[src/trunk]: src/sys/dev/usb Interrupt polling was spread very unevenly. Use...

[augustss <augustss%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/1c1fa8543c4c
branches:  trunk
changeset: 580523:1c1fa8543c4c
user:      augustss <augustss%NetBSD.org@localhost>
date:      Wed Apr 27 16:42:26 2005 +0000

description:
Interrupt polling was spread very unevenly.  Use the same bit reversal
trick as in ohci.c to correct this.

diffstat:

 sys/dev/usb/ehci.c |  21 ++++++++++++++++++---
 1 files changed, 18 insertions(+), 3 deletions(-)

diffs (49 lines):

diff -r 0fa910977213 -r 1c1fa8543c4c sys/dev/usb/ehci.c
--- a/sys/dev/usb/ehci.c        Wed Apr 27 16:41:54 2005 +0000
+++ b/sys/dev/usb/ehci.c        Wed Apr 27 16:42:26 2005 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ehci.c,v 1.93 2005/04/27 16:20:26 augustss Exp $ */
+/*     $NetBSD: ehci.c,v 1.94 2005/04/27 16:42:26 augustss Exp $ */
 
 /*
  * Copyright (c) 2004 The NetBSD Foundation, Inc.
@@ -65,7 +65,7 @@
 */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ehci.c,v 1.93 2005/04/27 16:20:26 augustss Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ehci.c,v 1.94 2005/04/27 16:42:26 augustss Exp $");
 
 #include "ohci.h"
 #include "uhci.h"
@@ -312,6 +312,17 @@
        ehci_device_isoc_done,
 };
 
+static uint8_t revbits[EHCI_MAX_POLLRATE] = {
+0x00,0x80,0x40,0xc0,0x20,0xa0,0x60,0xe0,0x10,0x90,0x50,0xd0,0x30,0xb0,0x70,0xf0,
+0x08,0x88,0x48,0xc8,0x28,0xa8,0x68,0xe8,0x18,0x98,0x58,0xd8,0x38,0xb8,0x78,0xf8,
+0x04,0x84,0x44,0xc4,0x24,0xa4,0x64,0xe4,0x14,0x94,0x54,0xd4,0x34,0xb4,0x74,0xf4,
+0x0c,0x8c,0x4c,0xcc,0x2c,0xac,0x6c,0xec,0x1c,0x9c,0x5c,0xdc,0x3c,0xbc,0x7c,0xfc,
+0x02,0x82,0x42,0xc2,0x22,0xa2,0x62,0xe2,0x12,0x92,0x52,0xd2,0x32,0xb2,0x72,0xf2,
+0x0a,0x8a,0x4a,0xca,0x2a,0xaa,0x6a,0xea,0x1a,0x9a,0x5a,0xda,0x3a,0xba,0x7a,0xfa,
+0x06,0x86,0x46,0xc6,0x26,0xa6,0x66,0xe6,0x16,0x96,0x56,0xd6,0x36,0xb6,0x76,0xf6,
+0x0e,0x8e,0x4e,0xce,0x2e,0xae,0x6e,0xee,0x1e,0x9e,0x5e,0xde,0x3e,0xbe,0x7e,0xfe,
+};
+
 usbd_status
 ehci_init(ehci_softc_t *sc)
 {
@@ -448,7 +459,11 @@
        }
        /* Point the frame list at the last level (128ms). */
        for (i = 0; i < sc->sc_flsize; i++) {
-               sc->sc_flist[i] = htole32(EHCI_LINK_QH |
+               int j;
+
+               j = (i & ~(EHCI_MAX_POLLRATE-1)) |
+                   revbits[i & (EHCI_MAX_POLLRATE-1)];
+               sc->sc_flist[j] = htole32(EHCI_LINK_QH |
                    sc->sc_islots[EHCI_IQHIDX(EHCI_IPOLLRATES - 1,
                    i)].sqh->physaddr);
        }