linux-kernel - Re: [PATCH v3] ata: pata_at91.c bugfix for high master clock

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Message-ID: <20110328192955.GA2291@localhost.localdomain>
Date:	Mon, 28 Mar 2011 21:29:55 +0200
From:	Stanislaw Gruszka <stf_xl@...pl>
To:	Igor Plyatov <plyatov@...il.com>
Cc:	Jeff Garzik <jgarzik@...ox.com>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] ata: pata_at91.c bugfix for high master clock

On Mon, Mar 28, 2011 at 03:59:55PM +0400, Igor Plyatov wrote:
> The AT91SAM9 microcontrollers with master clock higher then 105 MHz
> and PIO0, have overflow of the NCS_RD_PULSE value in the MSB. This
> lead to "NCS_RD_PULSE" pulse longer then "NRD_CYCLE" pulse and driver
> does not detect ATA device.
> 
> Signed-off-by: Igor Plyatov <plyatov@...il.com>
> ---
>  drivers/ata/pata_at91.c |    8 +++++++-
>  1 files changed, 7 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/ata/pata_at91.c b/drivers/ata/pata_at91.c
> index d1aaeb5..3c2bf86 100644
> --- a/drivers/ata/pata_at91.c
> +++ b/drivers/ata/pata_at91.c
> @@ -33,11 +33,12 @@
>  
>  
>  #define DRV_NAME "pata_at91"
> -#define DRV_VERSION "0.1"
> +#define DRV_VERSION "0.2"
>  
>  #define CF_IDE_OFFSET	    0x00c00000
>  #define CF_ALT_IDE_OFFSET   0x00e00000
>  #define CF_IDE_RES_SIZE     0x08
> +#define NCS_RD_PULSE_LIMIT  0x3f /* maximal value for pulse bitfields */
>  
>  struct at91_ide_info {
>  	unsigned long mode;
> @@ -110,6 +111,11 @@ static void set_smc_timing(struct device *dev,
>  	/* (CS0, CS1, DIR, OE) <= (CFCE1, CFCE2, CFRNW, NCSX) timings */
>  	ncs_read_setup = 1;
>  	ncs_read_pulse = read_cycle - 2;
> +	if (ncs_read_pulse > NCS_RD_PULSE_LIMIT) {
> +		ncs_read_pulse = NCS_RD_PULSE_LIMIT;

It's ATA specification break, I explained this already here:
http://marc.info/?l=linux-ide&m=129254321006232&w=2
Do we want fix that do not conform specification?

Stanislaw
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