From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marek Vasut Date: Tue, 7 Apr 2015 15:51:51 +0200 Subject: [U-Boot] Regarding patch: http://patchwork.ozlabs.org/patch/373593/ In-Reply-To: References: <201504061711.37768.marex@denx.de> Message-ID: <201504071551.51587.marex@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 On Tuesday, April 07, 2015 at 08:18:03 AM, Ramneek Mehresh wrote: [...] > > Hi, > > > > Is this similar hardware bug to the one which MX6 PCIe is suffering ? On > > MX6, the bug is that you cannot reset the PCIe and PCIe PHY from > > software, which means that if you start PCIe in U-Boot, you cannot > > reliably use it in Linux. Furthermore, if you reset the MX6 via WDT, you > > cannot start PCIe reliably in Linux even if PCIe is not used in U-Boot > > at all. > > > > Is this the same type of hardware screwup where the design team didn't > > think reset was necessary? > > I have raised request for this feature in up-coming socs, and they have > agreed to provide phy shut-down in future revs. However, this support is > not available in current revs for which the code is sent. What do you > suggest we should do for current socs? Hi, I don't know, but doesn't leaving the USB running cause trouble to Linux? I think you should at least document the reasoning why the USB stop is not implemented for this broken hardware. Best regards, Marek Vasut