Re: [PATCH net v2] stmmac: dwmac-mediatek: fix clock issue

[Matthias Brugger <matthias.bgg@gmail.com>]

On 08/07/2022 09:56, Biao Huang wrote:
> Since clocks are handled in mediatek_dwmac_clks_config(),
> remove the clocks configuration in init()/exit(), and
> invoke mediatek_dwmac_clks_config instead.
> 
> This issue is found in suspend/resume test.
> 
> Fixes: 3186bdad97d5 ("stmmac: dwmac-mediatek: add platform level clocks management")
> Signed-off-by: Biao Huang <biao.huang@mediatek.com>
> ---
>   .../ethernet/stmicro/stmmac/dwmac-mediatek.c  | 32 ++++++-------------
>   1 file changed, 10 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
> index 6ff88df58767..6d82cf2658e0 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
> @@ -576,32 +576,12 @@ static int mediatek_dwmac_init(struct platform_device *pdev, void *priv)
>   		}
>   	}
>   
> -	ret = clk_bulk_prepare_enable(variant->num_clks, plat->clks);
> -	if (ret) {
> -		dev_err(plat->dev, "failed to enable clks, err = %d\n", ret);
> -		return ret;
> -	}
> -
> -	ret = clk_prepare_enable(plat->rmii_internal_clk);
> -	if (ret) {
> -		dev_err(plat->dev, "failed to enable rmii internal clk, err = %d\n", ret);
> -		goto err_clk;
> -	}
> -
>   	return 0;
> -
> -err_clk:
> -	clk_bulk_disable_unprepare(variant->num_clks, plat->clks);
> -	return ret;
>   }
>   
>   static void mediatek_dwmac_exit(struct platform_device *pdev, void *priv)
>   {
> -	struct mediatek_dwmac_plat_data *plat = priv;
> -	const struct mediatek_dwmac_variant *variant = plat->variant;
> -
> -	clk_disable_unprepare(plat->rmii_internal_clk);
> -	clk_bulk_disable_unprepare(variant->num_clks, plat->clks);
> +	/* nothing to do now */

We can just leave the function pointer point to NULL, that get checked before 
calling exit.

Regards,
Matthias

>   }
>   
>   static int mediatek_dwmac_clks_config(void *priv, bool enabled)
> @@ -712,13 +692,21 @@ static int mediatek_dwmac_probe(struct platform_device *pdev)
>   	mediatek_dwmac_common_data(pdev, plat_dat, priv_plat);
>   	mediatek_dwmac_init(pdev, priv_plat);
>   
> +	ret = mediatek_dwmac_clks_config(priv_plat, true);
> +	if (ret)
> +		return ret;
> +
>   	ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
>   	if (ret) {
>   		stmmac_remove_config_dt(pdev, plat_dat);
> -		return ret;
> +		goto err_drv_probe;
>   	}
>   
>   	return 0;
> +
> +err_drv_probe:
> +	mediatek_dwmac_clks_config(priv_plat, false);
> +	return ret;
>   }
>   
>   static const struct of_device_id mediatek_dwmac_match[] = {