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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 17 Oct 2022 09:36:39 +0000
From:   Jim Lin <jilin@...dia.com>
To:     Jonathan Hunter <jonathanh@...dia.com>
CC:     "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>,
        "mathias.nyman@...el.com" <mathias.nyman@...el.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: Re: [PATCH v3] xhci: tegra: USB2 pad power controls

On Wed, 2022-10-12 at 12:45 +0100, Jon Hunter wrote:
> 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
> 
Do you mean removing variable "original_xhci_hub_control" and save
function pointer to the tegra_xusb structure ?

But that doesn't look possible over here to point to tegra_xusb
structure and save pointer (to tegra_xhci_hc_driver.hub_control) into
it.

"
static int __init tegra_xusb_init(void)
{
	xhci_init_driver(&tegra_xhci_hc_driver, &tegra_xhci_overrides);

	return platform_driver_register(&tegra_xusb_driver);
}
module_init(tegra_xusb_init);
"

--nvpublic