From f07e572f6447465d8938679533d604e402b0f066 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= Date: Thu, 18 Feb 2021 18:04:33 +0100 Subject: bcm27xx: import latest patches from the RPi foundation MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit bcm2708: boot tested on RPi B+ v1.2 bcm2709: boot tested on RPi 3B v1.2 and RPi 4B v1.1 4G bcm2710: boot tested on RPi 3B v1.2 bcm2711: boot tested on RPi 4B v1.1 4G Signed-off-by: Álvaro Fernández Rojas --- ...Use-more-event-ring-segment-table-entries.patch | 60 ++++++++++++++++++++++ 1 file changed, 60 insertions(+) create mode 100644 target/linux/bcm27xx/patches-5.4/950-0293-xhci-Use-more-event-ring-segment-table-entries.patch (limited to 'target/linux/bcm27xx/patches-5.4/950-0293-xhci-Use-more-event-ring-segment-table-entries.patch') diff --git a/target/linux/bcm27xx/patches-5.4/950-0293-xhci-Use-more-event-ring-segment-table-entries.patch b/target/linux/bcm27xx/patches-5.4/950-0293-xhci-Use-more-event-ring-segment-table-entries.patch new file mode 100644 index 0000000000..4b4766f739 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.4/950-0293-xhci-Use-more-event-ring-segment-table-entries.patch @@ -0,0 +1,60 @@ +From 90c56c8f52c912aa6e990e63d953b6dbccea7250 Mon Sep 17 00:00:00 2001 +From: Jonathan Bell +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 +--- + 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 +@@ -2503,9 +2503,11 @@ 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) +@@ -2518,7 +2520,7 @@ 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 +@@ -1649,8 +1649,8 @@ 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 */ -- cgit v1.2.3