Hi Wolfram, On Fri, Jun 18, 2021 at 11:36 AM Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx> wrote: > > In v5.10, v5.11, and v512, it works fine: > > > > sh_mobile_sdhi ee100000.mmc: timeout waiting for hardware interrupt (CMD19) > > mmc0: new ultra high speed SDR104 SDHC card at address aaaa > > mmcblk0: mmc0:aaaa SM32G 29.7 GiB > > mmcblk0: p1 > > > > Note that I do see one timeout during identification. > > > > After b4d86f37eacb7246 (bisected), it fails: > > > > sh_mobile_sdhi ee100000.mmc: timeout waiting for hardware interrupt (CMD19) > > sh_mobile_sdhi ee100000.mmc: timeout waiting for hardware interrupt (CMD19) > > [...] > > sh_mobile_sdhi ee100000.mmc: timeout waiting for hardware interrupt (CMD19) > > mmc0: tuning execution failed: -5 > > mmc0: error -5 whilst initialising SD card > > sh_mobile_sdhi ee100000.mmc: timeout waiting for hardware interrupt (CMD19) > > sh_mobile_sdhi ee100000.mmc: timeout waiting for hardware interrupt (CMD19) > > [...] > > > > Given the single timeout I see with older kernels, the issue may be that the > > harder reset causes that timeout to repeat ad infinitum? > > I can confirm this. I also found a SanDisk card which shows the same > issue on my Lager board. However, I wouldn't say this patch breaks > things in a way that a revert is a good solution. > > The card does not really work "fine". During probe we get one timeout, > and when trying to read from the card, more follow. Already before this > patch. There seems to be a state where an initial command fails and only > the retry suceeds. The hard reset in deed seems to cause an endless loop > here. However, the proper fix is to find out why this first command > fails, especially only with some cards. My Samsung one works 100% fine. BTW, does it work (really) fine on R-Car Gen3? Mine does. > And if we fix this, then the hard reset is still good for Gen2 as well. > > Makes sense? True. Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds