On 6/26/2024 1:48 PM, Stanislav Lisovskiy wrote:
Implement required changes for mode validation and compute config,
to support Ultrajoiner.
This also includes required DSC changes and checks.

Signed-off-by: Stanislav Lisovskiy <stanislav.lisovs...@intel.com>
---
  drivers/gpu/drm/i915/display/intel_display.c |   5 +-
  drivers/gpu/drm/i915/display/intel_display.h |   3 +-
  drivers/gpu/drm/i915/display/intel_dp.c      | 117 ++++++++++++++-----
  drivers/gpu/drm/i915/display/intel_dp.h      |  18 ++-
  drivers/gpu/drm/i915/display/intel_dp_mst.c  |  35 +++---
  drivers/gpu/drm/i915/display/intel_dsi.c     |   2 +-
  drivers/gpu/drm/i915/display/intel_hdmi.c    |  14 ++-
  drivers/gpu/drm/i915/display/intel_vdsc.c    |  25 +++-
  8 files changed, 164 insertions(+), 55 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c 
b/drivers/gpu/drm/i915/display/intel_display.c
index f702ead9b5f3..4c934f07ead7 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -8246,7 +8246,8 @@ enum drm_mode_status 
intel_cpu_transcoder_mode_valid(struct drm_i915_private *de
  enum drm_mode_status
  intel_mode_valid_max_plane_size(struct drm_i915_private *dev_priv,
                                const struct drm_display_mode *mode,
-                               bool joiner)
+                               bool bigjoiner,
+                               bool ultrajoiner)
  {
        int plane_width_max, plane_height_max;
@@ -8263,7 +8264,7 @@ intel_mode_valid_max_plane_size(struct drm_i915_private *dev_priv,
         * too big for that.
         */
        if (DISPLAY_VER(dev_priv) >= 11) {
-               plane_width_max = 5120 << joiner;
+               plane_width_max = (5120 << bigjoiner) << ultrajoiner;
                plane_height_max = 4320;
        } else {
                plane_width_max = 5120;
diff --git a/drivers/gpu/drm/i915/display/intel_display.h 
b/drivers/gpu/drm/i915/display/intel_display.h
index bac81b7ab764..0a51f24af405 100644
--- a/drivers/gpu/drm/i915/display/intel_display.h
+++ b/drivers/gpu/drm/i915/display/intel_display.h
@@ -415,7 +415,8 @@ u32 intel_plane_fb_max_stride(struct drm_i915_private 
*dev_priv,
  enum drm_mode_status
  intel_mode_valid_max_plane_size(struct drm_i915_private *dev_priv,
                                const struct drm_display_mode *mode,
-                               bool joiner);
+                               bool bigjoiner,
+                               bool ultrajoiner);

Can we use joined_pipes here and in other places instead of 2 separate variables?

So we pass joined_pipes as either 0, 2, 4 for no-joiner, big-joiner, and ultra-joiner.

This will help simplifying the computations for example for slice count (mentioned inline).

We can perhaps have a patch only with this change, just replacing 'joiner' with joined_pipes and later just send joined_pipes with 4 for ultra joiner in another patch?


