Some MMC cards come to ready state quite quickly, so that the respective
flag appears to be set in mmc_send_op_cond already. In this case trying
to continue polling the card with CMD1 in mmc_complete_op_cond is incorrect
and may lead to unpredictable results. So check the flag before polling
and skip it appropriately.
Signed-off-by: Andrew Gabbasov <andrew_gabba...@mentor.com>
---
drivers/mmc/mmc.c | 20 +++++++++++---------
1 file changed, 11 insertions(+), 9 deletions(-)
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index d073d79..42af47c 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -403,15 +403,17 @@ static int mmc_complete_op_cond(struct mmc *mmc)
int err;
mmc->op_cond_pending = 0;
- start = get_timer(0);
- do {
- err = mmc_send_op_cond_iter(mmc, 1);
- if (err)
- return err;
- if (get_timer(start) > timeout)
- return UNUSABLE_ERR;
- udelay(100);
- } while (!(mmc->ocr & OCR_BUSY));
+ if (!(mmc->ocr & OCR_BUSY)) {
+ start = get_timer(0);
+ do {
+ err = mmc_send_op_cond_iter(mmc, 1);
+ if (err)
+ return err;
+ if (get_timer(start) > timeout)
+ return UNUSABLE_ERR;
+ udelay(100);
+ } while (!(mmc->ocr & OCR_BUSY));
+ }
if (mmc_host_is_spi(mmc)) { /* read OCR for spi */
cmd.cmdidx = MMC_CMD_SPI_READ_OCR;
--
2.1.0
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