On Mon, Feb 27, 2012 at 11:45:28PM +0100, Robert Jarzmik wrote:
> If a read or write operation encounters an error, the card
> might stay in "recv" or "data" state, and never get back to
> "tran" state.
>
> In these cases, the host is required to send a CMD12 (end
> transmission) to switch the FSM of the card back to "tran"
> state, as described in MMC Specification, chapter "Data
> Transfer Mode".
>
> Signed-off-by: Robert Jarzmik <robert.jarzmik@xxxxxxx>
> ---
> drivers/mci/mci-core.c | 31 ++++++++++---------------------
> 1 files changed, 10 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/mci/mci-core.c b/drivers/mci/mci-core.c
> index 0bf4449..6432391 100644
> --- a/drivers/mci/mci-core.c
> +++ b/drivers/mci/mci-core.c
> @@ -101,7 +101,7 @@ static int mci_set_blocklen(struct mci *mci, unsigned len)
> static void *sector_buf;
>
> /**
> - * Write one block of data to the card
> + * Write one or several blocks of data to the card
> * @param mci_dev MCI instance
> * @param src Where to read from to write to the card
> * @param blocknum Block number to write
> @@ -140,23 +140,17 @@ static int mci_block_write(struct mci *mci, const void *src, int blocknum,
> data.flags = MMC_DATA_WRITE;
>
> ret = mci_send_cmd(mci, &cmd, &data);
> - if (ret)
> - return ret;
> -
> - if (blocks > 1) {
> - mci_setup_cmd(&cmd,
> - MMC_CMD_STOP_TRANSMISSION,
> - 0, MMC_RSP_R1b);
> - ret = mci_send_cmd(mci, &cmd, NULL);
> - if (ret)
> - return ret;
> +
> + if (ret || blocks > 1) {
> + mci_setup_cmd(&cmd, MMC_CMD_STOP_TRANSMISSION, 0, MMC_RSP_R1b);
> + mci_send_cmd(mci, &cmd, NULL);
Do we have to send CMD12 even when a single block transfer failed?
Sascha
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