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SubjectRe: [PATCH 1/2] usb/ehci-hub: Add workaround for EG20T/ML7213/ML7223/ML7831
Hello.

On 10-04-2012 8:07, Tomoya MORINAGA wrote:

> ISSUE: When a bit of EHCI status register (USBSTS) is set
> as 1, if the corresponded bit of EHCI interrupt enable
> register(USBINTR) is set as 1, an interrupt occurs.
> After that, even if the bit of USBINTR is set as 0, the
> interrupt continues occurring.
> Workaround: Clear the bit 3 of USBSTS before enabling the
> interrupt, at resume process.

> This patch is for
> Intel EG20T PCH
> LAPIS Semiconductor ML7213 IOH
> LAPIS Semiconductor ML7223 IOH
> LAPIS Semiconductor ML7831 IOH

> Signed-off-by: Tomoya MORINAGA<tomoya.rohm@gmail.com>
> ---
> drivers/usb/host/ehci-hub.c | 18 ++++++++++++++++++
> 1 files changed, 18 insertions(+), 0 deletions(-)

> diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
> index 256fbd4..7ddb62e 100644
> --- a/drivers/usb/host/ehci-hub.c
> +++ b/drivers/usb/host/ehci-hub.c
[...]
> @@ -451,6 +452,23 @@ static int ehci_bus_resume (struct usb_hcd *hcd)
>
> ehci->next_statechange = jiffies + msecs_to_jiffies(5);
>
> + if ((pdev->vendor == PCI_VENDOR_ID_INTEL&& pdev->device == 0x8807) ||
> + (pdev->vendor == PCI_VENDOR_ID_INTEL&& pdev->device == 0x880F) ||
> + (pdev->vendor == 0x10DB&& pdev->device == 0x801C) || /* ML7213 */
> + (pdev->vendor == 0x10DB&& pdev->device == 0x8007) || /* ML7223 */
> + (pdev->vendor == 0x10DB&& pdev->device == 0x8807)) { /* ML7831 */

Why not:

if ((pdev->vendor == PCI_VENDOR_ID_INTEL &&
(pdev->device == 0x8807 || pdev->device == 0x880F)) ||
(pdev->vendor == 0x10DB &&
(pdev->device == 0x801C || /* ML7213 */
pdev->device == 0x8007 || /* ML7223 */
pdev->device == 0x8807) /* ML7831 */
)) {

which avoids the duplicate checks? The same about the next patch.

WBR, Sergei


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