[PATCH 19/19] drm/i915/intel_dp: Add support for forcing ultrajoiner

[Ankit Nautiyal]

Allow forcing ultrajoiner through debugfs.

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal at intel.com>
---
 drivers/gpu/drm/i915/display/intel_display_debugfs.c | 6 ++++++
 drivers/gpu/drm/i915/display/intel_dp.c              | 2 ++
 2 files 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 cb539c6b097a..db43214fce02 100644
--- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
+++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
@@ -1554,6 +1554,12 @@ static ssize_t i915_joiner_write(struct file *file,
 		else
 			drm_dbg(display->drm, "Force joiner not supported for the config\n");
 		break;
+	case 4:
+		if (intel_display_can_use_ultrajoiner(display))
+			connector->force_joined_pipes = force_join_pipes;
+		else
+			drm_dbg(display->drm, "Force ultrajoiner not supported for the config\n");
+		break;
 	default:
 		drm_dbg(display->drm, "Ignoring Invalid num of pipes %d for force joining\n",
 			force_join_pipes);
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 2cba62539081..da3cfd0f5fef 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -1317,6 +1317,8 @@ int intel_dp_compute_joiner_pipes(struct intel_dp *intel_dp,
 	case 1:
 		fallthrough;
 	case 2:
+		fallthrough;
+	case 4:
 		return connector->force_joined_pipes;
 	default:
 		MISSING_CASE(connector->force_joined_pipes);
-- 
2.45.2