linux-kernel - Re: [PATCH v6 00/15] Tegra XHCI controller ELPG support

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Date:   Tue, 19 Jan 2021 15:07:26 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     JC Kuo <jckuo@...dia.com>
Cc:     gregkh@...uxfoundation.org, robh@...nel.org, jonathanh@...dia.com,
        kishon@...com, linux-tegra@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, nkristam@...dia.com
Subject: Re: [PATCH v6 00/15] Tegra XHCI controller ELPG support

On Tue, Jan 19, 2021 at 04:55:31PM +0800, JC Kuo wrote:
> Tegra XHCI controler can be placed in ELPG (Engine Level PowerGated)
> state for power saving when all of the connected USB devices are in
> suspended state. This patch series includes clk, phy and pmc changes
> that are required for properly place controller in ELPG and bring
> controller out of ELPG.
> 
> JC Kuo (15):
>   clk: tegra: Add PLLE HW power sequencer control
>   clk: tegra: Don't enable PLLE HW sequencer at init
>   phy: tegra: xusb: Move usb3 port init for Tegra210
>   phy: tegra: xusb: tegra210: Do not reset UPHY PLL
>   phy: tegra: xusb: Rearrange UPHY init on Tegra210
>   phy: tegra: xusb: Add Tegra210 lane_iddq operation
>   phy: tegra: xusb: Add sleepwalk and suspend/resume
>   soc/tegra: pmc: Provide USB sleepwalk register map
>   arm64: tegra210: XUSB PADCTL add "nvidia,pmc" prop
>   dt-bindings: phy: tegra-xusb: Add nvidia,pmc prop
>   phy: tegra: xusb: Add wake/sleepwalk for Tegra210
>   phy: tegra: xusb: Tegra210 host mode VBUS control
>   phy: tegra: xusb: Add wake/sleepwalk for Tegra186
>   usb: host: xhci-tegra: Unlink power domain devices
>   xhci: tegra: Enable ELPG for runtime/system PM

Greg, Kishon,

it might be best if one of you merged the whole set, except perhaps the
arm64 device tree change, because there's a lot of build-time
dependencies here that would be non-trivial to resolve otherwise. I
could prepare branches that model the dependencies correctly, but the
USB branch with the last two patches is ultimately going to depend on
all the rest anyway and pull that in, so the result is the same.

Thierry

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