Re: [PATCH v2] clk: Warn about critical clks that fail to enable

[Guenter Roeck]

On 1/1/20 4:55 PM, Stephen Boyd wrote:
> If we don't warn here users of the CLK_IS_CRITICAL flag may not know
> that their clk isn't actually enabled because it silently fails to
> enable. Let's print a warning in that case so developers find these
> problems faster.
>
> Suggested-by: Jerome Brunet <jbrunet@xxxxxxxxxxxx>
> Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
> Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxx>

Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>

> ---
>
> Changes from v1:
>   * Switched to pr_warn and indicated clk name
>
>   drivers/clk/clk.c | 7 ++++++-
>   1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index 772258de2d1f..b03c2be4014b 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -3427,13 +3427,18 @@ static int __clk_core_init(struct clk_core *core)
>   		unsigned long flags;
>   
>   		ret = clk_core_prepare(core);
> -		if (ret)
> +		if (ret) {
> +			pr_warn("%s: critical clk '%s' failed to prepare\n",
> +			       __func__, core->name);
>   			goto out;
> +		}
>   
>   		flags = clk_enable_lock();
>   		ret = clk_core_enable(core);
>   		clk_enable_unlock(flags);
>   		if (ret) {
> +			pr_warn("%s: critical clk '%s' failed to enable\n",
> +			       __func__, core->name);
>   			clk_core_unprepare(core);
>   			goto out;
>   		}
>
> base-commit: 12ead77432f2ce32dea797742316d15c5800cb32