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drm/amd/display: Exclude the MST overhead from BW deallocation

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[Why]
The MST overhead was incorrectly included
in the requested BW during BW deallocation.

[How]
Exclude the MST overhead from BW deallocation.

Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Reviewed-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Signed-off-by: Cruise Hung <Cruise.Hung@amd.com>
Signed-off-by: Ivan Lipski <ivan.lipski@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Cruise Hung 2026-05-06 21:19:10 +08:00 committed by Alex Deucher
parent 8d61521e0a
commit 246ff639ec
1 changed files with 20 additions and 21 deletions
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41
drivers/gpu/drm/amd/display/dc/link/link_dpms.c
View File

@ -2097,10 +2097,10 @@ static enum dc_status enable_link(
return status;
}
static bool allocate_usb4_bandwidth_for_stream(struct dc_stream_state *stream, int bw)
static bool allocate_usb4_bandwidth_for_stream(struct dc_stream_state *stream, int stream_bw)
{
struct dc_link *link = stream->sink->link;
int req_bw = bw;
int req_bw = stream_bw;
DC_LOGGER_INIT(link->ctx->logger);
@ -2108,39 +2108,38 @@ static bool allocate_usb4_bandwidth_for_stream(struct dc_stream_state *stream, i
return false;
if (stream->signal == SIGNAL_TYPE_DISPLAY_PORT_MST) {
int sink_index = 0;
int sink_index = -1;
unsigned int i = 0;
for (i = 0; i < link->sink_count; i++) {
if (link->remote_sinks[i] == NULL)
continue;
if (stream->sink->sink_id != link->remote_sinks[i]->sink_id)
if (stream->sink->sink_id != link->remote_sinks[i]->sink_id) {
DC_LOG_DEBUG("%s: add remote_sink=%s, request_bw=%d\n", __func__,
(const char *)(&link->remote_sinks[i]->edid_caps.display_name[0]),
link->dpia_bw_alloc_config.remote_sink_req_bw[i]);
req_bw += link->dpia_bw_alloc_config.remote_sink_req_bw[i];
else
} else
sink_index = i;
}
link->dpia_bw_alloc_config.remote_sink_req_bw[sink_index] = bw;
}
if (sink_index >= 0)
link->dpia_bw_alloc_config.remote_sink_req_bw[sink_index] = stream_bw;
else
DC_LOG_WARNING("%s: stream sink_id=%u not found in remote_sinks[]\n",
__func__, stream->sink->sink_id);
link->dpia_bw_alloc_config.dp_overhead = link_dpia_get_dp_overhead(link);
req_bw += link->dpia_bw_alloc_config.dp_overhead;
if (req_bw) {
link->dpia_bw_alloc_config.dp_overhead = link_dpia_get_dp_overhead(link);
req_bw += link->dpia_bw_alloc_config.dp_overhead;
} else
link->dpia_bw_alloc_config.dp_overhead = 0;
}
link_dp_dpia_allocate_usb4_bandwidth_for_stream(link, req_bw);
if (stream->signal == SIGNAL_TYPE_DISPLAY_PORT_MST) {
unsigned int i = 0;
for (i = 0; i < link->sink_count; i++) {
if (link->remote_sinks[i] == NULL)
continue;
DC_LOG_DEBUG("%s, remote_sink=%s, request_bw=%d\n", __func__,
(const char *)(&link->remote_sinks[i]->edid_caps.display_name[0]),
link->dpia_bw_alloc_config.remote_sink_req_bw[i]);
}
}
return true;
}