linux-kernel - Re: [PATCH V2 2/2] clk: imx8m: check mcore

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Date:   Tue, 12 Apr 2022 11:11:17 +0300
From:   Abel Vesa <abel.vesa@....com>
To:     "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc:     sboyd@...nel.org, shawnguo@...nel.org, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Peng Fan <peng.fan@....com>
Subject: Re: [PATCH V2 2/2] clk: imx8m: check mcore_booted before register clk

On 22-02-28 20:41:12, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@....com>
>
> If mcore_booted is true, ignore the clk root gate registration and
> this will simplify AMP clock management and avoid system hang unexpectly
> especially Linux shutdown clk used by mcore.
>
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>
> V2:
>  None
>
>  drivers/clk/imx/clk-composite-8m.c | 21 +++++++++++++--------
>  1 file changed, 13 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/clk/imx/clk-composite-8m.c b/drivers/clk/imx/clk-composite-8m.c
> index 2dfd6149e528..b16c2c0ea9f6 100644
> --- a/drivers/clk/imx/clk-composite-8m.c
> +++ b/drivers/clk/imx/clk-composite-8m.c
> @@ -223,14 +223,19 @@ struct clk_hw *__imx8m_clk_hw_composite(const char *name,
>  	div->lock = &imx_ccm_lock;
>  	div->flags = CLK_DIVIDER_ROUND_CLOSEST;
>
> -	gate = kzalloc(sizeof(*gate), GFP_KERNEL);
> -	if (!gate)
> -		goto fail;
> -
> -	gate_hw = &gate->hw;
> -	gate->reg = reg;
> -	gate->bit_idx = PCG_CGC_SHIFT;
> -	gate->lock = &imx_ccm_lock;
> +	/* skip registering the gate ops if M4 is enabled */
> +	if (mcore_booted) {
> +		gate_hw = NULL;

Lets have the gate_hw set to NULL when declared and get rid of this if
case.

> +	} else {

And then lets do here:

	if (!mcore_booted) {
> +		gate = kzalloc(sizeof(*gate), GFP_KERNEL);
> +		if (!gate)
> +			goto fail;
> +
> +		gate_hw = &gate->hw;
> +		gate->reg = reg;
> +		gate->bit_idx = PCG_CGC_SHIFT;
> +		gate->lock = &imx_ccm_lock;
> +	}
>

Would look a bit cleaner this way.

With that done:

Reviewed-by: Abel Vesa <abel.vesa@....com>

>  	hw = clk_hw_register_composite(NULL, name, parent_names, num_parents,
>  			mux_hw, mux_ops, div_hw,
> --
> 2.25.1
>