1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_hti.c b/drivers/gpu/drm/i915/display/intel_hti.c
new file mode 100644
index 000000000000..c518efebdf77
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_hti.c
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+#include "i915_drv.h"
+#include "intel_de.h"
+#include "intel_display.h"
+#include "intel_hti.h"
+#include "intel_hti_regs.h"
+
+void intel_hti_init(struct drm_i915_private *i915)
+{
+	/*
+	 * If the platform has HTI, we need to find out whether it has reserved
+	 * any display resources before we create our display outputs.
+	 */
+	if (INTEL_INFO(i915)->display.has_hti)
+		i915->display.hti.state = intel_de_read(i915, HDPORT_STATE);
+}
+
+bool intel_hti_uses_phy(struct drm_i915_private *i915, enum phy phy)
+{
+	if (drm_WARN_ON(&i915->drm, phy == PHY_NONE))
+		return false;
+
+	return i915->display.hti.state & HDPORT_ENABLED &&
+		i915->display.hti.state & HDPORT_DDI_USED(phy);
+}
+
+u32 intel_hti_dpll_mask(struct drm_i915_private *i915)
+{
+	if (!(i915->display.hti.state & HDPORT_ENABLED))
+		return 0;
+
+	/*
+	 * Note: This is subtle. The values must coincide with what's defined
+	 * for the platform.
+	 */
+	return REG_FIELD_GET(HDPORT_DPLL_USED_MASK, i915->display.hti.state);
+}