| 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"); |
| |