Hi Wolfgang, > -----Original Message----- > From: Wolfgang Denk [mailto:[email protected]] > Sent: Monday, December 14, 2009 2:42 PM > To: David Mitchell > Cc: [email protected]; Stefan Roese; Jeff Mann > Subject: Re: [U-Boot] [PATCH] ppc4xx: Canyonlands: Fix USB host PHY > reset sequence > > > - /* Enable USB host & USB-OTG */ > > + /* Enable USB host & USB-OTG;force assert,then de-assert PHY > reset */ > > + out_8((void *)CONFIG_SYS_BCSR_BASE + 7, 1); > > + mdelay(100); > > out_8((void *)CONFIG_SYS_BCSR_BASE + 7, 0); > > + mdealy(100); > > It would have been nice if you had at least tried to compile that. > "mdealy()" is a typo, right?
Ah, sorry about that. I had the patch hanging around and moved it up to the ToT by hand. I'll fix and re-submit. > > And do we really need 200 milliseconds delay? I generated several versions for a remote team to test (I don't have the failing hardware). Only the 100ms version worked every time. I did request a hardware investigation to clarify the 100ms delays. They reported the time was needed for the power to stabilize. > > Some customers who care about boot times will not be happy about such > an aditional delay. You add this code do board_early_init_f() which > always gets executed. But actually this is only needed when we want to > use the USB port in U-Boot, right? So this should be added to the USB > init code, and not to the common code. Actually we need the reset prior to Linux boot as well. Otherwise Linux will not discover attached devices. Which is the whole reason for the patch... Best regards, -DM -------------------------------------------------------- CONFIDENTIALITY NOTICE: This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and contains information that is confidential and proprietary to AppliedMicro Corporation or its subsidiaries. It is to be used solely for the purpose of furthering the parties' business relationship. All unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
