linux-kernel - Re: [PATCH 1/1] scsi: ufs: Generalize UFS Interconnect Layer (UIC) command support

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Message-ID: <CALMYJDtE=GnETSi7KfLCWWqow3Let3Q5aL70ei3MkJKH6FWzFg@mail.gmail.com>
Date:	Thu, 2 May 2013 12:49:57 +0530
From:	Santosh Y <santoshsy@...il.com>
To:	Sujit Reddy Thumma <sthumma@...eaurora.org>
Cc:	Vinayak Holikatti <vinholikatti@...il.com>,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	linux-arm-msm@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] scsi: ufs: Generalize UFS Interconnect Layer (UIC)
 command support

> -static inline void
> -ufshcd_send_uic_command(struct ufs_hba *hba, struct uic_command *uic_cmnd)
> +static int ufshcd_send_uic_command(struct ufs_hba *hba,
> +               struct uic_command *uic_cmnd, int retries)
>  {
> +       int err = 0;
> +       unsigned long flags;
> +
> +       if (unlikely(mutex_trylock(&hba->uic_cmd_mutex))) {
> +               mutex_unlock(&hba->uic_cmd_mutex);
> +               dev_err(hba->dev, "%s: called without prepare command\n",
> +                               __func__);
> +               BUG();
> +       }
> +
> +retry:
> +       /* check if controller is ready to accept UIC commands */
> +       if (!(readl(hba->mmio_base + REG_CONTROLLER_STATUS) &
> +                               UIC_COMMAND_READY)) {
> +               dev_err(hba->dev, "Controller not ready to accept UIC commands\n");
> +               err = -EIO;
> +               goto out;
> +       }
> +
> +       init_completion(&uic_cmnd->completion);
> +
> +       spin_lock_irqsave(hba->host->host_lock, flags);
> +
> +       /* enable UIC related interrupts */
> +       if (!(hba->int_enable_mask & UIC_COMMAND_COMPL)) {
> +               hba->int_enable_mask |= UIC_COMMAND_COMPL;
> +               ufshcd_int_config(hba, UFSHCD_INT_ENABLE);
> +       }
> +

No need to check if the interrupt is already enabled, it can be
directly enabled.


>         /* Write Args */
>         writel(uic_cmnd->argument1,
>               (hba->mmio_base + REG_UIC_COMMAND_ARG_1));
> @@ -415,6 +491,45 @@ ufshcd_send_uic_command(struct ufs_hba *hba, struct uic_command *uic_cmnd)
>         /* Write UIC Cmd */
>         writel((uic_cmnd->command & COMMAND_OPCODE_MASK),
>                (hba->mmio_base + REG_UIC_COMMAND));
> +
> +       /* flush to make sure h/w sees the write */
> +       readl(hba->mmio_base + REG_UIC_COMMAND);
> +
> +       spin_unlock_irqrestore(hba->host->host_lock, flags);
> +

mutex lock/unlock can be done in the send_uic_command, It will
simplify the process for the caller.

> +       err = wait_for_completion_timeout(
> +                       &uic_cmnd->completion, UIC_COMMAND_TIMEOUT);
> +       if (!err) {
> +               err = -ETIMEDOUT;
> +       } else if (uic_cmnd->argument2 & MASK_UIC_COMMAND_RESULT) {
> +               /* something bad with h/w or arguments, try again */
> +               if (--retries)
> +                       goto retry;
> +

-- 
~Santosh
--
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