[PATCH] drm/i915/dsc: Expose dsc sink max slice count via debugfs

[Swati Sharma <swati2.sharma@intel.com>]

Number of DSC slices can be shown in the DSC debugfs so that
test can take a call whether the configuration can support forcing
bigjoiner/ultrajoiner.

v2: used intel_dp_is_edp() as the parameter to
    drm_dp_dsc_sink_max_slice_count() (Jani N)

Reviewed-by: Nemesa Garg <nemesa.garg@intel.com> (v1)
Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/3387
Signed-off-by: Swati Sharma <swati2.sharma@intel.com>
---
 drivers/gpu/drm/i915/display/intel_display_debugfs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
index 3eb7565cd83c..a7c744654274 100644
--- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
+++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
@@ -1013,6 +1013,8 @@ static int i915_dsc_fec_support_show(struct seq_file *m, void *data)
 								      DP_DSC_YCbCr444)));
 		seq_printf(m, "DSC_Sink_BPP_Precision: %d\n",
 			   drm_dp_dsc_sink_bpp_incr(connector->dp.dsc_dpcd));
+		seq_printf(m, "DSC_Sink_Max_Slice_Count: %d\n",
+			   drm_dp_dsc_sink_max_slice_count((connector->dp.dsc_dpcd), intel_dp_is_edp(intel_dp)));
 		seq_printf(m, "Force_DSC_Enable: %s\n",
 			   str_yes_no(intel_dp->force_dsc_en));
 		if (!intel_dp_is_edp(intel_dp))
-- 
2.25.1