> -----Original Message-----
> From: Jaehoon Chung [mailto:jh80.ch...@samsung.com]
> Sent: Monday, September 19, 2016 8:09 AM
> To: Y.B. Lu; u-boot@lists.denx.de
> Cc: york sun
> Subject: Re: [v2, 2/5] mmc: send STOP command when the READ/WRITE
> commands fail
>
> Hi Yangbo,
>
> On 08/02/2016 06:20 PM, Yangbo Lu wrote:
> > The STOP command should be sent to stop data transfer when the
> > READ/WRITE commands fail. Otherwise, any subsequent command will fail
> > to be sent.
> >
> > Signed-off-by: Yangbo Lu <yangbo...@nxp.com>
> > ---
> > Changes for v2:
> > - None
> > ---
> > drivers/mmc/mmc.c | 28 +++++++++++++++++++---------
> > drivers/mmc/mmc_private.h | 1 +
> > drivers/mmc/mmc_write.c | 8 ++------
> > 3 files changed, 22 insertions(+), 15 deletions(-)
> >
> > diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index
> > f8e5f7a..85d1e18 100644
> > --- a/drivers/mmc/mmc.c
> > +++ b/drivers/mmc/mmc.c
> > @@ -188,6 +188,21 @@ int mmc_set_blocklen(struct mmc *mmc, int len)
> > return mmc_send_cmd(mmc, &cmd, NULL); }
> >
> > +int mmc_send_stop(struct mmc *mmc)
> > +{
> > + struct mmc_cmd cmd;
> > + int err;
> > +
> > + cmd.cmdidx = MMC_CMD_STOP_TRANSMISSION;
> > + cmd.cmdarg = 0;
> > + cmd.resp_type = MMC_RSP_R1b;
> > +
> > + err = mmc_send_cmd(mmc, &cmd, NULL);
> > + if (err)
> > + printf("mmc fail to send stop cmd\n");
> > + return err;
> > +}
> > +
> > static int mmc_read_blocks(struct mmc *mmc, void *dst, lbaint_t start,
> > lbaint_t blkcnt)
> > {
> > @@ -211,19 +226,14 @@ static int mmc_read_blocks(struct mmc *mmc, void
> *dst, lbaint_t start,
> > data.blocksize = mmc->read_bl_len;
> > data.flags = MMC_DATA_READ;
> >
> > - if (mmc_send_cmd(mmc, &cmd, &data))
> > + if (mmc_send_cmd(mmc, &cmd, &data)) {
> > + mmc_send_stop(mmc);
>
> If mmc_send_stop() is also failed, is it doesn't need to return error
> number?
>
[Lu Yangbo-B47093] You're right. I need to check the return. Thanks :)
> > return 0;
> > + }
> >
> > if (blkcnt > 1) {
> > - cmd.cmdidx = MMC_CMD_STOP_TRANSMISSION;
> > - cmd.cmdarg = 0;
> > - cmd.resp_type = MMC_RSP_R1b;
> > - if (mmc_send_cmd(mmc, &cmd, NULL)) {
> > -#if !defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_LIBCOMMON_SUPPORT)
> > - printf("mmc fail to send stop cmd\n");
> > -#endif
> > + if (mmc_send_stop(mmc))
> > return 0;
> > - }
> > }
> >
> > return blkcnt;
> > diff --git a/drivers/mmc/mmc_private.h b/drivers/mmc/mmc_private.h
> > index 49ec022..2791125 100644
> > --- a/drivers/mmc/mmc_private.h
> > +++ b/drivers/mmc/mmc_private.h
> > @@ -16,6 +16,7 @@ extern int mmc_send_cmd(struct mmc *mmc, struct
> mmc_cmd *cmd,
> > struct mmc_data *data);
> > extern int mmc_send_status(struct mmc *mmc, int timeout); extern int
> > mmc_set_blocklen(struct mmc *mmc, int len);
> > +int mmc_send_stop(struct mmc *mmc);
> > #ifdef CONFIG_FSL_ESDHC_ADAPTER_IDENT void
> > mmc_adapter_card_type_ident(void);
> > #endif
> > diff --git a/drivers/mmc/mmc_write.c b/drivers/mmc/mmc_write.c index
> > 0f8b5c7..fb8488c 100644
> > --- a/drivers/mmc/mmc_write.c
> > +++ b/drivers/mmc/mmc_write.c
> > @@ -150,6 +150,7 @@ static ulong mmc_write_blocks(struct mmc *mmc,
> > lbaint_t start,
> >
> > if (mmc_send_cmd(mmc, &cmd, &data)) {
> > printf("mmc write failed\n");
> > + mmc_send_stop(mmc);
>
> ditto.
[Lu Yangbo-B47093] Ok, I will check the return. Thanks :)
>
> Best Regards,
> Jaehoon Chung
>
> > return 0;
> > }
> >
> > @@ -157,13 +158,8 @@ static ulong mmc_write_blocks(struct mmc *mmc,
> lbaint_t start,
> > * token, not a STOP_TRANSMISSION request.
> > */
> > if (!mmc_host_is_spi(mmc) && blkcnt > 1) {
> > - cmd.cmdidx = MMC_CMD_STOP_TRANSMISSION;
> > - cmd.cmdarg = 0;
> > - cmd.resp_type = MMC_RSP_R1b;
> > - if (mmc_send_cmd(mmc, &cmd, NULL)) {
> > - printf("mmc fail to send stop cmd\n");
> > + if (mmc_send_stop(mmc))
> > return 0;
> > - }
> > }
> >
> > /* Waiting for the ready status */
> >
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