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94 lines
2.6 KiB
94 lines
2.6 KiB
From 9cc14ca0aae53c16d10ffea49848ac61a5015562 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] 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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Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
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---
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drivers/usb/host/xhci.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++++
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1 file changed, 62 insertions(+)
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--- a/drivers/usb/host/xhci.c
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+++ b/drivers/usb/host/xhci.c
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@@ -122,6 +122,64 @@ int xhci_halt(struct xhci_hcd *xhci)
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return ret;
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}
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+#ifdef CONFIG_ARCH_BCM_5301X
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+int xhci_fake_doorbell(struct xhci_hcd *xhci, int slot_id)
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+{
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+ unsigned int temp1, ret;
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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, 0, GFP_NOIO)) {
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+ xhci_warn(xhci, "Could not allocate xHCI USB device data structures\n");
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+ return 1;
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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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+ mdelay(1);
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+
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+ /* read the status register to check if HSE is set or not? */
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+ temp1 = readl(&xhci->op_regs->status);
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+ xhci_dbg(xhci, "op reg status = %x\n",temp1);
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+
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+ /* clear HSE if set */
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+ if(temp1 & STS_FATAL) {
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+ xhci_dbg(xhci, "HSE problem detected\n");
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+ temp1 &= ~(0x1fff);
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+ temp1 |= STS_FATAL;
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+ xhci_dbg(xhci, "temp1=%x\n",temp1);
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+ writel(temp1, &xhci->op_regs->status);
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+ mdelay(1);
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+ temp1 = readl(&xhci->op_regs->status);
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+ xhci_dbg(xhci, "After clear op reg status=%x\n", temp1);
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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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+ /* Run the controller if needed */
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+ temp1 = readl(&xhci->op_regs->command);
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+ if (temp1 & CMD_RUN)
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+ return 0;
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+ temp1 |= (CMD_RUN);
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+
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+ writel(temp1, &xhci->op_regs->command);
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+ /*
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+ * Wait for the HCHalted Status bit to be 0 to indicate the host is running.
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+ */
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+ ret = xhci_handshake(xhci, &xhci->op_regs->status,
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+ STS_HALT, 0, XHCI_MAX_HALT_USEC);
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+
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+ if (ret == -ETIMEDOUT) {
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+ xhci_err(xhci, "Host took too long to start, "
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+ "waited %u microseconds.\n",
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+ XHCI_MAX_HALT_USEC);
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+ return 1;
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+ }
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+
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+ return 0;
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+}
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+#endif /* CONFIG_ARCH_BCM_5301X */
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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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@@ -146,6 +204,10 @@ static int xhci_start(struct xhci_hcd *x
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xhci_err(xhci, "Host took too long to start, "
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"waited %u microseconds.\n",
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XHCI_MAX_HALT_USEC);
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+#ifdef CONFIG_ARCH_BCM_5301X
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+ xhci_fake_doorbell(xhci, 1);
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+#endif /* CONFIG_ARCH_BCM_5301X */
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+
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if (!ret)
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xhci->xhc_state &= ~XHCI_STATE_HALTED;
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return ret;
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