drm/i915/display/debug: Expose crtc current bpc via debugfs

This new debugfs will expose the currently using bpc by crtc.
It is very useful for verifying whether we enter the correct
output color depth from IGT.

This patch will also add the connector's max supported bpc to
"i915_display_info" debugfs.

Example:
cat /sys/kernel/debug/dri/0/crtc-0/i915_current_bpc
Current: 8

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Bhanuprakash Modem <bhanuprakash.modem@intel.com>
Reviewed-by: Arun R Murthy <arun.r.murthy@intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220519095149.3560034-3-bhanuprakash.modem@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
index 452d773fd4e34121b990a75b527f1797a0b608c2..6c3954479047520f587b2a6a0d8dd54cd63ec0df 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
+++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
@@ -590,6 +590,8 @@ static void intel_connector_info(struct seq_file *m,
        seq_puts(m, "\tHDCP version: ");
        intel_hdcp_info(m, intel_connector);
 
+       seq_printf(m, "\tmax bpc: %u\n", connector->display_info.bpc);
+
        intel_panel_info(m, intel_connector);
 
        seq_printf(m, "\tmodes:\n");
@@ -2202,6 +2204,29 @@ static const struct file_operations i915_dsc_bpp_fops = {
        .write = i915_dsc_bpp_write
 };
 
+/*
+ * Returns the Current CRTC's bpc.
+ * Example usage: cat /sys/kernel/debug/dri/0/crtc-0/i915_current_bpc
+ */
+static int i915_current_bpc_show(struct seq_file *m, void *data)
+{
+       struct intel_crtc *crtc = to_intel_crtc(m->private);
+       struct intel_crtc_state *crtc_state;
+       int ret;
+
+       ret = drm_modeset_lock_single_interruptible(&crtc->base.mutex);
+       if (ret)
+               return ret;
+
+       crtc_state = to_intel_crtc_state(crtc->base.state);
+       seq_printf(m, "Current: %u\n", crtc_state->pipe_bpp / 3);
+
+       drm_modeset_unlock(&crtc->base.mutex);
+
+       return ret;
+}
+DEFINE_SHOW_ATTRIBUTE(i915_current_bpc);
+
 /**
  * intel_connector_debugfs_add - add i915 specific connector debugfs files
  * @connector: pointer to a registered drm_connector
@@ -2272,4 +2297,7 @@ void intel_crtc_debugfs_add(struct drm_crtc *crtc)
 
        crtc_updates_add(crtc);
        intel_fbc_crtc_debugfs_add(to_intel_crtc(crtc));
+
+       debugfs_create_file("i915_current_bpc", 0444, crtc->debugfs_entry, crtc,
+                           &i915_current_bpc_fops);
 }