Re: [7/8] drm/i915/dsc: Add debugfs entry to validate DSC fractional bpp

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Hi,


On 2023/9/13 14:06, Mitul Golani wrote:
From: Swati Sharma <swati2.sharma@xxxxxxxxx>

DSC_Sink_BPP_Precision entry is added to i915_dsc_fec_support_show
to depict sink's precision.
Also, new debugfs entry is created to enforce fractional bpp.
If Force_DSC_Fractional_BPP_en is set then while iterating over
output bpp with fractional step size we will continue if output_bpp is
computed as integer. With this approach, we will be able to validate
DSC with fractional bpp.

v2:
Add drm_modeset_unlock to new line(Suraj)

Signed-off-by: Swati Sharma <swati2.sharma@xxxxxxxxx>
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>
Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani@xxxxxxxxx>
Reviewed-by: Suraj Kandpal <suraj.kandpal@xxxxxxxxx>
---
  .../drm/i915/display/intel_display_debugfs.c  | 83 +++++++++++++++++++
  .../drm/i915/display/intel_display_types.h    |  1 +
  2 files changed, 84 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
index f05b52381a83..776ab96def1f 100644
--- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
+++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
@@ -1244,6 +1244,8 @@ static int i915_dsc_fec_support_show(struct seq_file *m, void *data)
  								      DP_DSC_YCbCr420_Native)),
  			   str_yes_no(drm_dp_dsc_sink_supports_format(intel_dp->dsc_dpcd,
  								      DP_DSC_YCbCr444)));
+		seq_printf(m, "DSC_Sink_BPP_Precision: %d\n",
+			   drm_dp_dsc_sink_bpp_incr(intel_dp->dsc_dpcd));
  		seq_printf(m, "Force_DSC_Enable: %s\n",
  			   str_yes_no(intel_dp->force_dsc_en));
  		if (!intel_dp_is_edp(intel_dp))
@@ -1436,6 +1438,84 @@ static const struct file_operations i915_dsc_output_format_fops = {
  	.write = i915_dsc_output_format_write
  };
+static int i915_dsc_fractional_bpp_show(struct seq_file *m, void *data)
+{
+	struct drm_connector *connector = m->private;
+	struct drm_device *dev = connector->dev;
+	struct drm_crtc *crtc;
+	struct intel_dp *intel_dp;
+	struct intel_encoder *encoder = intel_attached_encoder(to_intel_connector(connector));

The 'to_intel_connector()' inline function get used twice in this function,
if it were me, I will cache it with a local variable to prevent over long in horizontal.


        struct intel_connector *intel_connector = to_intel_connector(connector);
        struct intel_encoder *encoder = intel_attached_encoder(intel_connector);

+	int ret;
+
+	if (!encoder)
+		return -ENODEV;
+
+	ret = drm_modeset_lock_single_interruptible(&dev->mode_config.connection_mutex);
+	if (ret)
+		return ret;
+
+	crtc = connector->state->crtc;
+	if (connector->status != connector_status_connected || !crtc) {
+		ret = -ENODEV;
+		goto out;
+	}
+
+	intel_dp = intel_attached_dp(to_intel_connector(connector));


         intel_dp = intel_attached_dp(intel_connector);

But this patch is OK, I just give a suggestion.




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