linux-kernel - Re: [PATCH 36/86] pata_it8213: add UDMA100 and UDMA133 support

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Message-ID: <4B0E9928.2020809@ru.mvista.com>
Date:	Thu, 26 Nov 2009 18:05:12 +0300
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 36/86] pata_it8213: add UDMA100 and UDMA133 support

Hello.

Bartlomiej Zolnierkiewicz wrote:

> There shouldn't be any problems with it as IDE it8213 host driver
> has been supporting UDMA100 and UDMA133 for years.

> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>

> Index: b/drivers/ata/pata_it8213.c
> ===================================================================
> --- a/drivers/ata/pata_it8213.c
> +++ b/drivers/ata/pata_it8213.c
> @@ -164,7 +164,7 @@ static void it8213_set_dmamode (struct a
>  
>  		/* Clocks follow the PIIX style */
>  		u_speed = min(2 - (udma & 1), udma);
> -		if (udma == 5)
> +		if (udma > 4)
>  			u_clock = 0x1000;	/* 100Mhz */
>  		else if (udma > 2)
>  			u_clock = 1;		/* 66Mhz */
> @@ -264,7 +264,7 @@ static int it8213_init_one (struct pci_d
>  		.flags		= ATA_FLAG_SLAVE_POSS,
>  		.pio_mask	= ATA_PIO4,
>  		.mwdma_mask	= ATA_MWDMA2,
> -		.udma_mask 	= ATA_UDMA4, /* FIXME: want UDMA 100? */
> +		.udma_mask 	= ATA_UDMA6,
>  		.port_ops	= &it8213_ops,
>  	};
>  	/* Current IT8213 stuff is single port */

    Well, at 100 MHz it's probably not really UDMA6 but UDMA5 in disguise... 
though u_speed would be 2 instead of 1 which should correspond to either 3 
clocks or 1 clock according to Intel's documentation (different Intel docs 
give different figures and even ICH PRM gives *both* clocks).
    IOW, I doubt that 'it8213' is correct. Anybody has the datasheet?

MBR, Sergei
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