[PATCH] usb: remove redundant tdi_reset

[PATCH] usb: remove redundant tdi_reset

[Shengzhou Liu]

We remove the redundant tdi_reset in ehci_setup since there
is already it in ehci_reset.
It was observed that the duplicated tdi_reset was causing
the PHY_CLK_VALID bit unstable.

Signed-off-by: Shengzhou Liu <Shengzhou.Liu@freescale.com>
---
 drivers/usb/host/ehci-hcd.c |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 416a6dc..83b5a17 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -670,9 +670,6 @@ int ehci_setup(struct usb_hcd *hcd)
 	if (retval)
 		return retval;
 
-	if (ehci_is_TDI(ehci))
-		tdi_reset(ehci);
-
 	ehci_reset(ehci);
 
 	return 0;
-- 
1.7.0.4

Re: [PATCH] usb: remove redundant tdi_reset

[Alan Stern]

On Wed, 17 Apr 2013, Shengzhou Liu wrote:

> We remove the redundant tdi_reset in ehci_setup since there
> is already it in ehci_reset.
> It was observed that the duplicated tdi_reset was causing
> the PHY_CLK_VALID bit unstable.
> 
> Signed-off-by: Shengzhou Liu <Shengzhou.Liu@freescale.com>
> ---
>  drivers/usb/host/ehci-hcd.c |    3 ---
>  1 files changed, 0 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
> index 416a6dc..83b5a17 100644
> --- a/drivers/usb/host/ehci-hcd.c
> +++ b/drivers/usb/host/ehci-hcd.c
> @@ -670,9 +670,6 @@ int ehci_setup(struct usb_hcd *hcd)
>  	if (retval)
>  		return retval;
>  
> -	if (ehci_is_TDI(ehci))
> -		tdi_reset(ehci);
> -
>  	ehci_reset(ehci);
>  
>  	return 0;

Acked-by: Alan Stern <stern@rowland.harvard.edu>

This should be applied to stable kernels going back to 3.6.

In case you are wondering why that redudant call was added, I did it
because some of the PCI drivers (Intel and TDI) already had calls to
tdi_reset.  The commit removed those calls, so the new one was added 
in.