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-rw-r--r--payloads/libpayload/drivers/usb/ehci.c24
-rw-r--r--payloads/libpayload/drivers/usb/ehci_private.h1
2 files changed, 22 insertions, 3 deletions
diff --git a/payloads/libpayload/drivers/usb/ehci.c b/payloads/libpayload/drivers/usb/ehci.c
index aaadf2dd4e..8d84f8dd60 100644
--- a/payloads/libpayload/drivers/usb/ehci.c
+++ b/payloads/libpayload/drivers/usb/ehci.c
@@ -83,6 +83,9 @@ static void ehci_shutdown (hci_t *controller)
/* Free periodic frame list */
free(phys_to_virt(EHCI_INST(controller)->operation->periodiclistbase));
+ /* Free dummy QH */
+ free(EHCI_INST(controller)->dummy_qh);
+
EHCI_INST(controller)->operation->configflag = 0;
}
@@ -521,9 +524,11 @@ static void *ehci_create_intr_queue(
int nothing_placed = 1;
u32 *const ps = (u32 *)phys_to_virt(EHCI_INST(ep->dev->controller)
->operation->periodiclistbase);
+ const u32 dummy_ptr = virt_to_phys(EHCI_INST(
+ ep->dev->controller)->dummy_qh) | PS_TYPE_QH;
for (i = 0; i < 1024; i += reqtiming) {
/* advance to the next free position */
- while ((i < 1024) && !(ps[i] & PS_TERMINATE)) ++i;
+ while ((i < 1024) && (ps[i] != dummy_ptr)) ++i;
if (i < 1024) {
ps[i] = virt_to_phys(&intrq->qh) | PS_TYPE_QH;
nothing_placed = 0;
@@ -547,9 +552,11 @@ static void ehci_destroy_intr_queue(endpoint_t *const ep, void *const queue)
int i;
u32 *const ps = (u32 *)phys_to_virt(EHCI_INST(
ep->dev->controller)->operation->periodiclistbase);
+ const u32 dummy_ptr = virt_to_phys(EHCI_INST(
+ ep->dev->controller)->dummy_qh) | PS_TYPE_QH;
for (i = 0; i < 1024; ++i) {
if ((ps[i] & PS_PTR_MASK) == virt_to_phys(&intrq->qh))
- ps[i] = PS_TERMINATE;
+ ps[i] = dummy_ptr;
}
/* wait 1ms for frame to end */
@@ -661,8 +668,19 @@ ehci_init (pcidev_t addr)
u32 *const periodic_list = (u32 *)memalign(4096, 1024 * sizeof(u32));
if (!periodic_list)
fatal("Not enough memory creating EHCI periodic frame list.\n");
+
+ /*
+ * Insert dummy QH in periodic frame list
+ * This helps with broken host controllers
+ * and doesn't violate the standard.
+ */
+ EHCI_INST(controller)->dummy_qh = (ehci_qh_t *)memalign(32, sizeof(ehci_qh_t));
+ memset(EHCI_INST(controller)->dummy_qh, 0,
+ sizeof(*EHCI_INST(controller)->dummy_qh));
+ EHCI_INST(controller)->dummy_qh->horiz_link_ptr = QH_TERMINATE;
for (i = 0; i < 1024; ++i)
- periodic_list[i] = PS_TERMINATE;
+ periodic_list[i] = virt_to_phys(EHCI_INST(controller)->dummy_qh)
+ | PS_TYPE_QH;
/* Make sure periodic schedule is disabled */
ehci_set_periodic_schedule(EHCI_INST(controller), 0);
diff --git a/payloads/libpayload/drivers/usb/ehci_private.h b/payloads/libpayload/drivers/usb/ehci_private.h
index a97336b492..3276e23edc 100644
--- a/payloads/libpayload/drivers/usb/ehci_private.h
+++ b/payloads/libpayload/drivers/usb/ehci_private.h
@@ -132,6 +132,7 @@ typedef volatile struct {
typedef struct ehci {
hc_cap_t *capabilities;
hc_op_t *operation;
+ ehci_qh_t *dummy_qh;
} ehci_t;
#define PS_TERMINATE 1