-trimmed cc list On 3 January 2017 at 09:49, Yong Mao <yong.mao@xxxxxxxxxxxx> wrote: > From: yong mao <yong.mao@xxxxxxxxxxxx> > > When initializing EMMC, after switch to HS400, > it will issue CMD6 to change ext_csd, > if first CMD6 got CRC error, > the repeat CMD6 may get timeout, > that's because card is not back to transfer state immediately. > > For resolving this issue, it need check if card is busy > before sending repeat CMD6. > > Not only CMD6 here has this issue, but also other R1B CMD has > the same issue. Is this change still something you want to discuss? Or the issue is resolved by: https://www.mail-archive.com/linux-kernel@xxxxxxxxxxxxxxx/msg1308640.html Kind regards Uffe > > Signed-off-by: Yong Mao <yong.mao@xxxxxxxxxxxx> > Signed-off-by: Chaotian Jing <chaotian.jing@xxxxxxxxxxxx> > --- > drivers/mmc/core/core.c | 19 +++++++++++++++++++ > 1 file changed, 19 insertions(+) > > diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c > index 1076b9d..8674dbb 100644 > --- a/drivers/mmc/core/core.c > +++ b/drivers/mmc/core/core.c > @@ -566,6 +566,25 @@ void mmc_wait_for_req_done(struct mmc_host *host, struct mmc_request *mrq) > > mmc_retune_recheck(host); > > + /* > + * If a R1B CMD such as CMD6 occur CRC error, > + * it will retry 3 times here. > + * But before retrying, it must ensure card is in > + * transfer state. > + * Otherwise, the next retried CMD will got TMO error. > + */ > + if (mmc_resp_type(cmd) == MMC_RSP_R1B && host->ops->card_busy) { > + int tries = 500; /* Wait aprox 500ms at maximum */ > + > + while (host->ops->card_busy(host) && --tries) > + mmc_delay(1); > + > + if (tries == 0) { > + cmd->error = -EBUSY; > + break; > + } > + } > + > pr_debug("%s: req failed (CMD%u): %d, retrying...\n", > mmc_hostname(host), cmd->opcode, cmd->error); > cmd->retries--; > -- > 1.7.9.5 > -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
