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