  enum drm_mode_status
  intel_cpu_transcoder_mode_valid(struct drm_i915_private *i915,
                                const struct drm_display_mode *mode);
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c 
b/drivers/gpu/drm/i915/display/intel_dp.c
index 3903f6ead6e6..1ea1e89d8f45 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -760,33 +760,41 @@ u32 intel_dp_dsc_nearest_valid_bpp(struct 
drm_i915_private *i915, u32 bpp, u32 p
  static
  u32 get_max_compressed_bpp_with_joiner(struct drm_i915_private *i915,
                                       u32 mode_clock, u32 mode_hdisplay,
-                                      bool bigjoiner)
+                                      bool bigjoiner, bool ultrajoiner)
  {
        u32 max_bpp_small_joiner_ram;
+       u32 max_bpp_joiner;
/* Small Joiner Check: output bpp <= joiner RAM (bits) / Horiz. width */
-       max_bpp_small_joiner_ram = small_joiner_ram_size_bits(i915) / 
mode_hdisplay;
+       max_bpp_joiner = max_bpp_small_joiner_ram =
+               small_joiner_ram_size_bits(i915) / mode_hdisplay;
- if (bigjoiner) {
-               int bigjoiner_interface_bits = DISPLAY_VER(i915) >= 14 ? 36 : 
24;
-               /* With bigjoiner multiple dsc engines are used in parallel so 
PPC is 2 */
+       /* if ultra joiner is enabled, we have 2 bigjoiners enabled */
+       if (bigjoiner || ultrajoiner) {
+               int joiner_interface_bits = DISPLAY_VER(i915) >= 14 ? 36 : 24;
+               /* With joiner multiple dsc engines are used in parallel so PPC 
is 2 */
                int ppc = 2;
-               u32 max_bpp_bigjoiner =
-                       i915->display.cdclk.max_cdclk_freq * ppc * 
bigjoiner_interface_bits /
+               max_bpp_joiner =
+                       i915->display.cdclk.max_cdclk_freq * ppc * 
joiner_interface_bits /
                        intel_dp_mode_to_fec_clock(mode_clock);
max_bpp_small_joiner_ram *= 2;
+       }
- return min(max_bpp_small_joiner_ram, max_bpp_bigjoiner);
+       if (ultrajoiner) {
+               /* both get multiplied by 2, because ram bits/ppc now doubled */
+               max_bpp_small_joiner_ram *= 2;
+               max_bpp_joiner *= 2;
        }
- return max_bpp_small_joiner_ram;
+       return min(max_bpp_small_joiner_ram, max_bpp_joiner);
  }
u16 intel_dp_dsc_get_max_compressed_bpp(struct drm_i915_private *i915,
                                        u32 link_clock, u32 lane_count,
                                        u32 mode_clock, u32 mode_hdisplay,
                                        bool bigjoiner,
+                                       bool ultrajoiner,
                                        enum intel_output_format output_format,
                                        u32 pipe_bpp,
                                        u32 timeslots)
@@ -832,7 +840,7 @@ u16 intel_dp_dsc_get_max_compressed_bpp(struct 
drm_i915_private *i915,
                                intel_dp_mode_to_fec_clock(mode_clock));
joiner_max_bpp = get_max_compressed_bpp_with_joiner(i915, mode_clock,
-                                                           mode_hdisplay, 
bigjoiner);
+                                                           mode_hdisplay, 
bigjoiner, ultrajoiner);
        bits_per_pixel = min(bits_per_pixel, joiner_max_bpp);
bits_per_pixel = intel_dp_dsc_nearest_valid_bpp(i915, bits_per_pixel, pipe_bpp);
@@ -842,7 +850,8 @@ u16 intel_dp_dsc_get_max_compressed_bpp(struct 
drm_i915_private *i915,
u8 intel_dp_dsc_get_slice_count(const struct intel_connector *connector,
                                int mode_clock, int mode_hdisplay,
-                               bool bigjoiner)
+                               bool bigjoiner,
+                               bool ultrajoiner)
  {
        struct drm_i915_private *i915 = to_i915(connector->base.dev);
        u8 min_slice_count, i;
@@ -876,7 +885,7 @@ u8 intel_dp_dsc_get_slice_count(const struct 
intel_connector *connector,
/* Find the closest match to the valid slice count values */
        for (i = 0; i < ARRAY_SIZE(valid_dsc_slicecount); i++) {
-               u8 test_slice_count = valid_dsc_slicecount[i] << bigjoiner;
+               u8 test_slice_count = (valid_dsc_slicecount[i] << bigjoiner) << 
ultrajoiner;

If we use joined_pipes as mentioned earlier, we can perhaps just use:

u8 test_slice_count = valid_dsc_slicecount[i] << (joined_pipes / 2);


