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d81c03f05e
These patches were generated from: https://github.com/raspberrypi/linux/commits/rpi-6.12.y With the following command: git format-patch -N v6.12.27..HEAD (HEAD -> 8d3206ee456a5ecdf9ddbfd8e5e231e4f0cd716e) Exceptions: - (def)configs patches - github workflows patches - applied & reverted patches - readme patches - wireless patches Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
33 lines
1.3 KiB
Diff
33 lines
1.3 KiB
Diff
From 2d8b1609411ac1163e7bd57002acd640c2c55e48 Mon Sep 17 00:00:00 2001
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From: Jonathan Bell <jonathan@raspberrypi.com>
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Date: Thu, 19 Oct 2023 13:29:10 +0300
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Subject: [PATCH] xhci: Use more event ring segment table entries
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Users have reported log spam created by "Event Ring Full" xHC event
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TRBs. These are caused by interrupt latency in conjunction with a very
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busy set of devices on the bus. The errors are benign, but throughput
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will suffer as the xHC will pause processing of transfers until the
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event ring is drained by the kernel. Expand the number of event TRB slots
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available by increasing the number of event ring segments in the ERST.
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Controllers have a hardware-defined limit as to the number of ERST
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entries they can process, so make the actual number in use
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min(ERST_MAX_SEGS, hw_max).
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Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
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---
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drivers/usb/host/xhci.h | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/drivers/usb/host/xhci.h
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+++ b/drivers/usb/host/xhci.h
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@@ -1395,7 +1395,7 @@ struct urb_priv {
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};
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/* Number of Event Ring segments to allocate, when amount is not specified. (spec allows 32k) */
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-#define ERST_DEFAULT_SEGS 2
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+#define ERST_DEFAULT_SEGS 8
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/* Poll every 60 seconds */
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#define POLL_TIMEOUT 60
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/* Stop endpoint command timeout (secs) for URB cancellation watchdog timer */
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