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Groups > linux.kernel > #1370689 > unrolled thread

[PATCH v2 1/3] mmc: sdhci: introduce sdhci_compute_clock_config

Started byLudovic Desroches <ludovic.desroches@atmel.com>
First post2016-04-04 17:30 +0200
Last post2016-04-07 10:00 +0200
Articles 5 — 2 participants

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  [PATCH v2 1/3] mmc: sdhci: introduce sdhci_compute_clock_config Ludovic Desroches <ludovic.desroches@atmel.com> - 2016-04-04 17:30 +0200
    Re: [PATCH v2 1/3] mmc: sdhci: introduce sdhci_compute_clock_config Adrian Hunter <adrian.hunter@intel.com> - 2016-04-06 14:50 +0200
      Re: [PATCH v2 1/3] mmc: sdhci: introduce sdhci_compute_clock_config Ludovic Desroches <ludovic.desroches@atmel.com> - 2016-04-06 17:10 +0200
        Re: [PATCH v2 1/3] mmc: sdhci: introduce sdhci_compute_clock_config Ludovic Desroches <ludovic.desroches@atmel.com> - 2016-04-06 17:20 +0200
        Re: [PATCH v2 1/3] mmc: sdhci: introduce sdhci_compute_clock_config Adrian Hunter <adrian.hunter@intel.com> - 2016-04-07 10:00 +0200

#1370689 — [PATCH v2 1/3] mmc: sdhci: introduce sdhci_compute_clock_config

FromLudovic Desroches <ludovic.desroches@atmel.com>
Date2016-04-04 17:30 +0200
Subject[PATCH v2 1/3] mmc: sdhci: introduce sdhci_compute_clock_config
Message-ID<rkeBX-52d-7@gated-at.bofh.it>
In order to remove the SDHCI_QUIRK2_NEED_DELAY_AFTER_INT_CLK_RST and to
reduce code duplication, put the code relative to the SD clock
configuration in a function which can be used by hosts for the
implementation of the set_clock() callback.

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
---
 drivers/mmc/host/sdhci.c | 33 ++++++++++++++++++++++-----------
 drivers/mmc/host/sdhci.h |  1 +
 2 files changed, 23 insertions(+), 11 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 6bd3d17..2c3dede 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1091,23 +1091,13 @@ static u16 sdhci_get_preset_value(struct sdhci_host *host)
 	return preset;
 }
 
-void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
+u16 sdhci_compute_clock_config(struct sdhci_host *host, unsigned int clock)
 {
 	int div = 0; /* Initialized for compiler warning */
 	int real_div = div, clk_mul = 1;
 	u16 clk = 0;
-	unsigned long timeout;
 	bool switch_base_clk = false;
 
-	host->mmc->actual_clock = 0;
-
-	sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
-	if (host->quirks2 & SDHCI_QUIRK2_NEED_DELAY_AFTER_INT_CLK_RST)
-		mdelay(1);
-
-	if (clock == 0)
-		return;
-
 	if (host->version >= SDHCI_SPEC_300) {
 		if (host->preset_enabled) {
 			u16 pre_val;
@@ -1188,6 +1178,27 @@ clock_set:
 	clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
 	clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
 		<< SDHCI_DIVIDER_HI_SHIFT;
+
+	return clk;
+}
+EXPORT_SYMBOL_GPL(sdhci_compute_clock_config);
+
+void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
+{
+	u16 clk;
+	unsigned long timeout;
+
+	host->mmc->actual_clock = 0;
+
+	sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
+	if (host->quirks2 & SDHCI_QUIRK2_NEED_DELAY_AFTER_INT_CLK_RST)
+		mdelay(1);
+
+	if (clock == 0)
+		return;
+
+	clk = sdhci_compute_clock_config(host, clock);
+
 	clk |= SDHCI_CLOCK_INT_EN;
 	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
 
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 0f39f4f..23ddd6e 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -661,6 +661,7 @@ static inline bool sdhci_sdio_irq_enabled(struct sdhci_host *host)
 	return !!(host->flags & SDHCI_SDIO_IRQ_ENABLED);
 }
 
+u16 sdhci_compute_clock_config(struct sdhci_host *host, unsigned int clock);
 void sdhci_set_clock(struct sdhci_host *host, unsigned int clock);
 void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
 		     unsigned short vdd);
-- 
2.5.0

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#1372496

FromAdrian Hunter <adrian.hunter@intel.com>
Date2016-04-06 14:50 +0200
Message-ID<rkV4d-3Qg-5@gated-at.bofh.it>
In reply to#1370689
On 04/04/16 18:27, Ludovic Desroches wrote:
> In order to remove the SDHCI_QUIRK2_NEED_DELAY_AFTER_INT_CLK_RST and to
> reduce code duplication, put the code relative to the SD clock
> configuration in a function which can be used by hosts for the
> implementation of the set_clock() callback.
> 
> Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
> ---
>  drivers/mmc/host/sdhci.c | 33 ++++++++++++++++++++++-----------
>  drivers/mmc/host/sdhci.h |  1 +
>  2 files changed, 23 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 6bd3d17..2c3dede 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -1091,23 +1091,13 @@ static u16 sdhci_get_preset_value(struct sdhci_host *host)
>  	return preset;
>  }
>  
> -void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
> +u16 sdhci_compute_clock_config(struct sdhci_host *host, unsigned int clock)

The function name 'sdhci_compute_clock_config' seems a bit long.  How about
just sdhci_calc_clk.

