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

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Message-ID: <YFszBH1JJmjJmjn2@orome.fritz.box>
Date:   Wed, 24 Mar 2021 13:39:32 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     Greg KH <gregkh@...uxfoundation.org>, mturquette@...libre.com,
        sboyd@...nel.org, 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 Fri, Feb 05, 2021 at 05:22:29PM +0100, Greg KH wrote:
> On Fri, Feb 05, 2021 at 05:15:21PM +0100, Thierry Reding wrote:
> > 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.
> 
> I have no objection for the usb patches to go through your tree as they
> are hardware-specific.

Kishon,

I haven't heard back from you on this yet. We missed v5.12 but I'd like
to get this into v5.13 since it's the last missing piece to get suspend
and resume working properly on a number of boards.

Are you okay if I take this through the Tegra tree to satisfy the
interdependencies between clk, PHY and USB patches? I've already got
Acked-by's from the clock and USB maintainers.

I want to tentatively take this into linux-next to give it a bit of soak
time before the ARM SoC -rc6 cut-off. Please let me know if you'd prefer
to apply these to your tree so I can back them out of the Tegra tree
again.

Thanks,
Thierry

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