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From: Thierry Reding <thierry.reding@gmail.com>
To: JC Kuo <jckuo@nvidia.com>
Cc: gregkh@linuxfoundation.org, robh@kernel.org,
	jonathanh@nvidia.com, kishon@ti.com, linux-tegra@vger.kernel.org,
	linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
	devicetree@vger.kernel.org, nkristam@nvidia.com
Subject: Re: [PATCH v6 15/15] xhci: tegra: Enable ELPG for runtime/system PM
Date: Tue, 19 Jan 2021 15:04:15 +0100	[thread overview]
Message-ID: <YAbm39gww7F3okLP@ulmo> (raw)
In-Reply-To: <20210119085546.725005-16-jckuo@nvidia.com>

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On Tue, Jan 19, 2021 at 04:55:46PM +0800, JC Kuo wrote:
> This commit implements the complete programming sequence for ELPG
> entry and exit.
> 
>  1. At ELPG entry, invokes tegra_xusb_padctl_enable_phy_sleepwalk()
>     and tegra_xusb_padctl_enable_phy_wake() to configure XUSB PADCTL
>     sleepwalk and wake detection circuits to maintain USB lines level
>     and respond to wake events (wake-on-connect, wake-on-disconnect,
>     device-initiated-wake).
> 
>  2. At ELPG exit, invokes tegra_xusb_padctl_disable_phy_sleepwalk()
>     and tegra_xusb_padctl_disable_phy_wake() to disarm sleepwalk and
>     wake detection circuits.
> 
> At runtime suspend, XUSB host controller can enter ELPG to reduce
> power consumption. When XUSB PADCTL wake detection circuit detects
> a wake event, an interrupt will be raised. xhci-tegra driver then
> will invoke pm_runtime_resume() for xhci-tegra.
> 
> Runtime resume could also be triggered by protocol drivers, this is
> the host-initiated-wake event. At runtime resume, xhci-tegra driver
> brings XUSB host controller out of ELPG to handle the wake events.
> 
> The same ELPG enter/exit procedure will be performed for system
> suspend/resume path so USB devices can remain connected across SC7.
> 
> Signed-off-by: JC Kuo <jckuo@nvidia.com>
> ---
> v6:
>    fix compiling warning: extra tokens at end of #ifdef directive
> v5:
>    avoid using xhci_get_rhub()
>    protect ELPG routines with (CONFIG_PM || CONFIG_PM_SLEEP)
> v4:
>    reshuffle the code to avoid these pre-declarations
> v3:
>    use 'unsigned int' for PHY index
>    remove unnecessary 'else'
>    drop IRQF_TRIGGER_HIGH when invokes devm_request_threaded_irq()
> 
>  drivers/usb/host/xhci-tegra.c | 407 ++++++++++++++++++++++++++++++----
>  1 file changed, 370 insertions(+), 37 deletions(-)

Acked-by: Thierry Reding <treding@nvidia.com>

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  reply	other threads:[~2021-01-19 23:37 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-19  8:55 [PATCH v6 00/15] Tegra XHCI controller ELPG support JC Kuo
2021-01-19  8:55 ` [PATCH v6 01/15] clk: tegra: Add PLLE HW power sequencer control JC Kuo
2021-01-19 14:11   ` Thierry Reding
2021-02-11  3:06   ` Stephen Boyd
2021-01-19  8:55 ` [PATCH v6 02/15] clk: tegra: Don't enable PLLE HW sequencer at init JC Kuo
2021-01-19 14:12   ` Thierry Reding
2021-02-11  3:06   ` Stephen Boyd
2021-01-19  8:55 ` [PATCH v6 03/15] phy: tegra: xusb: Move usb3 port init for Tegra210 JC Kuo
2021-01-19  8:55 ` [PATCH v6 04/15] phy: tegra: xusb: tegra210: Do not reset UPHY PLL JC Kuo
2021-01-19 13:52   ` Thierry Reding
2021-01-20  1:42     ` JC Kuo
2021-01-19  8:55 ` [PATCH v6 05/15] phy: tegra: xusb: Rearrange UPHY init on Tegra210 JC Kuo
2021-01-19  8:55 ` [PATCH v6 06/15] phy: tegra: xusb: Add Tegra210 lane_iddq operation JC Kuo
2021-01-19  8:55 ` [PATCH v6 07/15] phy: tegra: xusb: Add sleepwalk and suspend/resume JC Kuo
2021-01-19 13:54   ` Thierry Reding
2021-01-19  8:55 ` [PATCH v6 08/15] soc/tegra: pmc: Provide USB sleepwalk register map JC Kuo
2021-01-19  8:55 ` [PATCH v6 09/15] arm64: tegra210: XUSB PADCTL add "nvidia,pmc" prop JC Kuo
2021-01-19  8:55 ` [PATCH v6 10/15] dt-bindings: phy: tegra-xusb: Add nvidia,pmc prop JC Kuo
2021-01-19  8:55 ` [PATCH v6 11/15] phy: tegra: xusb: Add wake/sleepwalk for Tegra210 JC Kuo
2021-01-19 13:58   ` Thierry Reding
2021-01-19  8:55 ` [PATCH v6 12/15] phy: tegra: xusb: Tegra210 host mode VBUS control JC Kuo
2021-01-19  8:55 ` [PATCH v6 13/15] phy: tegra: xusb: Add wake/sleepwalk for Tegra186 JC Kuo
2021-01-19 13:59   ` Thierry Reding
2021-01-19  8:55 ` [PATCH v6 14/15] usb: host: xhci-tegra: Unlink power domain devices JC Kuo
2021-01-19 14:04   ` Thierry Reding
2021-01-19  8:55 ` [PATCH v6 15/15] xhci: tegra: Enable ELPG for runtime/system PM JC Kuo
2021-01-19 14:04   ` Thierry Reding [this message]
2021-01-19 14:07 ` [PATCH v6 00/15] Tegra XHCI controller ELPG support Thierry Reding

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