target/linux/layerscape/patches-5.4/820-usb-0013-MLK-9785-1-usb-host-ehci-hcd-enable-park-mode.patch

   1 From df4f2de9834b02c58bc59cbd6c148db03fcbaba5 Mon Sep 17 00:00:00 2001
   2 From: Peter Chen <peter.chen@freescale.com>
   3 Date: Tue, 4 Nov 2014 20:46:15 +0800
   4 Subject: [PATCH] MLK-9785-1 usb: host: ehci-hcd: enable park mode
   5
   6 Enable park mode will improve the performance a lot at USB ethernet use
   7 case, but a little at USB mass storage use case, and it is not harm from
   8 the tests. Below the performance comparison at imx6sl:
   9
  10 USB Ethernet (Mbps)
  11         Default                 Enable Park
  12 TX      192                     262
  13 RX      262                     290
  14
  15 USB Mass Storage (MB/s)
  16 Read    21.8                    22.9
  17 Write   19.5                    22.8
  18
  19 This patch is used for freescale internal.
  20
  21 Signed-off-by: Peter Chen <peter.chen@freescale.com>
  22 (cherry picked from commit b2289a78958859cff37508e4db0314463f33c2e0)
  23 (cherry picked from commit 233f37db41b01b0f827b91422711642228371615)
  24 ---
  25  drivers/usb/host/ehci-hcd.c | 2 +-
  26  1 file changed, 1 insertion(+), 1 deletion(-)
  27
  28 --- a/drivers/usb/host/ehci-hcd.c
  29 +++ b/drivers/usb/host/ehci-hcd.c
  30 @@ -81,7 +81,7 @@ module_param (log2_irq_thresh, int, S_IR
  31  MODULE_PARM_DESC (log2_irq_thresh, "log2 IRQ latency, 1-64 microframes");
  32
  33  /* initial park setting:  slower than hw default */
  34 -static unsigned park = 0;
  35 +static unsigned park = 3;
  36  module_param (park, uint, S_IRUGO);
  37  MODULE_PARM_DESC (park, "park setting; 1-3 back-to-back async packets");
  38