linux-kernel - Re: [PATCH] Fix SH DMAC code to handle PVR2 cascade

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Date:	Thu, 4 Oct 2007 12:34:36 +0100 (BST)
From:	"Adrian McMenamin" <adrian@...golddream.dyndns.info>
To:	"Paul Mundt" <lethal@...ux-sh.org>,
	"Adrian McMenamin" <adrian@...golddream.dyndns.info>,
	"linux-sh" <linuxsh-dev@...ts.sourceforge.net>,
	"LKML" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Fix SH DMAC code to handle PVR2 cascade

On Thu, October 4, 2007 11:01 am, Paul Mundt wrote:
> So for PVR2 cascade, what does the CHCR value work out to? Both
> CHCR_TS_MASK and CHCR_TS_SHIFT haven't changed for SH7750, so this
> suggests that either the CHCR value is just wrong or we've had a
> long-standing bug with the CHCR.TS mask.
>
> Either way, we are not going to hardcode a ts_shift value when the CHCR
> has all of the information encoded in it!
>

There *is* a long standing bug in CHCR_TS_MASK. It is meant to mask out
all but bits 6:4 but in fact only masks bits 5 and 4. If it is set to 0x70
and not 0x30 this should work - though as usual I cannot make a patch to
check this out at the moment.
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