Certain SD cards respond with an invalid response (ie,. response
not defined in the SD protocol) during block reads when the
OUT_OF_RANGE data token is sent back from the card at the same time
as the host sends a STOP_TRANSMISSION command (CMD12). As a result,
the card enters a bad state which leads to rejecting any subsequent
commands until the card is reset.
Synchronize with the subsequent data token for every block read before
issuing a STOP_TRANSMISSION command (CMD12). The synchronization is
done by issuing 0xff bytes until a data token is received.
Signed-off-by: Johnson Thomas <johnsontho...@nanometrics.ca>
---
drivers/mmc/host/mmc_spi.c | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c
index 7c1e16a..7703a15 100644
--- a/drivers/mmc/host/mmc_spi.c
+++ b/drivers/mmc/host/mmc_spi.c
@@ -984,6 +984,14 @@ mmc_spi_data_do(struct mmc_spi_host *host, struct
mmc_command *cmd,
}
}
+ if (direction == DMA_FROM_DEVICE && multiple) {
+ int status = mmc_spi_readtoken(host, timeout);
+ if (status < 0)
+ dev_dbg(&spi->dev,
+ "read error for data token, returned status:
0x%02x (%d)\n",
+ status, status);
+ }
+
/* NOTE some docs describe an MMC-only SET_BLOCK_COUNT (CMD23) that
* can be issued before multiblock writes. Unlike its more widely
* documented analogue for SD cards (SET_WR_BLK_ERASE_COUNT, ACMD23),
--
1.7.1
--
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