Re: [RFC PATCH v3.1 16/27] mmc: sdhci-uhs2: add set_ios()

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On Thu, Nov 26, 2020 at 10:17:11AM +0200, Adrian Hunter wrote:
> On 6/11/20 4:27 am, AKASHI Takahiro wrote:
> > This is a sdhci version of mmc's set_ios operation.
> > It covers both UHS-I and UHS-II.
> > 
> > Signed-off-by: Ben Chuang <ben.chuang@xxxxxxxxxxxxxxxxxxx>
> > Signed-off-by: AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx>
> > ---
> >  drivers/mmc/host/sdhci-uhs2.c | 100 ++++++++++++++++++++++++++++++++++
> >  drivers/mmc/host/sdhci-uhs2.h |   1 +
> >  drivers/mmc/host/sdhci.c      |  40 +++++++++-----
> >  drivers/mmc/host/sdhci.h      |   2 +
> >  4 files changed, 128 insertions(+), 15 deletions(-)
> > 
> > diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
> > index d9e98c097bfe..637464748cc4 100644
> > --- a/drivers/mmc/host/sdhci-uhs2.c
> > +++ b/drivers/mmc/host/sdhci-uhs2.c
> > @@ -263,6 +263,74 @@ void sdhci_uhs2_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
> >  }
> >  EXPORT_SYMBOL_GPL(sdhci_uhs2_set_timeout);
> >  
> > +/**
> > + * sdhci_uhs2_clear_set_irqs - set Error Interrupt Status Enable register
> > + * @host:	SDHCI host
> > + * @clear:	bit-wise clear mask
> > + * @set:	bit-wise set mask
> > + *
> > + * Set/unset bits in UHS-II Error Interrupt Status Enable register
> > + */
> > +void sdhci_uhs2_clear_set_irqs(struct sdhci_host *host, u32 clear, u32 set)
> > +{
> > +	u32 ier;
> > +
> > +	ier = sdhci_readl(host, SDHCI_UHS2_ERR_INT_STATUS_EN);
> > +	ier &= ~clear;
> > +	ier |= set;
> > +	sdhci_writel(host, ier, SDHCI_UHS2_ERR_INT_STATUS_EN);
> > +	sdhci_writel(host, ier, SDHCI_UHS2_ERR_INT_SIG_EN);
> > +}
> > +EXPORT_SYMBOL_GPL(sdhci_uhs2_clear_set_irqs);
> > +
> > +static void __sdhci_uhs2_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> > +{
> > +	struct sdhci_host *host = mmc_priv(mmc);
> > +	u8 cmd_res, dead_lock;
> > +	u16 ctrl_2;
> > +	unsigned long flags;
> > +
> > +	/* FIXME: why lock? */
> > +	spin_lock_irqsave(&host->lock, flags);
> > +
> > +	/* UHS2 Timeout Control */
> > +	sdhci_calc_timeout_uhs2(host, &cmd_res, &dead_lock);
> > +
> > +	/* change to use calculate value */
> > +	cmd_res |= dead_lock << SDHCI_UHS2_TIMER_CTRL_DEADLOCK_SHIFT;
> > +
> > +	sdhci_uhs2_clear_set_irqs(host,
> > +				  SDHCI_UHS2_ERR_INT_STATUS_RES_TIMEOUT |
> > +				  SDHCI_UHS2_ERR_INT_STATUS_DEADLOCK_TIMEOUT,
> > +				  0);
> > +	sdhci_writeb(host, cmd_res, SDHCI_UHS2_TIMER_CTRL);
> > +	sdhci_uhs2_clear_set_irqs(host, 0,
> > +				  SDHCI_UHS2_ERR_INT_STATUS_RES_TIMEOUT |
> > +				  SDHCI_UHS2_ERR_INT_STATUS_DEADLOCK_TIMEOUT);
> > +
> > +	/* UHS2 timing */
> > +	ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
> > +	if (ios->timing == MMC_TIMING_UHS2)
> > +		ctrl_2 |= SDHCI_CTRL_UHS_2 | SDHCI_CTRL_UHS2_INTERFACE_EN;
> > +	else
> > +		ctrl_2 &= ~(SDHCI_CTRL_UHS_2 | SDHCI_CTRL_UHS2_INTERFACE_EN);
> > +	sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
> > +
> > +	if (!(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN))
> > +		sdhci_enable_preset_value(host, true);
> > +
> > +	if (host->ops->set_power)
> > +		host->ops->set_power(host, ios->power_mode, ios->vdd);
> > +	else
> > +		sdhci_set_power(host, ios->power_mode, ios->vdd);
> > +	udelay(100);
> > +
> > +	host->timing = ios->timing;
> > +	sdhci_set_clock(host, host->clock);
> 
> sdhci_set_ios_common() already called ->set_clock() and ->set_power(), so I
> am not really following what is going on here.  Can you explain some more?