Regards,

Ankit



if (test_slice_count >
                    drm_dp_dsc_sink_max_slice_count(connector->dp.dsc_dpcd, 
false))
@@ -886,6 +895,10 @@ u8 intel_dp_dsc_get_slice_count(const struct 
intel_connector *connector,
                if (bigjoiner && test_slice_count < 4)
                        continue;
+ /* ultrajoiner needs 2 bigjoiners to be enabled */
+               if (ultrajoiner && test_slice_count < 8)
+                       continue;
+
                if (min_slice_count <= test_slice_count)
                        return test_slice_count;
        }
@@ -1162,9 +1175,9 @@ intel_dp_mode_valid_downstream(struct intel_connector 
*connector,
        return MODE_OK;
  }
-bool intel_dp_need_joiner(struct intel_dp *intel_dp,
-                         struct intel_connector *connector,
-                         int hdisplay, int clock)
+bool intel_dp_need_bigjoiner(struct intel_dp *intel_dp,
+                            struct intel_connector *connector,
+                            int hdisplay, int clock)
  {
        struct drm_i915_private *i915 = dp_to_i915(intel_dp);
@@ -1195,6 +1208,35 @@ bool intel_dp_has_dsc(const struct intel_connector *connector)
        return true;
  }
+static
+bool intel_can_ultrajoiner(const struct intel_encoder *encoder)
+{
+       struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+
+       return IS_DGFX(i915) && DISPLAY_VER(i915) >= 14;
+}
+
+bool intel_dp_need_ultrajoiner(struct intel_dp *dp, int clock)
+{
+       const struct intel_encoder *encoder = &dp_to_dig_port(dp)->base;
+       struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+
+       if (!intel_can_ultrajoiner(encoder))
+               return false;
+
+       return clock > (i915->display.cdclk.max_dotclk_freq * 2);
+}
+
+bool intel_is_bigjoiner(const struct intel_crtc_state *pipe_config)
+{
+       return hweight8(pipe_config->joiner_pipes) == 2;
+}
+
+bool intel_is_ultrajoiner(const struct intel_crtc_state *pipe_config)
+{
+       return hweight8(pipe_config->joiner_pipes) == 4;
+}
+
  static enum drm_mode_status
  intel_dp_mode_valid(struct drm_connector *_connector,
                    struct drm_display_mode *mode)
@@ -1209,7 +1251,7 @@ intel_dp_mode_valid(struct drm_connector *_connector,
        u16 dsc_max_compressed_bpp = 0;
        u8 dsc_slice_count = 0;
        enum drm_mode_status status;
-       bool dsc = false, joiner = false;
+       bool dsc = false, bigjoiner = false, ultrajoiner = false;
status = intel_cpu_transcoder_mode_valid(dev_priv, mode);
        if (status != MODE_OK)
@@ -1230,11 +1272,16 @@ intel_dp_mode_valid(struct drm_connector *_connector,
                target_clock = fixed_mode->clock;
        }
- if (intel_dp_need_joiner(intel_dp, connector,
-                                mode->hdisplay, target_clock)) {
-               joiner = true;
+       if (intel_dp_need_ultrajoiner(intel_dp, target_clock)) {
+               ultrajoiner = true;
+               max_dotclk *= 4;
+       }
+       else if (intel_dp_need_bigjoiner(intel_dp, connector,
+                                   mode->hdisplay, target_clock)) {
+               bigjoiner = true;
                max_dotclk *= 2;
        }
+
        if (target_clock > max_dotclk)
                return MODE_CLOCK_HIGH;
@@ -1278,20 +1325,22 @@ intel_dp_mode_valid(struct drm_connector *_connector,
                                                                    max_lanes,
                                                                    
target_clock,
                                                                    
mode->hdisplay,
-                                                                   joiner,
+                                                                   bigjoiner,
+                                                                   ultrajoiner,
                                                                    
output_format,
                                                                    pipe_bpp, 
64);
                        dsc_slice_count =
                                intel_dp_dsc_get_slice_count(connector,
                                                             target_clock,
                                                             mode->hdisplay,
-                                                            joiner);
+                                                            bigjoiner,
+                                                            ultrajoiner);
                }
dsc = dsc_max_compressed_bpp && dsc_slice_count;
        }
- if (intel_dp_joiner_needs_dsc(dev_priv, joiner) && !dsc)
+       if (intel_dp_joiner_needs_dsc(dev_priv, bigjoiner, ultrajoiner) && !dsc)
                return MODE_CLOCK_HIGH;
if (mode_rate > max_rate && !dsc)
@@ -1301,7 +1350,7 @@ intel_dp_mode_valid(struct drm_connector *_connector,
        if (status != MODE_OK)
                return status;
- return intel_mode_valid_max_plane_size(dev_priv, mode, joiner);
+       return intel_mode_valid_max_plane_size(dev_priv, mode, bigjoiner, 
ultrajoiner);
  }
bool intel_dp_source_supports_tps3(struct drm_i915_private *i915)
@@ -2015,7 +2064,8 @@ static int dsc_compute_compressed_bpp(struct intel_dp 
*intel_dp,
dsc_joiner_max_bpp = get_max_compressed_bpp_with_joiner(i915, adjusted_mode->clock,
                                                                
