linux-kernel - Re: [PATCH v1] PCI: tegra: Enable root port specific features

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Date:	Tue, 07 Oct 2014 08:44:05 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Vidya Sagar <vidyas@...dia.com>, thierry.reding@...il.com,
	bhelgaas@...gle.com
CC:	kthota@...dia.com, linux-tegra@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] PCI: tegra: Enable root port specific features

On 10/07/2014 03:27 AM, Vidya Sagar wrote:
> Enables root port to advertise its ASPM-L1 capability
>  resulting in possible link entry to L1 when an ASPM-L1 capable
>  device is connected
> Enables per-controller & per-TMS clock clamping by default
> Enabling above features result in more power saving
> 
> It also avoids PM message truncation by waiting for DLLP to finish
> before entering into L1 or L2
> 
> Also, it adds helper functions to access root port registers

> diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c

> @@ -1870,8 +1920,10 @@ static int tegra_pcie_enable(struct tegra_pcie *pcie)
>  
>  		tegra_pcie_port_enable(port);
>  
> -		if (tegra_pcie_port_check_link(port))
> +		if (tegra_pcie_port_check_link(port)) {
> +			tegra_pcie_enable_rp_features(port);
>  			continue;
> +		}
>  
>  		dev_info(pcie->dev, "link %u down, ignoring\n", port->index);

Wouldn't it be better to have the error case inside the if block; most
error-handling is that way. For example:

if (!tegra_pcie_port_check_link(port)) {
	dev_info(pcie->dev, "link %u down, ignoring\n", port->index);
	tegra_pcie_port_disable(port);
	tegra_pcie_port_free(port);
	continue;
}

tegra_pcie_enable_rp_features(port);
... any other "good case" code (of which there admittedly is none at
present)
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