From cc17c01f2d3b691ddadbd46727d5f22db0a90808 Mon Sep 17 00:00:00 2001
From: Andrew Gabbasov <andrew_gabbasov@mentor.com>
Date: Thu, 19 Mar 2015 07:44:05 -0500
Subject: [PATCH] mmc: Continue polling MMC card for OCR only if it is still
not ready
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_gabbasov@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 d073d7900c..42af47c4c2 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;
--
2.39.5