Re: [PATCH V5 21/26] mmc: sdhci-uhs2: add add_host() and others to set up the driver

[Victor Shih]

Hi, Adrian

On Wed, Nov 2, 2022 at 1:15 AM Adrian Hunter <adrian.hunter@xxxxxxxxx> wrote:
>
> On 19/10/22 14:06, Victor Shih wrote:
> > This is a UHS-II version of sdhci's add_host/remove_host operation.
> > Any sdhci drivers which are capable of handling UHS-II cards must
> > call those functions instead of the corresponding sdhci's.
> >
> > Signed-off-by: Ben Chuang <ben.chuang@xxxxxxxxxxxxxxxxxxx>
> > Signed-off-by: AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx>
> > Signed-off-by: Victor Shih <victor.shih@xxxxxxxxxxxxxxxxxxx>
> > ---
> >  drivers/mmc/host/sdhci-uhs2.c | 172 ++++++++++++++++++++++++++++++++++
> >  drivers/mmc/host/sdhci-uhs2.h |   2 +
> >  drivers/mmc/host/sdhci.c      |  21 +++--
> >  drivers/mmc/host/sdhci.h      |   9 ++
> >  4 files changed, 197 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
> > index 883e18d849ad..eb3241bf95a2 100644
> > --- a/drivers/mmc/host/sdhci-uhs2.c
> > +++ b/drivers/mmc/host/sdhci-uhs2.c
> > @@ -15,6 +15,7 @@
> >  #include <linux/ktime.h>
> >  #include <linux/module.h>
> >  #include <linux/mmc/mmc.h>
> > +#include <linux/regulator/consumer.h>
> >
> >  #include "sdhci.h"
> >  #include "sdhci-uhs2.h"
> > @@ -1177,6 +1178,177 @@ static irqreturn_t sdhci_uhs2_thread_irq(int irq, void *dev_id)
> >       return IRQ_HANDLED;
> >  }
> >
> > +/*****************************************************************************\
> > + *
> > + * Device allocation/registration                                            *
> > + *                                                                           *
> > +\*****************************************************************************/
> > +
> > +static int __sdhci_uhs2_add_host_v4(struct sdhci_host *host, u32 caps1)
> > +{
> > +     struct mmc_host *mmc;
> > +     u32 max_current_caps2;
> > +
> > +     if (host->version < SDHCI_SPEC_400)
> > +             return 0;
> > +
> > +     mmc = host->mmc;
> > +
> > +     /* Support UHS2 */
> > +     if (caps1 & SDHCI_SUPPORT_UHS2)
> > +             mmc->caps2 |= MMC_CAP2_SD_UHS2;
> > +
> > +     max_current_caps2 = sdhci_readl(host, SDHCI_MAX_CURRENT_1);
> > +
> > +     if ((caps1 & SDHCI_SUPPORT_VDD2_180) &&
> > +         !max_current_caps2 &&
> > +         !IS_ERR(mmc->supply.vmmc2)) {
> > +             /* UHS2 - VDD2 */
> > +             int curr = regulator_get_current_limit(mmc->supply.vmmc2);
> > +
> > +             if (curr > 0) {
> > +                     /* convert to SDHCI_MAX_CURRENT format */
> > +                     curr = curr / 1000;  /* convert to mA */
> > +                     curr = curr / SDHCI_MAX_CURRENT_MULTIPLIER;
> > +                     curr = min_t(u32, curr, SDHCI_MAX_CURRENT_LIMIT);
> > +                     max_current_caps2 = curr;
> > +             }
> > +     }
> > +
> > +     if (caps1 & SDHCI_SUPPORT_VDD2_180) {
> > +             mmc->ocr_avail_uhs2 |= MMC_VDD2_165_195;
> > +             /*
> > +              * UHS2 doesn't require this. Only UHS-I bus needs to set
> > +              * max current.
> > +              */
> > +             mmc->max_current_180_vdd2 = (max_current_caps2 &
> > +                                     SDHCI_MAX_CURRENT_VDD2_180_MASK) *
> > +                                     SDHCI_MAX_CURRENT_MULTIPLIER;
> > +     } else {
> > +             mmc->caps2 &= ~MMC_CAP2_SD_UHS2;
> > +     }
> > +
> > +     return 0;
> > +}
> > +
> > +static int sdhci_uhs2_host_ops_init(struct sdhci_host *host);
> > +
> > +static int __sdhci_uhs2_add_host(struct sdhci_host *host)
>
> The only thing this does differently is to use
> sdhci_uhs2_complete_work() and sdhci_uhs2_thread_irq().
> Better to add variables in struct sdhci_host, set them in
> sdhci_alloc_host:
>
>         host->complete_work_fn = sdhci_complete_work;
>         host->thread_irq_fn = sdhci_thread_irq;
>
> override them in sdhci_uhs2_add_host():
>
>         host->complete_work_fn = sdhci_uhs2_complete_work;
>         host->thread_irq_fn = sdhci_uhs2_thread_irq;
>
> and use them in __sdhci_add_host().
>

I will update it in the patch#20 of the new [PATCH V6].

