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drm/amd/display: Prepare for Fused I2C-over-AUX

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[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@amd.com>
Signed-off-by: Dominik Kaszewski <dominik.kaszewski@amd.com>
Signed-off-by: Ray Wu <ray.wu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Dominik Kaszewski
2025-05-05 12:55:30 -04:00
committed by Alex Deucher
parent bd3e84bc98
commit 2f2c97089d
2 changed files with 10 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/gpu/drm/amd/display/dc/dc_fused_io.c
+8 -4
View File
@@ -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;
drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h
+2 -1
View File
@@ -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;