drm/i915/intel_dp: Add support for forcing ultrajoiner

Allow forcing ultrajoiner through debugfs.

v2: Minor refactoring of switch case logic. (Ville)

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240930163549.416410-14-ankit.k.nautiyal@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 5923bbc232be345922118a477823b654711110b3..11aff485d8faf6de1ed9fad1014af3895bf7f455 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
+++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
@@ -1331,6 +1331,7 @@ static ssize_t i915_joiner_write(struct file *file,
 {
        struct seq_file *m = file->private_data;
        struct intel_connector *connector = m->private;
+       struct drm_i915_private *i915 = to_i915(connector->base.dev);
        int force_joined_pipes = 0;
        int ret;
 
@@ -1347,6 +1348,13 @@ static ssize_t i915_joiner_write(struct file *file,
        case 2:
                connector->force_joined_pipes = force_joined_pipes;
                break;
+       case 4:
+               if (HAS_ULTRAJOINER(i915)) {
+                       connector->force_joined_pipes = force_joined_pipes;
+                       break;
+               }
+
+               fallthrough;
        default:
                return -EINVAL;
        }