR > + > static void hsw_audio_codec_enable(struct intel_encoder *encoder, > const struct intel_crtc_state *crtc_state, > const struct drm_connector_state *conn_state) > @@ -529,6 +672,10 @@ static void hsw_audio_codec_enable(struct intel_encoder *encoder, > > mutex_lock(&dev_priv->av_mutex); > > + /* Enable Audio WA for 4k DSC usecases */ > + if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DP)) > + enable_audio_dsc_wa(encoder, crtc_state); > + > /* Enable audio presence detect, invalidate ELD */ > tmp = intel_de_read(dev_priv, HSW_AUD_PIN_ELD_CP_VLD); > tmp |= AUDIO_OUTPUT_ENABLE(cpu_transcoder); > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h > index 8cebb7a86b8c..f72ea2c2a8e3 100644 > --- a/drivers/gpu/drm/i915/i915_reg.h > +++ b/drivers/gpu/drm/i915/i915_reg.h > @@ -9395,6 +9395,22 @@ enum { > #define AUD_PIN_BUF_CTL _MMIO(0x48414) > #define AUD_PIN_BUF_ENABLE REG_BIT(31) > > +/* Display Audio Config Reg */ > +#define AUD_CONFIG_BE _MMIO(0x65ef0) > +#define HBLANK_EARLY_ENABLE_ICL(pipe) (0x1 << (20 - (pipe))) > +#define HBLANK_EARLY_ENABLE_TGL(pipe) (0x1 << (24 + (pipe))) > +#define HBLANK_START_COUNT_MASK(pipe) (0x7 << (3 + ((pipe) * 6))) > +#define HBLANK_START_COUNT(pipe, val) (((val) & 0x7) << (3 + ((pipe)) * 6)) > +#define NUMBER_SAMPLES_PER_LINE_MASK(pipe) (0x3 << ((pipe) * 6)) > +#define NUMBER_SAMPLES_PER_LINE(pipe, val) (((val) & 0x3) << ((pipe) * 6)) Earlier Nikula Jani has provided suggestion to use REG_FIELD_PREP. Thanks , Anshuman Gupta. > + > +#define HBLANK_START_COUNT_8 0 > +#define HBLANK_START_COUNT_16 1 > +#define HBLANK_START_COUNT_32 2 > +#define HBLANK_START_COUNT_64 3 > +#define HBLANK_START_COUNT_96 4 > +#define HBLANK_START_COUNT_128 5 > + > /* > * HSW - ICL power wells > * > -- > 2.22.0 >
> -----Original Message----- > From: Gupta, Anshuman <anshuman.gupta@intel.com> > Sent: Tuesday, April 14, 2020 7:47 PM > To: Shankar, Uma <uma.shankar@intel.com> > Cc: intel-gfx@lists.freedesktop.org; Vehmanen, Kai <kai.vehmanen@intel.com>; > jani.nikula@linux.intel.com > Subject: Re: [PATCH v4] drm/i915/display: Enable DP Display Audio WA > > On 2020-04-07 at 21:48:57 +0530, Uma Shankar wrote: > > For certain DP VDSC bpp settings, hblank asserts before hblank_early, > > leading to a bad audio state. Driver need to program "hblank early > > enable" and "samples per line" parameters in AUDIO_CONFIG_BE register. > > > > This is Display Audio WA #1406928334 for 4k+VDSC usecase applicable on > > DP encoders. Implemented the same. > > > > v2: Fixed build failures on 32bit machine. > > > > v3: Dropped u64, added helpers for sample room calculation, > > other general comments as per Jani Nikula's feedback. > > Also fixed connector type check (spotted by Anshuman) > > > > v4: Addressed Jani Nikula and Kai's review comments. > There are some minor comment below. > > > > Signed-off-by: Uma Shankar <uma.shankar@intel.com> > > --- > > drivers/gpu/drm/i915/display/intel_audio.c | 147 +++++++++++++++++++++ > > drivers/gpu/drm/i915/i915_reg.h | 16 +++ > > 2 files changed, 163 insertions(+) > > > > diff --git a/drivers/gpu/drm/i915/display/intel_audio.c > > b/drivers/gpu/drm/i915/display/intel_audio.c > > index 950160f1a89f..87118cb4a3ae 100644 > > --- a/drivers/gpu/drm/i915/display/intel_audio.c > > +++ b/drivers/gpu/drm/i915/display/intel_audio.c > > @@ -512,6 +512,149 @@ static void hsw_audio_codec_disable(struct > intel_encoder *encoder, > > mutex_unlock(&dev_priv->av_mutex); > > } > > > > +/* Add a factor to take care of rounding and truncations */ #define > > +ROUNDING_FACTOR 10000 > > + > > +static unsigned int get_hblank_early_enable_config(struct intel_encoder > *encoder, > > + const struct intel_crtc_state > *crtc_state) { > > + struct drm_i915_private *i915 = to_i915(encoder->base.dev); > > + unsigned int link_clks_available, link_clks_required; > > + unsigned int tu_data, tu_line, link_clks_active; > > + unsigned int hblank_rise, hblank_early_prog; > > + unsigned int h_active, h_total, hblank_delta, pixel_clk, v_total; > > + unsigned int fec_coeff, refresh_rate, cdclk; > > + > > + h_active = crtc_state->hw.adjusted_mode.hdisplay; > > + h_total = crtc_state->hw.adjusted_mode.htotal; > > + v_total = crtc_state->hw.adjusted_mode.vtotal; > IMO we should adjusted_mode.crtc_x param for any crtc timing > realted math , as crtc_x params are actual hw params. > please correct me if i am wrong. Yeah ok, I will update these to crtc_* > > + hblank_rise = crtc_state->hw.adjusted_mode.hsync_start; > IMO we don't need to intilize this with hsync_start. > > + pixel_clk = crtc_state->hw.adjusted_mode.clock; > > + refresh_rate = crtc_state->hw.adjusted_mode.vrefresh; > > + cdclk = i915->cdclk.hw.cdclk; > > + /* fec= 0.972261, using rounding multiplier of 1000000 */ > > + fec_coeff = 972261; > > + > > + drm_dbg_kms(&i915->drm, "h_active = %u link_clk = %u :" > > + "lanes = %u vdsc_bpp = %u cdclk = %u\n", > B.Specs says "If not using compression, vdsc_bpp = input_bpp", > if i am correct is it vdsc comression ? > and we program hblank_early when dsc comression is enabled, > so from this logic vdsc_bpp != pipe_bpp ? > > + h_active, crtc_state->port_clock, crtc_state->lane_count, > > + crtc_state->pipe_bpp, cdclk); > > + > > + link_clks_available = ((((h_total - h_active) * > > + ((crtc_state->port_clock * ROUNDING_FACTOR) / > > + pixel_clk)) / ROUNDING_FACTOR) - 28); > > + > > + link_clks_required = DIV_ROUND_UP(192000, (refresh_rate * > > + v_total)) * ((48 / > > + crtc_state->lane_count) + 2); > > + > > + if (link_clks_available > link_clks_required) > > + hblank_delta = 32; > > + else > > + hblank_delta = DIV_ROUND_UP(((((5 * ROUNDING_FACTOR) / > > + crtc_state->port_clock) + ((5 * > > + ROUNDING_FACTOR) / > > + cdclk)) * pixel_clk), > > + ROUNDING_FACTOR); > > + > > + tu_data = (pixel_clk * crtc_state->pipe_bpp * 8) / > > + ((crtc_state->port_clock * > > + crtc_state->lane_count * fec_coeff) / 1000000); > > + tu_line = (((h_active * crtc_state->port_clock * fec_coeff) / > > + 1000000) / (64 * pixel_clk)); > > + link_clks_active = (tu_line - 1) * 64 + tu_data; > > + > > + hblank_rise = ((link_clks_active + 6 * DIV_ROUND_UP(link_clks_active, > > + 250) + 4) * ((pixel_clk * ROUNDING_FACTOR) / > > + crtc_state->port_clock)) / ROUNDING_FACTOR; > > + > > + hblank_early_prog = h_active - hblank_rise + hblank_delta; > > + > > + return hblank_early_prog; > > +} > > + > > +static unsigned int get_sample_room_req_config(const struct > > +intel_crtc_state *crtc_state) { > > + unsigned int h_active, h_total, pixel_clk; > > + unsigned int samples_room; > > + > > + h_active = crtc_state->hw.adjusted_mode.hdisplay; > > + h_total = crtc_state->hw.adjusted_mode.htotal; > > + pixel_clk = crtc_state->hw.adjusted_mode.clock; > > + > > + samples_room = ((((h_total - h_active) * ((crtc_state->port_clock * > > + ROUNDING_FACTOR) / pixel_clk)) / > > + ROUNDING_FACTOR) - 12) / ((48 / > > + crtc_state->lane_count) + 2); > > + > > + return samples_room; > > +} > > + > > +static void enable_audio_dsc_wa(struct intel_encoder *encoder, > > + const struct intel_crtc_state *crtc_state) { > > + struct drm_i915_private *i915 = to_i915(encoder->base.dev); > > + struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc); > > + enum pipe pipe = crtc->pipe; > > + unsigned int hblank_early_prog, samples_room, h_active; > > + unsigned int val; > > + > > + if (INTEL_GEN(i915) < 11) > > + return; > > + > > + h_active = crtc_state->hw.adjusted_mode.hdisplay; > > + > > + if (!(h_active && crtc_state->port_clock && crtc_state->lane_count && > > + crtc_state->pipe_bpp && i915->cdclk.hw.cdclk)) { > > + drm_err(&i915->drm, "Null Params rcvd for hblank early > enabling\n"); > > + WARN_ON(1); > > + return; > > + } > > + > > + val = intel_de_read(i915, AUD_CONFIG_BE); > > + > > + if (INTEL_GEN(i915) == 11) > > + val |= HBLANK_EARLY_ENABLE_ICL(pipe); > > + else if (INTEL_GEN(i915) >= 12) > > + val |= HBLANK_EARLY_ENABLE_TGL(pipe); > > + > > + if (crtc_state->dsc.compression_enable && > > + (crtc_state->hw.adjusted_mode.hdisplay >= 3840 && > > + crtc_state->hw.adjusted_mode.vdisplay >= 2160)) { > > + /* Get hblank early enable value required */ > > + hblank_early_prog = get_hblank_early_enable_config(encoder, > > + crtc_state); > > + if (hblank_early_prog < 32) { > > + val &= ~HBLANK_START_COUNT_MASK(pipe); > > + val |= HBLANK_START_COUNT(pipe, > HBLANK_START_COUNT_32); > > + } else if (hblank_early_prog < 64) { > > + val &= ~HBLANK_START_COUNT_MASK(pipe); > > + val |= HBLANK_START_COUNT(pipe, > HBLANK_START_COUNT_64); > > + } else if (hblank_early_prog < 96) { > > + val &= ~HBLANK_START_COUNT_MASK(pipe); > > + val |= HBLANK_START_COUNT(pipe, > HBLANK_START_COUNT_96); > > + } else { > > + val &= ~HBLANK_START_COUNT_MASK(pipe); > > + val |= HBLANK_START_COUNT(pipe, > HBLANK_START_COUNT_128); > > + } > > + > > + /* Get samples room value required */ > > + samples_room = get_sample_room_req_config(crtc_state); > > + if (samples_room < 3) { > > + val &= ~NUMBER_SAMPLES_PER_LINE_MASK(pipe); > > + val |= NUMBER_SAMPLES_PER_LINE(pipe, samples_room); > > + } else { > > + /* Program 0 i.e "All Samples available in buffer" */ > > + val &= ~NUMBER_SAMPLES_PER_LINE_MASK(pipe); > > + val |= NUMBER_SAMPLES_PER_LINE(pipe, 0x0); > > + } > > + } > > + > > + intel_de_write(i915, AUD_CONFIG_BE, val); } > > + > > +#undef ROUNDING_FACTOR > > + > > static void hsw_audio_codec_enable(struct intel_encoder *encoder, > > const struct intel_crtc_state *crtc_state, > > const struct drm_connector_state *conn_state) > @@ -529,6 > > +672,10 @@ static void hsw_audio_codec_enable(struct intel_encoder > > *encoder, > > > > mutex_lock(&dev_priv->av_mutex); > > > > + /* Enable Audio WA for 4k DSC usecases */ > > + if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DP)) > > + enable_audio_dsc_wa(encoder, crtc_state); > > + > > /* Enable audio presence detect, invalidate ELD */ > > tmp = intel_de_read(dev_priv, HSW_AUD_PIN_ELD_CP_VLD); > > tmp |= AUDIO_OUTPUT_ENABLE(cpu_transcoder); > > diff --git a/drivers/gpu/drm/i915/i915_reg.h > > b/drivers/gpu/drm/i915/i915_reg.h index 8cebb7a86b8c..f72ea2c2a8e3 > > 100644 > > --- a/drivers/gpu/drm/i915/i915_reg.h > > +++ b/drivers/gpu/drm/i915/i915_reg.h > > @@ -9395,6 +9395,22 @@ enum { > > #define AUD_PIN_BUF_CTL _MMIO(0x48414) > > #define AUD_PIN_BUF_ENABLE REG_BIT(31) > > > > +/* Display Audio Config Reg */ > > +#define AUD_CONFIG_BE _MMIO(0x65ef0) > > +#define HBLANK_EARLY_ENABLE_ICL(pipe) (0x1 << (20 - (pipe))) > > +#define HBLANK_EARLY_ENABLE_TGL(pipe) (0x1 << (24 + (pipe))) > > +#define HBLANK_START_COUNT_MASK(pipe) (0x7 << (3 + ((pipe) * 6))) > > +#define HBLANK_START_COUNT(pipe, val) (((val) & 0x7) << (3 + > ((pipe)) * 6)) > > +#define NUMBER_SAMPLES_PER_LINE_MASK(pipe) (0x3 << ((pipe) * 6)) > > +#define NUMBER_SAMPLES_PER_LINE(pipe, val) (((val) & 0x3) << ((pipe) * > 6)) > Earlier Nikula Jani has provided suggestion to use REG_FIELD_PREP. MASK itself is dependent on pipe, so I feel it is simpler like this. > Thanks , > Anshuman Gupta. > > + > > +#define HBLANK_START_COUNT_8 0 > > +#define HBLANK_START_COUNT_16 1 > > +#define HBLANK_START_COUNT_32 2 > > +#define HBLANK_START_COUNT_64 3 > > +#define HBLANK_START_COUNT_96 4 > > +#define HBLANK_START_COUNT_128 5 > > + > > /* > > * HSW - ICL power wells > > * > > -- > > 2.22.0 > >
diff --git a/drivers/gpu/drm/i915/display/intel_audio.c b/drivers/gpu/drm/i915/display/intel_audio.c index 950160f1a89f..87118cb4a3ae 100644 --- a/drivers/gpu/drm/i915/display/intel_audio.c +++ b/drivers/gpu/drm/i915/display/intel_audio.c @@ -512,6 +512,149 @@ static void hsw_audio_codec_disable(struct intel_encoder *encoder, mutex_unlock(&dev_priv->av_mutex); } +/* Add a factor to take care of rounding and truncations */ +#define ROUNDING_FACTOR 10000 + +static unsigned int get_hblank_early_enable_config(struct intel_encoder *encoder, + const struct intel_crtc_state *crtc_state) +{ + struct drm_i915_private *i915 = to_i915(encoder->base.dev); + unsigned int link_clks_available, link_clks_required; + unsigned int tu_data, tu_line, link_clks_active; + unsigned int hblank_rise, hblank_early_prog; + unsigned int h_active, h_total, hblank_delta, pixel_clk, v_total; + unsigned int fec_coeff, refresh_rate, cdclk; + + h_active = crtc_state->hw.adjusted_mode.hdisplay; + h_total = crtc_state->hw.adjusted_mode.htotal; + v_total = crtc_state->hw.adjusted_mode.vtotal; + hblank_rise = crtc_state->hw.adjusted_mode.hsync_start; + pixel_clk = crtc_state->hw.adjusted_mode.clock; + refresh_rate = crtc_state->hw.adjusted_mode.vrefresh; + cdclk = i915->cdclk.hw.cdclk; + /* fec= 0.972261, using rounding multiplier of 1000000 */ + fec_coeff = 972261; + + drm_dbg_kms(&i915->drm, "h_active = %u link_clk = %u :" + "lanes = %u vdsc_bpp = %u cdclk = %u\n", + h_active, crtc_state->port_clock, crtc_state->lane_count, + crtc_state->pipe_bpp, cdclk); + + link_clks_available = ((((h_total - h_active) * + ((crtc_state->port_clock * ROUNDING_FACTOR) / + pixel_clk)) / ROUNDING_FACTOR) - 28); + + link_clks_required = DIV_ROUND_UP(192000, (refresh_rate * + v_total)) * ((48 / + crtc_state->lane_count) + 2); + + if (link_clks_available > link_clks_required) + hblank_delta = 32; + else + hblank_delta = DIV_ROUND_UP(((((5 * ROUNDING_FACTOR) / + crtc_state->port_clock) + ((5 * + ROUNDING_FACTOR) / + cdclk)) * pixel_clk), + ROUNDING_FACTOR); + + tu_data = (pixel_clk * crtc_state->pipe_bpp * 8) / + ((crtc_state->port_clock * + crtc_state->lane_count * fec_coeff) / 1000000); + tu_line = (((h_active * crtc_state->port_clock * fec_coeff) / + 1000000) / (64 * pixel_clk)); + link_clks_active = (tu_line - 1) * 64 + tu_data; + + hblank_rise = ((link_clks_active + 6 * DIV_ROUND_UP(link_clks_active, + 250) + 4) * ((pixel_clk * ROUNDING_FACTOR) / + crtc_state->port_clock)) / ROUNDING_FACTOR; + + hblank_early_prog = h_active - hblank_rise + hblank_delta; + + return hblank_early_prog; +} + +static unsigned int get_sample_room_req_config(const struct intel_crtc_state *crtc_state) +{ + unsigned int h_active, h_total, pixel_clk; + unsigned int samples_room; + + h_active = crtc_state->hw.adjusted_mode.hdisplay; + h_total = crtc_state->hw.adjusted_mode.htotal; + pixel_clk = crtc_state->hw.adjusted_mode.clock; + + samples_room = ((((h_total - h_active) * ((crtc_state->port_clock * + ROUNDING_FACTOR) / pixel_clk)) / + ROUNDING_FACTOR) - 12) / ((48 / + crtc_state->lane_count) + 2); + + return samples_room; +} + +static void enable_audio_dsc_wa(struct intel_encoder *encoder, + const struct intel_crtc_state *crtc_state) +{ + struct drm_i915_private *i915 = to_i915(encoder->base.dev); + struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc); + enum pipe pipe = crtc->pipe; + unsigned int hblank_early_prog, samples_room, h_active; + unsigned int val; + + if (INTEL_GEN(i915) < 11) + return; + + h_active = crtc_state->hw.adjusted_mode.hdisplay; + + if (!(h_active && crtc_state->port_clock && crtc_state->lane_count && + crtc_state->pipe_bpp && i915->cdclk.hw.cdclk)) { + drm_err(&i915->drm, "Null Params rcvd for hblank early enabling\n"); + WARN_ON(1); + return; + } + + val = intel_de_read(i915, AUD_CONFIG_BE); + + if (INTEL_GEN(i915) == 11) + val |= HBLANK_EARLY_ENABLE_ICL(pipe); + else if (INTEL_GEN(i915) >= 12) + val |= HBLANK_EARLY_ENABLE_TGL(pipe); + + if (crtc_state->dsc.compression_enable && + (crtc_state->hw.adjusted_mode.hdisplay >= 3840 && + crtc_state->hw.adjusted_mode.vdisplay >= 2160)) { + /* Get hblank early enable value required */ + hblank_early_prog = get_hblank_early_enable_config(encoder, + crtc_state); + if (hblank_early_prog < 32) { + val &= ~HBLANK_START_COUNT_MASK(pipe); + val |= HBLANK_START_COUNT(pipe, HBLANK_START_COUNT_32); + } else if (hblank_early_prog < 64) { + val &= ~HBLANK_START_COUNT_MASK(pipe); + val |= HBLANK_START_COUNT(pipe, HBLANK_START_COUNT_64); + } else if (hblank_early_prog < 96) { + val &= ~HBLANK_START_COUNT_MASK(pipe); + val |= HBLANK_START_COUNT(pipe, HBLANK_START_COUNT_96); + } else { + val &= ~HBLANK_START_COUNT_MASK(pipe); + val |= HBLANK_START_COUNT(pipe, HBLANK_START_COUNT_128); + } + + /* Get samples room value required */ + samples_room = get_sample_room_req_config(crtc_state); + if (samples_room < 3) { + val &= ~NUMBER_SAMPLES_PER_LINE_MASK(pipe); + val |= NUMBER_SAMPLES_PER_LINE(pipe, samples_room); + } else { + /* Program 0 i.e "All Samples available in buffer" */ + val &= ~NUMBER_SAMPLES_PER_LINE_MASK(pipe); + val |= NUMBER_SAMPLES_PER_LINE(pipe, 0x0); + } + } + + intel_de_write(i915, AUD_CONFIG_BE, val); +} + +#undef ROUNDING_FACTOR + static void hsw_audio_codec_enable(struct intel_encoder *encoder, const struct intel_crtc_state *crtc_state, const struct drm_connector_state *conn_state) @@ -529,6 +672,10 @@ static void hsw_audio_codec_enable(struct intel_encoder *encoder, mutex_lock(&dev_priv->av_mutex); + /* Enable Audio WA for 4k DSC usecases */ + if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DP)) + enable_audio_dsc_wa(encoder, crtc_state); + /* Enable audio presence detect, invalidate ELD */ tmp = intel_de_read(dev_priv, HSW_AUD_PIN_ELD_CP_VLD); tmp |= AUDIO_OUTPUT_ENABLE(cpu_transcoder); diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 8cebb7a86b8c..f72ea2c2a8e3 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -9395,6 +9395,22 @@ enum { #define AUD_PIN_BUF_CTL _MMIO(0x48414) #define AUD_PIN_BUF_ENABLE REG_BIT(31) +/* Display Audio Config Reg */ +#define AUD_CONFIG_BE _MMIO(0x65ef0) +#define HBLANK_EARLY_ENABLE_ICL(pipe) (0x1 << (20 - (pipe))) +#define HBLANK_EARLY_ENABLE_TGL(pipe) (0x1 << (24 + (pipe))) +#define HBLANK_START_COUNT_MASK(pipe) (0x7 << (3 + ((pipe) * 6))) +#define HBLANK_START_COUNT(pipe, val) (((val) & 0x7) << (3 + ((pipe)) * 6)) +#define NUMBER_SAMPLES_PER_LINE_MASK(pipe) (0x3 << ((pipe) * 6)) +#define NUMBER_SAMPLES_PER_LINE(pipe, val) (((val) & 0x3) << ((pipe) * 6)) + +#define HBLANK_START_COUNT_8 0 +#define HBLANK_START_COUNT_16 1 +#define HBLANK_START_COUNT_32 2 +#define HBLANK_START_COUNT_64 3 +#define HBLANK_START_COUNT_96 4 +#define HBLANK_START_COUNT_128 5 + /* * HSW - ICL power wells *
For certain DP VDSC bpp settings, hblank asserts before hblank_early, leading to a bad audio state. Driver need to program "hblank early enable" and "samples per line" parameters in AUDIO_CONFIG_BE register. This is Display Audio WA #1406928334 for 4k+VDSC usecase applicable on DP encoders. Implemented the same. v2: Fixed build failures on 32bit machine. v3: Dropped u64, added helpers for sample room calculation, other general comments as per Jani Nikula's feedback. Also fixed connector type check (spotted by Anshuman) v4: Addressed Jani Nikula and Kai's review comments. Signed-off-by: Uma Shankar <uma.shankar@intel.com> --- drivers/gpu/drm/i915/display/intel_audio.c | 147 +++++++++++++++++++++ drivers/gpu/drm/i915/i915_reg.h | 16 +++ 2 files changed, 163 insertions(+)