diff options
Diffstat (limited to 'target/linux/bcm53xx/patches-4.4/191-usb-xhci-add-Broadcom-specific-fake-doorbell.patch')
| -rw-r--r-- | target/linux/bcm53xx/patches-4.4/191-usb-xhci-add-Broadcom-specific-fake-doorbell.patch | 135 |
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 */ |