On Mon, Sep 14, 2020 at 10:17:57PM +0300, Ville Syrjälä wrote:
> On Mon, Sep 14, 2020 at 12:00:33PM -0700, Navare, Manasi wrote:
> > On Mon, Sep 07, 2020 at 02:20:56PM +0300, Ville Syrjälä wrote:
> > > On Wed, Jul 15, 2020 at 03:42:15PM -0700, Manasi Navare wrote:
> > > > From: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
> > > > 
> > > > Small changes to intel_dp_mode_valid(), allow listing modes that
> > > > can only be supported in the bigjoiner configuration, which is
> > > > not supported yet.
> > > > 
> > > > eDP does not support bigjoiner, so do not expose bigjoiner only
> > > > modes on the eDP port.
> > > > 
> > > > v5:
> > > > * Increase max plane width to support 8K with bigjoiner (Maarten)
> > > > v4:
> > > > * Rebase (Manasi)
> > > > 
> > > > Changes since v1:
> > > > - Disallow bigjoiner on eDP.
> > > > Changes since v2:
> > > > - Rename intel_dp_downstream_max_dotclock to intel_dp_max_dotclock,
> > > >   and split off the downstream and source checking to its own function.
> > > >   (Ville)
> > > > v3:
> > > > * Rebase (Manasi)
> > > > 
> > > > Signed-off-by: Manasi Navare <manasi.d.nav...@intel.com>
> > > > Signed-off-by: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
> > > > ---
> > > >  drivers/gpu/drm/i915/display/intel_display.c |   2 +-
> > > >  drivers/gpu/drm/i915/display/intel_dp.c      | 119 ++++++++++++++-----
> > > >  2 files changed, 91 insertions(+), 30 deletions(-)
> > > > 
> > > > diff --git a/drivers/gpu/drm/i915/display/intel_display.c 
> > > > b/drivers/gpu/drm/i915/display/intel_display.c
> > > > index 78cbfefbfa62..3ecb642805a6 100644
> > > > --- a/drivers/gpu/drm/i915/display/intel_display.c
> > > > +++ b/drivers/gpu/drm/i915/display/intel_display.c
> > > > @@ -17400,7 +17400,7 @@ intel_mode_valid_max_plane_size(struct 
> > > > drm_i915_private *dev_priv,
> > > >          * too big for that.
> > > >          */
> > > >         if (INTEL_GEN(dev_priv) >= 11) {
> > > > -               plane_width_max = 5120;
> > > > +               plane_width_max = 7680;
> > > 
> > > This looks misplaced. Planes do no know whether bigjoiner can be used or
> > > not. They should not care in fact. The caller should have that knowledge
> > > and can deal with it properly.
> > 
> > Hmm, so the caller of intel_mode_valid_max_plane_size() should check on the 
> > bigjoiner
> > flag and perhaps if bigjoiner is true then increase the plane_width_max to 
> > 7680?
> > 
> > Am still not sure where this should happen? We need to have the plane max 
> > width to be 7680
> > before we prune the 8K mode in intel_mode_valid
> > 
> > Where should this be added according to you?
> 
> Hmm. I guess we do need to put it into this function given the way this
> is structured. However we still can't assume bigjoiner can be used since
> it can't be used on DDI A on icl. So we should probably just pass in a
> bool here to indicate whether bigjoiner can be used or not.
>

So in intel_dp_mode_valid() we set bigjoiner = true if not edp and higher clock.
I think here we need to do the platform check also, 1. because now we are 
enabling this for TGL+
where big joiner on all pipes. But we should still I think add GEN >=12 check 
before setting bigjoiner
to true in intel_dp_mode_valid() and then pass that to 
intel_mode_valid_max_plane_size(..., book bigjoiner)

Sounds good?

> Personally I'd just write the thing as something like:
> intel_mode_valid_max_plane_size(..., bool bigjoiner)
> {
>       ...
>       plane_width_max = 5120 << bigjoiner;
>       ...
