You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
135 lines
3.7 KiB
135 lines
3.7 KiB
From dd0e5f9a6a4aed849bdb80641c2a2350476cede7 Mon Sep 17 00:00:00 2001
|
|
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
|
|
Date: Sun, 21 Jun 2015 11:10:49 +0200
|
|
Subject: [PATCH v3 2/6] usb: xhci: add Broadcom specific fake doorbell
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=UTF-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
This fixes problem with controller seeing devices only in some small
|
|
percentage of cold boots.
|
|
This quirk is also added to the platform data so we can activate it
|
|
when we register our platform driver.
|
|
|
|
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
|
|
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
|
|
---
|
|
drivers/usb/host/xhci-plat.c | 3 +++
|
|
drivers/usb/host/xhci.c | 57 +++++++++++++++++++++++++++++++++++++---
|
|
drivers/usb/host/xhci.h | 1 +
|
|
include/linux/usb/xhci_pdriver.h | 1 +
|
|
4 files changed, 59 insertions(+), 3 deletions(-)
|
|
|
|
--- a/drivers/usb/host/xhci-plat.c
|
|
+++ b/drivers/usb/host/xhci-plat.c
|
|
@@ -51,6 +51,9 @@ static void xhci_plat_quirks(struct devi
|
|
if ((node && of_property_read_bool(node, "usb3-lpm-capable")) ||
|
|
(pdata && pdata->usb3_lpm_capable))
|
|
xhci->quirks |= XHCI_LPM_SUPPORT;
|
|
+
|
|
+ if (pdata && pdata->usb3_fake_doorbell)
|
|
+ xhci->quirks |= XHCI_FAKE_DOORBELL;
|
|
}
|
|
|
|
/* called during probe() after chip reset completes */
|
|
--- a/drivers/usb/host/xhci.c
|
|
+++ b/drivers/usb/host/xhci.c
|
|
@@ -121,6 +121,39 @@ int xhci_halt(struct xhci_hcd *xhci)
|
|
return ret;
|
|
}
|
|
|
|
+static int xhci_fake_doorbell(struct xhci_hcd *xhci, int slot_id)
|
|
+{
|
|
+ u32 temp;
|
|
+
|
|
+ /* alloc a virt device for slot */
|
|
+ if (!xhci_alloc_virt_device(xhci, slot_id, NULL, GFP_NOIO)) {
|
|
+ xhci_warn(xhci, "Could not allocate xHCI USB device data structures\n");
|
|
+ return -ENOMEM;
|
|
+ }
|
|
+
|
|
+ /* ring fake doorbell for slot_id ep 0 */
|
|
+ xhci_ring_ep_doorbell(xhci, slot_id, 0, 0);
|
|
+ usleep_range(1000, 1500);
|
|
+
|
|
+ /* read the status register to check if HSE is set or not? */
|
|
+ temp = readl(&xhci->op_regs->status);
|
|
+
|
|
+ /* clear HSE if set */
|
|
+ if (temp & STS_FATAL) {
|
|
+ xhci_dbg(xhci, "HSE problem detected, status: 0x%x\n", temp);
|
|
+ temp &= ~(0x1fff);
|
|
+ temp |= STS_FATAL;
|
|
+ writel(temp, &xhci->op_regs->status);
|
|
+ usleep_range(1000, 1500);
|
|
+ readl(&xhci->op_regs->status);
|
|
+ }
|
|
+
|
|
+ /* Free virt device */
|
|
+ xhci_free_virt_device(xhci, slot_id);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
/*
|
|
* Set the run bit and wait for the host to be running.
|
|
*/
|
|
@@ -567,10 +600,25 @@ int xhci_init(struct usb_hcd *hcd)
|
|
|
|
static int xhci_run_finished(struct xhci_hcd *xhci)
|
|
{
|
|
- if (xhci_start(xhci)) {
|
|
- xhci_halt(xhci);
|
|
- return -ENODEV;
|
|
+ int err;
|
|
+
|
|
+ err = xhci_start(xhci);
|
|
+ if (err) {
|
|
+ err = -ENODEV;
|
|
+ goto out_err;
|
|
+ }
|
|
+ if (xhci->quirks & XHCI_FAKE_DOORBELL) {
|
|
+ err = xhci_fake_doorbell(xhci, 1);
|
|
+ if (err)
|
|
+ goto out_err;
|
|
+
|
|
+ err = xhci_start(xhci);
|
|
+ if (err) {
|
|
+ err = -ENODEV;
|
|
+ goto out_err;
|
|
+ }
|
|
}
|
|
+
|
|
xhci->shared_hcd->state = HC_STATE_RUNNING;
|
|
xhci->cmd_ring_state = CMD_RING_STATE_RUNNING;
|
|
|
|
@@ -580,6 +628,9 @@ static int xhci_run_finished(struct xhci
|
|
xhci_dbg_trace(xhci, trace_xhci_dbg_init,
|
|
"Finished xhci_run for USB3 roothub");
|
|
return 0;
|
|
+out_err:
|
|
+ xhci_halt(xhci);
|
|
+ return err;
|
|
}
|
|
|
|
/*
|
|
--- a/drivers/usb/host/xhci.h
|
|
+++ b/drivers/usb/host/xhci.h
|
|
@@ -1575,6 +1575,7 @@ struct xhci_hcd {
|
|
/* For controllers with a broken beyond repair streams implementation */
|
|
#define XHCI_BROKEN_STREAMS (1 << 19)
|
|
#define XHCI_PME_STUCK_QUIRK (1 << 20)
|
|
+#define XHCI_FAKE_DOORBELL (1 << 21)
|
|
unsigned int num_active_eps;
|
|
unsigned int limit_active_eps;
|
|
/* There are two roothubs to keep track of bus suspend info for */
|
|
--- a/include/linux/usb/xhci_pdriver.h
|
|
+++ b/include/linux/usb/xhci_pdriver.h
|
|
@@ -22,6 +22,7 @@
|
|
*/
|
|
struct usb_xhci_pdata {
|
|
unsigned usb3_lpm_capable:1;
|
|
+ unsigned usb3_fake_doorbell:1;
|
|
};
|
|
|
|
#endif /* __USB_CORE_XHCI_PDRIVER_H */
|
|
|