drm/amd/display: take max dsc stream bandwidth overhead into account

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[why]
As hardware team suggested that we need to add a max dsc bw overhead
into existing stream bandwidth when DSC is used.
The formula as below:

max_dsc_bw_overhead =
v_addressable * slice_count * 256 bit * pixel clock / v_total / h_total

effective stream bandwidth = pixel clock * bpp

stream bandwidth = effective stream bandwidth + dsc stream overhead

Signed-off-by: Wenjing Liu <wenjing.liu@amd.com>
Reviewed-by: Eric Bernstein <Eric.Bernstein@amd.com>
Acked-by: Wayne Lin <waynelin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Wenjing Liu 2021-04-09 14:55:18 -04:00 • committed by Alex Deucher

parent abf1f863e0

commit 642d3a2bf2

5 changed files with 94 additions and 76 deletions

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7

drivers/gpu/drm/amd/display/dc/core/dc_link.c

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5

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

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113

drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c

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43

drivers/gpu/drm/amd/display/dc/dsc/rc_calc.c

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2

drivers/gpu/drm/amd/display/dc/dsc/rc_calc.h

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