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drm/amd/display: Re-enable multi-dwb support

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[WHY&HOW]
DCN5+ supports multi-dwb per stream.

Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Signed-off-by: Dillon Varone <Dillon.Varone@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Dillon Varone 2026-08-12 15:36:31 -04:00 committed by Alex Deucher
parent 86cc88af18
commit 61ba35abd8
3 changed files with 2 additions and 11 deletions
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4
drivers/gpu/drm/amd/display/dc/dml2_0/dml21/src/dml2_core/dml2_core_dcn5_calcs_dchub.c
View File

@ -4225,9 +4225,9 @@ static double dcn5_calculate_writeback_latency_hiding_us(
unsigned int dwb_index)
{
double byte_per_pixel_luma_in_buffer = 1.0;
double buffer_for_luma_bytes = (double)writeback_buffer_size_bytes * 1024.0;
double buffer_for_luma_bytes = (double)writeback_buffer_size_bytes;
double line_time_us = (double)display_cfg->stream_descriptors[stream_index].timing.h_total /
(double)display_cfg->stream_descriptors[stream_index].timing.pixel_clock_khz / 1000.0;
((double)display_cfg->stream_descriptors[stream_index].timing.pixel_clock_khz / 1000.0);
if (display_cfg->stream_descriptors[stream_index].writeback.writeback_stream[dwb_index].pixel_format == dml2_444_64) {
byte_per_pixel_luma_in_buffer = 8.0;

5
drivers/gpu/drm/amd/display/dc/dml2_0/dml21/src/dml2_core/dml2_core_dcn5_funcs_mode_support.c
View File

@ -992,11 +992,6 @@ static bool dcn5_ms_check_writeback_count_support(
for (stream_idx = 0; stream_idx < display_cfg->num_streams; stream_idx++) {
totalNumberOfActiveWriteback +=
display_cfg->stream_descriptors[stream_idx].writeback.active_writebacks_per_stream;
/* >1 writeback per stream is currently not supported */
if (display_cfg->stream_descriptors[stream_idx].writeback.active_writebacks_per_stream > 1) {
writeback_per_stream_supported = false;
}
}
return writeback_per_stream_supported &&

4
drivers/gpu/drm/amd/display/dc/dml2_0/dml21/src/dml2_core/dml2_core_dcn6_funcs_mode_support.c
View File

@ -1292,10 +1292,6 @@ static bool dcn6_ms_check_writeback_count_support(
totalNumberOfActiveWriteback +=
display_cfg->stream_descriptors[display_cfg->plane_descriptors[k].stream_index].writeback.active_writebacks_per_stream;
/* >1 writeback per stream is currently not supported */
if (display_cfg->stream_descriptors[display_cfg->plane_descriptors[k].stream_index].writeback.active_writebacks_per_stream > 1)
writeback_per_stream_supported = false;
}
outputs->support.EnoughWritebackUnits = writeback_per_stream_supported &&
totalNumberOfActiveWriteback <= ip->max_num_wb;