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39 lines
1.3 KiB
Diff
39 lines
1.3 KiB
Diff
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From df4f2de9834b02c58bc59cbd6c148db03fcbaba5 Mon Sep 17 00:00:00 2001
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From: Peter Chen <peter.chen@freescale.com>
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Date: Tue, 4 Nov 2014 20:46:15 +0800
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Subject: [PATCH] MLK-9785-1 usb: host: ehci-hcd: enable park mode
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Enable park mode will improve the performance a lot at USB ethernet use
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case, but a little at USB mass storage use case, and it is not harm from
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the tests. Below the performance comparison at imx6sl:
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USB Ethernet (Mbps)
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Default Enable Park
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TX 192 262
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RX 262 290
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USB Mass Storage (MB/s)
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Read 21.8 22.9
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Write 19.5 22.8
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This patch is used for freescale internal.
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Signed-off-by: Peter Chen <peter.chen@freescale.com>
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(cherry picked from commit b2289a78958859cff37508e4db0314463f33c2e0)
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(cherry picked from commit 233f37db41b01b0f827b91422711642228371615)
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---
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drivers/usb/host/ehci-hcd.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/drivers/usb/host/ehci-hcd.c
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+++ b/drivers/usb/host/ehci-hcd.c
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@@ -80,7 +80,7 @@ module_param (log2_irq_thresh, int, S_IR
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MODULE_PARM_DESC (log2_irq_thresh, "log2 IRQ latency, 1-64 microframes");
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/* initial park setting: slower than hw default */
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-static unsigned park = 0;
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+static unsigned park = 3;
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module_param (park, uint, S_IRUGO);
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MODULE_PARM_DESC (park, "park setting; 1-3 back-to-back async packets");
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