From b6d7852cf8b7ced786937d3d080956b0c7be9836 Mon Sep 17 00:00:00 2001 From: Vipin Kumar Date: Thu, 13 Dec 2012 16:25:53 +0530 Subject: [PATCH] usbh/ehci: Increase timeout for enumeration The current logic reads the port status just once after usb_hub_power_on and expects the portstatus and portchange to report the connection status immediately and correctly. Few pen drives are not able to report both of them immediately ie. those pens report the connection change but not the connected state after the first read. This opportunity once lost is gone for ever because the u-boot, unlike linux or any other OS, works in polling mode. This patch modifies the logic to read the port status continuously until the portstatus and portchange both report a connection change as well as a connected state or no connection change and no connection. This logic is placed in a timeout of 10 sec. At the end of it, the pen drive would have either reported a ONE or a ZERO in bit 1 of portstatus as well as portchange. It enhances the set of pen drives which can eventually be detected by u-boot Note: This 10 second timeout is based purely on several experiments done with the broken pen drives Signed-off-by: Vipin Kumar Acked-by: Igor Grinberg --- common/usb_hub.c | 33 ++++++++++++++++++++++++++++----- 1 file changed, 28 insertions(+), 5 deletions(-) diff --git a/common/usb_hub.c b/common/usb_hub.c index e4a120120d..4d75b902ff 100644 --- a/common/usb_hub.c +++ b/common/usb_hub.c @@ -396,14 +396,37 @@ static int usb_hub_configure(struct usb_device *dev) for (i = 0; i < dev->maxchild; i++) { ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1); unsigned short portstatus, portchange; + int ret; + ulong start = get_timer(0); + + /* + * Wait for (whichever finishes first) + * - A maximum of 10 seconds + * This is a purely observational value driven by connecting + * a few broken pen drives and taking the max * 1.5 approach + * - connection_change and connection state to report same + * state + */ + do { + ret = usb_get_port_status(dev, i + 1, portsts); + if (ret < 0) { + USB_HUB_PRINTF("get_port_status failed\n"); + break; + } + + portstatus = le16_to_cpu(portsts->wPortStatus); + portchange = le16_to_cpu(portsts->wPortChange); + + if ((portchange & USB_PORT_STAT_C_CONNECTION) == + (portstatus & USB_PORT_STAT_CONNECTION)) + break; + + mdelay(100); + } while (get_timer(start) < CONFIG_SYS_HZ * 10); - if (usb_get_port_status(dev, i + 1, portsts) < 0) { - USB_HUB_PRINTF("get_port_status failed\n"); + if (ret < 0) continue; - } - portstatus = le16_to_cpu(portsts->wPortStatus); - portchange = le16_to_cpu(portsts->wPortChange); USB_HUB_PRINTF("Port %d Status %X Change %X\n", i + 1, portstatus, portchange); -- 2.25.1