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

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Date:   Tue, 20 Sep 2022 12:03:19 +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 14-09-22, 10:59, JC Kuo wrote:
> On 9/13/22 22:34, Vinod Koul wrote:
> > On 06-09-22, 10:43, JC Kuo wrote:

> > 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?
> > That would work, too. However, because Tegra USB has separate phys for USB3 SS
> and USB2, I'd like to keep the USB2 phy operations as they are now, so that USB
> host and device controller drivers do not have to distinguish the phy type and
> invoke different phy stubs. Furthermore, PD_ZI=0 does really power on the USB2
> phy, partially.
> 
> For example:
> 1. in .probe(),
>     for_each_usb_phy {
>          phy_init(phy);
>     }
> 
>     for_each_usb3_phy {
>          phy_power_on(phy);
>     };
> 
> 2. upon detecting connection,
> 
>     phy_power_on(the_target_usb2_phy);

It should be always phy_init() in probe and once detection
phy_power_on()

that should be generic flow for all...

-- 
~Vinod