diff options
Diffstat (limited to 'drivers/mmc/core/sd_ops.c')
| -rw-r--r-- | drivers/mmc/core/sd_ops.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/mmc/core/sd_ops.c b/drivers/mmc/core/sd_ops.c index 021fed153804..b06781e69ce3 100644 --- a/drivers/mmc/core/sd_ops.c +++ b/drivers/mmc/core/sd_ops.c @@ -389,3 +389,29 @@ int mmc_app_sd_status(struct mmc_card *card, void *ssr) return 0; } + +int mmc_send_speed_class_ctrl(struct mmc_host *host, + unsigned int speed_class_ctrl_arg) +{ + int err = 0; + struct mmc_command cmd = { + .opcode = SD_SPEED_CLASS_CONTROL, + .arg = (speed_class_ctrl_arg << 28), + .flags = MMC_RSP_R1B | MMC_CMD_AC | MMC_RSP_BUSY, + }; + + BUG_ON(!host); + BUG_ON(speed_class_ctrl_arg > 3); + err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES); + if (err) + return err; + + /* + * If the host does not wait while the card signals busy, then we will + * will have to wait the max busy indication timeout. + */ + if (!(host->caps & MMC_CAP_WAIT_WHILE_BUSY)) + mmc_delay(1000); + return err; +} + |