[PATCH 07/28] drm/amd/display: Prepare for Fused I2C-over-AUX

[Ray Wu]

From: Dominik Kaszewski <dominik.kaszewski at amd.com>

[Why]
Passive DP-HDMI dongles use I2C-over-AUX protocol which is currently
not supported using HDCP Locality Check FW path.

[How]
Prepare code for switching to I2C-over-AUX protocol. Passive dongle
detection to be added in another commit.

Reviewed-by: Alvin Lee <alvin.lee2 at amd.com>
Signed-off-by: Dominik Kaszewski <dominik.kaszewski at amd.com>
Signed-off-by: Ray Wu <ray.wu at amd.com>
---
 drivers/gpu/drm/amd/display/dc/dc_fused_io.c    | 12 ++++++++----
 drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h |  3 ++-
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dc_fused_io.c b/drivers/gpu/drm/amd/display/dc/dc_fused_io.c
index fff41b0a0a5a..fee69642fb93 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_fused_io.c
+++ b/drivers/gpu/drm/amd/display/dc/dc_fused_io.c
@@ -11,7 +11,8 @@ static bool op_i2c_convert(
 		union dmub_rb_cmd *cmd,
 		const struct mod_hdcp_atomic_op_i2c *op,
 		enum dmub_cmd_fused_request_type type,
-		uint32_t ddc_line
+		uint32_t ddc_line,
+		bool over_aux
 )
 {
 	struct dmub_cmd_fused_request *req = &cmd->fused_io.request;
@@ -23,6 +24,7 @@ static bool op_i2c_convert(
 	req->type = type;
 	loc->is_aux = false;
 	loc->ddc_line = ddc_line;
+	loc->over_aux = over_aux;
 	loc->address = op->address;
 	loc->offset = op->offset;
 	loc->length = op->size;
@@ -100,11 +102,13 @@ bool dm_atomic_write_poll_read_i2c(
 	if (!link)
 		return false;
 
+	const bool over_aux = false;
 	const uint32_t ddc_line = link->ddc->ddc_pin->pin_data->en;
+
 	union dmub_rb_cmd commands[3] = { 0 };
-	const bool converted = op_i2c_convert(&commands[0], write, FUSED_REQUEST_WRITE, ddc_line)
-			&& op_i2c_convert(&commands[1], poll, FUSED_REQUEST_POLL, ddc_line)
-			&& op_i2c_convert(&commands[2], read, FUSED_REQUEST_READ, ddc_line);
+	const bool converted = op_i2c_convert(&commands[0], write, FUSED_REQUEST_WRITE, ddc_line, over_aux)
+			&& op_i2c_convert(&commands[1], poll, FUSED_REQUEST_POLL, ddc_line, over_aux)
+			&& op_i2c_convert(&commands[2], read, FUSED_REQUEST_READ, ddc_line, over_aux);
 
 	if (!converted)
 		return false;
diff --git a/drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h b/drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h
index b11cf41c2d51..3ae31449983a 100644
--- a/drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h
+++ b/drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h
@@ -5447,7 +5447,8 @@ struct dmub_cmd_fused_request {
 		struct dmub_cmd_fused_request_location_i2c {
 			uint8_t is_aux : 1;  // False
 			uint8_t ddc_line : 3;
-			uint8_t _reserved0 : 4;
+			uint8_t over_aux : 1;
+			uint8_t _reserved0 : 3;
 			uint8_t address;
 			uint8_t offset;
 			uint8_t length;
-- 
2.43.0