linux-kernel - Re: [PATCH v2] ata: Fix DVD not dectected at some Haswell platforms

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Date:	Wed, 13 Feb 2013 09:32:43 +0100
From:	Libor Pechacek <lpechacek@...e.cz>
To:	Youquan Song <youquan.song@...el.com>
Cc:	htejun@...il.com, ming.lei@...onical.com, sshtylyov@...sta.com,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	seth.heasley@...el.com, jlee@...e.com, james.d.ralston@...el.com,
	stable@...r.kernel.org, Youquan Song <youquan.song@...ux.intel.com>
Subject: Re: [PATCH v2] ata: Fix DVD not dectected at some Haswell platforms

Youquan Song,

On Fri 01-02-13 10:19:42, Youquan Song wrote:
> There is a quirk patch 5e5a4f5d5a08c9c504fe956391ac3dae2c66556d 
> "ata_piix: make DVD Drive recognisable on systems with Intel Sandybridge
>  chipsets(v2)
> 
>     This quirk patch fixes one kind of bug inside some Intel Sandybridge
>     chipsets, see reports from
> 
>            https://bugzilla.kernel.org/show_bug.cgi?id=40592.
> 
>     Many guys also have reported the problem before:
> 
>         https://bugs.launchpad.net/bugs/737388
>         https://bugs.launchpad.net/bugs/794642
>         https://bugs.launchpad.net/bugs/782389
>         ......
> 
>     With help from Tejun, the problem is found to be caused by 32bit PIO
>     mode, so introduce the quirk patch to disable 32bit PIO on SATA piix
>     for some Sandybridge CPT chipsets.
> 
>     Seth also tested the patch on all five affected chipsets
>     (pci device ID: 0x1c00, 0x1c01, 0x1d00, 0x1e00, 0x1e01), and found
>     the patch does fix the problem.
> "

As to my understanding Sergei did not suggest citing the whole commit message.
I also find the numerous references to Sandy Bridge confusing as this is a fix
for Lynx Point chipset.

How about rephrasing the commit message in a way similar to the following one?
------8<-----
We've hit a problem with DVD not recognized on Haswell Desktop platform which
includes Lynx Point 2-port SATA controller.  This quirk patch disables 32bit
PIO on the controller in IDE mode.
------>8-----

> 
> Recently, the problem was shown at Haswell Desktop platform which includes 2 
> ports IDE controller.
> 
> So introduce a quirk patch to disable 32bit PIO on this IDE controller. 
> 
> v2: Change spelling error in statememnt pointed by Sergei Shtylyov.
> 
> Tested-by: Lee, Chun-Yi <jlee@...e.com>
> Signed-off-by: Youquan Song <youquan.song@...el.com>
> Cc: stable@...r.kernel.org
> ---
>  drivers/ata/ata_piix.c |   14 +++++++++++++-
>  1 files changed, 13 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
> index ef773e1..1993e52 100644
> --- a/drivers/ata/ata_piix.c
> +++ b/drivers/ata/ata_piix.c
> @@ -150,6 +150,7 @@ enum piix_controller_ids {
>  	tolapai_sata,
>  	piix_pata_vmw,			/* PIIX4 for VMware, spurious DMA_ERR */
>  	ich8_sata_snb,
> +	ich8_2port_sata_snb,
>  };
>  
>  struct piix_map_db {
> @@ -326,7 +327,7 @@ static const struct pci_device_id piix_pci_tbl[] = {
>  	/* SATA Controller IDE (Lynx Point) */
>  	{ 0x8086, 0x8c01, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata_snb },
>  	/* SATA Controller IDE (Lynx Point) */
> -	{ 0x8086, 0x8c08, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata },
> +	{ 0x8086, 0x8c08, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata_snb },
>  	/* SATA Controller IDE (Lynx Point) */
>  	{ 0x8086, 0x8c09, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_2port_sata },
>  	/* SATA Controller IDE (Lynx Point-LP) */
> @@ -502,6 +503,7 @@ static const struct piix_map_db *piix_map_db_table[] = {
>  	[ich8m_apple_sata]	= &ich8m_apple_map_db,
>  	[tolapai_sata]		= &tolapai_map_db,
>  	[ich8_sata_snb]		= &ich8_map_db,
> +	[ich8_2port_sata_snb]	= &ich8_2port_map_db,
>  };
>  
>  static struct ata_port_info piix_port_info[] = {
> @@ -643,6 +645,16 @@ static struct ata_port_info piix_port_info[] = {
>  		.port_ops	= &piix_sata_ops,
>  	},
>  
> +	[ich8_2port_sata_snb] =
> +	{
> +		.flags		= PIIX_SATA_FLAGS | PIIX_FLAG_SIDPR | PIIX_FLAG_PIO16,

The line might be worth splitting as it's over 80 characters.

Otherwise the patch looks OK to me.

Libor

> The above patch only fixing the 4 ports IDE controller 32bit PIO mode. 

> +		.pio_mask	= ATA_PIO4,
> +		.mwdma_mask	= ATA_MWDMA2,
> +		.udma_mask	= ATA_UDMA6,
> +		.port_ops	= &piix_sata_ops,
> +	},
> +
> +
>  };
>  
>  static struct pci_bits piix_enable_bits[] = {
> -- 
> 1.6.4.2
> 
> --
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> 

-- 
Libor Pechacek
SUSE Labs, Prague
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