netdev - Re: [PATCH net v4 1/3] stmmac: dwmac-mediatek: fix clock issue

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Message-ID: <c8fdfa7b-f4eb-8308-4064-b868ce945e3a@gmail.com>
Date:   Wed, 13 Jul 2022 14:11:39 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Biao Huang <biao.huang@...iatek.com>,
        David Miller <davem@...emloft.net>
Cc:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>, netdev@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, macpaul.lin@...iatek.com,
        Jisheng Zhang <jszhang@...nel.org>,
        Mohammad Athari Bin Ismail <mohammad.athari.ismail@...el.com>
Subject: Re: [PATCH net v4 1/3] stmmac: dwmac-mediatek: fix clock issue



On 13/07/2022 12:10, Biao Huang wrote:
> The pm_runtime takes care of the clock handling in current
> stmmac drivers, and dwmac-mediatek implement the
> mediatek_dwmac_clks_config() as the callback for pm_runtime.
> 
> Then, stripping duplicated clocks handling in old init()/exit()
> to fix clock issue in suspend/resume test.
> 
> As to clocks in probe/remove, vendor need symmetric handling to
> ensure clocks balance.
> 
> Test pass, including suspend/resume and ko insertion/remove.
> 
> Fixes: 3186bdad97d5 ("stmmac: dwmac-mediatek: add platform level clocks management")
> Signed-off-by: Biao Huang <biao.huang@...iatek.com>
> ---
>   .../ethernet/stmicro/stmmac/dwmac-mediatek.c  | 49 ++++++++-----------
>   1 file changed, 21 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
> index 6ff88df58767..ca8ab290013c 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
> @@ -576,32 +576,7 @@ 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);
>   }
>   
>   static int mediatek_dwmac_clks_config(void *priv, bool enabled)
> @@ -643,7 +618,6 @@ static int mediatek_dwmac_common_data(struct platform_device *pdev,
>   	plat->addr64 = priv_plat->variant->dma_bit_mask;
>   	plat->bsp_priv = priv_plat;
>   	plat->init = mediatek_dwmac_init;
> -	plat->exit = mediatek_dwmac_exit;
>   	plat->clks_config = mediatek_dwmac_clks_config;
>   	if (priv_plat->variant->dwmac_fix_mac_speed)
>   		plat->fix_mac_speed = priv_plat->variant->dwmac_fix_mac_speed;
> @@ -712,13 +686,32 @@ 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 int mediatek_dwmac_remove(struct platform_device *pdev)
> +{
> +	struct mediatek_dwmac_plat_data *priv_plat = get_stmmac_bsp_priv(&pdev->dev);
> +	int ret;
> +
> +	ret = stmmac_pltfr_remove(pdev);
> +	mediatek_dwmac_clks_config(priv_plat, false);
> +

We enalbe the clocks after calling stmmac_probe_config_dt(), so we should 
disable them before calling stmmac_pltfr_remove(), correct?

Other then that:
Reviewed-by: Matthias Brugger <matthias.bgg@...il.com>

> +	return ret;
>   }
>   
>   static const struct of_device_id mediatek_dwmac_match[] = {
> @@ -733,7 +726,7 @@ MODULE_DEVICE_TABLE(of, mediatek_dwmac_match);
>   
>   static struct platform_driver mediatek_dwmac_driver = {
>   	.probe  = mediatek_dwmac_probe,
> -	.remove = stmmac_pltfr_remove,
> +	.remove = mediatek_dwmac_remove,
>   	.driver = {
>   		.name           = "dwmac-mediatek",
>   		.pm		= &stmmac_pltfr_pm_ops,