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Re: [PATCH 1/2] ide: Add tx4939ide driver

To: Atsushi Nemoto <>
Subject: Re: [PATCH 1/2] ide: Add tx4939ide driver
From: Sergei Shtylyov <>
Date: Fri, 12 Sep 2008 21:19:20 +0400
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Organization: MontaVista Software Inc.
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Atsushi Nemoto wrote:

+               /*
+                * If only one of XFERINT and HOST was asserted, mask
+                * this interrupt and wait for an another one.  Note

This comment somewhat contradicts the code which returns 1 if only HOST interupt is asserted if ERR is set.

Which is not its business to test. I think you should remove that above check -- if there's INTRQ asserted, then it's asserted. I wonder if BMIDE interrupt bit gets set in that case (suspecting it's not)...

Well, let me explain a bit.  The datasheed say I should wait _both_
XFERINT and HOST interrupt.  So, if only one of them was asserted, I
mask it and wait another one.  But on the error case, only HOST was
asserted and XFERINT was never asserted.  Then I could not exit from
"waiting another one" state, until timeout.

Hmm, I got it: you decide whether it's worth waiting more for XFEREND interrupt based on whether ERR is set or not. I suppose IDE_INT doesn't get set in case the command gets endede with ERR set?

MBR, Sergei

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