[RFC v2 10/13] usb: hub: Power sequence the ports on activation
From: Krzysztof Kozlowski <hidden>
Date: 2016-05-05 12:35:49
Also in:
linux-devicetree, linux-mmc, linux-pm, linux-samsung-soc, lkml
Subsystem:
the rest, usb subsystem · Maintainers:
Linus Torvalds, Greg Kroah-Hartman
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 <redacted> --- 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