From: Zeyu Fan <Zeyu.Fan@amd.com>
Date: Thu, 16 Feb 2017 16:15:30 -0500
Subject: drm/amd/display: Add query_ddc_data function
Git-commit: 2b230ea3e76f6238b31fd270cab76d55394f3293
Patch-mainline: v4.15-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Signed-off-by: Zeyu Fan <Zeyu.Fan@amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc.c |   25 +++++++++++++++++++++++++
 drivers/gpu/drm/amd/display/dc/dc.h      |   11 ++++++++++-
 2 files changed, 35 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -1725,6 +1725,31 @@ bool dc_read_dpcd(
 	return r == DDC_RESULT_SUCESSFULL;
 }
 
+bool dc_query_ddc_data(
+		struct dc *dc,
+		uint32_t link_index,
+		uint32_t address,
+		uint8_t *write_buf,
+		uint32_t write_size,
+		uint8_t *read_buf,
+		uint32_t read_size) {
+
+	struct core_dc *core_dc = DC_TO_CORE(dc);
+
+	struct core_link *link = core_dc->links[link_index];
+
+	bool result = dal_ddc_service_query_ddc_data(
+			link->ddc,
+			address,
+			write_buf,
+			write_size,
+			read_buf,
+			read_size);
+
+	return result;
+}
+
+
 bool dc_write_dpcd(
 		struct dc *dc,
 		uint32_t link_index,
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -720,7 +720,16 @@ bool dc_write_dpcd(
 		uint32_t link_index,
 		uint32_t address,
 		const uint8_t *data,
-	uint32_t size);
+		uint32_t size);
+
+bool dc_query_ddc_data(
+		struct dc *dc,
+		uint32_t link_index,
+		uint32_t address,
+		uint8_t *write_buf,
+		uint32_t write_size,
+		uint8_t *read_buf,
+		uint32_t read_size);
 
 bool dc_submit_i2c(
 		struct dc *dc,