Hi, This is not the issue, since the problem has been observed with eMMC too, and is sporadic in nature. Please could you answer the question posed: are the eSDHC controllers DMA coherent or are they not coherent? Thanks. On Thu, Sep 19, 2019 at 04:13:20AM +0000, Y.b. Lu wrote: > Sorry. My email was rejected by mailing lists. Let me re-send. > > Hi Russell, > > I’m not sure what board you were using for LX2160A. > We had an known issue for eSDHC controller and all NXP Layerscape RDB boards. > eSDHC couldn’t provide power-cycle to SD card, and even worse, board reset couldn’t provide power-cycle to SD card either. > But for UHS-I SD card, it’s required to have a power-cycle to reset card if it goes into UHS-I mode. Otherwise, we don’t know what will happen when kernel initializes SD card after a reboot/reset. > > I could reproduce that issue with below steps on latest mainline kernel. > 1. Power off board, and power on board. > 2. Start up kernel, the SD card works fine in UHS-I mode. > 3. Reboot/reset board. (This couldn’t provide power-cycle to SD card) > 4. Start up kernel, the SD card gets that ADMA error issue. > > So could you have a try to power off/power on the board, and then start up kernel. Don’t use reboot, or board reset button. > Or you can remove SD card and start up kernel, and insert SD card when kernel has been started up. > Thanks a lot. > > Best regards, > Yangbo Lu > > > From: Li Yang <leoyang.li@xxxxxxx> > Sent: Wednesday, September 18, 2019 1:48 AM > To: Fabio Estevam <festevam@xxxxxxxxx>; Y.b. Lu <yangbo.lu@xxxxxxx> > Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>; Christoph Hellwig <hch@xxxxxx>; Linux ARM <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>; Nicolin Chen <nicoleotsuka@xxxxxxxxx>; Russell King - ARM Linux admin <linux@xxxxxxxxxxxxxxx>; Will Deacon <will.deacon@xxxxxxx>; dann frazier <dann.frazier@xxxxxxxxxxxxx>; linux-mmc <linux-mmc@xxxxxxxxxxxxxxx> > Subject: Re: [REGRESSION] sdhci no longer detects SD cards on LX2160A > > > > On Tue, Sep 17, 2019 at 6:31 PM Fabio Estevam <mailto:festevam@xxxxxxxxx> wrote: > [Adding Li Yang] > > On Tue, Sep 17, 2019 at 10:52 AM Russell King - ARM Linux admin > <mailto:linux@xxxxxxxxxxxxxxx> wrote: > > > The pressing question seems to be this: > > > > Are the eSDHC on the LX2160A DMA coherent or are they not? > > > > Any chances of finding out internally what the true answer to that, > > rather than me poking about trying stuff experimentally? Having a > > definitive answer for a potentially data-corrupting change would > > be really good... > > Li Yang, > > Could you please help to confirm Russell's question? > Adding Yangbo who is working on SDHC. > > Regards, > Leo -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up According to speedtest.net: 11.9Mbps down 500kbps up
