From: Swati Sharma <swati2.sha...@intel.com>

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.

Signed-off-by: Swati Sharma <swati2.sha...@intel.com>
Signed-off-by: Ankit Nautiyal <ankit.k.nauti...@intel.com>
---
 .../drm/i915/display/intel_display_debugfs.c  | 84 +++++++++++++++++++
 .../drm/i915/display/intel_display_types.h    |  1 +
 2 files changed, 85 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c 
b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
index 7bcd90384a46..2b36ec812293 100644
--- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
+++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
@@ -1772,6 +1772,8 @@ static int i915_dsc_fec_support_show(struct seq_file *m, 
void *data)
                           
str_yes_no(drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)));
                seq_printf(m, "Force_DSC_Enable: %s\n",
                           str_yes_no(intel_dp->force_dsc_en));
+               seq_printf(m, "DSC_Sink_BPP_Precision: %d\n",
+                          drm_dp_dsc_sink_bpp_incr(intel_dp->dsc_dpcd));
                if (!intel_dp_is_edp(intel_dp))
                        seq_printf(m, "FEC_Sink_Support: %s\n",
                                   
str_yes_no(drm_dp_sink_supports_fec(intel_dp->fec_capable)));
@@ -1895,6 +1897,85 @@ static const struct file_operations i915_dsc_bpc_fops = {
        .write = i915_dsc_bpc_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_crtc_state *crtc_state;
+       struct intel_encoder *encoder = 
intel_attached_encoder(to_intel_connector(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));
+       crtc_state = to_intel_crtc_state(crtc->state);
+       seq_printf(m, "Force_DSC_Fractional_BPP_Enable: %s\n",
+                  str_yes_no(intel_dp->force_dsc_fractional_bpp_en));
+
+out:   drm_modeset_unlock(&dev->mode_config.connection_mutex);
+
+       return ret;
+}
+
+static ssize_t i915_dsc_fractional_bpp_write(struct file *file,
+                                            const char __user *ubuf,
+                                            size_t len, loff_t *offp)
+{
+       struct drm_connector *connector =
+               ((struct seq_file *)file->private_data)->private;
+       struct intel_encoder *encoder = 
intel_attached_encoder(to_intel_connector(connector));
+       struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+       struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+       bool dsc_fractional_bpp_enable = false;
+       int ret;
+
+       if (len == 0)
+               return 0;
+
+       drm_dbg(&i915->drm,
+               "Copied %zu bytes from user to force fractional bpp for DSC\n", 
len);
+
+       ret = kstrtobool_from_user(ubuf, len, &dsc_fractional_bpp_enable);
+       if (ret < 0)
+               return ret;
+
+       drm_dbg(&i915->drm, "Got %s for DSC Fractional BPP Enable\n",
+               (dsc_fractional_bpp_enable) ? "true" : "false");
+       intel_dp->force_dsc_fractional_bpp_en = dsc_fractional_bpp_enable;
+
+       *offp += len;
+
+       return len;
+}
+
+static int i915_dsc_fractional_bpp_open(struct inode *inode,
+                                       struct file *file)
+{
+       return single_open(file, i915_dsc_fractional_bpp_show, 
inode->i_private);
+}
+
+static const struct file_operations i915_dsc_fractional_bpp_fops = {
+       .owner = THIS_MODULE,
+       .open = i915_dsc_fractional_bpp_open,
+       .read = seq_read,
+       .llseek = seq_lseek,
+       .release = single_release,
+       .write = i915_dsc_fractional_bpp_write
+};
+
 /*
  * Returns the Current CRTC's bpc.
  * Example usage: cat /sys/kernel/debug/dri/0/crtc-0/i915_current_bpc
@@ -1966,6 +2047,9 @@ void intel_connector_debugfs_add(struct intel_connector 
*intel_connector)
 
                debugfs_create_file("i915_dsc_bpc", 0644, root,
                                    connector, &i915_dsc_bpc_fops);
+
+               debugfs_create_file("i915_dsc_fractional_bpp", 0644, root,
+                                   connector, &i915_dsc_fractional_bpp_fops);
        }
 
        if (connector->connector_type == DRM_MODE_CONNECTOR_DSI ||
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h 
b/drivers/gpu/drm/i915/display/intel_display_types.h
index e879a9483148..1c5930d78749 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1737,6 +1737,7 @@ struct intel_dp {
 
        /* Display stream compression testing */
        bool force_dsc_en;
+       bool force_dsc_fractional_bpp_en;
        int force_dsc_bpc;
 
        bool hobl_failed;
-- 
2.25.1

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