> }
> 
> > 
> > Manasi
> > > 
> > > >                 plane_height_max = 4320;
> > > >         } else {
> > > >                 plane_width_max = 5120;
> > > > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c 
> > > > b/drivers/gpu/drm/i915/display/intel_dp.c
> > > > index d6295eb20b63..fbfea99fd804 100644
> > > > --- a/drivers/gpu/drm/i915/display/intel_dp.c
> > > > +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> > > > @@ -248,25 +248,37 @@ intel_dp_max_data_rate(int max_link_clock, int 
> > > > max_lanes)
> > > >         return max_link_clock * max_lanes;
> > > >  }
> > > >  
> > > > -static int
> > > > -intel_dp_downstream_max_dotclock(struct intel_dp *intel_dp)
> > > > +static int source_max_dotclock(struct intel_dp *intel_dp, bool 
> > > > allow_bigjoiner)
> > > >  {
> > > > -       struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
> > > > -       struct intel_encoder *encoder = &dig_port->base;
> > > > +       struct intel_digital_port *intel_dig_port = 
> > > > dp_to_dig_port(intel_dp);
> > > > +       struct intel_encoder *encoder = &intel_dig_port->base;
> > > >         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> > > > -       int max_dotclk = dev_priv->max_dotclk_freq;
> > > > -       int ds_max_dotclk;
> > > >  
> > > > +       if (allow_bigjoiner && INTEL_GEN(dev_priv) >= 11 && 
> > > > !intel_dp_is_edp(intel_dp))
> > > > +               return 2 * dev_priv->max_dotclk_freq;
> > > > +
> > > > +       return dev_priv->max_dotclk_freq;
> > > > +}
> > > > +
> > > > +static int downstream_max_dotclock(struct intel_dp *intel_dp)
> > > > +{
> > > >         int type = intel_dp->downstream_ports[0] & DP_DS_PORT_TYPE_MASK;
> > > >  
> > > >         if (type != DP_DS_PORT_TYPE_VGA)
> > > > -               return max_dotclk;
> > > > +               return 0;
> > > >  
> > > > -       ds_max_dotclk = drm_dp_downstream_max_clock(intel_dp->dpcd,
> > > > -                                                   
> > > > intel_dp->downstream_ports);
> > > > +       return drm_dp_downstream_max_clock(intel_dp->dpcd,
> > > > +                                          intel_dp->downstream_ports);
> > > > +}
> > > > +
> > > > +static int
> > > > +intel_dp_max_dotclock(struct intel_dp *intel_dp, bool allow_bigjoiner)
> > > > +{
> > > > +       int max_dotclk = source_max_dotclock(intel_dp, allow_bigjoiner);
> > > > +       int ds_max_dotclk = downstream_max_dotclock(intel_dp);
> > > >  
> > > >         if (ds_max_dotclk != 0)
> > > > -               max_dotclk = min(max_dotclk, ds_max_dotclk);
> > > > +               return min(max_dotclk, ds_max_dotclk);
> > > >  
> > > >         return max_dotclk;
> > > >  }
> > > > @@ -527,7 +539,8 @@ small_joiner_ram_size_bits(struct drm_i915_private 
> > > > *i915)
> > > >  
> > > >  static u16 intel_dp_dsc_get_output_bpp(struct drm_i915_private *i915,
> > > >                                        u32 link_clock, u32 lane_count,
> > > > -                                      u32 mode_clock, u32 
> > > > mode_hdisplay)
> > > > +                                      u32 mode_clock, u32 
> > > > mode_hdisplay,
> > > > +                                      bool bigjoiner)
> > > >  {
> > > >         u32 bits_per_pixel, max_bpp_small_joiner_ram;
> > > >         int i;
> > > > @@ -545,6 +558,10 @@ static u16 intel_dp_dsc_get_output_bpp(struct 
> > > > drm_i915_private *i915,
> > > >         /* Small Joiner Check: output bpp <= joiner RAM (bits) / Horiz. 
