mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-19 13:47:56 +00:00
01d7c07920
- intel_fb: avoid pagefault in fliphandler - usb_host: avoid hang of usb xhci hardware Fixes #4556
72 lines
3.0 KiB
Diff
72 lines
3.0 KiB
Diff
From 09f736aa95476631227d2dc0e6b9aeee1ad7ed58 Mon Sep 17 00:00:00 2001
|
|
From: Mathias Nyman <mathias.nyman@linux.intel.com>
|
|
Date: Fri, 26 Nov 2021 14:23:40 +0200
|
|
Subject: xhci: Fix commad ring abort, write all 64 bits to CRCR register.
|
|
|
|
Turns out some xHC controllers require all 64 bits in the CRCR register
|
|
to be written to execute a command abort.
|
|
|
|
The lower 32 bits containing the command abort bit is written first.
|
|
In case the command ring stops before we write the upper 32 bits then
|
|
hardware may use these upper bits to set the commnd ring dequeue pointer.
|
|
|
|
Solve this by making sure the upper 32 bits contain a valid command
|
|
ring dequeue pointer.
|
|
|
|
The original patch that only wrote the first 32 to stop the ring went
|
|
to stable, so this fix should go there as well.
|
|
|
|
Fixes: ff0e50d3564f ("xhci: Fix command ring pointer corruption while aborting a command")
|
|
Cc: stable@vger.kernel.org
|
|
Tested-by: Pavankumar Kondeti <quic_pkondeti@quicinc.com>
|
|
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
|
|
Link: https://lore.kernel.org/r/20211126122340.1193239-2-mathias.nyman@linux.intel.com
|
|
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
---
|
|
drivers/usb/host/xhci-ring.c | 21 ++++++++++++++-------
|
|
1 file changed, 14 insertions(+), 7 deletions(-)
|
|
|
|
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
|
|
index 311597bba80e2..eaa49aef29352 100644
|
|
--- a/drivers/usb/host/xhci-ring.c
|
|
+++ b/drivers/usb/host/xhci-ring.c
|
|
@@ -366,7 +366,9 @@ static void xhci_handle_stopped_cmd_ring(struct xhci_hcd *xhci,
|
|
/* Must be called with xhci->lock held, releases and aquires lock back */
|
|
static int xhci_abort_cmd_ring(struct xhci_hcd *xhci, unsigned long flags)
|
|
{
|
|
- u32 temp_32;
|
|
+ struct xhci_segment *new_seg = xhci->cmd_ring->deq_seg;
|
|
+ union xhci_trb *new_deq = xhci->cmd_ring->dequeue;
|
|
+ u64 crcr;
|
|
int ret;
|
|
|
|
xhci_dbg(xhci, "Abort command ring\n");
|
|
@@ -375,13 +377,18 @@ static int xhci_abort_cmd_ring(struct xhci_hcd *xhci, unsigned long flags)
|
|
|
|
/*
|
|
* The control bits like command stop, abort are located in lower
|
|
- * dword of the command ring control register. Limit the write
|
|
- * to the lower dword to avoid corrupting the command ring pointer
|
|
- * in case if the command ring is stopped by the time upper dword
|
|
- * is written.
|
|
+ * dword of the command ring control register.
|
|
+ * Some controllers require all 64 bits to be written to abort the ring.
|
|
+ * Make sure the upper dword is valid, pointing to the next command,
|
|
+ * avoiding corrupting the command ring pointer in case the command ring
|
|
+ * is stopped by the time the upper dword is written.
|
|
*/
|
|
- temp_32 = readl(&xhci->op_regs->cmd_ring);
|
|
- writel(temp_32 | CMD_RING_ABORT, &xhci->op_regs->cmd_ring);
|
|
+ next_trb(xhci, NULL, &new_seg, &new_deq);
|
|
+ if (trb_is_link(new_deq))
|
|
+ next_trb(xhci, NULL, &new_seg, &new_deq);
|
|
+
|
|
+ crcr = xhci_trb_virt_to_dma(new_seg, new_deq);
|
|
+ xhci_write_64(xhci, crcr | CMD_RING_ABORT, &xhci->op_regs->cmd_ring);
|
|
|
|
/* Section 4.6.1.2 of xHCI 1.0 spec says software should also time the
|
|
* completion of the Command Abort operation. If CRR is not negated in 5
|
|
--
|
|
cgit
|
|
|