diff mbox series

[2/2] usb: xhci: fix timeout for transition from RExit to U0

Message ID 1540141725-13047-2-git-send-email-aaron.ma@canonical.com (mailing list archive)
State New, archived
Headers show
Series [1/2] usb: xhci: fix uninitialized completion when USB3 port got wrong status | expand

Commit Message

Aaron Ma Oct. 21, 2018, 5:08 p.m. UTC
This definition is used by msecs_to_jiffies in milliseconds.
According to the comments, max rexit timeout should be 20ms.
Align with the comments to properly calculate the delay.

Verified on Sunrise Point-LP and Cannon Lake.

Signed-off-by: Aaron Ma <aaron.ma@canonical.com>
---
 drivers/usb/host/xhci.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Greg Kroah-Hartman Oct. 21, 2018, 6:21 p.m. UTC | #1
On Mon, Oct 22, 2018 at 01:08:45AM +0800, Aaron Ma wrote:
> This definition is used by msecs_to_jiffies in milliseconds.
> According to the comments, max rexit timeout should be 20ms.
> Align with the comments to properly calculate the delay.
> 
> Verified on Sunrise Point-LP and Cannon Lake.
> 
> Signed-off-by: Aaron Ma <aaron.ma@canonical.com>
> ---
>  drivers/usb/host/xhci.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
> index 6230a578324c..30225c53be1c 100644
> --- a/drivers/usb/host/xhci.h
> +++ b/drivers/usb/host/xhci.h
> @@ -1678,7 +1678,7 @@ struct xhci_bus_state {
>   * It can take up to 20 ms to transition from RExit to U0 on the
>   * Intel Lynx Point LP xHCI host.
>   */
> -#define	XHCI_MAX_REXIT_TIMEOUT	(20 * 1000)
> +#define	XHCI_MAX_REXIT_TIMEOUT	20

Can we put the units in the #define itself so that this will be more
obvious in the future?  Like XHCI_MAX_REXIT_TIMEOUT_MS?

thanks,

greg k-h
Aaron Ma Oct. 22, 2018, 3:37 a.m. UTC | #2
On 10/22/18 2:21 AM, Greg KH wrote:
> Can we put the units in the #define itself so that this will be more
> obvious in the future?  Like XHCI_MAX_REXIT_TIMEOUT_MS?

If no other concerns about these 2 patches,
I will send V2 of 2nd patch to follow your advice.

Thanks,
Aaron
diff mbox series

Patch

diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 6230a578324c..30225c53be1c 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1678,7 +1678,7 @@  struct xhci_bus_state {
  * It can take up to 20 ms to transition from RExit to U0 on the
  * Intel Lynx Point LP xHCI host.
  */
-#define	XHCI_MAX_REXIT_TIMEOUT	(20 * 1000)
+#define	XHCI_MAX_REXIT_TIMEOUT	20
 
 static inline unsigned int hcd_index(struct usb_hcd *hcd)
 {