kernel/wr-nic-eth: wait 1us after serving to vic irq, to force the edge

The Gennum manual doesn't say what is the miminum glitch for it to detect the edge, but this appears to work. I can't be sure, though. Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

kernel/wr-nic-eth: wait 1us after serving to vic irq, to force the edge
The Gennum manual doesn't say what is the miminum glitch for it to detect the edge, but this appears to work. I can't be sure, though. Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
1a314643 · Alessandro Rubini · 0dcf4ed3 · 1a314643
Commit 1a314643 authored Sep 24, 2012 by Alessandro Rubini
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wr-nic-eth.c kernel/wr-nic-eth.c +1 -0

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--- a/kernel/wr-nic-eth.c
+++ b/kernel/wr-nic-eth.c
@@ -72,6 +72,7 @@ irqreturn_t wrn_handler(int irq, void *dev_id)
 	fmc->op->irq_ack(fmc);
 	/* after ack, disable and re-enable the irq, so to force an edge */
 	writel(WRN_ALL_MASK, &vic->IDR);
+	udelay(1);
 	writel(WRN_ALL_MASK, &vic->IER);

 	return ret;