drm/i915/dsc: Add debugfs entry to validate DSC output formats

DSC_Output_Format_Sink_Support entry is added to i915_dsc_fec_support_show
to depict if sink supports DSC output formats (RGB/YCbCr420/YCbCr444).
Also, new debugfs entry is created to enforce output format. This is
required because of our driver policy. For ex. if a mode is supported
in both RGB and YCbCr420 output formats by the sink, our policy is to
try RGB first and fall back to YCbCr420, if mode cannot be shown
using RGB. So, to test other output formats like YCbCr420 or YCbCr444,
we need a debugfs entry (force_dsc_output_format) to force this
output format.

v2: -Func name changed to intel_output_format_name() (Jani N)
    -Return forced o/p format from intel_dp_output_format() (Jani N)
v3: -output_format_str[] to remain static (Jani N)

Signed-off-by: Swati Sharma <swati2.sharma@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230309062855.393087-8-suraj.kandpal@intel.com

1 files changed, 78 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
index d5715ccc37f0e..bad29cdd139df 100644
--- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
+++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
@@ -13,6 +13,7 @@
 #include "i915_irq.h"
 #include "i915_reg.h"
 #include "intel_de.h"
+#include "intel_crtc_state_dump.h"
 #include "intel_display_debugfs.h"
 #include "intel_display_power.h"
 #include "intel_display_power_well.h"
@@ -1234,6 +1235,13 @@ static int i915_dsc_fec_support_show(struct seq_file *m, void *data)
 			   str_yes_no(crtc_state->dsc.compression_enable));
 		seq_printf(m, "DSC_Sink_Support: %s\n",
 			   str_yes_no(drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)));
+		seq_printf(m, "DSC_Output_Format_Sink_Support: RGB: %s YCBCR420: %s YCBCR444: %s\n",
+			   str_yes_no(drm_dp_dsc_sink_supports_format(intel_dp->dsc_dpcd,
+								      DP_DSC_RGB)),
+			   str_yes_no(drm_dp_dsc_sink_supports_format(intel_dp->dsc_dpcd,
+								      DP_DSC_YCbCr420_Native)),
+			   str_yes_no(drm_dp_dsc_sink_supports_format(intel_dp->dsc_dpcd,
+								      DP_DSC_YCbCr444)));
 		seq_printf(m, "Force_DSC_Enable: %s\n",
 			   str_yes_no(intel_dp->force_dsc_en));
 		if (!intel_dp_is_edp(intel_dp))
@@ -1359,6 +1367,73 @@ static const struct file_operations i915_dsc_bpc_fops = {
 	.write = i915_dsc_bpc_write
 };
 
+static int i915_dsc_output_format_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_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;
+	}
+
+	crtc_state = to_intel_crtc_state(crtc->state);
+	seq_printf(m, "DSC_Output_Format: %s\n",
+		   intel_output_format_name(crtc_state->output_format));
+
+out:	drm_modeset_unlock(&dev->mode_config.connection_mutex);
+
+	return ret;
+}
+
+static ssize_t i915_dsc_output_format_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 intel_dp *intel_dp = enc_to_intel_dp(encoder);
+	int dsc_output_format = 0;
+	int ret;
+
+	ret = kstrtoint_from_user(ubuf, len, 0, &dsc_output_format);
+	if (ret < 0)
+		return ret;
+
+	intel_dp->force_dsc_output_format = dsc_output_format;
+	*offp += len;
+
+	return len;
+}
+
+static int i915_dsc_output_format_open(struct inode *inode,
+				       struct file *file)
+{
+	return single_open(file, i915_dsc_output_format_show, inode->i_private);
+}
+
+static const struct file_operations i915_dsc_output_format_fops = {
+	.owner = THIS_MODULE,
+	.open = i915_dsc_output_format_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+	.write = i915_dsc_output_format_write
+};
+
 /*
  * Returns the Current CRTC's bpc.
  * Example usage: cat /sys/kernel/debug/dri/0/crtc-0/i915_current_bpc
@@ -1433,6 +1508,9 @@ 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_output_format", 0644, root,
+				    connector, &i915_dsc_output_format_fops);
 	}
 
 	if (connector->connector_type == DRM_MODE_CONNECTOR_DSI ||