aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/brcm2708/patches-4.19/950-0766-xhci-Use-more-event-ring-segment-table-entries.patch
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0766-xhci-Use-more-event-ring-segment-table-entries.patch')
-rw-r--r--target/linux/brcm2708/patches-4.19/950-0766-xhci-Use-more-event-ring-segment-table-entries.patch60
1 files changed, 0 insertions, 60 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0766-xhci-Use-more-event-ring-segment-table-entries.patch b/target/linux/brcm2708/patches-4.19/950-0766-xhci-Use-more-event-ring-segment-table-entries.patch
deleted file mode 100644
index 9812db2d32..0000000000
--- a/target/linux/brcm2708/patches-4.19/950-0766-xhci-Use-more-event-ring-segment-table-entries.patch
+++ /dev/null
@@ -1,60 +0,0 @@
-From cba43f76fe083fb735257410b10d3904355207fe Mon Sep 17 00:00:00 2001
-From: Jonathan Bell <jonathan@raspberrypi.org>
-Date: Tue, 13 Aug 2019 15:53:29 +0100
-Subject: [PATCH 766/773] xhci: Use more event ring segment table entries
-
-Users have reported log spam created by "Event Ring Full" xHC event
-TRBs. These are caused by interrupt latency in conjunction with a very
-busy set of devices on the bus. The errors are benign, but throughput
-will suffer as the xHC will pause processing of transfers until the
-event ring is drained by the kernel. Expand the number of event TRB slots
-available by increasing the number of event ring segments in the ERST.
-
-Controllers have a hardware-defined limit as to the number of ERST
-entries they can process, so make the actual number in use
-min(ERST_MAX_SEGS, hw_max).
-
-Signed-off-by: Jonathan Bell <jonathan@raspberrypi.org>
----
- drivers/usb/host/xhci-mem.c | 8 +++++---
- drivers/usb/host/xhci.h | 4 ++--
- 2 files changed, 7 insertions(+), 5 deletions(-)
-
---- a/drivers/usb/host/xhci-mem.c
-+++ b/drivers/usb/host/xhci-mem.c
-@@ -2491,9 +2491,11 @@ int xhci_mem_init(struct xhci_hcd *xhci,
- * Event ring setup: Allocate a normal ring, but also setup
- * the event ring segment table (ERST). Section 4.9.3.
- */
-+ val2 = 1 << HCS_ERST_MAX(xhci->hcs_params2);
-+ val2 = min_t(unsigned int, ERST_MAX_SEGS, val2);
- xhci_dbg_trace(xhci, trace_xhci_dbg_init, "// Allocating event ring");
-- xhci->event_ring = xhci_ring_alloc(xhci, ERST_NUM_SEGS, 1, TYPE_EVENT,
-- 0, flags);
-+ xhci->event_ring = xhci_ring_alloc(xhci, val2, 1, TYPE_EVENT,
-+ 0, flags);
- if (!xhci->event_ring)
- goto fail;
- if (xhci_check_trb_in_td_math(xhci) < 0)
-@@ -2506,7 +2508,7 @@ int xhci_mem_init(struct xhci_hcd *xhci,
- /* set ERST count with the number of entries in the segment table */
- val = readl(&xhci->ir_set->erst_size);
- val &= ERST_SIZE_MASK;
-- val |= ERST_NUM_SEGS;
-+ val |= val2;
- xhci_dbg_trace(xhci, trace_xhci_dbg_init,
- "// Write ERST size = %i to ir_set 0 (some bits preserved)",
- val);
---- a/drivers/usb/host/xhci.h
-+++ b/drivers/usb/host/xhci.h
-@@ -1643,8 +1643,8 @@ struct urb_priv {
- * Each segment table entry is 4*32bits long. 1K seems like an ok size:
- * (1K bytes * 8bytes/bit) / (4*32 bits) = 64 segment entries in the table,
- * meaning 64 ring segments.
-- * Initial allocated size of the ERST, in number of entries */
--#define ERST_NUM_SEGS 1
-+ * Maximum number of segments in the ERST */
-+#define ERST_MAX_SEGS 8
- /* Initial allocated size of the ERST, in number of entries */
- #define ERST_SIZE 64
- /* Initial number of event segment rings allocated */