[src/trunk]: src/sys/dev/pci let the fifo drain periodically - we need this e...

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

details:   https://anonhg.NetBSD.org/src/rev/d47b9e50f8fb
branches:  trunk
changeset: 777670:d47b9e50f8fb
user:      macallan <macallan%NetBSD.org@localhost>
date:      Tue Feb 28 21:22:20 2012 +0000

description:
let the fifo drain periodically - we need this even in 8 bit on some
hardware, like rv100 paired with a semi-fast CPU

diffstat:

 sys/dev/pci/radeonfb.c |  14 +++++++++++---
 1 files changed, 11 insertions(+), 3 deletions(-)

diffs (49 lines):

diff -r 9ef21298d20e -r d47b9e50f8fb sys/dev/pci/radeonfb.c
--- a/sys/dev/pci/radeonfb.c    Tue Feb 28 20:41:19 2012 +0000
+++ b/sys/dev/pci/radeonfb.c    Tue Feb 28 21:22:20 2012 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: radeonfb.c,v 1.56 2012/02/28 20:23:51 macallan Exp $ */
+/*     $NetBSD: radeonfb.c,v 1.57 2012/02/28 21:22:20 macallan Exp $ */
 
 /*-
  * Copyright (c) 2006 Itronix Inc.
@@ -70,7 +70,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: radeonfb.c,v 1.56 2012/02/28 20:23:51 macallan Exp $");
+__KERNEL_RCSID(0, "$NetBSD: radeonfb.c,v 1.57 2012/02/28 21:22:20 macallan Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -2672,7 +2672,7 @@
        int i, x, y, wi, he, r, g, b, aval;
        int r1, g1, b1, r0, g0, b0, fgo, bgo;
        uint8_t *data8;
-       int rv;
+       int rv, cnt;
 
        if (dp->rd_wsmode != WSDISPLAYIO_MODE_EMUL)
                return;
@@ -2734,6 +2734,9 @@
 #define R3G3B2(r, g, b) ((r & 0xe0) | ((g >> 3) & 0x1c) | (b >> 6))
        bg8 = R3G3B2(r0, g0, b0);
        fg8 = R3G3B2(r1, g1, b1);
+
+       radeonfb_wait_fifo(sc, 20);
+       cnt = 0;
        for (i = 0; i < ri->ri_fontscale; i++) {
                aval = *data8;
                if (aval == 0) {
@@ -2757,6 +2760,11 @@
                         * out 
                         */
                        latch = 0;
+                       cnt++;
+                       if (cnt > 16) {
+                               cnt = 0;
+                               radeonfb_wait_fifo(sc, 20);
+                       }
                }
                data8++;
        }