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| author |   Jiahau Chang <jiahau@gmail.com> | 2017-07-20 14:48:27 +0300 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-07-20 14:40:35 +0200 |
| commit | 9da5a1092b13468839b1a864b126cacfb72ad016 (patch) | |
| tree | 150639fa1c21c53e0d6988bd3b2f5d1a10e2e904 /drivers/usb/host/xhci.h | |
| parent | xhci: Fix NULL pointer dereference when cleaning up streams for removed host (diff) | |
| download | linux-dev-9da5a1092b13468839b1a864b126cacfb72ad016.tar.xz linux-dev-9da5a1092b13468839b1a864b126cacfb72ad016.zip | |
xhci: Bad Ethernet performance plugged in ASM1042A host
When USB Ethernet is plugged in ASMEDIA ASM1042A xHCI host, bad
performance was manifesting in Web browser use (like download
large file such as ISO image). It is known limitation of
ASM1042A that is not compatible with driver scheduling,
As a workaround we can modify flow control handling of ASM1042A.
The register we modify is changes the behavior
[use quirk bit 28, usleep_range 40-60us, empty non-pci function -Mathias]
Cc: <stable@vger.kernel.org>
Signed-off-by: Jiahau Chang <Lars_chang@asmedia.com.tw>
Signed-off-by: Ian Pilcher <arequipeno@gmail.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to '')
| -rw-r--r-- | drivers/usb/host/xhci.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index 3c6da1f93c84..e3e935291ed6 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1820,6 +1820,7 @@ struct xhci_hcd { #define XHCI_BROKEN_PORT_PED (1 << 25) #define XHCI_LIMIT_ENDPOINT_INTERVAL_7 (1 << 26) #define XHCI_U2_DISABLE_WAKE (1 << 27) +#define XHCI_ASMEDIA_MODIFY_FLOWCONTROL (1 << 28) unsigned int num_active_eps; unsigned int limit_active_eps; |