diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0666-xhci-Use-more-event-ring-segment-table-entries.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.19/950-0666-xhci-Use-more-event-ring-segment-table-entries.patch | 60 |
1 files changed, 0 insertions, 60 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0666-xhci-Use-more-event-ring-segment-table-entries.patch b/target/linux/brcm2708/patches-4.19/950-0666-xhci-Use-more-event-ring-segment-table-entries.patch deleted file mode 100644 index 0949f97f62..0000000000 --- a/target/linux/brcm2708/patches-4.19/950-0666-xhci-Use-more-event-ring-segment-table-entries.patch +++ /dev/null @@ -1,60 +0,0 @@ -From c2e02902a3b75b24306dac06cb6f75b683fa0267 Mon Sep 17 00:00:00 2001 -From: Jonathan Bell <jonathan@raspberrypi.org> -Date: Tue, 13 Aug 2019 15:53:29 +0100 -Subject: [PATCH] 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 -@@ -2495,9 +2495,11 @@ 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) -@@ -2510,7 +2512,7 @@ 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 */ |