linux-kernel - Re: [PATCH 2/4] clk: tegra: check BPMP response return code

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Date:   Tue, 17 Oct 2017 12:37:36 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>
Cc:     Timo Alho <talho@...dia.com>, linux-clk@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] clk: tegra: check BPMP response return code

On Thu, Sep 07, 2017 at 12:31:02PM +0300, Timo Alho wrote:
> Check return code in BPMP response message(s). The typical error case
> is when clock operation is attempted with invalid clock identifier.
> 
> Also remove error print from call to clk_get_info() as the
> implementation loops through range of all possible identifier, but the
> operation is expected error out when the clock id is unused.
> 
> Signed-off-by: Timo Alho <talho@...dia.com>
> ---
>  drivers/clk/tegra/clk-bpmp.c | 15 ++++++++++-----
>  1 file changed, 10 insertions(+), 5 deletions(-)

Hi Mike, Stephen,

do you mind if I pick this up into the Tegra tree? It has a build
dependency on patch 1/4.

I only now realized that you guys weren't on Cc, hence quoting in
full.

Thierry

> diff --git a/drivers/clk/tegra/clk-bpmp.c b/drivers/clk/tegra/clk-bpmp.c
> index 638ace6..a896692 100644
> --- a/drivers/clk/tegra/clk-bpmp.c
> +++ b/drivers/clk/tegra/clk-bpmp.c
> @@ -55,6 +55,7 @@ struct tegra_bpmp_clk_message {
>  	struct {
>  		void *data;
>  		size_t size;
> +		int ret;
>  	} rx;
>  };
>  
> @@ -64,6 +65,7 @@ static int tegra_bpmp_clk_transfer(struct tegra_bpmp *bpmp,
>  	struct mrq_clk_request request;
>  	struct tegra_bpmp_message msg;
>  	void *req = &request;
> +	int err;
>  
>  	memset(&request, 0, sizeof(request));
>  	request.cmd_and_id = (clk->cmd << 24) | clk->id;
> @@ -84,7 +86,13 @@ static int tegra_bpmp_clk_transfer(struct tegra_bpmp *bpmp,
>  	msg.rx.data = clk->rx.data;
>  	msg.rx.size = clk->rx.size;
>  
> -	return tegra_bpmp_transfer(bpmp, &msg);
> +	err = tegra_bpmp_transfer(bpmp, &msg);
> +	if (err < 0)
> +		return err;
> +	else if (msg.rx.ret < 0)
> +		return -EINVAL;
> +
> +	return 0;
>  }
>  
>  static int tegra_bpmp_clk_prepare(struct clk_hw *hw)
> @@ -414,11 +422,8 @@ static int tegra_bpmp_probe_clocks(struct tegra_bpmp *bpmp,
>  		struct tegra_bpmp_clk_info *info = &clocks[count];
>  
>  		err = tegra_bpmp_clk_get_info(bpmp, id, info);
> -		if (err < 0) {
> -			dev_err(bpmp->dev, "failed to query clock %u: %d\n",
> -				id, err);
> +		if (err < 0)
>  			continue;
> -		}
>  
>  		if (info->num_parents >= U8_MAX) {
>  			dev_err(bpmp->dev,
> -- 
> 2.7.4
> 

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