This gets the sdmmc i/o reset working. Now on my allwinner,sun5i-r8 the wifi device also attaches again after a reboot (currently just works on cold boot).
ok? Index: sdmmc_io.c =================================================================== RCS file: /cvs/src/sys/dev/sdmmc/sdmmc_io.c,v retrieving revision 1.26 diff -u -p -r1.26 sdmmc_io.c --- sdmmc_io.c 12 May 2016 15:26:42 -0000 1.26 +++ sdmmc_io.c 11 Sep 2016 07:33:36 -0000 @@ -113,9 +113,6 @@ sdmmc_io_enable(struct sdmmc_softc *sc) return 1; } - /* Reset I/O functions (again). */ - sdmmc_io_reset(sc); - /* Send the new OCR value until all cards are ready. */ if (sdmmc_io_send_op_cond(sc, host_ocr, NULL) != 0) { printf("%s: can't send I/O OCR\n", DEVNAME(sc)); @@ -550,10 +547,13 @@ sdmmc_io_xchg(struct sdmmc_softc *sc, st void sdmmc_io_reset(struct sdmmc_softc *sc) { -#if 0 /* XXX command fails */ - (void)sdmmc_io_write(sc, NULL, SD_IO_REG_CCCR_CTL, CCCR_CTL_RES); - sdmmc_delay(100000); -#endif + u_int8_t data = CCCR_CTL_RES; + + rw_assert_wrlock(&sc->sc_lock); + + if (sdmmc_io_rw_direct(sc, NULL, SD_IO_CCCR_CTL, (u_char *)&data, + SD_ARG_CMD52_WRITE) == 0) + sdmmc_delay(100000); } /*