> > +{
> > +     unsigned int flags = WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_HIGHPRI;
> > +     struct mmc_host *mmc = host->mmc;
> > +     int ret;
> > +
> > +     if ((mmc->caps2 & MMC_CAP2_CQE) &&
> > +         (host->quirks & SDHCI_QUIRK_BROKEN_CQE)) {
> > +             mmc->caps2 &= ~MMC_CAP2_CQE;
> > +             mmc->cqe_ops = NULL;
> > +     }
> > +
> > +     /* overwrite ops */
> > +     if (mmc->caps2 & MMC_CAP2_SD_UHS2)
> > +             sdhci_uhs2_host_ops_init(host);
>
> Do in sdhci_uhs2_add_host() instead of here
>

I will update it in the patch#20 of the new [PATCH V6].

> > +
> > +     host->complete_wq = alloc_workqueue("sdhci", flags, 0);
> > +     if (!host->complete_wq)
> > +             return -ENOMEM;
> > +
> > +     INIT_WORK(&host->complete_work, sdhci_uhs2_complete_work);
> > +
> > +     timer_setup(&host->timer, sdhci_timeout_timer, 0);
> > +     timer_setup(&host->data_timer, sdhci_timeout_data_timer, 0);
> > +
> > +     init_waitqueue_head(&host->buf_ready_int);
> > +
> > +     sdhci_init(host, 0);
> > +
> > +     ret = request_threaded_irq(host->irq, sdhci_irq,
> > +                                sdhci_uhs2_thread_irq,
> > +                                IRQF_SHARED, mmc_hostname(mmc), host);
> > +     if (ret) {
> > +             pr_err("%s: Failed to request IRQ %d: %d\n",
> > +                    mmc_hostname(mmc), host->irq, ret);
> > +             goto unwq;
> > +     }
> > +
> > +     ret = mmc_add_host(mmc);
> > +             if (ret)
> > +                     return 1;
> > +
> > +     pr_info("%s: SDHCI controller on %s [%s] using %s\n",
> > +             mmc_hostname(mmc), host->hw_name, dev_name(mmc_dev(mmc)),
> > +             host->use_external_dma ? "External DMA" :
> > +             (host->flags & SDHCI_USE_ADMA) ?
> > +             (host->flags & SDHCI_USE_64_BIT_DMA) ? "ADMA 64-bit" : "ADMA" :
> > +             (host->flags & SDHCI_USE_SDMA) ? "DMA" : "PIO");
> > +
> > +     sdhci_enable_card_detection(host);
> > +
> > +     return 0;
> > +
> > +unwq:
> > +     destroy_workqueue(host->complete_wq);
> > +
> > +     return ret;
> > +}
> > +
> > +static void __sdhci_uhs2_remove_host(struct sdhci_host *host, int dead)
> > +{
> > +     if (!(host->mmc) || !(host->mmc->flags & MMC_UHS2_SUPPORT))
> > +             return;
>
> Just use sdhci_uhs2_mode() i.e
>
>         if (!sdhci_uhs2_mode(host))
>                 return;
>

I will update it in the patch#20 of the new [PATCH V6].

> > +
> > +     if (!dead)
> > +             host->ops->uhs2_reset(host, SDHCI_UHS2_SW_RESET_FULL);
> > +
> > +     sdhci_writel(host, 0, SDHCI_UHS2_ERR_INT_STATUS_EN);
> > +     sdhci_writel(host, 0, SDHCI_UHS2_ERR_INT_SIG_EN);
>
> Do not write registers if it is dead.
>

I will update it in the patch#20 of the new [PATCH V6].

> > +     host->mmc->flags &= ~MMC_UHS2_INITIALIZED;
>
> Not the drivers job to change host->mmc->flags
>

I will update it in the patch#20 of the new [PATCH V6].

