> -----Original Message-----
> From: Avri Altman <Avri.Altman@xxxxxxx>
> Sent: Tuesday, February 13, 2024 5:42 PM
> To: Seunghui Lee <sh043.lee@xxxxxxxxxxx>; linux-mmc@xxxxxxxxxxxxxxx;
> linux-kernel@xxxxxxxxxxxxxxx; ulf.hansson@xxxxxxxxxx;
> gregkh@xxxxxxxxxxxxxxxxxxx
> Cc: grant.jung@xxxxxxxxxxx; jt77.jang@xxxxxxxxxxx;
> dh0421.hwang@xxxxxxxxxxx; junwoo80.lee@xxxxxxxxxxx; jangsub.yi@xxxxxxxxxxx;
> cw9316.lee@xxxxxxxxxxx; sh8267.baek@xxxxxxxxxxx; wkon.kim@xxxxxxxxxxx
> Subject: RE: [PATCH] mmc: sd: Add a variable to check a faulty device
>
> > In mobile devices, suspend/resume situations are frequent.
> > In the case of a defective SD card in which initialization fails,
> > unnecessary initialization time is consumed for each resume.
> > A field is needed to check that SD card initialization has failed on
> > the host. It could be used to remove unnecessary initialization.
> I don't see where you are using this new init_failed field?
> Maybe instead, elaborate the logic to free_card: to detect a broken sd.
> e.g. instead of just if (!oldcard), if (!oldcard || ! mmc_sd_alive(host))
> or something.
>
> Thanks,
> Avri
>
Thank you for your suggestion.
I'm going to use it in mmc_rescan as below.
e.g.
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index a8c17b4cd737..461cd75dc7ab 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -2210,7 +2210,7 @@ void mmc_rescan(struct work_struct *work)
container_of(work, struct mmc_host, detect.work);
int i;
- if (host->rescan_disable)
+ if (host->rescan_disable || host->init_failed)
return;
> >
> > Signed-off-by: Seunghui Lee <sh043.lee@xxxxxxxxxxx>
> > ---
> > drivers/mmc/core/sd.c | 12 +++++++++++-
> > drivers/mmc/core/slot-gpio.c | 1 +
> > include/linux/mmc/host.h | 1 +
> > 3 files changed, 13 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c index
> > c3e554344c99..f0eb3864dc24 100644
> > --- a/drivers/mmc/core/sd.c
> > +++ b/drivers/mmc/core/sd.c
> > @@ -1410,6 +1410,7 @@ static int mmc_sd_init_card(struct mmc_host
> > *host,
> > u32 ocr,
> > bool v18_fixup_failed = false;
> >
> > WARN_ON(!host->claimed);
> > + host->init_failed = false;
> > retry:
> > err = mmc_sd_get_cid(host, ocr, cid, &rocr);
> > if (err)
> > @@ -1752,6 +1753,8 @@ static int _mmc_sd_resume(struct mmc_host *host)
> >
> > mmc_power_up(host, host->card->ocr);
> > err = mmc_sd_init_card(host, host->card->ocr, host->card);
> > + if (err)
> > + host->init_failed = true;
> > mmc_card_clr_suspended(host->card);
> >
> > out:
> > @@ -1803,8 +1806,12 @@ static int mmc_sd_runtime_resume(struct
> > mmc_host *host)
> >
> > static int mmc_sd_hw_reset(struct mmc_host *host) {
> > + int err;
> > mmc_power_cycle(host, host->card->ocr);
> > - return mmc_sd_init_card(host, host->card->ocr, host->card);
> > + err = mmc_sd_init_card(host, host->card->ocr, host->card);
> > + if (err)
> > + host->init_failed = true;
> > + return err;
> > }
> >
> > static const struct mmc_bus_ops mmc_sd_ops = { @@ -1891,5 +1898,8 @@
> > int mmc_attach_sd(struct mmc_host *host)
> > pr_err("%s: error %d whilst initialising SD card\n",
> > mmc_hostname(host), err);
> >
> > + if (err)
> > + host->init_failed = true;
> > +
> > return err;
> > }
> > diff --git a/drivers/mmc/core/slot-gpio.c
> > b/drivers/mmc/core/slot-gpio.c index
> > 2a2d949a9344..93d081c7dd53 100644
> > --- a/drivers/mmc/core/slot-gpio.c
> > +++ b/drivers/mmc/core/slot-gpio.c
> > @@ -33,6 +33,7 @@ static irqreturn_t mmc_gpio_cd_irqt(int irq, void
> *dev_id)
> > struct mmc_gpio *ctx = host->slot.handler_priv;
> >
> > host->trigger_card_event = true;
> > + host->init_failed = false;
> > mmc_detect_change(host,
> > msecs_to_jiffies(ctx->cd_debounce_delay_ms));
> >
> > return IRQ_HANDLED;
> > diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h index
> > 2f445c651742..1d75cfdbf981 100644
> > --- a/include/linux/mmc/host.h
> > +++ b/include/linux/mmc/host.h
> > @@ -467,6 +467,7 @@ struct mmc_host {
> > struct timer_list retune_timer; /* for periodic re-tuning */
> >
> > bool trigger_card_event; /* card_event necessary */
> > + bool init_failed; /* check if failed to
> initialize */
> >
> > struct mmc_card *card; /* device attached to this host
> */
> >
> > --
> > 2.29.0
