linux-kernel - Re: [PATCH v3 1/1] scsi: ufs: make UFS Tx lane1 clock optional for QCOM platforms

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Message-ID: <CAD=FV=WjO9YvKHDiEDt8+8TJ_JjnzcVAqB99nhP5LwnWO0fuLw@mail.gmail.com>
Date:   Fri, 12 Oct 2018 09:55:19 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     cang@...eaurora.org
Cc:     subhashj@...eaurora.org, Asutosh Das <asutoshd@...eaurora.org>,
        Vivek Gautam <vivek.gautam@...eaurora.org>,
        Evan Green <evgreen@...omium.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Vinayak Holikatti <vinholikatti@...il.com>,
        jejb@...ux.vnet.ibm.com,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        venkatg@...eaurora.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/1] scsi: ufs: make UFS Tx lane1 clock optional for
 QCOM platforms

Hi,

On Thu, Oct 11, 2018 at 6:12 PM Can Guo <cang@...eaurora.org> wrote:
> +       if (err != -EPROBE_DEFER)
> +               dev_err(dev, "failed to get %s err %d",
> +                               name, err);

I wouldn't spin just for this, but if you spin for some other reason
you could move the above "dev_err" onto one line now.  Sorry: I should
have noticed that / done that on my patch...

> @@ -141,24 +147,21 @@ static int ufs_qcom_enable_lane_clks(struct ufs_qcom_host *host)

Idea for a future patch: now that I look at what's left of this
function you're basically re-implementing clk_bulk_prepare_enable()
and clk_bulk_disable_unprepare() now.  I bet your code would be
cleaner / nicer by switching to that.

...possibly you might need to improve the clk_bulk_get() API to allow
for some clock to be optional, but that would be a pretty easy patch
to post up.

In any case I think it's better to do the clk_bulk switch in a future
/ separate patch, so:

Reviewed-by: Douglas Anderson <dianders@...omium.org>
Tested-by: Douglas Anderson <dianders@...omium.org>

-Doug