Re: [PATCH v2 4/4] usb: Add APIs to access host registers from Tegra PHY

Alan Stern
2013-01-17T15:15:21Z

On Thu, 17 Jan 2013, Venu Byravarasu wrote:

> As Tegra PHY driver need to access one of the Host registers,
> added few APIs to ehci tegra driver.
>
> Signed-off-by: Venu Byravarasu <vbyravarasu@nvidia.com>
> ---
> delta from v1:
> Taken care of RWC bits, while accessing PORTSC register.
>
> drivers/usb/host/ehci-tegra.c | 70 ++++++++++++++++++++++++++++++++++++-
> drivers/usb/phy/tegra_usb_phy.c | 51 +++++++--------------------
> include/linux/usb/tegra_usb_phy.h | 6 +++
> 3 files changed, 88 insertions(+), 39 deletions(-)
>
> diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c
> index 55a9cde..6bbf66a 100644
> --- a/drivers/usb/host/ehci-tegra.c
> +++ b/drivers/usb/host/ehci-tegra.c
> @@ -2,7 +2,7 @@
> * EHCI-compliant USB host controller driver for NVIDIA Tegra SoCs
> *
> * Copyright (C) 2010 Google, Inc.
> - * Copyright (C) 2009 NVIDIA Corporation
> + * Copyright (C) 2009 - 2013 NVIDIA Corporation
> *
> * This program is free software; you can redistribute it and/or modify it
> * under the terms of the GNU General Public License as published by the
> @@ -33,6 +33,16 @@
> #define TEGRA_USB2_BASE 0xC5004000
> #define TEGRA_USB3_BASE 0xC5008000
>
> +/* PORTSC registers */
> +#define USB_PORTSC1 0x184
> +#define USB_PORTSC1_PTS(x) (((x) & 0x3) << 30)
> +#define USB_PORTSC1_PHCD (1 << 23)
> +#define USB_PORTSC1_WKOC (1 << 22)
> +#define USB_PORTSC1_WKDS (1 << 21)
> +#define USB_PORTSC1_WKCN (1 << 20)
> +#define USB_PORTSC1_PEC (1 << 3)
> +#define USB_PORTSC1_CSC (1 << 1)

Why redefine these values when they are already defined in
include/linux/usb/ehci_defs.h?

> @@ -605,6 +615,53 @@ static const struct dev_pm_ops tegra_ehci_pm_ops = {
>
> #endif
>
> +/* Bits of PORTSC1, which will get cleared by writing 1 into them */
> +#define TEGRA_PORTSC_RWC_BITS (USB_PORTSC1_CSC | USB_PORTSC1_PEC)

Likewise for this. Not to mention that you forgot to include the
overcurrent-change bit.

Alan Stern