> Subject: [Intel-gfx] [PATCH 3/9] drm/i915/display: Consider fractional vdsc > bpp while computing m_n values > > MTL+ supports fractional compressed bits_per_pixel, with precision of > 1/16. This compressed bpp is stored in U6.4 format. > Accommodate this precision while computing m_n values. > > Signed-off-by: Ankit Nautiyal <[email protected]> > --- > drivers/gpu/drm/i915/display/intel_display.c | 6 +++++- > drivers/gpu/drm/i915/display/intel_display.h | 2 +- > drivers/gpu/drm/i915/display/intel_dp.c | 7 ++++--- > drivers/gpu/drm/i915/display/intel_dp_mst.c | 6 ++++-- > drivers/gpu/drm/i915/display/intel_fdi.c | 2 +- > 5 files changed, 15 insertions(+), 8 deletions(-) > > diff --git a/drivers/gpu/drm/i915/display/intel_display.c > b/drivers/gpu/drm/i915/display/intel_display.c > index 8c81206ce90d..9af36e600c87 100644 > --- a/drivers/gpu/drm/i915/display/intel_display.c > +++ b/drivers/gpu/drm/i915/display/intel_display.c > @@ -2380,10 +2380,14 @@ void > intel_link_compute_m_n(u16 bits_per_pixel, int nlanes, > int pixel_clock, int link_clock, > struct intel_link_m_n *m_n, > - bool fec_enable) > + bool fec_enable, > + bool is_dsc_fractional_bpp) > { > u32 data_clock = bits_per_pixel * pixel_clock; > > + if (is_dsc_fractional_bpp) > + data_clock = DIV_ROUND_UP(bits_per_pixel * pixel_clock, > 16); > +
Is there any mention of this in bspec or dsc spec if so can you add that in commit message. > if (fec_enable) > data_clock = intel_dp_mode_to_fec_clock(data_clock); > > diff --git a/drivers/gpu/drm/i915/display/intel_display.h > b/drivers/gpu/drm/i915/display/intel_display.h > index 49ac8473b988..a4c4ca3cad65 100644 > --- a/drivers/gpu/drm/i915/display/intel_display.h > +++ b/drivers/gpu/drm/i915/display/intel_display.h > @@ -398,7 +398,7 @@ u8 intel_calc_active_pipes(struct intel_atomic_state > *state, void intel_link_compute_m_n(u16 bpp, int nlanes, > int pixel_clock, int link_clock, > struct intel_link_m_n *m_n, > - bool fec_enable); > + bool fec_enable, bool is_dsc_fractional_bpp); > u32 intel_plane_fb_max_stride(struct drm_i915_private *dev_priv, > u32 pixel_format, u64 modifier); enum > drm_mode_status diff --git a/drivers/gpu/drm/i915/display/intel_dp.c > b/drivers/gpu/drm/i915/display/intel_dp.c > index 32d0bee11f53..436889c601b1 100644 > --- a/drivers/gpu/drm/i915/display/intel_dp.c > +++ b/drivers/gpu/drm/i915/display/intel_dp.c > @@ -2557,7 +2557,7 @@ intel_dp_drrs_compute_config(struct > intel_connector *connector, > > intel_link_compute_m_n(link_bpp, pipe_config->lane_count, > pixel_clock, > pipe_config->port_clock, &pipe_config- > >dp_m2_n2, > - pipe_config->fec_enable); > + pipe_config->fec_enable, false); > > /* FIXME: abstract this better */ > if (pipe_config->splitter.enable) > @@ -2703,7 +2703,7 @@ intel_dp_compute_config(struct intel_encoder > *encoder, > intel_dp_limited_color_range(pipe_config, conn_state); > > if (pipe_config->dsc.compression_enable) > - link_bpp = dsc_integral_compressed_bpp(pipe_config- > >dsc.compressed_bpp); > + link_bpp = pipe_config->dsc.compressed_bpp; In the second patch you added this but you end up deleting it here which I believe is a mistake Regards, Suraj Kandpal > else > link_bpp = intel_dp_output_bpp(pipe_config- > >output_format, > pipe_config->pipe_bpp); > @@ -2735,7 +2735,8 @@ intel_dp_compute_config(struct intel_encoder > *encoder, > adjusted_mode->crtc_clock, > pipe_config->port_clock, > &pipe_config->dp_m_n, > - pipe_config->fec_enable); > + pipe_config->fec_enable, > + pipe_config->dsc.compression_enable); > > /* FIXME: abstract this better */ > if (pipe_config->splitter.enable) > diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c > b/drivers/gpu/drm/i915/display/intel_dp_mst.c > index 3eb085fbc7c8..e224eebe7c17 100644 > --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c > +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c > @@ -171,7 +171,8 @@ static int intel_dp_mst_compute_link_config(struct > intel_encoder *encoder, > adjusted_mode->crtc_clock, > crtc_state->port_clock, > &crtc_state->dp_m_n, > - crtc_state->fec_enable); > + crtc_state->fec_enable, > + false); > crtc_state->dp_m_n.tu = slots; > > return 0; > @@ -265,7 +266,8 @@ static int > intel_dp_dsc_mst_compute_link_config(struct intel_encoder *encoder, > adjusted_mode->crtc_clock, > crtc_state->port_clock, > &crtc_state->dp_m_n, > - crtc_state->fec_enable); > + crtc_state->fec_enable, > + crtc_state->dsc.compression_enable); > crtc_state->dp_m_n.tu = slots; > > return 0; > diff --git a/drivers/gpu/drm/i915/display/intel_fdi.c > b/drivers/gpu/drm/i915/display/intel_fdi.c > index e12b46a84fa1..15fddabf7c2e 100644 > --- a/drivers/gpu/drm/i915/display/intel_fdi.c > +++ b/drivers/gpu/drm/i915/display/intel_fdi.c > @@ -259,7 +259,7 @@ int ilk_fdi_compute_config(struct intel_crtc *crtc, > pipe_config->fdi_lanes = lane; > > intel_link_compute_m_n(pipe_config->pipe_bpp, lane, fdi_dotclock, > - link_bw, &pipe_config->fdi_m_n, false); > + link_bw, &pipe_config->fdi_m_n, false, false); > > ret = ilk_check_fdi_lanes(dev, crtc->pipe, pipe_config); > if (ret == -EDEADLK) > -- > 2.40.1
