New patch to review for coreboot: 2f51d92 libpayload: Add timeouts in the EHCI USB driver
Nico Huber (nico.huber@secunet.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/1077
-gerrit
commit 2f51d9239824baaac28029b5cabb69f1cad06236 Author: Nico Huber nico.huber@secunet.com Date: Mon May 21 14:53:43 2012 +0200
libpayload: Add timeouts in the EHCI USB driver
We should always have some timeout when we wait for the hardware. This adds missing timeouts to the EHCI driver.
Change-Id: I13ba532a6daf47510b16b8fdbe572a21f1d8b09c Signed-off-by: Nico Huber nico.huber@secunet.com --- payloads/libpayload/drivers/usb/ehci.c | 90 ++++++++++++++++++++-------- payloads/libpayload/drivers/usb/ehci_rh.c | 32 +++++++++-- 2 files changed, 91 insertions(+), 31 deletions(-)
diff --git a/payloads/libpayload/drivers/usb/ehci.c b/payloads/libpayload/drivers/usb/ehci.c index 9500059..cd1e867 100644 --- a/payloads/libpayload/drivers/usb/ehci.c +++ b/payloads/libpayload/drivers/usb/ehci.c @@ -116,7 +116,21 @@ static int wait_for_tds(qtd_t *head) qtd_t *cur = head; while (1) { if (0) dump_td(virt_to_phys(cur)); - while ((cur->token & QTD_ACTIVE) && !(cur->token & QTD_HALTED)) udelay(60); + + /* wait for results */ + /* TOTEST: how long to wait? + * tested with some USB2.0 flash sticks: + * slowest took around 180ms + */ + int timeout = 10000; /* time out after 10000 * 50us == 500ms */ + while ((cur->token & QTD_ACTIVE) && !(cur->token & QTD_HALTED) + && timeout--) + udelay(50); + if (timeout < 0) { + printf("Error: ehci: queue transfer " + "processing timed out.\n"); + return 1; + } if (cur->token & QTD_HALTED) { printf("ERROR with packet\n"); dump_td(virt_to_phys(cur)); @@ -134,6 +148,51 @@ static int wait_for_tds(qtd_t *head) return result; }
+static int ehci_set_async_schedule(ehci_t *ehcic, int enable) +{ + /* Set async schedule status. */ + if (enable) + ehcic->operation->usbcmd |= HC_OP_ASYNC_SCHED_EN; + else + ehcic->operation->usbcmd &= ~HC_OP_ASYNC_SCHED_EN; + /* Wait for the controller to accept async schedule status. + * This shouldn't take too long, but we should timeout nevertheless. + */ + enable = enable ? HC_OP_ASYNC_SCHED_STAT : 0; + int timeout = 100; /* time out after 100ms */ + while (((ehcic->operation->usbsts & HC_OP_ASYNC_SCHED_STAT) != enable) + && timeout--) + mdelay(1); + if (timeout < 0) { + debug("ehci async schedule status change timed out.\n"); + return 1; + } + return 0; +} + +static int ehci_process_async_schedule( + ehci_t *ehcic, ehci_qh_t *qhead, qtd_t *head) +{ + int result; + + /* make sure async schedule is disabled */ + if (ehci_set_async_schedule(ehcic, 0)) return 1; + + /* hook up QH */ + ehcic->operation->asynclistaddr = virt_to_phys(qhead); + + /* start async schedule */ + if (ehci_set_async_schedule(ehcic, 1)) return 1; + + /* wait for result */ + result = wait_for_tds(head); + + /* disable async schedule */ + ehci_set_async_schedule(ehcic, 0); + + return result; +} + static int ehci_bulk (endpoint_t *ep, int size, u8 *data, int finalize) { int result = 0; @@ -179,19 +238,8 @@ static int ehci_bulk (endpoint_t *ep, int size, u8 *data, int finalize) qh->td.token |= (ep->toggle?QTD_TOGGLE_DATA1:0); head->token |= (ep->toggle?QTD_TOGGLE_DATA1:0);
- /* hook up QH */ - EHCI_INST(ep->dev->controller)->operation->asynclistaddr = virt_to_phys(qh); - - /* start async schedule */ - EHCI_INST(ep->dev->controller)->operation->usbcmd |= HC_OP_ASYNC_SCHED_EN; - while (!(EHCI_INST(ep->dev->controller)->operation->usbsts & HC_OP_ASYNC_SCHED_STAT)) ; /* wait */ - - /* wait for result */ - result = wait_for_tds(head); - - /* disable async schedule */ - EHCI_INST(ep->dev->controller)->operation->usbcmd &= ~HC_OP_ASYNC_SCHED_EN; - while (EHCI_INST(ep->dev->controller)->operation->usbsts & HC_OP_ASYNC_SCHED_STAT) ; /* wait */ + result = ehci_process_async_schedule( + EHCI_INST(ep->dev->controller), qh, head);
