linux-kernel - Re: [PATCH] ahci: disable ncq feature for hisilicon sata

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Message-ID: <5396D8C9.6020607@linaro.org>
Date:	Tue, 10 Jun 2014 18:07:05 +0800
From:	"kefeng.wang" <kefeng.wang@...aro.org>
To:	Tejun Heo <tj@...nel.org>
CC:	Hans de Goede <hdegoede@...hat.com>,
	Zhangfei Gao <zhangfei.gao@...aro.org>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	wangkefeng.wang@...wei.com, xuwei5@...ilicon.com
Subject: Re: [PATCH] ahci: disable ncq feature for hisilicon sata

Hi Tejun,

I have a question, the hip04 and hix5hd2 soc use the old version of IP, but they
also have a new version of IP which support FBS and NCQ, and now the new one is
used by a new soc. How can I distinguish them, use "hisilicon,hisi-ahci-vX" or just
add "generic-ahci" string for the IP which is conformant with spec and has
no special customization and issue? Any advices, thanks.

Regards,
Kefeng

On 2014-6-10 17:51, kefeng.wang wrote:
> NCQ feature is unsupported on hisilicon sata controller, so disable it.
> This version of IP is used by hip04 and hix5hd2 soc.
> 
> Signed-off-by: Kefeng Wang <kefeng.wang@...aro.org>
> ---
>  drivers/ata/ahci_platform.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
> index ebe505c..0cfda8b 100644
> --- a/drivers/ata/ahci_platform.c
> +++ b/drivers/ata/ahci_platform.c
> @@ -58,7 +58,7 @@ static int ahci_probe(struct platform_device *pdev)
>         }
> 
>         if (of_device_is_compatible(dev->of_node, "hisilicon,hisi-ahci"))
> -               hflags |= AHCI_HFLAG_NO_FBS;
> +               hflags = AHCI_HFLAG_NO_FBS | AHCI_HFLAG_NO_NCQ;
> 
>         rc = ahci_platform_init_host(pdev, hpriv, &ahci_port_info,
>                                      hflags, 0, 0);
> 

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