AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-12-19 18:58:48 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

drm/dp_mst: Revise broadcast msg lct & lcr

Browse Source 
commit 419e91ea3143bf26991442465ac64d9461e98d96 upstream.

[Why & How]
According to DP spec, broadcast message LCT equals to 1 and LCR equals
to 6. Current implementation is incorrect. Fix it.
In addition, revise a bit the hdr->rad handling to include broadcast
case.

Signed-off-by: Wayne Lin <Wayne.Lin@amd.com>
Cc: stable@vger.kernel.org
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210224101521.6713-2-Wayne.Lin@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wayne Lin 2021-02-24 18:15:20 +08:00 committed by Greg Kroah-Hartman
parent 9b50c185d2
commit 7eea3eff02
1 changed files with 9 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/gpu/drm/drm_dp_mst_topology.c
View File

@ -2829,10 +2829,15 @@ static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr,
else
hdr->broadcast = 0;
hdr->path_msg = txmsg->path_msg;
hdr->lct = mstb->lct;
hdr->lcr = mstb->lct - 1;
if (mstb->lct > 1)
memcpy(hdr->rad, mstb->rad, mstb->lct / 2);
if (hdr->broadcast) {
hdr->lct = 1;
hdr->lcr = 6;
} else {
hdr->lct = mstb->lct;
hdr->lcr = mstb->lct - 1;
}
memcpy(hdr->rad, mstb->rad, hdr->lct / 2);
return 0;
}