diff options
Diffstat (limited to 'drivers/mmc/core/core.c')
| -rw-r--r-- | drivers/mmc/core/core.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index 88fd231fee1d..860378bea557 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -1398,6 +1398,29 @@ void mmc_power_cycle(struct mmc_host *host, u32 ocr) mmc_power_up(host, ocr); } +/** + * mmc_handle_undervoltage - Handle an undervoltage event on the MMC bus + * @host: The MMC host that detected the undervoltage condition + * + * This function is called when an undervoltage event is detected on one of + * the MMC regulators. + * + * Returns: 0 on success or a negative error code on failure. + */ +int mmc_handle_undervoltage(struct mmc_host *host) +{ + /* Stop the host to prevent races with card removal */ + __mmc_stop_host(host); + + if (!host->bus_ops || !host->bus_ops->handle_undervoltage) + return 0; + + dev_warn(mmc_dev(host), "%s: Undervoltage detected, initiating emergency stop\n", + mmc_hostname(host)); + + return host->bus_ops->handle_undervoltage(host); +} + /* * Assign a mmc bus handler to a host. Only one bus handler may control a * host at any given time. |