> > +}
> > +
> > +int sdhci_uhs2_add_host(struct sdhci_host *host)
> > +{
> > +     struct mmc_host *mmc = host->mmc;
> > +     int ret;
> > +
> > +     ret = sdhci_setup_host(host);
> > +     if (ret)
> > +             return ret;
> > +
> > +     if (host->version >= SDHCI_SPEC_400) {
> > +             ret = __sdhci_uhs2_add_host_v4(host, host->caps1);
> > +             if (ret)
> > +                     goto cleanup;
> > +     }
> > +
> > +     if ((mmc->caps2 & MMC_CAP2_SD_UHS2) && !host->v4_mode)
> > +             /* host doesn't want to enable UHS2 support */
> > +             /* FIXME: Do we have to do some cleanup here? */
> > +             mmc->caps2 &= ~MMC_CAP2_SD_UHS2;
> > +
> > +     ret = __sdhci_uhs2_add_host(host);
> > +     if (ret)
> > +             goto cleanup2;
> > +
> > +     return 0;
> > +
> > +cleanup2:
> > +     if (host->version >= SDHCI_SPEC_400)
> > +             __sdhci_uhs2_remove_host(host, 0);
> > +cleanup:
> > +     sdhci_cleanup_host(host);
> > +
> > +     return ret;
> > +}
> > +EXPORT_SYMBOL_GPL(sdhci_uhs2_add_host);
> > +
> > +void sdhci_uhs2_remove_host(struct sdhci_host *host, int dead)
> > +{
> > +     __sdhci_uhs2_remove_host(host, dead);
> > +
> > +     sdhci_remove_host(host, dead);
> > +}
> > +EXPORT_SYMBOL_GPL(sdhci_uhs2_remove_host);
> > +
> >  void sdhci_uhs2_request(struct mmc_host *mmc, struct mmc_request *mrq)
> >  {
> >       struct sdhci_host *host = mmc_priv(mmc);
> > diff --git a/drivers/mmc/host/sdhci-uhs2.h b/drivers/mmc/host/sdhci-uhs2.h
> > index d32a8602d045..54241a7adfca 100644
> > --- a/drivers/mmc/host/sdhci-uhs2.h
> > +++ b/drivers/mmc/host/sdhci-uhs2.h
> > @@ -220,5 +220,7 @@ void sdhci_uhs2_clear_set_irqs(struct sdhci_host *host, u32 clear, u32 set);
> >  void sdhci_uhs2_request(struct mmc_host *mmc, struct mmc_request *mrq);
> >  int sdhci_uhs2_request_atomic(struct mmc_host *mmc, struct mmc_request *mrq);
> >  u32 sdhci_uhs2_irq(struct sdhci_host *host, u32 intmask);
> > +int sdhci_uhs2_add_host(struct sdhci_host *host);
> > +void sdhci_uhs2_remove_host(struct sdhci_host *host, int dead);
> >
> >  #endif /* __SDHCI_UHS2_H */
> > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> > index e44ede049559..df433ad0ba66 100644
> > --- a/drivers/mmc/host/sdhci.c
> > +++ b/drivers/mmc/host/sdhci.c
> > @@ -173,10 +173,11 @@ static void sdhci_set_card_detection(struct sdhci_host *host, bool enable)
> >       sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
> >  }
> >
> > -static void sdhci_enable_card_detection(struct sdhci_host *host)
> > +void sdhci_enable_card_detection(struct sdhci_host *host)
> >  {
> >       sdhci_set_card_detection(host, true);
> >  }
> > +EXPORT_SYMBOL_GPL(sdhci_enable_card_detection);
> >
> >  static void sdhci_disable_card_detection(struct sdhci_host *host)
> >  {
> > @@ -365,7 +366,7 @@ static void sdhci_config_dma(struct sdhci_host *host)
> >       sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
> >  }
> >
> > -static void sdhci_init(struct sdhci_host *host, int soft)
> > +void sdhci_init(struct sdhci_host *host, int soft)
> >  {
> >       struct mmc_host *mmc = host->mmc;
> >       unsigned long flags;
> > @@ -390,6 +391,7 @@ static void sdhci_init(struct sdhci_host *host, int soft)
> >               mmc->ops->set_ios(mmc, &mmc->ios);
> >       }
> >  }
> > +EXPORT_SYMBOL_GPL(sdhci_init);
> >
> >  static void sdhci_reinit(struct sdhci_host *host)
> >  {
> > @@ -454,7 +456,7 @@ static void sdhci_led_control(struct led_classdev *led,
> >       spin_unlock_irqrestore(&host->lock, flags);
> >  }
> >
> > -static int sdhci_led_register(struct sdhci_host *host)
> > +int sdhci_led_register(struct sdhci_host *host)
> >  {
> >       struct mmc_host *mmc = host->mmc;
> >
> > @@ -471,14 +473,16 @@ static int sdhci_led_register(struct sdhci_host *host)
> >
> >       return led_classdev_register(mmc_dev(mmc), &host->led);
> >  }
> > +EXPORT_SYMBOL_GPL(sdhci_led_register);
> >
> > -static void sdhci_led_unregister(struct sdhci_host *host)
> > +void sdhci_led_unregister(struct sdhci_host *host)
> >  {
> >       if (host->quirks & SDHCI_QUIRK_NO_LED)
> >               return;
> >
> >       led_classdev_unregister(&host->led);
> >  }
> > +EXPORT_SYMBOL_GPL(sdhci_led_unregister);
> >
> >  static inline void sdhci_led_activate(struct sdhci_host *host)
> >  {
> > @@ -3244,7 +3248,7 @@ static void sdhci_complete_work(struct work_struct *work)
> >               ;
> >  }
> >
> > -static void sdhci_timeout_timer(struct timer_list *t)
> > +void sdhci_timeout_timer(struct timer_list *t)
> >  {
> >       struct sdhci_host *host;
> >       unsigned long flags;
> > @@ -3265,8 +3269,9 @@ static void sdhci_timeout_timer(struct timer_list *t)
> >
> >       spin_unlock_irqrestore(&host->lock, flags);
> >  }
> > +EXPORT_SYMBOL_GPL(sdhci_timeout_timer);
> >
> > -static void sdhci_timeout_data_timer(struct timer_list *t)
> > +void sdhci_timeout_data_timer(struct timer_list *t)
> >  {
> >       struct sdhci_host *host;
> >       unsigned long flags;
> > @@ -3297,6 +3302,7 @@ static void sdhci_timeout_data_timer(struct timer_list *t)
> >
> >       spin_unlock_irqrestore(&host->lock, flags);
> >  }
> > +EXPORT_SYMBOL_GPL(sdhci_timeout_data_timer);
> >
> >  /*****************************************************************************\
> >   *                                                                           *
> > @@ -3560,7 +3566,7 @@ static inline bool sdhci_defer_done(struct sdhci_host *host,
> >               data->host_cookie == COOKIE_MAPPED);
> >  }
> >
> > -static irqreturn_t sdhci_irq(int irq, void *dev_id)
> > +irqreturn_t sdhci_irq(int irq, void *dev_id)
> >  {
> >       struct mmc_request *mrqs_done[SDHCI_MAX_MRQS] = {0};
> >       irqreturn_t result = IRQ_NONE;
> > @@ -3701,6 +3707,7 @@ static irqreturn_t sdhci_irq(int irq, void *dev_id)
> >
> >       return result;
> >  }
> > +EXPORT_SYMBOL_GPL(sdhci_irq);
>
> This doesn't need to be exported when __sdhci_uhs2_add_host()
> isn't needed.
>

