linux-kernel - Re: [PATCH v4] xhci: tegra: USB2 pad power controls

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Message-ID: <Y01jNqAZrx0uA2xe@kroah.com>
Date:   Mon, 17 Oct 2022 16:14:14 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Jim Lin <jilin@...dia.com>
Cc:     jonathanh@...dia.com, thierry.reding@...il.com,
        mathias.nyman@...el.com, linux-usb@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] xhci: tegra: USB2 pad power controls

On Mon, Oct 17, 2022 at 08:25:31PM +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: Jim Lin <jilin@...dia.com>
> ---
> 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.
> 
>  drivers/usb/host/xhci-tegra.c | 134 +++++++++++++++++++++++++++++++++-
>  1 file changed, 133 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/host/xhci-tegra.c b/drivers/usb/host/xhci-tegra.c
> index c8af2cd2216d..a47454503d9e 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;
> @@ -274,9 +281,12 @@ struct tegra_xusb {
>  
>  	bool suspended;
>  	struct tegra_xusb_context context;
> +	u32 enable_utmi_pad_after_lp0_exit;
>  };
>  
>  static struct hc_driver __read_mostly tegra_xhci_hc_driver;
> +static int (*original_xhci_hub_control)(struct usb_hcd *hcd, u16 typeReq, u16 wValue, u16 wIndex,
> +	    char *buf, u16 wLength);

That does not work when you have multiple devices in the system, right?
You should not have _any_ static data in a driver.

thanks,

greg k-h