diff options
| author | Bryan O'Donoghue <bryan.odonoghue@intel.com> | 2014-07-02 01:58:18 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-09-05 16:34:12 -0700 |
| commit | 5d2ce3661231cdd37d7a504703507f8fefc6a3cb (patch) | |
| tree | 6d0ae4b15267a702f097e6d7097c69b85309ca82 /net | |
| parent | 42bd4b30dac9e4a0976a4b7363398454b3e4f7d7 (diff) | |
USB: ehci-pci: USB host controller support for Intel Quark X1000
commit 6e693739e9b603b3ca9ce0d4f4178f0633458465 upstream.
The EHCI packet buffer in/out threshold is programmable for Intel Quark X1000
USB host controller, and the default value is 0x20 dwords. The in/out threshold
can be programmed to 0x80 dwords (512 Bytes) to maximize the perfomrance,
but only when isochronous/interrupt transactions are not initiated by the USB
host controller. This patch is to reconfigure the packet buffer in/out
threshold as maximal as possible to maximize the performance, and 0x7F dwords
(508 Bytes) should be used because the USB host controller initiates
isochronous/interrupt transactions.
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@intel.com>
Signed-off-by: Alvin (Weike) Chen <alvin.chen@intel.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Reviewed-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
0 files changed, 0 insertions, 0 deletions