linux-kernel - Re: [PATCH v1] PCI: enable ASPM configuration in PCIE POWERSAVE mode

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Date:	Tue, 01 Jul 2014 09:04:53 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Vidya Sagar <vidyas@...dia.com>, bhelgaas@...gle.com, rjw@...k.pl,
	nagananda.chumbalkar@...com, thierry.reding@...il.com,
	swarren@...dia.com, kthota@...dia.com, linux-pci@...r.kernel.org
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] PCI: enable ASPM configuration in PCIE POWERSAVE mode

On 07/01/2014 01:16 AM, Vidya Sagar wrote:
> commit 1a680b7c moved pcie_aspm_powersave_config_link() out of
> pci_raw_set_power_state() to pci_set_power_state() which would enable
> ASPM. But, with commit db288c9c, which re-introduced the following check
> ./drivers/pci/pci.c: pci_set_power_state()
> +   /* Check if we're already there */
> +   if (dev->current_state == state)
> +       return 0;
> in pci_set_power_state(), call to pcie_aspm_powersave_config_link() is never
> made leaving ASPM broken.
> Fix it by not returning from when the above condition is true, rather, jump to
> ASPM configuration code and exit from there eventually.

Out of curiosity, was this patch tested by running an umodified mainline
kernel on a Tegra device, or is this simply a port from our downstream
kernel, without any additional upstream testing?
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