diff options
| -rw-r--r-- | drivers/mmc/core/mmc_ops.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c index e025604e17d4..da424dcb57ad 100644 --- a/drivers/mmc/core/mmc_ops.c +++ b/drivers/mmc/core/mmc_ops.c @@ -456,6 +456,7 @@ static int mmc_poll_for_busy(struct mmc_card *card, unsigned int timeout_ms, struct mmc_host *host = card->host; int err; unsigned long timeout; + unsigned int udelay = 32, udelay_max = 32768; u32 status = 0; bool expired = false; bool busy = false; @@ -500,6 +501,13 @@ static int mmc_poll_for_busy(struct mmc_card *card, unsigned int timeout_ms, mmc_hostname(host), __func__); return -ETIMEDOUT; } + + /* Throttle the polling rate to avoid hogging the CPU. */ + if (busy) { + usleep_range(udelay, udelay * 2); + if (udelay < udelay_max) + udelay *= 2; + } } while (busy); return 0; |