On Mon, Jun 22, 2020 at 08:05:29PM +0200, gregkh@xxxxxxxxxxxxxxxxxxx wrote:
The patch below does not apply to the 5.7-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 873a95e0d59ac06901ae261dda0b7165ffd002b8 Mon Sep 17 00:00:00 2001
From: Lyude Paul <lyude@xxxxxxxxxx>
Date: Fri, 3 Apr 2020 15:47:15 -0400
Subject: [PATCH] drm/dp_mst: Increase ACT retry timeout to 3s
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Currently we only poll for an ACT up to 30 times, with a busy-wait delay
of 100µs between each attempt - giving us a timeout of 2900µs. While
this might seem sensible, it would appear that in certain scenarios it
can take dramatically longer then that for us to receive an ACT. On one
of the EVGA MST hubs that I have available, I observed said hub
sometimes taking longer then a second before signalling the ACT. These
delays mostly seem to occur when previous sideband messages we've sent
are NAKd by the hub, however it wouldn't be particularly surprising if
it's possible to reproduce times like this simply by introducing branch
devices with large LCTs since payload allocations have to take effect on
every downstream device up to the payload's target.
So, instead of just retrying 30 times we poll for the ACT for up to 3ms,
and additionally use usleep_range() to avoid a very long and rude
busy-wait. Note that the previous retry count of 30 appears to have been
arbitrarily chosen, as I can't find any mention of a recommended timeout
or retry count for ACTs in the DisplayPort 2.0 specification. This also
goes for the range we were previously using for udelay(), although I
suspect that was just copied from the recommended delay for link
training on SST devices.
Changes since v1:
* Use readx_poll_timeout() instead of open-coding timeout loop - Sean
Paul
Changes since v2:
* Increase poll interval to 200us - Sean Paul
* Print status in hex when we timeout waiting for ACT - Sean Paul
Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>
Fixes: ad7f8a1f9ced ("drm/helper: add Displayport multi-stream helper (v0.6)")
Cc: Sean Paul <sean@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v3.17+
Reviewed-by: Sean Paul <sean@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20200406221253.1307209-4-lyude@xxxxxxxxxx
Conflict with the kdocs change from 17e03aa8cc16 ("drm/dp_mst: Improve kdocs
for drm_dp_check_act_status()"). I've fixed it up and queued for all branches.
--
Thanks,
Sasha
