linux-kernel - Re: [PATCH] pata_it8213: MWDMA0 is unsupported

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Date:	Thu, 26 Nov 2009 18:00:54 +0100
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	linux-ide@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pata_it8213: MWDMA0 is unsupported

On Thursday 26 November 2009 05:28:36 pm Bartlomiej Zolnierkiewicz wrote:
> 
> MWDMA0 timings cannot be met with the PIIX based controller
> programming interface.
> 
> This change should be safe as this is how we have been doing
> things in IDE it8213 host driver for years.
> 
> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
> ---
> Verified with the documentation (similar case as with pata_efar).

Uhhh, no...

Too many damn drivers.

Too much damn duplication.

Too much damn subtle differences here and there.

The hardware is probably fine for MWMDA0 when it comes to pata_{efar,it8213},
it just not documented properly in the data sheet.

I'll drop those two patches from my tree and take some break..

> On top of patches from yesterday.
> 
>  drivers/ata/pata_it8213.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Index: b/drivers/ata/pata_it8213.c
> ===================================================================
> --- a/drivers/ata/pata_it8213.c
> +++ b/drivers/ata/pata_it8213.c
> @@ -227,7 +227,7 @@ static int it8213_init_one (struct pci_d
>  	static const struct ata_port_info info = {
>  		.flags		= ATA_FLAG_SLAVE_POSS,
>  		.pio_mask	= ATA_PIO4,
> -		.mwdma_mask	= ATA_MWDMA2,
> +		.mwdma_mask	= ATA_MWDMA12_ONLY,
>  		.udma_mask 	= ATA_UDMA6,
>  		.port_ops	= &it8213_ops,
>  	};
--
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