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When setting the FIFO preload, chose an entirely safe value rather than 

using a completely bogus heuristic to guess at one.  This might cause FIFO
underruns in particularly exciting video modes, but it also makes more
boring ones work correctly.
This commit is contained in:
bjh21 2006-10-28 17:39:59 +00:00
parent 7fa420acd5
commit 1aeaeb0efa
1 changed files with 14 additions and 9 deletions
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23
sys/arch/arm/iomd/vidc20config.c
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@ -1,4 +1,4 @@
/* $NetBSD: vidc20config.c,v 1.29 2006/10/21 17:08:22 bjh21 Exp $ */
/* $NetBSD: vidc20config.c,v 1.30 2006/10/28 17:39:59 bjh21 Exp $ */
/*
* Copyright (c) 2001 Reinoud Zandijk
@ -48,7 +48,7 @@
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vidc20config.c,v 1.29 2006/10/21 17:08:22 bjh21 Exp $");
__KERNEL_RCSID(0, "$NetBSD: vidc20config.c,v 1.30 2006/10/28 17:39:59 bjh21 Exp $");
#include <sys/types.h>
#include <sys/param.h>
@ -509,14 +509,19 @@ vidcvideo_setmode(struct vidc_mode *mode)
if (vm->flags & VID_NVSYNC)
ereg |= 1<<18;
vidcvideo_write(VIDC_EREG, ereg);
if (dispsize > 1024*1024) {
if (vm->hdisplay >= 800)
vidcvideo_write(VIDC_CONREG, 7<<8 | bpp_mask<<5);
else
vidcvideo_write(VIDC_CONREG, 6<<8 | bpp_mask<<5);
} else {
/*
* Set the video FIFO preload value and bit depth. Chapter 6
* of the VIDC20 Data Sheet has full details of the FIFO
* preload, but we don't do anything clever and just use the
* largest possible value, which is 7 when the VIDC20 is in
* 32-bit mode (0MB or 1MB VRAM) and 6 when it is in 64-bit
* mode (2MB VRAM).
*/
if (dispsize > 1024*1024)
vidcvideo_write(VIDC_CONREG, 6<<8 | bpp_mask<<5);
else
vidcvideo_write(VIDC_CONREG, 7<<8 | bpp_mask<<5);
}
}