> > > > width */
> > > >         max_bpp_small_joiner_ram = small_joiner_ram_size_bits(i915) /
> > > >                 mode_hdisplay;
> > > > +
> > > > +       if (bigjoiner)
> > > > +               max_bpp_small_joiner_ram *= 2;
> > > > +
> > > >         drm_dbg_kms(&i915->drm, "Max small joiner bpp: %u\n",
> > > >                     max_bpp_small_joiner_ram);
> > > >  
> > > > @@ -554,6 +571,15 @@ static u16 intel_dp_dsc_get_output_bpp(struct 
> > > > drm_i915_private *i915,
> > > >          */
> > > >         bits_per_pixel = min(bits_per_pixel, max_bpp_small_joiner_ram);
> > > >  
> > > > +       if (bigjoiner) {
> > > > +               u32 max_bpp_bigjoiner =
> > > > +                       i915->max_cdclk_freq * 48 /
> > > > +                       intel_dp_mode_to_fec_clock(mode_clock);
> > > > +
> > > > +               DRM_DEBUG_KMS("Max big joiner bpp: %u\n", 
> > > > max_bpp_bigjoiner);
> > > > +               bits_per_pixel = min(bits_per_pixel, max_bpp_bigjoiner);
> > > > +       }
> > > > +
> > > >         /* Error out if the max bpp is less than smallest allowed valid 
> > > > bpp */
> > > >         if (bits_per_pixel < valid_dsc_bpp[0]) {
> > > >                 drm_dbg_kms(&i915->drm, "Unsupported BPP %u, min %u\n",
> > > > @@ -576,7 +602,8 @@ static u16 intel_dp_dsc_get_output_bpp(struct 
> > > > drm_i915_private *i915,
> > > >  }
> > > >  
> > > >  static u8 intel_dp_dsc_get_slice_count(struct intel_dp *intel_dp,
> > > > -                                      int mode_clock, int 
> > > > mode_hdisplay)
> > > > +                                      int mode_clock, int 
> > > > mode_hdisplay,
> > > > +                                      bool bigjoiner)
> > > >  {
> > > >         struct drm_i915_private *i915 = dp_to_i915(intel_dp);
> > > >         u8 min_slice_count, i;
> > > > @@ -603,12 +630,20 @@ static u8 intel_dp_dsc_get_slice_count(struct 
> > > > intel_dp *intel_dp,
> > > >  
> > > >         /* Find the closest match to the valid slice count values */
> > > >         for (i = 0; i < ARRAY_SIZE(valid_dsc_slicecount); i++) {
> > > > -               if (valid_dsc_slicecount[i] >
> > > > -                   drm_dp_dsc_sink_max_slice_count(intel_dp->dsc_dpcd,
> > > > -                                                   false))
> > > > +               u8 test_slice_count = bigjoiner ?
> > > > +                       2 * valid_dsc_slicecount[i] :
> > > > +                       valid_dsc_slicecount[i];
> > > > +
> > > > +               if (test_slice_count >
> > > > +                   drm_dp_dsc_sink_max_slice_count(intel_dp->dsc_dpcd, 
> > > > false))
> > > >                         break;
> > > > -               if (min_slice_count  <= valid_dsc_slicecount[i])
> > > > -                       return valid_dsc_slicecount[i];
> > > > +
> > > > +               /* big joiner needs small joiner to be enabled */
> > > > +               if (bigjoiner && test_slice_count < 4)
> > > > +                       continue;
> > > > +
> > > > +               if (min_slice_count <= test_slice_count)
> > > > +                       return test_slice_count;
> > > >         }
> > > >  
> > > >         drm_dbg_kms(&i915->drm, "Unsupported Slice Count %d\n",
> > > > @@ -648,11 +683,15 @@ intel_dp_mode_valid(struct drm_connector 
> > > > *connector,
> > > >         int max_dotclk;
> > > >         u16 dsc_max_output_bpp = 0;
> > > >         u8 dsc_slice_count = 0;
> > > > +       bool dsc = false, bigjoiner = false;
> > > >  
> > > >         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
> > > >                 return MODE_NO_DBLESCAN;
> > > >  
> > > > -       max_dotclk = intel_dp_downstream_max_dotclock(intel_dp);
> > > > +       if (mode->flags & DRM_MODE_FLAG_DBLCLK)
> > > > +               return MODE_H_ILLEGAL;
> > > > +
> > > > +       max_dotclk = intel_dp_max_dotclock(intel_dp, false);
> > > >  
> > > >         if (intel_dp_is_edp(intel_dp) && fixed_mode) {
> > > >                 if (mode->hdisplay > fixed_mode->hdisplay)
> > > > @@ -664,6 +703,21 @@ intel_dp_mode_valid(struct drm_connector 
> > > > *connector,
> > > >                 target_clock = fixed_mode->clock;
> > > >         }
> > > >  
> > > > +       if (mode->clock < 10000)
> > > > +               return MODE_CLOCK_LOW;
> > > > +
> > > > +       if (target_clock > max_dotclk) {
> > > > +               if (intel_dp_is_edp(intel_dp))
