From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Roese Date: Mon, 18 Jul 2016 12:42:47 +0200 Subject: [U-Boot] xHCI on x86 In-Reply-To: References: <5785DDB4.80102@denx.de> Message-ID: <578CB2A7.6010907@denx.de> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Hi Simon, On 15.07.2016 05:19, Simon Glass wrote: > On 13 July 2016 at 00:20, Stefan Roese wrote: >> Hi! >> >> I'm currently trying to get xHCI working on some BayTrail based >> x86 boards. For this I've added DM support to xhci-pci and made a >> small change to cache.h to enable compilation of the xhci driver on >> x86 (please find those 2 patches attached - I'll send then to the >> list once this is resolved). But I noticed that the xhci driver >> hangs in xhci_queue_command() in this line: >> >> xhci_writel(&ctrl->dba->doorbell[0], DB_VALUE_HOST); >> >> when first writing to the doorbell register. Reading from this doorbell >> register still works just fine. >> >> IIRC, Simon has mentioned that xHCI still has some "issues" on x86. >> Simon, is this what you have seen as well? Does anyone have some ideas >> how to solve this? > > I'm really not sure what is wrong, sorry. The discussion about > enabling the pin settings correctly may be relevant since I believe > two GPIOs need to be set up for both ports to work, and that patch was > never cleaned up and applied, so far as I know... I see. I my case, it's not related to the GPIO issue - as the ports are not enabled via GPIO on the Congatec board where I'm currently testing on. I've updated the xHCI PCI support a bit (no hangup any more, but still not working correctly) and will post the current version as WIP today, as I need to switch to some other tasks for a while. Perhaps someone else is interested in xHCI on x86 enough to take a look at it in the meantime... Thanks, Stefan