drm/amd/display: Support for DMUB AUX
authorJude Shih <shenshih@amd.com>
Tue, 20 Apr 2021 02:19:37 +0000 (10:19 +0800)
committerAlex Deucher <alexander.deucher@amd.com>
Mon, 10 May 2021 22:06:44 +0000 (18:06 -0400)
commit81927e2808be5adace93c2012d45d6938d3a7aa0
tree95f90e9a665f319d77ff5700d82870673bb47949
parent7f63d8a1ad37a481dba7e721c3510025bdb897d4
drm/amd/display: Support for DMUB AUX

[WHY]
To process AUX transactions with DMUB using inbox1 and outbox1 mail boxes.

[How]
1) Added inbox1 command DMUB_CMD__DP_AUX_ACCESS to issue AUX commands
   to DMUB in dc_process_dmub_aux_transfer_async(). DMUB processes AUX cmd
   with DCN and sends reply back in an outbox1 message triggering an
   outbox1 interrupt to driver.
2) In existing driver implementation, AUX commands are processed
   synchronously by configuring DCN reg. But in DMUB AUX, driver sends an
   inbox1 message and waits for a conditional variable (CV) which will be
   signaled by outbox1 ISR.
3) DM will retrieve Outbox1 message and send back reply to upper layer
   and complete the AUX command

Signed-off-by: Jude Shih <shenshih@amd.com>
Reviewed-by: Hanghong Ma <Hanghong.Ma@amd.com>
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Acked-by: Wayne Lin <Wayne.Lin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
13 files changed:
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.h
drivers/gpu/drm/amd/display/dc/Makefile
drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c
drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
drivers/gpu/drm/amd/display/dc/dce/dce_aux.h
drivers/gpu/drm/amd/display/dc/dm_helpers.h
drivers/gpu/drm/amd/display/dc/irq/dcn21/irq_service_dcn21.c
drivers/gpu/drm/amd/display/dc/irq_types.h