linux-kernel - Re: [PATCH 2/2] soc: qcom: ipcc: Add support for IPCC controller

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Date:   Wed, 29 Apr 2020 23:45:27 -0700
From:   rananta@...eaurora.org
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     agross@...nel.org, bjorn.andersson@...aro.org, robh+dt@...nel.org,
        jassisinghbrar@...il.com, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Venkata Narendra Kumar Gutta <vnkgutta@...eaurora.org>
Subject: Re: [PATCH 2/2] soc: qcom: ipcc: Add support for IPCC controller

On 2020-04-29 23:30, Manivannan Sadhasivam wrote:
> +static int qcom_ipcc_probe(struct platform_device *pdev)
> +{
> +	struct qcom_ipcc_proto_data *proto_data;
> +	int ret;
> +
> +	proto_data = devm_kzalloc(&pdev->dev, sizeof(*proto_data), 
> GFP_KERNEL);
> +	if (!proto_data)
> +		return -ENOMEM;
> +
> +	ipcc_proto_data = proto_data;
> +	proto_data->dev = &pdev->dev;
> +
> +	proto_data->base = devm_platform_ioremap_resource(pdev, 0);
> +	if (IS_ERR(proto_data->base)) {
> +		dev_err(&pdev->dev, "Failed to ioremap the ipcc base addr\n");
> +		return PTR_ERR(proto_data->base);
> +	}
> +
> +	proto_data->irq = platform_get_irq(pdev, 0);
> +	if (proto_data->irq < 0) {
> +		dev_err(&pdev->dev, "Failed to get the IRQ\n");
> +		return proto_data->irq;
> +	}
> +
> +	/* Perform a SW reset on this client's protocol state */
> +	writel(0x1, proto_data->base + IPCC_REG_CLIENT_CLEAR);
We can skip doing a SW reset here. Few of the subsystems may be brought 
out of reset via the bootloader and the interrupts from them might be 
pending. Doing a SW reset here would clear those interrupts.

Thank you.
Raghavendra