diff options
Diffstat (limited to 'sys/dev/mmc/mmc.c')
| -rw-r--r-- | sys/dev/mmc/mmc.c | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/sys/dev/mmc/mmc.c b/sys/dev/mmc/mmc.c index 712a2d3..a41d807 100644 --- a/sys/dev/mmc/mmc.c +++ b/sys/dev/mmc/mmc.c @@ -1379,6 +1379,21 @@ mmc_discover_cards(struct mmc_softc *sc) ivar->hs_tran_speed = SD_MAX_HS; } } + + /* + * We deselect then reselect the card here. Some cards + * become unselected and timeout with the above two + * commands, although the state tables / diagrams in the + * standard suggest they go back to the transfer state. + * Other cards don't become deselected, and if we + * atttempt to blindly re-select them, we get timeout + * errors from some controllers. So we deselect then + * reselect to handle all situations. The only thing we + * use from the sd_status is the erase sector size, but + * it is still nice to get that right. + */ + mmc_select_card(sc, 0); + mmc_select_card(sc, ivar->rca); mmc_app_sd_status(sc, ivar->rca, ivar->raw_sd_status); mmc_app_decode_sd_status(ivar->raw_sd_status, &ivar->sd_status); @@ -1386,7 +1401,6 @@ mmc_discover_cards(struct mmc_softc *sc) ivar->erase_sector = 16 << ivar->sd_status.au_size; } - mmc_select_card(sc, 0); /* Find max supported bus width. */ if ((mmcbr_get_caps(sc->dev) & MMC_CAP_4_BIT_DATA) && (ivar->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) @@ -1414,6 +1428,7 @@ mmc_discover_cards(struct mmc_softc *sc) child = device_add_child(sc->dev, NULL, -1); device_set_ivars(child, ivar); } + mmc_select_card(sc, 0); return; } mmc_decode_cid_mmc(ivar->raw_cid, &ivar->cid); @@ -1446,10 +1461,10 @@ mmc_discover_cards(struct mmc_softc *sc) break; } + mmc_select_card(sc, ivar->rca); + /* Only MMC >= 4.x cards support EXT_CSD. */ if (ivar->csd.spec_vers >= 4) { - /* Card must be selected to fetch EXT_CSD. */ - mmc_select_card(sc, ivar->rca); mmc_send_ext_csd(sc, ivar->raw_ext_csd); /* Handle extended capacity from EXT_CSD */ sec_count = ivar->raw_ext_csd[EXT_CSD_SEC_CNT] + @@ -1472,7 +1487,6 @@ mmc_discover_cards(struct mmc_softc *sc) ivar->hs_tran_speed = ivar->tran_speed; /* Find max supported bus width. */ ivar->bus_width = mmc_test_bus_width(sc); - mmc_select_card(sc, 0); /* Handle HC erase sector size. */ if (ivar->raw_ext_csd[EXT_CSD_ERASE_GRP_SIZE] != 0) { ivar->erase_sector = 1024 * @@ -1506,6 +1520,7 @@ mmc_discover_cards(struct mmc_softc *sc) child = device_add_child(sc->dev, NULL, -1); device_set_ivars(child, ivar); } + mmc_select_card(sc, 0); } } |
