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Use one more bit of precision when calculating frequency from period. 

This makes the 4-times-NTSC color carrier get calculated to a
correct 14318180Hz, instead of 14318179Hz, which seems a bit odd.
This commit is contained in:
jakllsch 2011-07-29 19:19:14 +00:00
parent 2819a85a08
commit aec7af8d5f
1 changed files with 4 additions and 3 deletions
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7
sys/dev/ic/hpet.c
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@ -1,4 +1,4 @@
/* $NetBSD: hpet.c,v 1.11 2011/06/15 09:09:48 jruoho Exp $ */
/* $NetBSD: hpet.c,v 1.12 2011/07/29 19:19:14 jakllsch Exp $ */
/*
* Copyright (c) 2006 Nicolas Joly
@ -33,7 +33,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: hpet.c,v 1.11 2011/06/15 09:09:48 jruoho Exp $");
__KERNEL_RCSID(0, "$NetBSD: hpet.c,v 1.12 2011/07/29 19:19:14 jakllsch Exp $");
#include <sys/systm.h>
#include <sys/device.h>
@ -87,7 +87,8 @@ hpet_attach_subr(device_t dv)
aprint_error_dev(dv, "invalid timer period\n");
return;
}
tc->tc_frequency = 1000000000000000ULL / val;
val = (1000000000000000ULL * 2) / val;
tc->tc_frequency = (val / 2) + (val & 1);
/* Enable timer */
val = bus_space_read_4(sc->sc_memt, sc->sc_memh, HPET_CONFIG);