linux-kernel - Re: [PATCH v7 00/14] Tegra XHCI controller ELPG support

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Date:   Fri, 5 Feb 2021 17:15:21 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     gregkh@...uxfoundation.org, kishon@...com, mturquette@...libre.com,
        sboyd@...nel.org
Cc:     JC Kuo <jckuo@...dia.com>, robh@...nel.org, jonathanh@...dia.com,
        linux-tegra@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        nkristam@...dia.com, linux-clk@...r.kernel.org
Subject: Re: [PATCH v7 00/14] Tegra XHCI controller ELPG support

On Wed, Jan 20, 2021 at 03:34:00PM +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 (14):
>   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: 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
> 
>  .../phy/nvidia,tegra124-xusb-padctl.txt       |    1 +
>  arch/arm64/boot/dts/nvidia/tegra210.dtsi      |    1 +
>  drivers/clk/tegra/clk-pll.c                   |   12 -
>  drivers/clk/tegra/clk-tegra210.c              |   53 +-
>  drivers/phy/tegra/xusb-tegra186.c             |  558 ++++-
>  drivers/phy/tegra/xusb-tegra210.c             | 1889 +++++++++++++----
>  drivers/phy/tegra/xusb.c                      |   92 +-
>  drivers/phy/tegra/xusb.h                      |   22 +-
>  drivers/soc/tegra/pmc.c                       |   94 +
>  drivers/usb/host/xhci-tegra.c                 |  613 ++++--
>  include/linux/clk/tegra.h                     |    4 +-
>  include/linux/phy/tegra/xusb.h                |   10 +-
>  12 files changed, 2784 insertions(+), 565 deletions(-)
> 
> v5 "phy: tegra: xusb: tegra210: Do not reset UPHY PLL" is moved
> into v6 "phy: tegra: xusb: Rearrange UPHY init on Tegra210"

Mike, Stephen,

could you guys take a look at the two clk patches here and give an
Acked-by? There's build-time dependencies throughout the series, so it'd
be good if they can all go through either the PHY or USB trees.

Kishon, Greg,

any comments on these patches? Unfortunately, the USB patches in this
series have a build-time dependency on the PHY patches, so this should
all go through one tree. Since this all culminates in the XHCI driver,
merging this through the USB tree might be best, provided that Kishon
provides his Acked-by on the PHY patches.

Alternatively, I can create a set of branches with the correct
dependencies and send out pull requests for the three subsystems if
that's preferrable.

Let me know how you want to handle these.

Thanks,
Thierry

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