linux-kernel - Re: [PATCH 4/5] pata: Update experimental tags

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Message-ID: <4B05BD58.8040008@pobox.com>
Date:	Thu, 19 Nov 2009 16:49:12 -0500
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
CC:	Sergei Shtylyov <sshtylyov@...mvista.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Alan Cox <alan@...ux.intel.com>, linux-kernel@...r.kernel.org,
	linux-ide@...r.kernel.org
Subject: Re: [PATCH 4/5] pata: Update experimental tags

On 11/19/2009 02:31 PM, Bartlomiej Zolnierkiewicz wrote:
> Subject: [PATCH] pata_hpt{37x,3x2n}: add debounce delay to cable detection methods
>
> Alan Cox reported that cable detection sometimes works unreliably
> for HPT3xxN and that the issue is fixed by adding debounce delay
> as used by the vendor driver.
>
> Sergei Shtylyov also noticed that debounce delay is needed for all
> HPT37x and HPT3xxN chipsets according to vendor drivers.
>
> Signed-off-by: Bartlomiej Zolnierkiewicz<bzolnier@...il.com>
> ---
> In comparison to original patch the conversion from PCI access to
> io has been dropped as it is not required for the bugfix and makes
> patch easier for back-porting into -stable kernels.
>
>   drivers/ata/pata_hpt37x.c  |    3 +++
>   drivers/ata/pata_hpt3x2n.c |    3 +++
>   2 files changed, 6 insertions(+)
>
> Index: b/drivers/ata/pata_hpt37x.c
> ===================================================================
> --- a/drivers/ata/pata_hpt37x.c
> +++ b/drivers/ata/pata_hpt37x.c
> @@ -324,6 +324,9 @@ static int hpt37x_pre_reset(struct ata_l
>
>   	pci_read_config_byte(pdev, 0x5B,&scr2);
>   	pci_write_config_byte(pdev, 0x5B, scr2&  ~0x01);
> +
> +	udelay(10); /* debounce */
> +
>   	/* Cable register now active */
>   	pci_read_config_byte(pdev, 0x5A,&ata66);
>   	/* Restore state */
> Index: b/drivers/ata/pata_hpt3x2n.c
> ===================================================================
> --- a/drivers/ata/pata_hpt3x2n.c
> +++ b/drivers/ata/pata_hpt3x2n.c
> @@ -128,6 +128,9 @@ static int hpt3x2n_cable_detect(struct a
>
>   	pci_read_config_byte(pdev, 0x5B,&scr2);
>   	pci_write_config_byte(pdev, 0x5B, scr2&  ~0x01);
> +
> +	udelay(10); /* debounce */
> +
>   	/* Cable register now active */
>   	pci_read_config_byte(pdev, 0x5A,&ata66);
>   	/* Restore state */


applied -- same comment as last email, regarding hpt3x2n_cable_detect() fix

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