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backend-drm: document additional-devices parameter

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Document the --additional-devices parameter to Weston to add secondary
DRM devices that will only be used as outputs, but not for rendering.

Fixes: 3c6cfe6bf4ce ("backend-drm: add additional-devices to support multi GPU")
Signed-off-by: Marek Vasut <marex@denx.de>
This commit is contained in:
Marek Vasut 2023-09-22 14:40:03 +02:00 committed by Pekka Paalanen
parent 4f17af4691
commit bd3de08b13
2 changed files with 9 additions and 2 deletions
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3
compositor/main.c
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@ -708,7 +708,8 @@ usage(int error_code)
fprintf(out,
"Options for drm:\n\n"
" --seat=SEAT\t\tThe seat that weston should run on, instead of the seat defined in XDG_SEAT\n"
" --drm-device=CARD\tThe DRM device to use, e.g. \"card0\".\n"
" --drm-device=CARD\tThe DRM device to use for rendering and output, e.g. \"card0\".\n"
" --additional-devices=CARD\tSecondary DRM devices to use for output only, e.g. \"card1,card2\".\n"
" --use-pixman\t\tUse the pixman (CPU) renderer (deprecated alias for --renderer=pixman)\n"
" --current-mode\tPrefer current KMS mode over EDID preferred mode\n"
" --continue-without-input\tAllow the compositor to start without input devices\n\n");

8
man/weston-drm.man
View File

@ -219,10 +219,16 @@ switching to the monitor preferred mode.
\fB\-\-drm\-device\fR=\fIcardN\fR
Use the DRM device
.I cardN
instead of the default heuristics based on seat assignments and boot VGA
for rendering and output instead of the default heuristics based on seat assignments and boot VGA
status. For example, use
.BR card0 .
.TP
\fB\-\-additional\-devices\fR=\fIcardN\fR
Comma separated list of secondary DRM devices
.I cardM,cardN
that will only be used as outputs, but not for rendering. For example, use
.BR card1,card2 .
.TP
\fB\-\-seat\fR=\fIseatid\fR
Use graphics and input devices designated for seat
.I seatid