> > > > +                       return MODE_CLOCK_HIGH;
> > > > +
> > > > +               max_dotclk = intel_dp_max_dotclock(intel_dp, true);
> > > > +
> > > > +               if (target_clock > max_dotclk)
> > > > +                       return MODE_CLOCK_HIGH;
> > > > +
> > > > +               bigjoiner = true;
> > > > +       }
> > > > +
> > > >         max_link_clock = intel_dp_max_link_rate(intel_dp);
> > > >         max_lanes = intel_dp_max_lane_count(intel_dp);
> > > >  
> > > > @@ -691,23 +745,28 @@ intel_dp_mode_valid(struct drm_connector 
> > > > *connector,
> > > >                                                             
> > > > max_link_clock,
> > > >                                                             max_lanes,
> > > >                                                             
> > > > target_clock,
> > > > -                                                           
> > > > mode->hdisplay) >> 4;
> > > > +                                                           
> > > > mode->hdisplay,
> > > > +                                                           bigjoiner) 
> > > > >> 4;
> > > >                         dsc_slice_count =
> > > >                                 intel_dp_dsc_get_slice_count(intel_dp,
> > > >                                                              
> > > > target_clock,
> > > > -                                                            
> > > > mode->hdisplay);
> > > > +                                                            
> > > > mode->hdisplay,
> > > > +                                                            bigjoiner);
> > > >                 }
> > > > +
> > > > +               dsc = dsc_max_output_bpp && dsc_slice_count;
> > > >         }
> > > >  
> > > > -       if ((mode_rate > max_rate && !(dsc_max_output_bpp && 
> > > > dsc_slice_count)) ||
> > > > -           target_clock > max_dotclk)
> > > > +       /* big joiner configuration needs DSC */
> > > > +       if (bigjoiner && !dsc) {
> > > > +               DRM_DEBUG_KMS("Link clock needs bigjoiner, but DSC or 
> > > > FEC not available\n");
> > > >                 return MODE_CLOCK_HIGH;
> > > > +       }
> > > >  
> > > > -       if (mode->clock < 10000)
> > > > -               return MODE_CLOCK_LOW;
> > > > -
> > > > -       if (mode->flags & DRM_MODE_FLAG_DBLCLK)
> > > > -               return MODE_H_ILLEGAL;
> > > > +       if (mode_rate > max_rate && !dsc) {
> > > > +               DRM_DEBUG_KMS("Cannot drive without DSC\n");
> > > > +               return MODE_CLOCK_HIGH;
> > > > +       }
> > > >  
> > > >         return intel_mode_valid_max_plane_size(dev_priv, mode);
> > > >  }
> > > > @@ -2204,11 +2263,13 @@ static int intel_dp_dsc_compute_config(struct 
> > > > intel_dp *intel_dp,
> > > >                                                     
> > > > pipe_config->port_clock,
> > > >                                                     
> > > > pipe_config->lane_count,
> > > >                                                     
> > > > adjusted_mode->crtc_clock,
> > > > -                                                   
> > > > adjusted_mode->crtc_hdisplay);
> > > > +                                                   
> > > > adjusted_mode->crtc_hdisplay,
> > > > +                                                   false);
> > > >                 dsc_dp_slice_count =
> > > >                         intel_dp_dsc_get_slice_count(intel_dp,
> > > >                                                      
> > > > adjusted_mode->crtc_clock,
> > > > -                                                    
> > > > adjusted_mode->crtc_hdisplay);
> > > > +                                                    
> > > > adjusted_mode->crtc_hdisplay,
> > > > +                                                    false);
> > > >                 if (!dsc_max_output_bpp || !dsc_dp_slice_count) {
> > > >                         drm_dbg_kms(&dev_priv->drm,
> > > >                                     "Compressed BPP/Slice Count not 
> > > > supported\n");
> > > > -- 
> > > > 2.19.1
> > > > 
> > > > _______________________________________________
> > > > Intel-gfx mailing list
> > > > Intel-gfx@lists.freedesktop.org
> > > > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
> > > 
> > > -- 
> > > Ville Syrjälä
> > > Intel
> 
> -- 
> Ville Syrjälä
> Intel
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