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-rw-r--r--target/linux/bcm53xx/patches-4.4/191-usb-xhci-add-Broadcom-specific-fake-doorbell.patch135
1 files changed, 135 insertions, 0 deletions
diff --git a/target/linux/bcm53xx/patches-4.4/191-usb-xhci-add-Broadcom-specific-fake-doorbell.patch b/target/linux/bcm53xx/patches-4.4/191-usb-xhci-add-Broadcom-specific-fake-doorbell.patch
new file mode 100644
index 0000000000..c54cecb133
--- /dev/null
+++ b/target/linux/bcm53xx/patches-4.4/191-usb-xhci-add-Broadcom-specific-fake-doorbell.patch
@@ -0,0 +1,135 @@
+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
+@@ -52,6 +52,9 @@ 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
+@@ -1630,6 +1630,7 @@ 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 */