1 files changed, 83 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_i2c.c b/drivers/gpu/drm/amd/display/dc/dce/dce_i2c.c
new file mode 100644
index 0000000000..f5cd2392fc
--- /dev/null
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_i2c.c
@@ -0,0 +1,83 @@
+/*
+ * Copyright 2018 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: AMD
+ *
+ */
+#include "dce_i2c.h"
+#include "reg_helper.h"
+
+bool dce_i2c_oem_device_present(
+	struct resource_pool *pool,
+	struct ddc_service *ddc,
+	size_t slave_address
+)
+{
+	struct dc *dc = ddc->ctx->dc;
+	struct dc_bios *dcb = dc->ctx->dc_bios;
+	struct graphics_object_id id = {0};
+	struct graphics_object_i2c_info i2c_info;
+
+	if (!dc->ctx->dc_bios->fw_info.oem_i2c_present)
+		return false;
+
+	id.id = dc->ctx->dc_bios->fw_info.oem_i2c_obj_id;
+	id.enum_id = 0;
+	id.type = OBJECT_TYPE_GENERIC;
+	if (dcb->funcs->get_i2c_info(dcb, id, &i2c_info) != BP_RESULT_OK)
+		return false;
+
+	if (i2c_info.i2c_slave_address != slave_address)
+		return false;
+
+	return true;
+}
+
+bool dce_i2c_submit_command(
+	struct resource_pool *pool,
+	struct ddc *ddc,
+	struct i2c_command *cmd)
+{
+	struct dce_i2c_hw *dce_i2c_hw;
+	struct dce_i2c_sw dce_i2c_sw = {0};
+
+	if (!ddc) {
+		BREAK_TO_DEBUGGER();
+		return false;
+	}
+
+	if (!cmd) {
+		BREAK_TO_DEBUGGER();
+		return false;
+	}
+
+	dce_i2c_hw = acquire_i2c_hw_engine(pool, ddc);
+
+	if (dce_i2c_hw)
+		return dce_i2c_submit_command_hw(pool, ddc, cmd, dce_i2c_hw);
+
+	dce_i2c_sw.ctx = ddc->ctx;
+	if (dce_i2c_engine_acquire_sw(&dce_i2c_sw, ddc)) {
+		return dce_i2c_submit_command_sw(pool, ddc, cmd, &dce_i2c_sw);
+	}
+
+	return false;
+}