linux-kernel - Re: [PATCH 3/4] memory: mtk-smi: mt8188: Add SMI clamp function

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Message-ID: <25b487b7-63e0-402d-a0a2-ed9d03e82630@kernel.org>
Date: Wed, 21 Aug 2024 11:00:56 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: "friday.yang" <friday.yang@...iatek.com>, Rob Herring <robh@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Matthias Brugger
 <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: Yong Wu <yong.wu@...iatek.com>, Philipp Zabel <p.zabel@...gutronix.de>,
 linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH 3/4] memory: mtk-smi: mt8188: Add SMI clamp function

On 21/08/2024 10:26, friday.yang wrote:
> In order to avoid handling glitch signal when MTCMOS on/off, SMI need
> clamp and reset operation. Parse power reset settings for LARBs which
> need to reset. Register genpd callback for SMI LARBs and apply reset
> operations in the callback.
> 
> Signed-off-by: friday.yang <friday.yang@...iatek.com>
> ---
>  drivers/memory/mtk-smi.c | 148 ++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 146 insertions(+), 2 deletions(-)
> 

...

> +
> +static int mtk_smi_larb_parse_reset_info(struct mtk_smi_larb *larb)
> +{
> +	struct device_node *reset_node;
> +	struct device *dev = larb->dev;
> +	int ret;
> +
> +	/* only larb with "resets" need to get reset setting */
> +	reset_node = of_parse_phandle(dev->of_node, "resets", 0);

Nope, you do not parse rasets.

> +	if (!reset_node)
> +		return 0;
> +	of_node_put(reset_node);
> +
> +	larb->rst_con = devm_reset_control_get(dev, "larb_rst");

Where are the bindings? Why do you add undocumented properties? How
possible this passes dtbs_check???


> +	if (IS_ERR(larb->rst_con))
> +		return dev_err_probe(dev, PTR_ERR(larb->rst_con),
> +				     "cannot get larb reset controller\n");
> +
> +	larb->nb.notifier_call = mtk_smi_genpd_callback;
> +	ret = dev_pm_genpd_add_notifier(dev, &larb->nb);
> +	if (ret) {
> +		dev_err(dev, "Failed to add genpd callback %d\n", ret);
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
>  static int mtk_smi_larb_probe(struct platform_device *pdev)
>  {
>  	struct mtk_smi_larb *larb;
> @@ -538,6 +662,7 @@ static int mtk_smi_larb_probe(struct platform_device *pdev)
>  	if (!larb)
>  		return -ENOMEM;
>  
> +	larb->dev = dev;
>  	larb->larb_gen = of_device_get_match_data(dev);
>  	larb->base = devm_platform_ioremap_resource(pdev, 0);
>  	if (IS_ERR(larb->base))
> @@ -554,15 +679,29 @@ static int mtk_smi_larb_probe(struct platform_device *pdev)
>  	if (ret < 0)
>  		return ret;
>  
> -	pm_runtime_enable(dev);
> +	/* find sub common to clamp larb for ISP software reset */
> +	ret = mtk_smi_larb_parse_clamp_info(larb);
> +	if (ret) {
> +		dev_err(dev, "Failed to get clamp setting for larb\n");
> +		goto err_pm_disable;
> +	}
> +
> +	ret = mtk_smi_larb_parse_reset_info(larb);
> +	if (ret) {
> +		dev_err(dev, "Failed to get power setting for larb\n");
> +		goto err_pm_disable;
> +	}
> +
>  	platform_set_drvdata(pdev, larb);
>  	ret = component_add(dev, &mtk_smi_larb_component_ops);
>  	if (ret)
>  		goto err_pm_disable;
> +
> +	pm_runtime_enable(dev);
> +
>  	return 0;
>  
>  err_pm_disable:
> -	pm_runtime_disable(dev);
>  	device_link_remove(dev, larb->smi_common_dev);

Label asls pm disable. Where is the pm disable?

>  	return ret;
>  }
> @@ -686,6 +825,10 @@ static const struct mtk_smi_common_plat mtk_smi_common_mt8188_vpp = {
>  	.init     = mtk_smi_common_mt8195_init,
>  };

Best regards,
Krzysztof