[PATCH 13/13] drm/i915/intel_dp: Add support for forcing ultrajoiner

[Ankit Nautiyal]

Allow forcing ultrajoiner through debugfs.

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

Signed-off-by: Ankit Nautiyal <ankit.k.nauti...@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kand...@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_display_debugfs.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c 
b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
index 5923bbc232be..11aff485d8fa 100644
--- 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;
        }
-- 
2.45.2