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 <[email protected]> CC: Vivek Gautam <[email protected]> CC: Jingoo Han <[email protected]> CC: Alan Stern <[email protected]> CC: Kukjin Kim <[email protected]> CC: Felipe Balbi <[email protected]> CC: Greg Kroah-Hartman <[email protected]> --- 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); -- 1.7.12.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
