linux-kernel - Re: [PATCH v3 18/18] PCI: j721e: add suspend and resume support

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Date: Thu, 15 Feb 2024 17:51:09 +0200
From: Andy Shevchenko <andy@...nel.org>
To: Thomas Richard <thomas.richard@...tlin.com>
Cc: Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Tony Lindgren <tony@...mide.com>,
	Haojian Zhuang <haojian.zhuang@...aro.org>,
	Vignesh R <vigneshr@...com>, Aaro Koskinen <aaro.koskinen@....fi>,
	Janusz Krzysztofik <jmkrzyszt@...il.com>,
	Andi Shyti <andi.shyti@...nel.org>, Peter Rosin <peda@...ntia.se>,
	Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
	linux-i2c@...r.kernel.org, linux-phy@...ts.infradead.org,
	linux-pci@...r.kernel.org, gregory.clement@...tlin.com,
	theo.lebrun@...tlin.com, thomas.petazzoni@...tlin.com,
	u-kumar1@...com
Subject: Re: [PATCH v3 18/18] PCI: j721e: add suspend and resume support

On Thu, Feb 15, 2024 at 04:18:03PM +0100, Thomas Richard wrote:
> From: Théo Lebrun <theo.lebrun@...tlin.com>
> 
> Add suspend and resume support. Only the rc mode is supported.
> 
> During the suspend stage PERST# is asserted, then deasserted during the
> resume stage.

..

> +#include <linux/clk-provider.h>
>  #include <linux/clk.h>
>  #include <linux/delay.h>
>  #include <linux/gpio/consumer.h>
> @@ -18,10 +19,13 @@
>  #include <linux/platform_device.h>
>  #include <linux/pm_runtime.h>
>  #include <linux/regmap.h>

> +#include <linux/container_of.h>

Unordered.

..

> +	ret = j721e_pcie_ctrl_init(pcie);
> +	if (ret < 0) {
> +		dev_err(dev, "j721e_pcie_ctrl_init failed\n");

Is there any guarantee this won't spam logs?

> +		return ret;
> +	}

..

> +	/*
> +	 * This is not called explicitly in the probe, it is called by
> +	 * cdns_pcie_init_phy.

cdns_pcie_init_phy()

> +	 */
> +	ret = cdns_pcie_enable_phy(pcie->cdns_pcie);
> +	if (ret < 0) {
> +		dev_err(dev, "cdns_pcie_enable_phy failed\n");
> +		return -ENODEV;

A potential log spammer?

> +	}

> +	if (pcie->mode == PCI_MODE_RC) {
> +		struct cdns_pcie_rc *rc = cdns_pcie_to_rc(cdns_pcie);
> +
> +		ret = clk_prepare_enable(pcie->refclk);
> +		if (ret < 0) {
> +			dev_err(dev, "clk_prepare_enable failed\n");

Ditto.

> +			return -ENODEV;

Why is the error code shadowed?

> +		}

..

> +		if (pcie->reset_gpio) {
> +			usleep_range(100, 200);

fsleep()

> +			gpiod_set_value_cansleep(pcie->reset_gpio, 1);
> +		}

> +		ret = cdns_pcie_host_link_setup(rc);
> +		if (ret < 0) {
> +			clk_disable_unprepare(pcie->refclk);
> +			return ret;
> +		}
> +
> +		/*
> +		 * Reset internal status of BARs to force reinitialization in
> +		 * cdns_pcie_host_init().
> +		 */
> +		for (enum cdns_pcie_rp_bar bar = RP_BAR0; bar <= RP_NO_BAR; bar++)
> +			rc->avail_ib_bar[bar] = true;
> +
> +		ret = cdns_pcie_host_init(rc);
> +		if (ret)

No clock disabling?

> +			return ret;
> +	}


-- 
With Best Regards,
Andy Shevchenko