To be frank, I don't know. The logic in Intel's (and/or Ben's?)
original code does so.
What I changed is to remove the code of setting (ios->vdd and) ios->vdd2,
which is executed before calling set_power(), in __sdhci_uhs2_set_ios().

So yes, effectively it may be of no use to call set_power() here.

-Takahiro Akashi

> > +
> > +	spin_unlock_irqrestore(&host->lock, flags);
> > +}
> > +
> >  /*****************************************************************************\
> >   *                                                                           *
> >   * MMC callbacks                                                             *
> > @@ -286,6 +354,37 @@ static int sdhci_uhs2_start_signal_voltage_switch(struct mmc_host *mmc,
> >  	return sdhci_start_signal_voltage_switch(mmc, ios);
> >  }
> >  
> > +void sdhci_uhs2_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> > +{
> > +	struct sdhci_host *host = mmc_priv(mmc);
> > +
> > +	if (!(host->version >= SDHCI_SPEC_400) ||
> > +	    !(host->mmc->flags & MMC_UHS2_SUPPORT &&
> > +	      host->mmc->caps & MMC_CAP_UHS2)) {
> > +		sdhci_set_ios(mmc, ios);
> > +		return;
> > +	}
> > +
> > +	if (ios->power_mode == MMC_POWER_UNDEFINED)
> > +		return;
> > +
> > +	if (host->flags & SDHCI_DEVICE_DEAD) {
> > +		if (!IS_ERR(mmc->supply.vmmc) &&
> > +		    ios->power_mode == MMC_POWER_OFF)
> > +			mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
> > +		if (!IS_ERR_OR_NULL(mmc->supply.vmmc2) &&
> > +		    ios->power_mode == MMC_POWER_OFF)
> > +			mmc_regulator_set_ocr(mmc, mmc->supply.vmmc2, 0);
> > +		return;
> > +	}
> > +
> > +	/* FIXME: host->timing = ios->timing */
> > +
> > +	sdhci_set_ios_common(mmc, ios);
> > +
> > +	__sdhci_uhs2_set_ios(mmc, ios);
> > +}
> > +
> >  /*****************************************************************************\
> >   *                                                                           *
> >   * Driver init/exit                                                          *
> > @@ -296,6 +395,7 @@ static int sdhci_uhs2_host_ops_init(struct sdhci_host *host)
> >  {
> >  	host->mmc_host_ops.start_signal_voltage_switch =
> >  		sdhci_uhs2_start_signal_voltage_switch;
> > +	host->mmc_host_ops.set_ios = sdhci_uhs2_set_ios;
> >  
> >  	return 0;
> >  }
> > diff --git a/drivers/mmc/host/sdhci-uhs2.h b/drivers/mmc/host/sdhci-uhs2.h
> > index efe70577bc74..c1ff4ac1ab7a 100644
> > --- a/drivers/mmc/host/sdhci-uhs2.h
> > +++ b/drivers/mmc/host/sdhci-uhs2.h
> > @@ -214,5 +214,6 @@ void sdhci_uhs2_reset(struct sdhci_host *host, u16 mask);
> >  void sdhci_uhs2_set_power(struct sdhci_host *host, unsigned char mode,
> >  			  unsigned short vdd);
> >  void sdhci_uhs2_set_timeout(struct sdhci_host *host, struct mmc_command *cmd);
> > +void sdhci_uhs2_clear_set_irqs(struct sdhci_host *host, u32 clear, u32 set);
> >  
> >  #endif /* __SDHCI_UHS2_H */
> > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> > index 0b741eb546cb..becb228330af 100644
> > --- a/drivers/mmc/host/sdhci.c
> > +++ b/drivers/mmc/host/sdhci.c
> > @@ -48,8 +48,6 @@
> >  static unsigned int debug_quirks = 0;
> >  static unsigned int debug_quirks2;
> >  
> > -static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable);
> > -
> >  static bool sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd);
> >  
> >  void sdhci_dumpregs(struct sdhci_host *host)
> > @@ -1836,6 +1834,9 @@ static u16 sdhci_get_preset_value(struct sdhci_host *host)
> >  	case MMC_TIMING_MMC_HS400:
> >  		preset = sdhci_readw(host, SDHCI_PRESET_FOR_HS400);
> >  		break;
> > +	case MMC_TIMING_UHS2:
> > +		preset = sdhci_readw(host, SDHCI_PRESET_FOR_UHS2);
> > +		break;
> >  	default:
> >  		pr_warn("%s: Invalid UHS-I mode selected\n",
> >  			mmc_hostname(host->mmc));
> > @@ -2249,20 +2250,9 @@ void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing)
> >  }
> >  EXPORT_SYMBOL_GPL(sdhci_set_uhs_signaling);
> >  
> > -void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> > +void sdhci_set_ios_common(struct mmc_host *mmc, struct mmc_ios *ios)
> >  {
> >  	struct sdhci_host *host = mmc_priv(mmc);
> > -	u8 ctrl;
> > -
> > -	if (ios->power_mode == MMC_POWER_UNDEFINED)
> > -		return;
> > -
> > -	if (host->flags & SDHCI_DEVICE_DEAD) {
> > -		if (!IS_ERR(mmc->supply.vmmc) &&
> > -		    ios->power_mode == MMC_POWER_OFF)
> > -			mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
> > -		return;
> > -	}
> >  
> >  	/*
> >  	 * Reset the chip on each power off.
> > @@ -2299,6 +2289,25 @@ void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> >  		host->ops->set_power(host, ios->power_mode, ios->vdd);
> >  	else
> >  		sdhci_set_power(host, ios->power_mode, ios->vdd);
> > +}
> > +EXPORT_SYMBOL_GPL(sdhci_set_ios_common);
> > +
> > +void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> > +{
> > +	struct sdhci_host *host = mmc_priv(mmc);
> > +	u8 ctrl;
> > +
> > +	if (ios->power_mode == MMC_POWER_UNDEFINED)
> > +		return;
> > +
> > +	if (host->flags & SDHCI_DEVICE_DEAD) {
> > +		if (!IS_ERR(mmc->supply.vmmc) &&
> > +		    ios->power_mode == MMC_POWER_OFF)
> > +			mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
> > +		return;
> > +	}
> > +
> > +	sdhci_set_ios_common(mmc, ios);
> >  
> >  	if (host->ops->platform_send_init_74_clocks)
> >  		host->ops->platform_send_init_74_clocks(host, ios->power_mode);
> > @@ -2869,7 +2878,7 @@ int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
> >  }
> >  EXPORT_SYMBOL_GPL(sdhci_execute_tuning);
> >  
> > -static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable)
> > +void sdhci_enable_preset_value(struct sdhci_host *host, bool enable)
> >  {
> >  	/* Host Controller v3.00 defines preset value registers */
> >  	if (host->version < SDHCI_SPEC_300)
> > @@ -2897,6 +2906,7 @@ static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable)
> >  		host->preset_enabled = enable;
> >  	}
> >  }
> > +EXPORT_SYMBOL_GPL(sdhci_enable_preset_value);
> >  
> >  static void sdhci_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
> >  				int err)
> > diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> > index 2b5b8295cf92..e84ebddb20d8 100644
> > --- a/drivers/mmc/host/sdhci.h
> > +++ b/drivers/mmc/host/sdhci.h
> > @@ -851,6 +851,8 @@ void sdhci_set_bus_width(struct sdhci_host *host, int width);
> >  void sdhci_reset(struct sdhci_host *host, u8 mask);
> >  void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing);
> >  int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode);
> > +void sdhci_enable_preset_value(struct sdhci_host *host, bool enable);
> > +void sdhci_set_ios_common(struct mmc_host *mmc, struct mmc_ios *ios);
> >  void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios);
> >  int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
> >  				      struct mmc_ios *ios);
> > 
> 



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