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drm/amd/display: Add support for 6.75 GBps link rate

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[Why]
The latest eDP spec version 1.5 defines a new generic link
rate of 6.75 Gbps/Lane, which needs to be supported in the driver.

[How]
Added new element to the dc_link_rate enum

Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Artem Grishin <Artem.Grishin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Artem Grishin 2023-03-14 16:11:39 -04:00 committed by Alex Deucher
parent 37403ced9f
commit a78d43738e
3 changed files with 16 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/gpu/drm/amd/display/dc/dc_dp_types.h
View File

@ -47,14 +47,15 @@ enum dc_lane_count {
*/
enum dc_link_rate {
LINK_RATE_UNKNOWN = 0,
LINK_RATE_LOW = 0x06, // Rate_1 (RBR) - 1.62 Gbps/Lane
LINK_RATE_RATE_2 = 0x08, // Rate_2 - 2.16 Gbps/Lane
LINK_RATE_RATE_3 = 0x09, // Rate_3 - 2.43 Gbps/Lane
LINK_RATE_HIGH = 0x0A, // Rate_4 (HBR) - 2.70 Gbps/Lane
LINK_RATE_RBR2 = 0x0C, // Rate_5 (RBR2)- 3.24 Gbps/Lane
LINK_RATE_RATE_6 = 0x10, // Rate_6 - 4.32 Gbps/Lane
LINK_RATE_HIGH2 = 0x14, // Rate_7 (HBR2)- 5.40 Gbps/Lane
LINK_RATE_HIGH3 = 0x1E, // Rate_8 (HBR3)- 8.10 Gbps/Lane
LINK_RATE_LOW = 0x06, // Rate_1 (RBR) - 1.62 Gbps/Lane
LINK_RATE_RATE_2 = 0x08, // Rate_2 - 2.16 Gbps/Lane
LINK_RATE_RATE_3 = 0x09, // Rate_3 - 2.43 Gbps/Lane
LINK_RATE_HIGH = 0x0A, // Rate_4 (HBR) - 2.70 Gbps/Lane
LINK_RATE_RBR2 = 0x0C, // Rate_5 (RBR2) - 3.24 Gbps/Lane
LINK_RATE_RATE_6 = 0x10, // Rate_6 - 4.32 Gbps/Lane
LINK_RATE_HIGH2 = 0x14, // Rate_7 (HBR2) - 5.40 Gbps/Lane
LINK_RATE_RATE_8 = 0x19, // Rate_8 - 6.75 Gbps/Lane
LINK_RATE_HIGH3 = 0x1E, // Rate_9 (HBR3) - 8.10 Gbps/Lane
/* Starting from DP2.0 link rate enum directly represents actual
* link rate value in unit of 10 mbps
*/

5
drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
View File

@ -203,8 +203,11 @@ static enum dc_link_rate linkRateInKHzToLinkRateMultiplier(uint32_t link_rate_in
case 5400000:
link_rate = LINK_RATE_HIGH2; // Rate_7 (HBR2)- 5.40 Gbps/Lane
break;
case 6750000:
link_rate = LINK_RATE_RATE_8; // Rate_8 - 6.75 Gbps/Lane
break;
case 8100000:
link_rate = LINK_RATE_HIGH3; // Rate_8 (HBR3)- 8.10 Gbps/Lane
link_rate = LINK_RATE_HIGH3; // Rate_9 (HBR3)- 8.10 Gbps/Lane
break;
default:
link_rate = LINK_RATE_UNKNOWN;

3
drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c
View File

@ -86,6 +86,9 @@ void dp_log_training_result(
case LINK_RATE_HIGH2:
link_rate = "HBR2";
break;
case LINK_RATE_RATE_8:
link_rate = "R8";
break;
case LINK_RATE_HIGH3:
link_rate = "HBR3";
break;