adjusted_mode->hdisplay,
-                                                               
pipe_config->joiner_pipes);
+                                                               
intel_is_bigjoiner(pipe_config),
+                                                               
intel_is_ultrajoiner(pipe_config));
        dsc_max_bpp = min(dsc_max_bpp, dsc_joiner_max_bpp);
        dsc_max_bpp = min(dsc_max_bpp, to_bpp_int(limits->link.max_bpp_x16));
@@ -2249,7 +2299,8 @@ int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
                        intel_dp_dsc_get_slice_count(connector,
                                                     adjusted_mode->crtc_clock,
                                                     
adjusted_mode->crtc_hdisplay,
-                                                    pipe_config->joiner_pipes);
+                                                    
intel_is_bigjoiner(pipe_config),
+                                                    
intel_is_ultrajoiner(pipe_config));
                if (!dsc_dp_slice_count) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "Compressed Slice Count not supported\n");
@@ -2399,14 +2450,15 @@ int intel_dp_config_required_rate(const struct 
intel_crtc_state *crtc_state)
        return intel_dp_link_required(adjusted_mode->crtc_clock, bpp);
  }
-bool intel_dp_joiner_needs_dsc(struct drm_i915_private *i915, bool use_joiner)
+bool intel_dp_joiner_needs_dsc(struct drm_i915_private *i915, bool bigjoiner, 
bool ultrajoiner)
  {
        /*
         * Pipe joiner needs compression up to display 12 due to bandwidth
         * limitation. DG2 onwards pipe joiner can be enabled without
         * compression.
+        * Ultrajoiner always needs compression.
         */
-       return DISPLAY_VER(i915) < 13 && use_joiner;
+       return (DISPLAY_VER(i915) < 13 && bigjoiner) || ultrajoiner;
  }
static int
@@ -2424,18 +2476,21 @@ intel_dp_compute_link_config(struct intel_encoder 
*encoder,
        struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
        struct link_config_limits limits;
        bool dsc_needed, joiner_needs_dsc;
+       bool bigjoiner = false, ultrajoiner = false;
        int ret = 0;
if (pipe_config->fec_enable &&
            !intel_dp_supports_fec(intel_dp, connector, pipe_config))
                return -EINVAL;
- if (intel_dp_need_joiner(intel_dp, connector,
-                                adjusted_mode->crtc_hdisplay,
-                                adjusted_mode->crtc_clock))
+       if (intel_dp_need_ultrajoiner(intel_dp, adjusted_mode->crtc_clock))
+               pipe_config->joiner_pipes = GENMASK(crtc->pipe + 3, crtc->pipe);
+       else if (intel_dp_need_bigjoiner(intel_dp, connector,
+                                        adjusted_mode->crtc_hdisplay,
+                                        adjusted_mode->crtc_clock))
                pipe_config->joiner_pipes = GENMASK(crtc->pipe + 1, crtc->pipe);
- joiner_needs_dsc = intel_dp_joiner_needs_dsc(i915, pipe_config->joiner_pipes);
+       joiner_needs_dsc = intel_dp_joiner_needs_dsc(i915, bigjoiner, 
ultrajoiner);
dsc_needed = joiner_needs_dsc || intel_dp->force_dsc_en ||
                     !intel_dp_compute_config_limits(intel_dp, pipe_config,
