Linux-ide Archive on lore.kernel.org
 help / color / Atom feed
From: Roger Quadros <rogerq@ti.com>
To: Hans de Goede <hdegoede@redhat.com>, <axboe@kernel.dk>
Cc: <vigneshr@ti.com>, <nsekhar@ti.com>, <linux-ide@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, <stable@vger.kernel.org>
Subject: Re: [PATCH] ata: ahci_platform: add 32-bit quirk for dwc-ahci
Date: Thu, 6 Feb 2020 13:54:57 +0200
Message-ID: <50ad68d2-39e2-d2f0-1794-cf7b499cb1f0@ti.com> (raw)
In-Reply-To: <d3a80407-a40a-c9e4-830f-138cfe9b163c@redhat.com>

Hans,

On 06/02/2020 13:50, Hans de Goede wrote:
> Hi,
> 
> On 2/6/20 12:17 PM, Roger Quadros wrote:
>> On TI Platforms using LPAE, SATA breaks with 64-bit DMA.
>> Restrict it to 32-bit.
>>
>> Cc: stable@vger.kernel.org
>> Signed-off-by: Roger Quadros <rogerq@ti.com>
>> ---
>>   drivers/ata/ahci_platform.c | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
>> index 3aab2e3d57f3..b925dc54cfa5 100644
>> --- a/drivers/ata/ahci_platform.c
>> +++ b/drivers/ata/ahci_platform.c
>> @@ -62,6 +62,9 @@ static int ahci_probe(struct platform_device *pdev)
>>       if (of_device_is_compatible(dev->of_node, "hisilicon,hisi-ahci"))
>>           hpriv->flags |= AHCI_HFLAG_NO_FBS | AHCI_HFLAG_NO_NCQ;
>> +    if (of_device_is_compatible(dev->of_node, "snps,dwc-ahci"))
>> +        hpriv->flags |= AHCI_HFLAG_32BIT_ONLY;
>> +
> 
> The "snps,dwc-ahci" is a generic (non TI specific) compatible which
> is e.g. also used on some exynos devices. So using that to key the
> setting of the 32 bit flag seems wrong to me.

You are right, Vignesh also pointed this out to me offline.

snps,dwc-ahci does indeed support 64-bit addressing, so this patch is wrong.

> 
> IMHO it would be better to introduce a TI specific compatible
> and use that to match on instead (and also adjust the dts files
> accordingly).

The TI platform's TRM does say it has only 36-bits of the controller wired
in the device. If that was the case and DDR address never goes beyond
36-bits, we don't understand why it fails in the first place.

80000000-afcfffff : System RAM
b0000000-feffffff : System RAM
200000000-27fffffff : System RAM

cheers,
-roger

> 
> Regards,
> 
> Hans
> 
> 
> 
>>       port = acpi_device_get_match_data(dev);
>>       if (!port)
>>           port = &ahci_port_info;
>>
> 

-- 
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

  reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-06 11:17 Roger Quadros
2020-02-06 11:50 ` Hans de Goede
2020-02-06 11:54   ` Roger Quadros [this message]
2020-02-12 11:01   ` Roger Quadros
2020-02-12 11:32     ` Hans de Goede
2020-02-12 11:43       ` Robin Murphy
2020-02-12 11:56         ` David Laight
2020-02-12 12:09           ` Robin Murphy
2020-02-13  7:24         ` Roger Quadros

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=50ad68d2-39e2-d2f0-1794-cf7b499cb1f0@ti.com \
    --to=rogerq@ti.com \
    --cc=axboe@kernel.dk \
    --cc=hdegoede@redhat.com \
    --cc=linux-ide@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=nsekhar@ti.com \
    --cc=stable@vger.kernel.org \
    --cc=vigneshr@ti.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-ide Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-ide/0 linux-ide/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-ide linux-ide/ https://lore.kernel.org/linux-ide \
		linux-ide@vger.kernel.org
	public-inbox-index linux-ide

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-ide


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git