linux-kernel - Re: [PATCH v2 3/3] soc: aspeed: lpc-pcc: Add PCC controller support

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Message-ID: <2fd83d68-7104-4755-a0f0-8ce4a2601e09@kernel.org>
Date: Tue, 4 Mar 2025 11:59:08 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Kevin Chen <kevin_chen@...eedtech.com>, lee@...nel.org, robh@...nel.org,
 krzk+dt@...nel.org, conor+dt@...nel.org, joel@....id.au,
 andrew@...econstruct.com.au, derek.kiernan@....com, dragan.cvetic@....com,
 arnd@...db.de, gregkh@...uxfoundation.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-aspeed@...ts.ozlabs.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] soc: aspeed: lpc-pcc: Add PCC controller support

On 04/03/2025 11:44, Kevin Chen wrote:
> +
> +static int aspeed_pcc_probe(struct platform_device *pdev)
> +{
> +	int rc;
> +	struct aspeed_pcc_ctrl *pcc;
> +	struct device *dev;
> +	uint32_t fifo_size = PAGE_SIZE;
> +
> +	dev = &pdev->dev;

This goes to declaration.

> +
> +	pcc = devm_kzalloc(&pdev->dev, sizeof(*pcc), GFP_KERNEL);

Maybe my previous comment was not clear, but you agreed with it. Anyway
nothing improved here.

If you have 'dev' variable, use it.

> +	if (!pcc)
> +		return -ENOMEM;
> +
> +	pcc->regmap = syscon_node_to_regmap(pdev->dev.parent->of_node);

same here and everywhere else.

> +	if (IS_ERR(pcc->regmap)) {
> +		dev_err(dev, "Couldn't get regmap\n");
> +		return -ENODEV;
> +	}
> +
> +	rc = of_property_read_u32(dev->of_node, "pcc-ports", &pcc->port);
> +	if (rc) {
> +		dev_err(dev, "no pcc ports configured\n");
> +		return -ENODEV;
> +	}
> +
> +	rc = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
> +	if (rc) {
> +		dev_err(dev, "cannot set 64-bits DMA mask\n");
> +		return rc;
> +	}
> +
> +	pcc->dma.size = PCC_DMA_BUFSZ;
> +	pcc->dma.virt = dmam_alloc_coherent(dev,
> +					    pcc->dma.size,
> +					    &pcc->dma.addr,
> +					    GFP_KERNEL);
> +	if (!pcc->dma.virt) {
> +		dev_err(dev, "cannot allocate DMA buffer\n");
> +		return -ENOMEM;
> +	}
> +
> +	fifo_size = roundup(pcc->dma.size, PAGE_SIZE);
> +	rc = kfifo_alloc(&pcc->fifo, fifo_size, GFP_KERNEL);
> +	if (rc) {
> +		dev_err(dev, "cannot allocate kFIFO\n");

Drop

> +		return -ENOMEM;
> +	}
> +
> +	/* Disable PCC to clean up DMA buffer before request IRQ. */
> +	rc = aspeed_pcc_disable(pcc);
> +	if (rc) {
> +		dev_err(dev, "Couldn't disable PCC\n");
> +		goto err_free_kfifo;
> +	}
> +
> +	pcc->irq = platform_get_irq(pdev, 0);
> +	if (pcc->irq < 0) {
> +		dev_err(dev, "Couldn't get IRQ\n");

Drop, core already prints this. Do not duplicate messages.

> +		rc = -ENODEV;

Why not using pcc->irq as rc?

> +		goto err_free_kfifo;
> +	}
> +
Best regards,
Krzysztof