linux-kernel - Re: [PATCH v3] xhci: tegra: USB2 pad power controls

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Date:   Wed, 12 Oct 2022 12:45:04 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Jim Lin <jilin@...dia.com>, gregkh@...uxfoundation.org,
        thierry.reding@...il.com, linux-tegra@...r.kernel.org
Cc:     mathias.nyman@...el.com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] xhci: tegra: USB2 pad power controls


On 12/10/2022 11:25, 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
> 
>   drivers/usb/host/xhci-tegra.c | 139 +++++++++++++++++++++++++++++++++-
>   1 file changed, 138 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/host/xhci-tegra.c b/drivers/usb/host/xhci-tegra.c
> index c8af2cd2216d..996182a1959f 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 +281,17 @@ 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);

Is it better to add this function pointer to the tegra_xusb structure?

Jon

-- 
nvpublic