drm/amd/display: Refactor SST DSC Determination Policy

[Why & How]
SST dsc determination policy becomes bigger when more scenarios
are introduced. Take it out to make it clean and readable.

Signed-off-by: Fangzhi Zuo <Jerry.Zuo@amd.com>
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index f5cc28b..91f2087 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -5538,6 +5538,65 @@ static void dm_enable_per_frame_crtc_master_sync(struct dc_state *context)
        }
 }
 
+static void update_dsc_caps(struct amdgpu_dm_connector *aconnector,
+                                                       struct dc_sink *sink, struct dc_stream_state *stream,
+                                                       struct dsc_dec_dpcd_caps *dsc_caps)
+{
+       stream->timing.flags.DSC = 0;
+
+       if (aconnector->dc_link && sink->sink_signal == SIGNAL_TYPE_DISPLAY_PORT) {
+#if defined(CONFIG_DRM_AMD_DC_DCN)
+               dc_dsc_parse_dsc_dpcd(aconnector->dc_link->ctx->dc,
+                                     aconnector->dc_link->dpcd_caps.dsc_caps.dsc_basic_caps.raw,
+                                     aconnector->dc_link->dpcd_caps.dsc_caps.dsc_branch_decoder_caps.raw,
+                                     dsc_caps);
+#endif
+       }
+}
+
+static void apply_dsc_policy_for_stream(struct amdgpu_dm_connector *aconnector,
+                                                                               struct dc_sink *sink, struct dc_stream_state *stream,
+                                                                               struct dsc_dec_dpcd_caps *dsc_caps)
+{
+       struct drm_connector *drm_connector = &aconnector->base;
+       uint32_t link_bandwidth_kbps;
+
+       link_bandwidth_kbps = dc_link_bandwidth_kbps(aconnector->dc_link,
+                                                       dc_link_get_link_cap(aconnector->dc_link));
+#if defined(CONFIG_DRM_AMD_DC_DCN)
+       /* Set DSC policy according to dsc_clock_en */
+       dc_dsc_policy_set_enable_dsc_when_not_needed(
+               aconnector->dsc_settings.dsc_force_enable == DSC_CLK_FORCE_ENABLE);
+
+       if (aconnector->dc_link && sink->sink_signal == SIGNAL_TYPE_DISPLAY_PORT) {
+
+               if (dc_dsc_compute_config(aconnector->dc_link->ctx->dc->res_pool->dscs[0],
+                                               dsc_caps,
+                                               aconnector->dc_link->ctx->dc->debug.dsc_min_slice_height_override,
+                                               0,
+                                               link_bandwidth_kbps,
+                                               &stream->timing,
+                                               &stream->timing.dsc_cfg)) {
+                       stream->timing.flags.DSC = 1;
+                       DRM_DEBUG_DRIVER("%s: [%s] DSC is selected from SST RX\n", __func__, drm_connector->name);
+               }
+       }
+
+       /* Overwrite the stream flag if DSC is enabled through debugfs */
+       if (aconnector->dsc_settings.dsc_force_enable == DSC_CLK_FORCE_ENABLE)
+               stream->timing.flags.DSC = 1;
+
+       if (stream->timing.flags.DSC && aconnector->dsc_settings.dsc_num_slices_h)
+               stream->timing.dsc_cfg.num_slices_h = aconnector->dsc_settings.dsc_num_slices_h;
+
+       if (stream->timing.flags.DSC && aconnector->dsc_settings.dsc_num_slices_v)
+               stream->timing.dsc_cfg.num_slices_v = aconnector->dsc_settings.dsc_num_slices_v;
+
+       if (stream->timing.flags.DSC && aconnector->dsc_settings.dsc_bits_per_pixel)
+               stream->timing.dsc_cfg.bits_per_pixel = aconnector->dsc_settings.dsc_bits_per_pixel;
+#endif
+}
+
 static struct drm_display_mode *
 get_highest_refresh_rate_mode(struct amdgpu_dm_connector *aconnector,
                          bool use_probed_modes)
@@ -5640,7 +5699,6 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
        int preferred_refresh = 0;
 #if defined(CONFIG_DRM_AMD_DC_DCN)
        struct dsc_dec_dpcd_caps dsc_caps;
-       uint32_t link_bandwidth_kbps;
 #endif
        struct dc_sink *sink = NULL;
 
@@ -5730,47 +5788,12 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
                        stream, &mode, &aconnector->base, con_state, old_stream,
                        requested_bpc);
 
-       stream->timing.flags.DSC = 0;
-
-       if (aconnector->dc_link && sink->sink_signal == SIGNAL_TYPE_DISPLAY_PORT) {
 #if defined(CONFIG_DRM_AMD_DC_DCN)
-               dc_dsc_parse_dsc_dpcd(aconnector->dc_link->ctx->dc,
-                                     aconnector->dc_link->dpcd_caps.dsc_caps.dsc_basic_caps.raw,
-                                     aconnector->dc_link->dpcd_caps.dsc_caps.dsc_branch_decoder_caps.raw,
-                                     &dsc_caps);
-               link_bandwidth_kbps = dc_link_bandwidth_kbps(aconnector->dc_link,
-                                                            dc_link_get_link_cap(aconnector->dc_link));
-
-               if (aconnector->dsc_settings.dsc_force_enable != DSC_CLK_FORCE_DISABLE && dsc_caps.is_dsc_supported) {
-                       /* Set DSC policy according to dsc_clock_en */
-                       dc_dsc_policy_set_enable_dsc_when_not_needed(
-                               aconnector->dsc_settings.dsc_force_enable == DSC_CLK_FORCE_ENABLE);
-
-                       if (dc_dsc_compute_config(aconnector->dc_link->ctx->dc->res_pool->dscs[0],
-                                                 &dsc_caps,
-                                                 aconnector->dc_link->ctx->dc->debug.dsc_min_slice_height_override,
-                                                 0,
-                                                 link_bandwidth_kbps,
-                                                 &stream->timing,
-                                                 &stream->timing.dsc_cfg)) {
-                               stream->timing.flags.DSC = 1;
-                               DRM_DEBUG_DRIVER("%s: [%s] DSC is selected from SST RX\n", __func__, drm_connector->name);
-                       }
-                       /* Overwrite the stream flag if DSC is enabled through debugfs */
-                       if (aconnector->dsc_settings.dsc_force_enable == DSC_CLK_FORCE_ENABLE)
-                               stream->timing.flags.DSC = 1;
-
-                       if (stream->timing.flags.DSC && aconnector->dsc_settings.dsc_num_slices_h)
-                               stream->timing.dsc_cfg.num_slices_h = aconnector->dsc_settings.dsc_num_slices_h;
-
-                       if (stream->timing.flags.DSC && aconnector->dsc_settings.dsc_num_slices_v)
-                               stream->timing.dsc_cfg.num_slices_v = aconnector->dsc_settings.dsc_num_slices_v;
-
-                       if (stream->timing.flags.DSC && aconnector->dsc_settings.dsc_bits_per_pixel)
-                               stream->timing.dsc_cfg.bits_per_pixel = aconnector->dsc_settings.dsc_bits_per_pixel;
-               }
+       /* SST DSC determination policy */
+       update_dsc_caps(aconnector, sink, stream, &dsc_caps);
+       if (aconnector->dsc_settings.dsc_force_enable != DSC_CLK_FORCE_DISABLE && dsc_caps.is_dsc_supported)
+               apply_dsc_policy_for_stream(aconnector, sink, stream, &dsc_caps);
 #endif
-       }
 
        update_stream_scaling_settings(&mode, dm_state, stream);