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30 lines
1.0 KiB
Diff
30 lines
1.0 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Brian King <brking@linux.vnet.ibm.com>
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Date: Wed, 25 Oct 2017 10:42:59 +1100
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Subject: [PATCH 1/2] xhci: Reset controller on xhci shutdown
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Fixes kexec boot. Without a hard reset, some USB chips will fail to
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initialize in a kexec booted kernel.
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Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
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Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>
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Signed-off-by: Joel Stanley <joel@jms.id.au>
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---
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drivers/usb/host/xhci.c | 3 +++
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1 file changed, 3 insertions(+)
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diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
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index 473b0b64dd57..ca0c642ce935 100644
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--- a/drivers/usb/host/xhci.c
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+++ b/drivers/usb/host/xhci.c
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@@ -812,6 +812,9 @@ void xhci_shutdown(struct usb_hcd *hcd)
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xhci_dbg_trace(xhci, trace_xhci_dbg_init,
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"xhci_shutdown completed - status = %x",
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readl(&xhci->op_regs->status));
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+
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+ /* TI XHCI controllers do not come back after kexec without this hack */
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+ pci_reset_function_locked(to_pci_dev(hcd->self.sysdev));
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}
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EXPORT_SYMBOL_GPL(xhci_shutdown);
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