linux-kernel - Re: [PATCH 07/10] scsi: ufs: add add specific callback for hibern8

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Date:	Wed, 26 Aug 2015 11:51:44 +0530
From:	amit daniel kachhap <amit.daniel@...sung.com>
To:	Alim Akhtar <alim.akhtar@...sung.com>
Cc:	linux-scsi@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	vinholikatti@...il.com, JBottomley@...n.com,
	Seungwon Jeon <tgih.jun@...sung.com>
Subject: Re: [PATCH 07/10] scsi: ufs: add add specific callback for hibern8

On Fri, Aug 21, 2015 at 2:57 PM, Alim Akhtar <alim.akhtar@...sung.com> wrote:
> From: Seungwon Jeon <tgih.jun@...sung.com>
>
> Some host controller needs specific handling before/after
> (un)hibernation, This change adds specific callback function
> to support vendor's implementation.
>
> Signed-off-by: Seungwon Jeon <tgih.jun@...sung.com>
> Signed-off-by: Alim Akhtar <alim.akhtar@...sung.com>
> ---
>  drivers/scsi/ufs/ufshcd.c |   36 ++++++++++++++++++++++++++++++++----
>  drivers/scsi/ufs/ufshcd.h |    3 +++
>  2 files changed, 35 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index bc27f5e..d425ea1 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -181,8 +181,7 @@ static int ufshcd_probe_hba(struct ufs_hba *hba);
>  static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
>                                  bool skip_ref_clk);
>  static int ufshcd_setup_clocks(struct ufs_hba *hba, bool on);
> -static int ufshcd_uic_hibern8_exit(struct ufs_hba *hba);
> -static int ufshcd_uic_hibern8_enter(struct ufs_hba *hba);
> +static int ufshcd_uic_hibern8_ctrl(struct ufs_hba *hba, bool en);
>  static inline void ufshcd_add_delay_before_dme_cmd(struct ufs_hba *hba);
>  static int ufshcd_host_reset_and_restore(struct ufs_hba *hba);
>  static irqreturn_t ufshcd_intr(int irq, void *__hba);
> @@ -215,6 +214,16 @@ static inline void ufshcd_disable_irq(struct ufs_hba *hba)
>         }
>  }
>
> +static inline int ufshcd_uic_hibern8_enter(struct ufs_hba *hba)
> +{
> +       return ufshcd_uic_hibern8_ctrl(hba, true);
> +}
> +
> +static inline int ufshcd_uic_hibern8_exit(struct ufs_hba *hba)
> +{
> +       return ufshcd_uic_hibern8_ctrl(hba, false);
> +}
> +
>  /*
>   * ufshcd_wait_for_register - wait for register value to change
>   * @hba - per-adapter interface
> @@ -2395,7 +2404,7 @@ out:
>         return ret;
>  }
>
> -static int ufshcd_uic_hibern8_enter(struct ufs_hba *hba)
> +static int __ufshcd_uic_hibern8_enter(struct ufs_hba *hba)
>  {
>         struct uic_command uic_cmd = {0};
>
> @@ -2404,7 +2413,7 @@ static int ufshcd_uic_hibern8_enter(struct ufs_hba *hba)
>         return ufshcd_uic_pwr_ctrl(hba, &uic_cmd);
>  }
>
> -static int ufshcd_uic_hibern8_exit(struct ufs_hba *hba)
> +static int __ufshcd_uic_hibern8_exit(struct ufs_hba *hba)
>  {
>         struct uic_command uic_cmd = {0};
>         int ret;
> @@ -2419,6 +2428,25 @@ static int ufshcd_uic_hibern8_exit(struct ufs_hba *hba)
>         return ret;
>  }
>
> +static int ufshcd_uic_hibern8_ctrl(struct ufs_hba *hba, bool en)
> +{
> +       int ret;
> +
> +       if (hba->vops && hba->vops->hibern8_notify)
> +               hba->vops->hibern8_notify(hba, en, PRE_CHANGE);
Return of hibern8_notify is not checked. Otherwise make the return type void.
> +
> +       ret = en ? __ufshcd_uic_hibern8_enter(hba) :
> +                       __ufshcd_uic_hibern8_exit(hba);
> +       if (ret)
> +               goto out;
> +
> +       if (hba->vops && hba->vops->hibern8_notify)
> +               hba->vops->hibern8_notify(hba, en, POST_CHANGE);
> +
> +out:
> +       return ret;
> +}
> +
>   /**
>   * ufshcd_init_pwr_info - setting the POR (power on reset)
>   * values in hba power info
> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
> index 0b7dde0..045968e 100644
> --- a/drivers/scsi/ufs/ufshcd.h
> +++ b/drivers/scsi/ufs/ufshcd.h
> @@ -260,6 +260,8 @@ struct ufs_pwr_mode_info {
>   * @specify_nexus_t_xfer_req:
>   * @specify_nexus_t_tm_req: called before command is issued to allow vendor
>   *                     specific handling to be set for nexus type.
> + * @hibern8_notify: called before and after hibernate/unhibernate is carried out
> + *                 to allow vendor spesific implementation.
>   * @suspend: called during host controller PM callback
>   * @resume: called during host controller PM callback
>   */
> @@ -276,6 +278,7 @@ struct ufs_hba_variant_ops {
>         int     (*pwr_change_notify)(struct ufs_hba *,
>                                         bool, struct ufs_pa_layer_attr *,
>                                         struct ufs_pa_layer_attr *);
> +       int     (*hibern8_notify)(struct ufs_hba *, bool, bool);
>         void    (*specify_nexus_t_xfer_req)(struct ufs_hba *,
>                                             int, struct scsi_cmnd *);
>         void    (*specify_nexus_t_tm_req)(struct ufs_hba *, int, u8);
> --
> 1.7.10.4
>
> --
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