From: Jeff Garzik <jeff@garzik.org>
To: Mikael Pettersson <mikpe@it.uu.se>
Cc: linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH libata #promise-sata-pata] sata_promise: 2037x PATAPI support
Date: Sun, 07 Jan 2007 20:47:35 -0500 [thread overview]
Message-ID: <45A1A2B7.8000601@garzik.org> (raw)
In-Reply-To: <200701072239.l07Mdju7028895@harpo.it.uu.se>
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.
Jeff
next prev parent reply other threads:[~2007-01-08 1:47 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-07 22:39 [PATCH libata #promise-sata-pata] sata_promise: 2037x PATAPI support Mikael Pettersson
2007-01-08 1:47 ` Jeff Garzik [this message]
2007-01-08 10:30 ` Alan
-- strict thread matches above, loose matches on Subject: below --
2007-01-08 8:08 Mikael Pettersson
2007-01-06 20:32 Mikael Pettersson
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