linux-kernel - Re: [PATCH libata #promise-sata-pata] sata

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Date:	Mon, 8 Jan 2007 09:08:53 +0100 (MET)
From:	Mikael Pettersson <mikpe@...uu.se>
To:	jeff@...zik.org
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH libata #promise-sata-pata] sata_promise: 2037x PATAPI support

On Sun, 07 Jan 2007 20:47:35 -0500, Jeff Garzik wrote:
> Mikael Pettersson wrote:
> > @@ -789,8 +789,14 @@ static void pdc_exec_command_mmio(struct
> >  static int pdc_check_atapi_dma(struct ata_queued_cmd *qc)
> >  {
> >  	u8 *scsicmd = qc->scsicmd->cmnd;
> > +	struct ata_port *ap = qc->ap;
> > +	struct pdc_host_priv *hp = ap->host->private_data;
> >  	int pio = 1; /* atapi dma off by default */
> >  
> > +	/* First generation chips cannot use ATAPI DMA on SATA ports */
> > +	if (!(hp->flags & PDC_FLAG_GEN_II) && sata_scr_valid(ap))
> > +		return 1;
> > +
> >  	/* Whitelist commands that may use DMA. */
> >  	switch (scsicmd[0]) {
> >  	case WRITE_12:
> 
> 
> IMO creating a new check_atapi_dma function for first-gen chips would be 
> the preferred way to add this check.

Agreed. Will do.

/Mikael
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