linux-kernel - Re: [PATCH v5 3/3] xhci: tegra: USB2 pad power controls

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Message-ID: <Y1qO8cN4+kJVk2f5@kroah.com>
Date:   Thu, 27 Oct 2022 16:00:17 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Jim Lin <jilin@...dia.com>
Cc:     mathias.nyman@...el.com, thierry.reding@...il.com,
        jonathanh@...dia.com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        Petlozu Pravareshwar <petlozup@...dia.com>,
        JC Kuo <jckuo@...dia.com>
Subject: Re: [PATCH v5 3/3] xhci: tegra: USB2 pad power controls

On Thu, Oct 27, 2022 at 09:31:27PM +0800, Jim Lin wrote:
> Program USB2 pad PD controls during port connect/disconnect, port
> suspend/resume, and test mode, to reduce power consumption on
> disconnect or suspend.
> 
> Signed-off-by: Petlozu Pravareshwar <petlozup@...dia.com>
> Signed-off-by: JC Kuo <jckuo@...dia.com>
> Signed-off-by: Jim Lin <jilin@...dia.com>

Who is the author here?  These do not seem to be in the correct order if
you are the author, right?

> 
> ---
> v2: Fix issue that wrong tegra->phys[] may be accessed on tegra124
> v3: No change on copyright
> v4: Remove hcd_to_tegra_xusb() function which is used only once.
> v5: Update .hub_control in tegra_xhci_overrides (xhci-tegra.c)
>     Invoke xhci_hub_control() directly (xhci-tegra.c)
> 
>  drivers/usb/host/xhci-tegra.c | 131 +++++++++++++++++++++++++++++++++-
>  1 file changed, 130 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/host/xhci-tegra.c b/drivers/usb/host/xhci-tegra.c
> index c8af2cd2216d..f685bb7459ba 100644
> --- a/drivers/usb/host/xhci-tegra.c
> +++ b/drivers/usb/host/xhci-tegra.c
> @@ -189,6 +189,13 @@ struct tegra_xusb_context_soc {
>  	} fpci;
>  };
>  
> +enum tegra_xhci_phy_type {
> +	USB3_PHY,
> +	USB2_PHY,
> +	HSIC_PHY,
> +	MAX_PHY_TYPES,
> +};
> +
>  struct tegra_xusb_soc {
>  	const char *firmware;
>  	const char * const *supply_names;
> @@ -274,6 +281,7 @@ struct tegra_xusb {
>  
>  	bool suspended;
>  	struct tegra_xusb_context context;
> +	u32 enable_utmi_pad_after_lp0_exit;

This is a bitfield, how do we know it will fit in a u32?  What is the
range you are putting in here?

thanks,

greg k-h