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Message-ID: <ED492CCEAF882048BC2237DE806547C9079D3C6C@039-SN2MPN1-012.039d.mgd.msft.net>
Date: Thu, 6 Sep 2012 11:57:37 +0000
From: Xie Shaohui-B21989 <B21989@...escale.com>
To: Sergei Shtylyov <sshtylyov@...sta.com>
CC: "jgarzik@...ox.com" <jgarzik@...ox.com>,
"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"David.Laight@...LAB.COM" <David.Laight@...LAB.COM>,
Bhartiya Anju-B07263 <B07263@...escale.com>
Subject: RE: [PATCH] [v2] sata_fsl: add workaround for data length mismatch
on freescale V2 controller
> >
> > hstatus = ioread32(hcr_base + HSTATUS);
> >
> > sata_fsl_scr_read(&ap->link, SCR_ERROR, &SError);
> >
> > + /* Read command completed register */
> > + done_mask = ioread32(hcr_base + CC);
> > +
> > + /* Workaround for data length mismatch errata */
> > + if (unlikely(hstatus & INT_ON_DATA_LENGTH_MISMATCH)) {
> > + for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
> > + qc = ata_qc_from_tag(ap, tag);
> > + if (qc && ata_is_atapi(qc->tf.protocol)) {
> > + u32 Hcontrol;
>
> No uppercase in variable names please.
[S.H] OK.
Besides, you have 'hstatus'
> variable already and that would be inconsistent.
[S.H] Yes, but I ignored fatal error and device error, so this won't be an issue.
>
> > +#define HCONTROL_CLEAR_ERROR (1 << 27)
> > + /* Set HControl[27] to clear error registers */
> > + Hcontrol = ioread32(hcr_base + HCONTROL);
> > + iowrite32(Hcontrol | HCONTROL_CLEAR_ERROR,
> > + hcr_base + HCONTROL);
> > +
> > + /* Clear HControl[27] */
> > + iowrite32(Hcontrol & (~HCONTROL_CLEAR_ERROR),
>
> Parens not needed around ~HCONTROL_CLEAR_ERROR.
[S.H] OK.
Best Regards,
Shaohui Xie
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