diff options
Diffstat (limited to 'drivers/mmc/core/sd.c')
| -rw-r--r-- | drivers/mmc/core/sd.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c index 265e1aeeb9d8..d3d32f9a2cb1 100644 --- a/drivers/mmc/core/sd.c +++ b/drivers/mmc/core/sd.c @@ -221,6 +221,14 @@ static int mmc_decode_scr(struct mmc_card *card) if (scr->sda_spec3) scr->cmds = UNSTUFF_BITS(resp, 32, 2); + + /* SD Spec says: any SD Card shall set at least bits 0 and 2 */ + if (!(scr->bus_widths & SD_SCR_BUS_WIDTH_1) || + !(scr->bus_widths & SD_SCR_BUS_WIDTH_4)) { + pr_err("%s: invalid bus width\n", mmc_hostname(card->host)); + return -EINVAL; + } + return 0; } |