Messages in this thread Patch in this message | | | Date | Mon, 12 Nov 2001 14:05:30 -0200 | Subject | Re: [PATCH] VIA timer fix was removed? | From | Jeronimo Pellegrini <> |
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On Mon, Nov 12, 2001 at 03:48:24PM +0100, Andrzej Krzysztofowicz wrote: > > The following patch (introduced by Vojtech Pavlik some time ago) was > > removed somewhere between 2.4.14 and 2.4.15-pre3. > > Without it, the timer counter is reset to a wrong value and > > gettimeofday() starts to return strange values > > > > Nothing aboutit is mentioned in the changelog, so I suppose it wasn't > > supposed to be removed? > > Maybe, it happens because somebody forgot to comment why this code is > necessary here ? > Just a guess...
Then perhaps this would be a good idea?
J.
--- linux-2.4.15-pre3/arch/i386/kernel/time.c Sun Nov 11 21:33:31 2001 +++ linux-2.4.15-pre3-new/arch/i386/kernel/time.c Mon Nov 12 14:04:20 2001 @@ -501,6 +501,19 @@ count = inb_p(0x40); /* read the latched count */ count |= inb(0x40) << 8; + + /* + * When using some via chipsets (as the vt82c686a, for example) + * the system timer counter (i8253) should be reprogrammed in + * this case, otherwise it may be reset to a wrong value. + */ + if (count > LATCH-1) { + outb_p(0x34, 0x43); + outb_p(LATCH & 0xff, 0x40); + outb(LATCH >> 8, 0x40); + count = LATCH - 1; + } + spin_unlock(&i8253_lock); count = ((LATCH-1) - count) * TICK_SIZE; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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