bybrooklyn/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-04-25 18:12:26 -04:00
Code Issues Packages Projects Releases Wiki Activity

drm/amd/display: ACPI Re-timer Programming

Browse Source 
[Why]
We must implement an ACPI re-timer programming interface and notify
ACPI driver whenever a PHY transition is about to take place.

Because some trace lengths on certain platforms are very long,
then a re-timer may need to be programmed whenever a PHY transition
takes place. The implementation of this re-timer programming interface
will notify ACPI driver that PHY transition is taking place and it
will trigger the re-timer as needed.

First we need to gather retimer information from ACPI interface.

Then, in the PRE case, the re-timer interface needs to be called before we call
transmitter ENABLE.
In the POST case, it has to be called after we call transmitter DISABLE.

[How]
Implemented ACPI retimer programming interface.

Reviewed-by: Alvin Lee <alvin.lee2@amd.com>
Signed-off-by: Rafal Ostrowski <rostrows@amd.com>
Signed-off-by: Zaeem Mohamed <zaeem.mohamed@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Rafal Ostrowski
2025-02-12 08:08:07 +01:00
committed by Alex Deucher
parent 02a2793ab2
commit ab021b9f31
5 changed files with 89 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/gpu/drm/amd/display/dc/dm_services.h
View File

@@ -290,6 +290,13 @@ void dm_trace_smu_delay(uint32_t delay, struct dc_context *ctx);
bool dm_execute_dmub_cmd(const struct dc_context *ctx, union dmub_rb_cmd *cmd, enum dm_dmub_wait_type wait_type);
bool dm_execute_dmub_cmd_list(const struct dc_context *ctx, unsigned int count, union dmub_rb_cmd *cmd, enum dm_dmub_wait_type wait_type);
/*
* ACPI Interfaces
*/
void dm_acpi_process_phy_transition_interlock(
const struct dc_context *ctx,
struct dm_process_phy_transition_init_params process_phy_transition_init_params);
/*
* Debug and verification hooks
*/