diff --git a/drivers/gpu/drm/i915/display/intel_dp.h 
b/drivers/gpu/drm/i915/display/intel_dp.h
index a0f990a95ecc..6a3615757c95 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.h
+++ b/drivers/gpu/drm/i915/display/intel_dp.h
@@ -122,7 +122,7 @@ int intel_dp_effective_data_rate(int pixel_clock, int 
bpp_x16,
                                 int bw_overhead);
  int intel_dp_max_link_data_rate(struct intel_dp *intel_dp,
                                int max_dprx_rate, int max_dprx_lanes);
-bool intel_dp_joiner_needs_dsc(struct drm_i915_private *i915, bool use_joiner);
+bool intel_dp_joiner_needs_dsc(struct drm_i915_private *i915, bool 
use_bigjoiner, bool use_ultrajoiner);
  bool intel_dp_has_joiner(struct intel_dp *intel_dp);
  bool intel_dp_needs_vsc_sdp(const struct intel_crtc_state *crtc_state,
                            const struct drm_connector_state *conn_state);
@@ -142,6 +142,7 @@ u16 intel_dp_dsc_get_max_compressed_bpp(struct 
drm_i915_private *i915,
                                        u32 link_clock, u32 lane_count,
                                        u32 mode_clock, u32 mode_hdisplay,
                                        bool bigjoiner,
+                                       bool ultrajoiner,
                                        enum intel_output_format output_format,
                                        u32 pipe_bpp,
                                        u32 timeslots);
@@ -151,10 +152,17 @@ int intel_dp_dsc_sink_max_compressed_bpp(const struct 
intel_connector *connector
                                         int bpc);
  u8 intel_dp_dsc_get_slice_count(const struct intel_connector *connector,
                                int mode_clock, int mode_hdisplay,
-                               bool bigjoiner);
-bool intel_dp_need_joiner(struct intel_dp *intel_dp,
-                         struct intel_connector *connector,
-                         int hdisplay, int clock);
+                               bool bigjoiner, bool ultrajoiner);
+bool intel_dp_need_bigjoiner(struct intel_dp *intel_dp,
+                            struct intel_connector *connector,
+                            int hdisplay, int clock);
+bool intel_dp_need_ultrajoiner(struct intel_dp *intel_dp, int clock);
+bool intel_is_bigjoiner(const struct intel_crtc_state *pipe_config);
+bool intel_is_ultrajoiner(const struct intel_crtc_state *pipe_config);
+bool intel_crtc_is_bigjoiner_slave(const struct intel_crtc_state *crtc_state);
+bool intel_crtc_is_bigjoiner_master(const struct intel_crtc_state *crtc_state);
+bool intel_crtc_is_joiner_primary_master(const struct intel_crtc_state 
*crtc_state);
+enum pipe intel_crtc_master_pipe(const struct intel_crtc_state *crtc_state);
static inline unsigned int intel_dp_unused_lane_mask(int lane_count)
  {
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c 
b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index 27ce5c3f5951..13828c011d9c 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -105,7 +105,8 @@ static int intel_dp_mst_bw_overhead(const struct 
intel_crtc_state *crtc_state,
                dsc_slice_count = intel_dp_dsc_get_slice_count(connector,
                                                               
