linux-kernel - Re: [PATCH v1 10/10] scsi: ufs-qcom: enable UFSHCD_QUIRK_BROKEN_UFS_HCI

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Date:	Tue, 19 May 2015 23:41:33 +0900
From:	Akinobu Mita <akinobu.mita@...il.com>
To:	Yaniv Gardi <ygardi@...eaurora.org>
Cc:	Jej B <James.Bottomley@...senpartnership.com>,
	Christoph Hellwig <hch@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	linux-arm-msm@...r.kernel.org, Santosh Y <santoshsy@...il.com>,
	linux-scsi-owner@...r.kernel.org,
	Subhash Jadavani <subhashj@...eaurora.org>,
	dovl@...eaurora.org, Dolev Raviv <draviv@...eaurora.org>,
	Vinayak Holikatti <vinholikatti@...il.com>,
	"James E.J. Bottomley" <JBottomley@...n.com>,
	chuanxiao.dong@...el.com
Subject: Re: [PATCH v1 10/10] scsi: ufs-qcom: enable UFSHCD_QUIRK_BROKEN_UFS_HCI_VERSION

2015-05-18 0:55 GMT+09:00 Yaniv Gardi <ygardi@...eaurora.org>:
> Newer revisions of QUALCOMM Technologies UFS host controller may not
> advertise the correct version information in UFS HCI VER register.
> To handle this, enable UFSHCD_QUIRK_BROKEN_UFS_HCI_VERSION to let
> UFS standard host controller driver call into vendor specific
> operation to get right UFS HCI VER register value.
>
> Signed-off-by: Yaniv Gardi <ygardi@...eaurora.org>
>
> ---
>  drivers/scsi/ufs/ufs-qcom.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
>
> diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
> index de9cfb0..4cdffa4 100644
> --- a/drivers/scsi/ufs/ufs-qcom.c
> +++ b/drivers/scsi/ufs/ufs-qcom.c
> @@ -694,6 +694,16 @@ out:
>         return ret;
>  }
>
> +static u32 ufs_qcom_get_ufs_hci_version(struct ufs_hba *hba)
> +{
> +       struct ufs_qcom_host *host = hba->priv;
> +
> +       if (host->hw_ver.major == 0x1)
> +               return UFSHCI_VERSION_11;
> +       else
> +               return UFSHCI_VERSION_20;

Btw, UFS driver currently lacks UFSHCI 2.0 support.  Shouldn't we also
need a change like the patch submitted by Chuanxiao Dong:

http://marc.info/?l=linux-scsi&m=140688020815020&w=2
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