I will update it in the patch#20 of the new [PATCH V6].

> >
> >  static irqreturn_t sdhci_thread_irq(int irq, void *dev_id)
> >  {
> > diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> > index 49de8fdbd7a3..0970fe392d49 100644
> > --- a/drivers/mmc/host/sdhci.h
> > +++ b/drivers/mmc/host/sdhci.h
> > @@ -851,8 +851,14 @@ static inline void sdhci_read_caps(struct sdhci_host *host)
> >  }
> >
> >  bool sdhci_data_line_cmd(struct mmc_command *cmd);
> > +void sdhci_enable_card_detection(struct sdhci_host *host);
> >  void sdhci_runtime_pm_bus_on(struct sdhci_host *host);
> >  void sdhci_runtime_pm_bus_off(struct sdhci_host *host);
> > +void sdhci_init(struct sdhci_host *host, int soft);
> > +#if IS_REACHABLE(CONFIG_LEDS_CLASS)
> > +int sdhci_led_register(struct sdhci_host *host);
> > +void sdhci_led_unregister(struct sdhci_host *host);
> > +#endif
>
> Don't support LEDs.  Just set:
>
>         /* LED support not implemented for UHS2 */
>         host->quirks |= SDHCI_QUIRK_NO_LED;
>

I will update it in the patch#20 of the new [PATCH V6].

> >  void sdhci_mod_timer(struct sdhci_host *host, struct mmc_request *mrq, unsigned long timeout);
> >  void sdhci_initialize_data(struct sdhci_host *host, struct mmc_data *data);
> >  void sdhci_prepare_dma(struct sdhci_host *host, struct mmc_data *data);
> > @@ -900,6 +906,9 @@ int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
> >  void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable);
> >  void sdhci_request_done_dma(struct sdhci_host *host, struct mmc_request *mrq);
> >  bool sdhci_request_done(struct sdhci_host *host);
> > +void sdhci_timeout_timer(struct timer_list *t);
> > +void sdhci_timeout_data_timer(struct timer_list *t);
> > +irqreturn_t sdhci_irq(int irq, void *dev_id);
> >  void sdhci_adma_write_desc(struct sdhci_host *host, void **desc,
> >                          dma_addr_t addr, int len, unsigned int cmd);
> >
>

Thanks, Victor Shih