On Wed, 13 Mar 2013, Alexander Graf wrote:
> On my Exynos 5 based Arndale system, I need to pull the reset line down
> and then let it go up again to actually perform a reset. Without that
> reset, I can't find any USB hubs on my bus, rendering the USB controller
> useless.
>
> So this patch implements the above logic, making EHCI and OHCI work on
> Arndale systems for me.
>
> Signed-off-by: Alexander Graf <agraf@xxxxxxx>
> CC: Vivek Gautam <gautam.vivek@xxxxxxxxxxx>
> CC: Jingoo Han <jg1.han@xxxxxxxxxxx>
> CC: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
> CC: Kukjin Kim <kgene.kim@xxxxxxxxxxx>
> CC: Felipe Balbi <balbi@xxxxxx>
> CC: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
>
> ---
>
> As this affects 3.9, this patch should definitely be considered for inclusion
> there.
> ---
> drivers/usb/host/ehci-s5p.c | 10 ++++++++--
> 1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/host/ehci-s5p.c b/drivers/usb/host/ehci-s5p.c
> index 20ebf6a..c6d67e4 100644
> --- a/drivers/usb/host/ehci-s5p.c
> +++ b/drivers/usb/host/ehci-s5p.c
> @@ -103,9 +103,15 @@ static void s5p_setup_vbus_gpio(struct platform_device *pdev)
> if (!gpio_is_valid(gpio))
> return;
>
> - err = gpio_request_one(gpio, GPIOF_OUT_INIT_HIGH, "ehci_vbus_gpio");
> - if (err)
> + /* reset pulls the line down, then up again */
> + err = gpio_request_one(gpio, GPIOF_OUT_INIT_LOW, "ehci_vbus_gpio");
> + if (err) {
> dev_err(&pdev->dev, "can't request ehci vbus gpio %d", gpio);
> + return;
> + }
> + mdelay(1);
> + __gpio_set_value(gpio, 1);
> + gpio_free(gpio);
> }
>
> static u64 ehci_s5p_dma_mask = DMA_BIT_MASK(32);
Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
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