From df4f2de9834b02c58bc59cbd6c148db03fcbaba5 Mon Sep 17 00:00:00 2001 From: Peter Chen 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 (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");