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Message-ID: <CAK00qKDy8XQm96giYwtXTKkSQUPRuJtv-GgQLk36x-xO_+AmyA@mail.gmail.com>
Date: Tue, 13 Dec 2022 16:48:12 +0800
From: Victor Shih <victorshihgli@...il.com>
To: Adrian Hunter <adrian.hunter@...el.com>
Cc: ulf.hansson@...aro.org, linux-mmc@...r.kernel.org,
linux-kernel@...r.kernel.org, benchuanggli@...il.com,
HL.Liu@...esyslogic.com.tw, Greg.tu@...esyslogic.com.tw,
takahiro.akashi@...aro.org, dlunev@...omium.org,
Victor Shih <victor.shih@...esyslogic.com.tw>,
Ben Chuang <ben.chuang@...esyslogic.com.tw>
Subject: Re: [PATCH V5 21/26] mmc: sdhci-uhs2: add add_host() and others to
set up the driver
Hi, Adrian
On Wed, Nov 2, 2022 at 1:15 AM Adrian Hunter <adrian.hunter@...el.com> 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@...esyslogic.com.tw>
> > Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
> > Signed-off-by: Victor Shih <victor.shih@...esyslogic.com.tw>
> > ---
> > 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
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