linux-kernel - Re: [PATCH v2 1/2] phy: tegra: xusb: add utmi pad power on/down ops

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Date:   Tue, 13 Sep 2022 20:04:45 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     JC Kuo <jckuo@...dia.com>
Cc:     Jim Lin <jilin@...dia.com>, thierry.reding@...il.com,
        jonathanh@...dia.com, balbi@...nel.org, gregkh@...uxfoundation.org,
        bhsieh@...dia.com, linux-phy@...ts.infradead.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH v2 1/2] phy: tegra: xusb: add utmi pad power on/down ops

On 06-09-22, 10:43, JC Kuo wrote:
> Hi Vinod,

Please _do_ _not_ _top_ _post_

> Before the device or host is being attached, we can keep most of the
> transceivers powered down (PD=1/PD_DR=1) to minimize power consumption. At this
> stage, in .phy_power_on(), we enable only the single-ended receiver (PD_ZI=0)
> for detecting connection. Upon detecting device's or host's connection, host or
> controller driver will invoke tegra_phy_xusb_utmi_pad_power_on() to power on all
> of the transceivers (PD=0/PD_DR=0) to equip full link functionality.

Thanks for this explanation... It helps!

Just a suggestion, can this be moved into phy_init() you have detected
connection in phy_power_on(), the transceiver can be enabled in
phy_int... Would that work?

-- 
~Vinod