[PATCH V14 08/24] mmc: block: Check for transfer state in card_busy_detect()

Adrian Hunter
2017-11-21T13:42:34Z

The card is required to return to transfer state. Since that is the state
required to start another transfer, check for that state instead of
programming state.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
drivers/mmc/core/block.c | 17 +++++++++++++----
1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 0874ab3e5c92..130ce94fdaf2 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -948,6 +948,16 @@ static unsigned long mmc_blk_data_timeout_jiffies(struct mmc_host *host,
return msecs_to_jiffies(ms);
}

+static inline bool mmc_blk_in_tran_state(u32 status)
+{
+ /*
+ * Some cards mishandle the status bits, so make sure to check both the
+ * busy indication and the card state.
+ */
+ return status & R1_READY_FOR_DATA &&
+ (R1_CURRENT_STATE(status) == R1_STATE_TRAN);
+}
+
static int card_busy_detect(struct mmc_card *card, bool hw_busy_detect,
struct request *req, bool *gen_err)
{
@@ -985,9 +995,9 @@ static int card_busy_detect(struct mmc_card *card, bool hw_busy_detect,
* leaves the program state.
*/
if (done) {
- pr_err("%s: Card stuck in programming state! %s %s\n",
+ pr_err("%s: Card stuck in wrong state! %s %s status: %#x\n",
mmc_hostname(card->host),
- req->rq_disk->disk_name, __func__);
+ req->rq_disk->disk_name, __func__, status);
return -ETIMEDOUT;
}

@@ -996,8 +1006,7 @@ static int card_busy_detect(struct mmc_card *card, bool hw_busy_detect,
* so make sure to check both the busy
* indication and the card state.
*/
- } while (!(status & R1_READY_FOR_DATA) ||
- (R1_CURRENT_STATE(status) == R1_STATE_PRG));
+ } while (!mmc_blk_in_tran_state(status));

return err;
}
--
1.9.1