[U-Boot] [v2, 2/5] mmc: send STOP command when the READ/WRITE commands fail

[Y.B. Lu]

> -----Original Message-----
> From: Jaehoon Chung [mailto:jh80.chung at samsung.com]
> Sent: Monday, September 19, 2016 8:09 AM
> To: Y.B. Lu; u-boot at 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.lu at 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 */
> >