adjusted_mode->clock,
                                                               
adjusted_mode->hdisplay,
-                                                              
crtc_state->joiner_pipes);
+                                                              
intel_is_bigjoiner(crtc_state),
+                                                              
intel_is_ultrajoiner(crtc_state));
        }
overhead = drm_dp_bw_overhead(crtc_state->lane_count,
@@ -576,16 +577,19 @@ static int intel_dp_mst_compute_config(struct 
intel_encoder *encoder,
        if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
                return -EINVAL;
- if (intel_dp_need_joiner(intel_dp, connector,
-                                adjusted_mode->crtc_hdisplay,
-                                adjusted_mode->crtc_clock))
+       if (intel_dp_need_ultrajoiner(intel_dp, adjusted_mode->crtc_clock))
+               pipe_config->joiner_pipes = GENMASK(crtc->pipe + 3, crtc->pipe);
+       else if (intel_dp_need_bigjoiner(intel_dp, connector,
+                                   adjusted_mode->crtc_hdisplay,
+                                   adjusted_mode->crtc_clock))
                pipe_config->joiner_pipes = GENMASK(crtc->pipe + 1, crtc->pipe);
pipe_config->sink_format = INTEL_OUTPUT_FORMAT_RGB;
        pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
        pipe_config->has_pch_encoder = false;
- joiner_needs_dsc = intel_dp_joiner_needs_dsc(dev_priv, pipe_config->joiner_pipes);
+       joiner_needs_dsc = intel_dp_joiner_needs_dsc(dev_priv, 
intel_is_bigjoiner(pipe_config),
+                                                    
intel_is_ultrajoiner(pipe_config));
dsc_needed = joiner_needs_dsc || intel_dp->force_dsc_en ||
                     !intel_dp_mst_compute_config_limits(intel_dp,
@@ -1388,7 +1392,7 @@ intel_dp_mst_mode_valid_ctx(struct drm_connector 
*connector,
        int max_dotclk = to_i915(connector->dev)->display.cdclk.max_dotclk_freq;
        int max_rate, mode_rate, max_lanes, max_link_clock;
        int ret;
-       bool dsc = false, joiner = false;
+       bool dsc = false, bigjoiner = false, ultrajoiner = false;
        u16 dsc_max_compressed_bpp = 0;
        u8 dsc_slice_count = 0;
        int target_clock = mode->clock;
@@ -1431,9 +1435,12 @@ intel_dp_mst_mode_valid_ctx(struct drm_connector 
*connector,
         *   corresponding link capabilities of the sink) in case the
         *   stream is uncompressed for it by the last branch device.
         */
-       if (intel_dp_need_joiner(intel_dp, intel_connector,
-                                mode->hdisplay, target_clock)) {
-               joiner = true;
+       if (intel_dp_need_ultrajoiner(intel_dp, target_clock)) {
+               ultrajoiner = true;
+               max_dotclk *= 4;
+       } else if (intel_dp_need_bigjoiner(intel_dp, intel_connector,
+                                          mode->hdisplay, target_clock)) {
+               bigjoiner = true;
                max_dotclk *= 2;
        }
@@ -1461,20 +1468,22 @@ intel_dp_mst_mode_valid_ctx(struct drm_connector *connector,
                                                                    max_lanes,
                                                                    
target_clock,
                                                                    
mode->hdisplay,
-                                                                   joiner,
+                                                                   bigjoiner,
+                                                                   ultrajoiner,
                                                                    