ep->toggle = (cur->token & QTD_TOGGLE_MASK) >> QTD_TOGGLE_SHIFT;
@@ -268,18 +316,8 @@ static int ehci_control (usbdev_t *dev, direction_t dir, int drlen, void *devreq qh->epcaps = 3 << QH_PIPE_MULTIPLIER_SHIFT; qh->td.next_qtd = virt_to_phys(head);
- /* hook up QH */ - EHCI_INST(dev->controller)->operation->asynclistaddr = virt_to_phys(qh); - - /* start async schedule */ - EHCI_INST(dev->controller)->operation->usbcmd |= HC_OP_ASYNC_SCHED_EN; - while (!(EHCI_INST(dev->controller)->operation->usbsts & HC_OP_ASYNC_SCHED_STAT)) ; /* wait */ - - result = wait_for_tds(head); - - /* disable async schedule */ - EHCI_INST(dev->controller)->operation->usbcmd &= ~HC_OP_ASYNC_SCHED_EN; - while (EHCI_INST(dev->controller)->operation->usbsts & HC_OP_ASYNC_SCHED_STAT) ; /* wait */ + result = ehci_process_async_schedule( + EHCI_INST(dev->controller), qh, head);
free_qh_and_tds(qh, head); return result; diff --git a/payloads/libpayload/drivers/usb/ehci_rh.c b/payloads/libpayload/drivers/usb/ehci_rh.c index dd073a3..aeead3b 100644 --- a/payloads/libpayload/drivers/usb/ehci_rh.c +++ b/payloads/libpayload/drivers/usb/ehci_rh.c @@ -55,9 +55,21 @@ ehci_rh_hand_over_port (usbdev_t *dev, int port) { debug("giving up port %x, it's USB1\n", port+1);
+ /* Clear ConnectStatusChange before evaluation */ + /* RW/C register, so clear it by writing 1 */ + RH_INST(dev)->ports[port] |= P_CONN_STATUS_CHANGE; + /* Lowspeed device. Hand over to companion */ RH_INST(dev)->ports[port] |= P_PORT_OWNER; - do {} while (!(RH_INST(dev)->ports[port] & P_CONN_STATUS_CHANGE)); + + /* TOTEST: how long to wait? trying 100ms for now */ + int timeout = 10; /* timeout after 10 * 10ms == 100ms */ + while (!(RH_INST(dev)->ports[port] & P_CONN_STATUS_CHANGE) && timeout--) + mdelay(10); + if (!(RH_INST(dev)->ports[port] & P_CONN_STATUS_CHANGE)) { + debug("Warning: Handing port over to companion timed out.\n"); + } + /* RW/C register, so clear it by writing 1 */ RH_INST(dev)->ports[port] |= P_CONN_STATUS_CHANGE; return; @@ -73,7 +85,7 @@ ehci_rh_scanport (usbdev_t *dev, int port) } /* device connected, handle */ if (RH_INST(dev)->ports[port] & P_CURR_CONN_STATUS) { - mdelay(100); + mdelay(100); // usb20 spec 9.1.2 if ((RH_INST(dev)->ports[port] & P_LINE_STATUS) == P_LINE_STATUS_LOWSPEED) { ehci_rh_hand_over_port(dev, port); return; @@ -85,13 +97,23 @@ ehci_rh_scanport (usbdev_t *dev, int port) RH_INST(dev)->ports[port] = (RH_INST(dev)->ports[port] & ~P_PORT_ENABLE) | P_PORT_RESET;
/* Wait a bit while reset is active. */ - mdelay(50); + mdelay(50); // usb20 spec 7.1.7.5 (TDRSTR)
/* Deassert reset. */ RH_INST(dev)->ports[port] &= ~P_PORT_RESET;
- /* Wait for flag change to finish. The controller might take a while */ - while (RH_INST(dev)->ports[port] & P_PORT_RESET) ; + /* Wait max. 2ms (ehci spec 2.3.9) for flag change to finish. */ + int timeout = 20; /* time out after 20 * 100us == 2ms */ + while ((RH_INST(dev)->ports[port] & P_PORT_RESET) && timeout--) + udelay(100); + if (RH_INST(dev)->ports[port] & P_PORT_RESET) { + printf("Error: ehci_rh: port reset timed out.\n"); + return; + } + + /* If the host controller enabled the port, it's a high-speed + * device, otherwise it's full-speed. + */ if (!(RH_INST(dev)->ports[port] & P_PORT_ENABLE)) { ehci_rh_hand_over_port(dev, port); return;
-
Nico Huber