drm/amd/display: config to override DSC start slice height

[why]
It's sometimes useful to have this option when debugging

[how]
Add a config flag. If the flag is not set, use driver default policy.
If the flag is set, use the value from the flag as the starting DSC slice
height.

Signed-off-by: Nikola Cornij <nikola.cornij@amd.com>
Reviewed-by: Martin Leung <Martin.Leung@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index a82352a..1df1d7b 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -347,6 +347,7 @@ struct dc_debug_options {
        bool disable_hubp_power_gate;
 #ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
        bool disable_dsc_power_gate;
+       int dsc_min_slice_height_override;
 #endif
        bool disable_pplib_wm_range;
        enum wm_report_mode pplib_wm_report_mode;

diff --git a/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c b/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c
index 5995bcd..929ebd4 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c
+++ b/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c
@@ -512,6 +512,7 @@ static bool setup_dsc_config(
                const struct dsc_enc_caps *dsc_enc_caps,
                int target_bandwidth_kbps,
                const struct dc_crtc_timing *timing,
+               int min_slice_height_override,
                struct dc_dsc_config *dsc_cfg)
 {
        struct dsc_enc_caps dsc_common_caps;
@@ -680,7 +681,10 @@ static bool setup_dsc_config(
 
        // Slice height (i.e. number of slices per column): start with policy and pick the first one that height is divisible by.
        // For 4:2:0 make sure the slice height is divisible by 2 as well.
-       slice_height = min(dsc_policy.min_sice_height, pic_height);
+       if (min_slice_height_override == 0)
+               slice_height = min(dsc_policy.min_sice_height, pic_height);
+       else
+               slice_height = min(min_slice_height_override, pic_height);
 
        while (slice_height < pic_height && (pic_height % slice_height != 0 ||
                (timing->pixel_encoding == PIXEL_ENCODING_YCBCR420 && slice_height % 2 != 0)))
@@ -820,10 +824,8 @@ bool dc_dsc_compute_bandwidth_range(
                        timing->pixel_encoding, &dsc_common_caps);
 
        if (is_dsc_possible)
-               is_dsc_possible = setup_dsc_config(dsc_sink_caps,
-                               &dsc_enc_caps,
-                               0,
-                               timing, &config);
+               is_dsc_possible = setup_dsc_config(dsc_sink_caps, &dsc_enc_caps, 0, timing,
+                                       dc->debug.dsc_min_slice_height_override, &config);
 
        if (is_dsc_possible)
                get_dsc_bandwidth_range(min_bpp, max_bpp, &dsc_common_caps, timing, range);
@@ -845,7 +847,7 @@ bool dc_dsc_compute_config(
        is_dsc_possible = setup_dsc_config(dsc_sink_caps,
                        &dsc_enc_caps,
                        target_bandwidth_kbps,
-                       timing, dsc_cfg);
+                       timing, dc->debug.dsc_min_slice_height_override, dsc_cfg);
        return is_dsc_possible;
 }
 #endif /* CONFIG_DRM_AMD_DC_DSC_SUPPORT */