xhci: dbc: Improve performance by removing delay in transfer event polling.

Queue event polling work with 0 delay in case there are pending transfers
queued up. This is part 2 of a 3 part series that roughly triples dbc
performace when using adb push and pull over dbc.

Max/min push rate after patches is 210/118 MB/s, pull rate 171/133 MB/s,
tested with large files (300MB-9GB) by Łukasz Bartosik

First performance improvement patch was commit 31128e7492dc
("xhci: dbc: add dbgtty request to end of list once it completes")

Cc: Łukasz Bartosik <ukaszb@chromium.org>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20241227120142.1035206-2-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/xhci-dbgcap.c b/drivers/usb/host/xhci-dbgcap.c
index 227e513867dd2773fbdfbcb9a867ded4eae522b8..fd7895b24367db81644692e8a0a0382f70cc09eb 100644 (file)
--- a/drivers/usb/host/xhci-dbgcap.c
+++ b/drivers/usb/host/xhci-dbgcap.c
@@ -957,7 +957,7 @@ static void xhci_dbc_handle_events(struct work_struct *work)
                /* set fast poll rate if there are pending data transfers */
                if (!list_empty(&dbc->eps[BULK_OUT].list_pending) ||
                    !list_empty(&dbc->eps[BULK_IN].list_pending))
-                       poll_interval = 1;
+                       poll_interval = 0;
                break;
        default:
                dev_info(dbc->dev, "stop handling dbc events\n");