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136 lines
3.7 KiB
Diff
136 lines
3.7 KiB
Diff
From dd0e5f9a6a4aed849bdb80641c2a2350476cede7 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
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Date: Sun, 21 Jun 2015 11:10:49 +0200
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Subject: [PATCH v3 2/6] usb: xhci: add Broadcom specific fake doorbell
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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This fixes problem with controller seeing devices only in some small
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percentage of cold boots.
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This quirk is also added to the platform data so we can activate it
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when we register our platform driver.
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Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
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Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
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---
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drivers/usb/host/xhci-plat.c | 3 +++
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drivers/usb/host/xhci.c | 57 +++++++++++++++++++++++++++++++++++++---
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drivers/usb/host/xhci.h | 1 +
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include/linux/usb/xhci_pdriver.h | 1 +
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4 files changed, 59 insertions(+), 3 deletions(-)
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--- a/drivers/usb/host/xhci-plat.c
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+++ b/drivers/usb/host/xhci-plat.c
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@@ -42,6 +42,9 @@ static void xhci_plat_quirks(struct devi
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if ((node && of_property_read_bool(node, "usb3-lpm-capable")) ||
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(pdata && pdata->usb3_lpm_capable))
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xhci->quirks |= XHCI_LPM_SUPPORT;
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+
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+ if (pdata && pdata->usb3_fake_doorbell)
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+ xhci->quirks |= XHCI_FAKE_DOORBELL;
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}
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/* called during probe() after chip reset completes */
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--- a/drivers/usb/host/xhci.c
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+++ b/drivers/usb/host/xhci.c
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@@ -121,6 +121,39 @@ int xhci_halt(struct xhci_hcd *xhci)
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return ret;
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}
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+static int xhci_fake_doorbell(struct xhci_hcd *xhci, int slot_id)
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+{
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+ u32 temp;
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+
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+ /* alloc a virt device for slot */
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+ if (!xhci_alloc_virt_device(xhci, slot_id, NULL, GFP_NOIO)) {
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+ xhci_warn(xhci, "Could not allocate xHCI USB device data structures\n");
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+ return -ENOMEM;
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+ }
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+
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+ /* ring fake doorbell for slot_id ep 0 */
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+ xhci_ring_ep_doorbell(xhci, slot_id, 0, 0);
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+ usleep_range(1000, 1500);
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+
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+ /* read the status register to check if HSE is set or not? */
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+ temp = readl(&xhci->op_regs->status);
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+
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+ /* clear HSE if set */
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+ if (temp & STS_FATAL) {
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+ xhci_dbg(xhci, "HSE problem detected, status: 0x%x\n", temp);
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+ temp &= ~(0x1fff);
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+ temp |= STS_FATAL;
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+ writel(temp, &xhci->op_regs->status);
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+ usleep_range(1000, 1500);
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+ readl(&xhci->op_regs->status);
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+ }
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+
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+ /* Free virt device */
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+ xhci_free_virt_device(xhci, slot_id);
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+
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+ return 0;
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+}
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+
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/*
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* Set the run bit and wait for the host to be running.
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*/
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@@ -567,10 +600,25 @@ int xhci_init(struct usb_hcd *hcd)
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static int xhci_run_finished(struct xhci_hcd *xhci)
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{
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- if (xhci_start(xhci)) {
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- xhci_halt(xhci);
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- return -ENODEV;
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+ int err;
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+
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+ err = xhci_start(xhci);
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+ if (err) {
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+ err = -ENODEV;
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+ goto out_err;
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+ }
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+ if (xhci->quirks & XHCI_FAKE_DOORBELL) {
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+ err = xhci_fake_doorbell(xhci, 1);
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+ if (err)
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+ goto out_err;
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+
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+ err = xhci_start(xhci);
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+ if (err) {
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+ err = -ENODEV;
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+ goto out_err;
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+ }
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}
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+
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xhci->shared_hcd->state = HC_STATE_RUNNING;
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xhci->cmd_ring_state = CMD_RING_STATE_RUNNING;
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@@ -580,6 +628,9 @@ static int xhci_run_finished(struct xhci
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xhci_dbg_trace(xhci, trace_xhci_dbg_init,
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"Finished xhci_run for USB3 roothub");
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return 0;
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+out_err:
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+ xhci_halt(xhci);
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+ return err;
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}
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/*
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--- a/drivers/usb/host/xhci.h
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+++ b/drivers/usb/host/xhci.h
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@@ -1568,6 +1568,7 @@ struct xhci_hcd {
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/* For controllers with a broken beyond repair streams implementation */
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#define XHCI_BROKEN_STREAMS (1 << 19)
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#define XHCI_PME_STUCK_QUIRK (1 << 20)
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+#define XHCI_FAKE_DOORBELL (1 << 21)
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unsigned int num_active_eps;
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unsigned int limit_active_eps;
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/* There are two roothubs to keep track of bus suspend info for */
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--- a/include/linux/usb/xhci_pdriver.h
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+++ b/include/linux/usb/xhci_pdriver.h
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@@ -22,6 +22,7 @@
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*/
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struct usb_xhci_pdata {
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unsigned usb3_lpm_capable:1;
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+ unsigned usb3_fake_doorbell:1;
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};
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#endif /* __USB_CORE_XHCI_PDRIVER_H */
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