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
