Commit 1530bbc6 authored by Sarah Sharp's avatar Sarah Sharp

xhci: Add new short TX quirk for Fresco Logic host.

Sergio reported that when he recorded audio from a USB headset mic
plugged into the USB 3.0 port on his ASUS N53SV-DH72, the audio sounded
"robotic".  When plugged into the USB 2.0 port under EHCI on the same
laptop, the audio sounded fine.  The device is:

Bus 002 Device 004: ID 046d:0a0c Logitech, Inc. Clear Chat Comfort USB Headset

The problem was tracked down to the Fresco Logic xHCI host controller
not correctly reporting short transfers on isochronous IN endpoints.
The driver would submit a 96 byte transfer, the device would only send
88 or 90 bytes, and the xHCI host would report the transfer had a
"successful" completion code, with an untransferred buffer length of 8
or 6 bytes.

The successful completion code and non-zero untransferred length is a
contradiction.  The xHCI host is supposed to only mark a transfer as
successful if all the bytes are transferred.  Otherwise, the transfer
should be marked with a short packet completion code.  Without the EHCI
bus trace, we wouldn't know whether the xHCI driver should trust the
completion code or the untransferred length.  With it, we know to trust
the untransferred length.

Add a new xHCI quirk for the Fresco Logic host controller.  If a
transfer is reported as successful, but the untransferred length is
non-zero, print a warning.  For the Fresco Logic host, change the
completion code to COMP_SHORT_TX and process the transfer like a short
transfer.

This should be backported to stable kernels that contain the commit
f5182b41 "xhci: Disable MSI for some
Fresco Logic hosts."  That commit was marked for stable kernels as old
as 2.6.36.
Signed-off-by: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
Reported-by: default avatarSergio Correia <lists@uece.net>
Tested-by: default avatarSergio Correia <lists@uece.net>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
parent db2c8624
...@@ -72,6 +72,7 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci) ...@@ -72,6 +72,7 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
xhci_dbg(xhci, "QUIRK: Fresco Logic revision %u " xhci_dbg(xhci, "QUIRK: Fresco Logic revision %u "
"has broken MSI implementation\n", "has broken MSI implementation\n",
pdev->revision); pdev->revision);
xhci->quirks |= XHCI_TRUST_TX_LENGTH;
} }
if (pdev->vendor == PCI_VENDOR_ID_NEC) if (pdev->vendor == PCI_VENDOR_ID_NEC)
......
...@@ -1787,8 +1787,12 @@ static int process_isoc_td(struct xhci_hcd *xhci, struct xhci_td *td, ...@@ -1787,8 +1787,12 @@ static int process_isoc_td(struct xhci_hcd *xhci, struct xhci_td *td,
/* handle completion code */ /* handle completion code */
switch (trb_comp_code) { switch (trb_comp_code) {
case COMP_SUCCESS: case COMP_SUCCESS:
frame->status = 0; if (TRB_LEN(le32_to_cpu(event->transfer_len)) == 0) {
break; frame->status = 0;
break;
}
if ((xhci->quirks & XHCI_TRUST_TX_LENGTH))
trb_comp_code = COMP_SHORT_TX;
case COMP_SHORT_TX: case COMP_SHORT_TX:
frame->status = td->urb->transfer_flags & URB_SHORT_NOT_OK ? frame->status = td->urb->transfer_flags & URB_SHORT_NOT_OK ?
-EREMOTEIO : 0; -EREMOTEIO : 0;
...@@ -1885,13 +1889,16 @@ static int process_bulk_intr_td(struct xhci_hcd *xhci, struct xhci_td *td, ...@@ -1885,13 +1889,16 @@ static int process_bulk_intr_td(struct xhci_hcd *xhci, struct xhci_td *td,
switch (trb_comp_code) { switch (trb_comp_code) {
case COMP_SUCCESS: case COMP_SUCCESS:
/* Double check that the HW transferred everything. */ /* Double check that the HW transferred everything. */
if (event_trb != td->last_trb) { if (event_trb != td->last_trb ||
TRB_LEN(le32_to_cpu(event->transfer_len)) != 0) {
xhci_warn(xhci, "WARN Successful completion " xhci_warn(xhci, "WARN Successful completion "
"on short TX\n"); "on short TX\n");
if (td->urb->transfer_flags & URB_SHORT_NOT_OK) if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
*status = -EREMOTEIO; *status = -EREMOTEIO;
else else
*status = 0; *status = 0;
if ((xhci->quirks & XHCI_TRUST_TX_LENGTH))
trb_comp_code = COMP_SHORT_TX;
} else { } else {
*status = 0; *status = 0;
} }
...@@ -2050,6 +2057,13 @@ static int handle_tx_event(struct xhci_hcd *xhci, ...@@ -2050,6 +2057,13 @@ static int handle_tx_event(struct xhci_hcd *xhci,
* transfer type * transfer type
*/ */
case COMP_SUCCESS: case COMP_SUCCESS:
if (TRB_LEN(le32_to_cpu(event->transfer_len)) == 0)
break;
if (xhci->quirks & XHCI_TRUST_TX_LENGTH)
trb_comp_code = COMP_SHORT_TX;
else
xhci_warn(xhci, "WARN Successful completion on short TX: "
"needs XHCI_TRUST_TX_LENGTH quirk?\n");
case COMP_SHORT_TX: case COMP_SHORT_TX:
break; break;
case COMP_STOP: case COMP_STOP:
......
...@@ -1481,6 +1481,7 @@ struct xhci_hcd { ...@@ -1481,6 +1481,7 @@ struct xhci_hcd {
#define XHCI_RESET_ON_RESUME (1 << 7) #define XHCI_RESET_ON_RESUME (1 << 7)
#define XHCI_SW_BW_CHECKING (1 << 8) #define XHCI_SW_BW_CHECKING (1 << 8)
#define XHCI_AMD_0x96_HOST (1 << 9) #define XHCI_AMD_0x96_HOST (1 << 9)
#define XHCI_TRUST_TX_LENGTH (1 << 10)
unsigned int num_active_eps; unsigned int num_active_eps;
unsigned int limit_active_eps; unsigned int limit_active_eps;
/* There are two roothubs to keep track of bus suspend info for */ /* There are two roothubs to keep track of bus suspend info for */
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment