| From | Krzysztof Kozlowski <> | Subject | [RFC v2 10/13] usb: hub: Power sequence the ports on activation | Date | Thu, 05 May 2016 14:34:23 +0200 |
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The autodetection of attached USB device might not work on certain boards where the power is delivered externally. These devices also might require a hard reset. Use pwrseq for that in USB hub.
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> --- drivers/usb/core/hub.c | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 1c82fcc448f5..0fddaacc62bf 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -26,6 +26,7 @@ #include <linux/mutex.h> #include <linux/random.h> #include <linux/pm_qos.h> +#include <linux/pwrseq.h> #include <asm/uaccess.h> #include <asm/byteorder.h> @@ -1661,7 +1662,17 @@ static int hub_configure(struct usb_hub *hub, usb_hub_adjust_deviceremovable(hdev, hub->descriptor); + /* FIXME: When do the pre-power-on? */ + /* + for (i = 0; i < maxchild; i++) + pwrseq_pre_power_on(hub->ports[i]->pwrseq); + */ + + for (i = 0; i < maxchild; i++) + pwrseq_post_power_on(hub->ports[i]->pwrseq); + hub_activate(hub, HUB_INIT); + return 0; fail: -- 1.9.1
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