From: Scott Wood <scottwood@freescale.com>
To: Scott Wood <scottwood@freescale.com>
Cc: David Laight <David.Laight@ACULAB.COM>, linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH] powerpc/fsl-booke: Work around erratum A-006958
Date: Mon, 15 Jul 2013 17:15:58 -0500 [thread overview]
Message-ID: <1373926558.8183.317@snotra> (raw)
In-Reply-To: <1373907234.8183.297@snotra> (from scottwood@freescale.com on Mon Jul 15 11:53:54 2013)
On 07/15/2013 11:53:54 AM, Scott Wood wrote:
> On 07/15/2013 03:45:36 AM, David Laight wrote:
>> Also, if the high word changes, there is no need to loop.
>> Just return the second value with a low word of zero
>> (the returned count happened while the function was active).
>=20
> That would be more complicated than looping.
That said, it's since been confirmed internally that the low word =20
should always be zero when this happens, so we could share the Cell =20
workaround code -- as long as we do something special in the timebase =20
sync code so that we don't get stuck if the timebase happens to be =20
frozen with TBL=3D=3D0. This would avoid the need for scratch registers =20
(other than CR0).
-Scott=
next prev parent reply other threads:[~2013-07-15 22:16 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-13 1:03 [PATCH] powerpc/fsl-booke: Work around erratum A-006958 Scott Wood
2013-07-15 6:03 ` Aneesh Kumar K.V
2013-07-15 16:55 ` Scott Wood
2013-07-15 8:45 ` David Laight
2013-07-15 16:53 ` Scott Wood
2013-07-15 22:15 ` Scott Wood [this message]
2013-07-16 8:28 ` David Laight
2013-07-16 18:16 ` Scott Wood
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