Re: [PATCH v7 3/3] add support for DWC UFS Host Controller

[Joao Pinto <Joao.Pinto@synopsys.com>]

Hi Akinobu,

On 2/13/2016 1:27 PM, Akinobu Mita wrote:
> Hi Joao,
> 
> 2016-02-11 21:13 GMT+09:00 Joao Pinto <Joao.Pinto@synopsys.com>:
>> +static int ufshcd_dwc_connection_setup(struct ufs_hba *hba)
>> +{
>> +       int ret = 0;
>> +
>> +       /* Local side Configuration */
>> +       ret = ufshcd_dme_set(hba, UIC_ARG_MIB(T_CONNECTIONSTATE), 0);
>> +       if (ret)
>> +               goto out;
>> +
>> +       ret = ufshcd_dme_set(hba, UIC_ARG_MIB(N_DEVICEID), 0);
>> +       if (ret)
>> +               goto out;
>> +
>> +       ret = ufshcd_dme_set(hba, UIC_ARG_MIB(N_DEVICEID_VALID), 0);
>> +       if (ret)
>> +               goto out;
>> +
>> +       ret = ufshcd_dme_set(hba, UIC_ARG_MIB(T_PEERDEVICEID), 1);
>> +       if (ret)
>> +               goto out;
>> +
>> +       ret = ufshcd_dme_set(hba, UIC_ARG_MIB(T_PEERCPORTID), 0);
>> +       if (ret)
>> +               goto out;
>> +
>> +       ret = ufshcd_dme_set(hba, UIC_ARG_MIB(T_TRAFFICCLASS), 0);
>> +       if (ret)
>> +               goto out;
>> +
>> +       ret = ufshcd_dme_set(hba, UIC_ARG_MIB(T_CPORTFLAGS), 0x6);
>> +       if (ret)
>> +               goto out;
>> +
>> +       ret = ufshcd_dme_set(hba, UIC_ARG_MIB(T_CPORTMODE), 1);
>> +       if (ret)
>> +               goto out;
>> +
>> +       ret = ufshcd_dme_set(hba, UIC_ARG_MIB(T_CONNECTIONSTATE), 1);
>> +       if (ret)
>> +               goto out;
>> +
>> +
>> +       /* Peer side Configuration */
>> +       ret = ufshcd_dme_peer_set(hba, UIC_ARG_MIB(T_CONNECTIONSTATE), 0);
>> +       if (ret)
>> +               goto out;
>> +
>> +       ret = ufshcd_dme_peer_set(hba, UIC_ARG_MIB(N_DEVICEID), 1);
>> +       if (ret)
>> +               goto out;
>> +
>> +       ret = ufshcd_dme_peer_set(hba, UIC_ARG_MIB(N_DEVICEID_VALID), 1);
>> +       if (ret)
>> +               goto out;
>> +
>> +       ret = ufshcd_dme_peer_set(hba, UIC_ARG_MIB(T_PEERDEVICEID), 1);
>> +       if (ret)
>> +               goto out;
>> +
>> +       ret = ufshcd_dme_peer_set(hba, UIC_ARG_MIB(T_PEERCPORTID), 0);
>> +       if (ret)
>> +               goto out;
>> +
>> +       ret = ufshcd_dme_peer_set(hba, UIC_ARG_MIB(T_TRAFFICCLASS), 0);
>> +       if (ret)
>> +               goto out;
>> +
>> +       ret = ufshcd_dme_peer_set(hba, UIC_ARG_MIB(T_CPORTFLAGS), 0x6);
>> +       if (ret)
>> +               goto out;
>> +
>> +       ret = ufshcd_dme_peer_set(hba, UIC_ARG_MIB(T_CPORTMODE), 1);
>> +       if (ret)
>> +               goto out;
>> +
>> +       ret = ufshcd_dme_peer_set(hba, UIC_ARG_MIB(T_CONNECTIONSTATE), 1);
>> +       if (ret)
>> +               goto out;
>> +
>> +out:
>> +       return ret;
>> +}
> 
> This looks a bit redundant.  The most part of the functions in this file is
> doing ufshcd_dme_set() or ufshcd_dme_peer_set(), so should we
> introduce ufshcd_dme_set_attrs() like below?  It will also increase
> readability.

We can do that, it would make the function body lighter and more easy to read I
agree with you!

> 
> struct ufshcd_dme_attr_val {
>         u32 attr_sel;
>         u32 mib_val;
>         u8 peer;
> };
> 
> int ufshcd_dme_set_attrs(struct ufs_hba *hba,
>                         const struct ufshcd_dme_attr_val *v, int n)
> {
>         for (i = 0; i < n; i++) {
>                 int ret = ufshcd_dme_set_attr(hba, v[i].attr_sel, ...);
> 
>                 if (ret)
>                         return ret;
>         }
>         return 0;
> }
> 
> static int ufshcd_dwc_connection_setup(struct ufs_hba *hba)
> {
>         const struct ufshcd_dme_attr setup_attrs[] = {
>                 { UIC_ARG_MIB(T_CONNECTIONSTATE), 0, DME_LOCAL },
>                 { UIC_ARG_MIB(T_DEVICEID), 0, DME_LOCAL },
>                 ...
>         };
> 
>         return ufshcd_dme_set_attrs(hba, setup_attrs, ARRAY_SIZE(setup_attrs));
> }
> 
>> +static int ufshcd_dwc_setup_tc(struct ufs_hba *hba)
>> +{
>> +       int ret = 0;
>> +
>> +#ifdef CONFIG_SCSI_UFS_DWC_40BIT_RMMI
>> +       dev_info(hba->dev, "Configuring Test Chip 40-bit RMMI");
>> +       ret = ufshcd_dwc_setup_40bit_rmmi(hba);
>> +       if (ret) {
>> +               dev_err(hba->dev, "Configuration failed");
> 
> Please add \n in the end of message.
> (and there are same issues in this file)
> 
>> +
>> +/* Clock Divider Values: Hex equivalent of frequency in MHz */
>> +enum clk_div_values {
>> +       UFSHCD_CLK_DIV_62_5     = 0x3e,
>> +       UFSHCD_CLK_DIV_125      = 0x7d,
>> +       UFSHCD_CLK_DIV_200      = 0xc8,
>> +};
> 
> This is used as register value for DWC_UFS_REG_HCLKDIV.  So should they
> have similar prefix (DWC_UFS_REG_HCLKDIV_*)?

I agree with you, they should have since they are DWC specific.

> 
>> diff --git a/drivers/scsi/ufs/unipro.h b/drivers/scsi/ufs/unipro.h
> 
> ...
> 
>> +/*Other attributes*/
>> +#define VS_MPHYCFGUPDT         0xD085
>> +#define VS_DEBUGOMC            0xD09E
>> +#define VS_POWERSTATE          0xD083
> 
> Are these vendor specific attributes?  If so, please move them to
> ufshci-dwc.h.

These are not DWC specific, that's why I added them to the common unipro.h

> 

Thanks.