drm/amd/display: Request usb4 bw for mst streams

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[WHY]
When usb4 bandwidth allocation mode is enabled, driver need to request
bandwidth from connection manager. For mst link,  the requested
bandwidth should be big enough for all remote streams.

[HOW]
- If mst link, the requested bandwidth should be the sum of all mst
  streams bandwidth added with dp MTPH overhead.
- Allocate/deallcate usb4 bandwidth when setting dpms on/off.
- When doing display mode validation, driver also need to consider total
  bandwidth of all mst streams for mst link.

Reviewed-by: Cruise Hung <cruise.hung@amd.com>
Acked-by: Rodrigo Siqueira <rodrigo.siqueira@amd.com>
Signed-off-by: Peichen Huang <peichen.huang@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Peichen Huang 2023-12-14 23:16:34 +08:00 • committed by Alex Deucher

parent a465536ebf

commit 5f3bce1326

5 changed files with 144 additions and 38 deletions

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12

drivers/gpu/drm/amd/display/dc/dc_types.h

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42

drivers/gpu/drm/amd/display/dc/link/link_dpms.c

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60

drivers/gpu/drm/amd/display/dc/link/link_validation.c

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59

drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.c

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9

drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.h

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