INTEL_OUTPUT_FORMAT_RGB,
                                                                    pipe_bpp, 
64);
                        dsc_slice_count =
                                intel_dp_dsc_get_slice_count(intel_connector,
                                                             target_clock,
                                                             mode->hdisplay,
-                                                            joiner);
+                                                            bigjoiner,
+                                                            ultrajoiner);
                }
dsc = dsc_max_compressed_bpp && dsc_slice_count;
        }
- if (intel_dp_joiner_needs_dsc(dev_priv, joiner) && !dsc) {
+       if (intel_dp_joiner_needs_dsc(dev_priv, bigjoiner, ultrajoiner) && 
!dsc) {
                *status = MODE_CLOCK_HIGH;
                return 0;
        }
@@ -1484,7 +1493,7 @@ intel_dp_mst_mode_valid_ctx(struct drm_connector 
*connector,
                return 0;
        }
- *status = intel_mode_valid_max_plane_size(dev_priv, mode, joiner);
+       *status = intel_mode_valid_max_plane_size(dev_priv, mode, bigjoiner, 
ultrajoiner);
        return 0;
  }
diff --git a/drivers/gpu/drm/i915/display/intel_dsi.c b/drivers/gpu/drm/i915/display/intel_dsi.c
index bd5888ce4852..1a7e9a56fccd 100644
--- a/drivers/gpu/drm/i915/display/intel_dsi.c
+++ b/drivers/gpu/drm/i915/display/intel_dsi.c
@@ -76,7 +76,7 @@ enum drm_mode_status intel_dsi_mode_valid(struct 
drm_connector *connector,
        if (fixed_mode->clock > max_dotclk)
                return MODE_CLOCK_HIGH;
- return intel_mode_valid_max_plane_size(dev_priv, mode, false);
+       return intel_mode_valid_max_plane_size(dev_priv, mode, false, false);
  }
struct intel_dsi_host *intel_dsi_host_init(struct intel_dsi *intel_dsi,
diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c 
b/drivers/gpu/drm/i915/display/intel_hdmi.c
index 19498ee455fa..35be89050512 100644
--- a/drivers/gpu/drm/i915/display/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
@@ -2048,7 +2048,7 @@ intel_hdmi_mode_valid(struct drm_connector *connector,
                        return status;
        }
- return intel_mode_valid_max_plane_size(dev_priv, mode, false);
+       return intel_mode_valid_max_plane_size(dev_priv, mode, false, false);
  }
bool intel_hdmi_bpc_possible(const struct intel_crtc_state *crtc_state,
@@ -2341,6 +2341,18 @@ int intel_hdmi_compute_config(struct intel_encoder 
*encoder,
                return ret;
        }
+ if (adjusted_mode->crtc_clock > dev_priv->display.cdclk.max_dotclk_freq ||
+           pipe_config->joiner_pipes) {
+               if (pipe_config->dsc.slice_count < 2) {
+                       drm_dbg_kms(&dev_priv->drm,
+                                   "Cannot split stream to use 2 VDSC 
instances\n");
+                       return -EINVAL;
+               }
+
+               pipe_config->dsc.dsc_split = true;
+       }
+
+
        if (intel_hdmi_is_ycbcr420(pipe_config)) {
                ret = intel_panel_fitting(pipe_config, conn_state);
                if (ret)
diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.c 
b/drivers/gpu/drm/i915/display/intel_vdsc.c
index 11058bb37d5a..206b3e77e0d5 100644
--- a/drivers/gpu/drm/i915/display/intel_vdsc.c
+++ b/drivers/gpu/drm/i915/display/intel_vdsc.c
@@ -13,6 +13,7 @@
  #include "intel_crtc.h"
  #include "intel_de.h"
  #include "intel_display_types.h"
+#include "intel_dp.h"
  #include "intel_dsi.h"
  #include "intel_qp_tables.h"
  #include "intel_vdsc.h"
@@ -379,7 +380,9 @@ int intel_dsc_get_num_vdsc_instances(const struct 
intel_crtc_state *crtc_state)
  {
        int num_vdsc_instances = intel_dsc_get_vdsc_per_pipe(crtc_state);
- if (crtc_state->joiner_pipes)
+       if (intel_is_ultrajoiner(crtc_state))
+               num_vdsc_instances *= 4;
+       else if (intel_is_bigjoiner(crtc_state))
                num_vdsc_instances *= 2;
return num_vdsc_instances;
@@ -770,6 +773,13 @@ void intel_uncompressed_joiner_enable(const struct 
intel_crtc_state *crtc_state)
        }
  }
+static bool intel_crtc_ultrajoiner_enable_needed(const struct intel_crtc_state *crtc_state)
+{
+       struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+
+       return intel_is_ultrajoiner(crtc_state) && crtc->pipe != PIPE_D;
+}
+
  void intel_dsc_enable(const struct intel_crtc_state *crtc_state)
  {
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
@@ -788,8 +798,21 @@ void intel_dsc_enable(const struct intel_crtc_state 
*crtc_state)
                dss_ctl2_val |= RIGHT_BRANCH_VDSC_ENABLE;
                dss_ctl1_val |= JOINER_ENABLE;
        }
+
        if (crtc_state->joiner_pipes) {
+               /*
+                * This bit doesn't seem to follow master/slave logic or
+                * any other logic, so lets just add helper function to
+                * at least hide this hassle..
+                */
+               if (intel_crtc_ultrajoiner_enable_needed(crtc_state))
+                       dss_ctl1_val |= ULTRA_JOINER_ENABLE;
+
+               if (intel_crtc_is_ultrajoiner_primary(crtc_state))
+                       dss_ctl1_val |= PRIMARY_ULTRA_JOINER_ENABLE;;
+
                dss_ctl1_val |= BIG_JOINER_ENABLE;
+
                if (intel_crtc_is_bigjoiner_primary(crtc_state))
                        dss_ctl1_val |= PRIMARY_BIG_JOINER_ENABLE;
        }

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