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| author | Sascha Hauer <s.hauer@pengutronix.de> | 2012-03-13 13:35:05 +0100 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2012-04-12 21:38:19 +0200 |
| commit | f70ebb28a2ae0cbfdd41dee8d55ec51b8e549986 (patch) | |
| tree | 6ede4460ada3a26afba69105a8e824f2b514c9a9 /drivers | |
| parent | 1db7717f6b2766624c9a1216fe67361245e6c59c (diff) | |
| download | barebox-f70ebb28a2ae0cbfdd41dee8d55ec51b8e549986.tar.gz barebox-f70ebb28a2ae0cbfdd41dee8d55ec51b8e549986.tar.xz | |
USB ehci: speed up initialization
This is based on the following U-Boot commit:
commit 5f4b4f2fed3ab8590c8c06b78642f8c1467acacf
Author: Vincent Palatin <vpalatin@chromium.org>
Date: Mon Dec 5 14:52:22 2011 -0800
ehci: speed up initialization
According to EHCI specification v1.0, the controller should stabilize
the power on a port at most 20 ms after the port power bit transition.
So, we put this setting in the virtual descriptor corresponding field,
(bPwrOn2PwrGood = 10 => 10 x 2ms = 20ms), this saves about 500ms at each
controller initialization/enumeration.
Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/core/usb.c | 2 | ||||
| -rw-r--r-- | drivers/usb/host/ehci-hcd.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c index 7039a2cb75..ba23e0e3a0 100644 --- a/drivers/usb/core/usb.c +++ b/drivers/usb/core/usb.c @@ -934,8 +934,8 @@ static void usb_hub_power_on(struct usb_hub_device *hub) for (i = 0; i < dev->maxchild; i++) { usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER); USB_HUB_PRINTF("port %d returns %lX\n", i + 1, dev->status); - wait_ms(hub->desc.bPwrOn2PwrGood * 2); } + mdelay(20); } #define MAX_TRIES 5 diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index 505d919701..ae2b41ed53 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -64,7 +64,7 @@ static struct descriptor { 0x29, /* bDescriptorType: hub descriptor */ 2, /* bNrPorts -- runtime modified */ 0, /* wHubCharacteristics */ - 0xff, /* bPwrOn2PwrGood */ + 10, /* bPwrOn2PwrGood */ 0, /* bHubCntrCurrent */ {}, /* Device removable */ {} /* at most 7 ports! XXX */ |