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 <vpala...@chromium.org>
---
drivers/usb/host/ehci-hcd.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 2197119..caa0cfb 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -48,7 +48,7 @@ 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 */
--
1.7.3.1
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