Also it needs to calculate 'actual_clock' too, so it needs to do that and
return the value.

>  {
>  	int div = 0; /* Initialized for compiler warning */
>  	int real_div = div, clk_mul = 1;
>  	u16 clk = 0;
> -	unsigned long timeout;
>  	bool switch_base_clk = false;
>  
> -	host->mmc->actual_clock = 0;
> -
> -	sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
> -	if (host->quirks2 & SDHCI_QUIRK2_NEED_DELAY_AFTER_INT_CLK_RST)
> -		mdelay(1);
> -
> -	if (clock == 0)
> -		return;
> -
>  	if (host->version >= SDHCI_SPEC_300) {
>  		if (host->preset_enabled) {
>  			u16 pre_val;
> @@ -1188,6 +1178,27 @@ clock_set:
>  	clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
>  	clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
>  		<< SDHCI_DIVIDER_HI_SHIFT;
> +
> +	return clk;
> +}
> +EXPORT_SYMBOL_GPL(sdhci_compute_clock_config);
> +
> +void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
> +{
> +	u16 clk;
> +	unsigned long timeout;
> +
> +	host->mmc->actual_clock = 0;
> +
> +	sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
> +	if (host->quirks2 & SDHCI_QUIRK2_NEED_DELAY_AFTER_INT_CLK_RST)
> +		mdelay(1);
> +
> +	if (clock == 0)
> +		return;
> +
> +	clk = sdhci_compute_clock_config(host, clock);
> +
>  	clk |= SDHCI_CLOCK_INT_EN;
>  	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
>  
> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index 0f39f4f..23ddd6e 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -661,6 +661,7 @@ static inline bool sdhci_sdio_irq_enabled(struct sdhci_host *host)
>  	return !!(host->flags & SDHCI_SDIO_IRQ_ENABLED);
>  }
>  
> +u16 sdhci_compute_clock_config(struct sdhci_host *host, unsigned int clock);
>  void sdhci_set_clock(struct sdhci_host *host, unsigned int clock);
>  void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
>  		     unsigned short vdd);
>

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#1372591

FromLudovic Desroches <ludovic.desroches@atmel.com>
Date2016-04-06 17:10 +0200
Message-ID<rkXfI-5Ne-19@gated-at.bofh.it>
In reply to#1372496
On Wed, Apr 06, 2016 at 03:37:28PM +0300, Adrian Hunter wrote:
> On 04/04/16 18:27, Ludovic Desroches wrote:
> > In order to remove the SDHCI_QUIRK2_NEED_DELAY_AFTER_INT_CLK_RST and to
> > reduce code duplication, put the code relative to the SD clock
> > configuration in a function which can be used by hosts for the
> > implementation of the set_clock() callback.
> > 
> > Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
> > ---
> >  drivers/mmc/host/sdhci.c | 33 ++++++++++++++++++++++-----------
> >  drivers/mmc/host/sdhci.h |  1 +
> >  2 files changed, 23 insertions(+), 11 deletions(-)
> > 
> > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> > index 6bd3d17..2c3dede 100644
> > --- a/drivers/mmc/host/sdhci.c
> > +++ b/drivers/mmc/host/sdhci.c
> > @@ -1091,23 +1091,13 @@ static u16 sdhci_get_preset_value(struct sdhci_host *host)
> >  	return preset;
> >  }
> >  
> > -void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
> > +u16 sdhci_compute_clock_config(struct sdhci_host *host, unsigned int clock)
> 
> The function name 'sdhci_compute_clock_config' seems a bit long.  How about
> just sdhci_calc_clk.

Ok.

> 
> Also it needs to calculate 'actual_clock' too, so it needs to do that and
> return the value.
> 

actual_clock is updated at the end of the function.

Which value has to be returned? actual_clock or clock configuration?

Regards

Ludovic

> >  {
> >  	int div = 0; /* Initialized for compiler warning */
> >  	int real_div = div, clk_mul = 1;
> >  	u16 clk = 0;
> > -	unsigned long timeout;
> >  	bool switch_base_clk = false;
> >  
> > -	host->mmc->actual_clock = 0;
> > -
> > -	sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
> > -	if (host->quirks2 & SDHCI_QUIRK2_NEED_DELAY_AFTER_INT_CLK_RST)
> > -		mdelay(1);
> > -
> > -	if (clock == 0)
> > -		return;
> > -
> >  	if (host->version >= SDHCI_SPEC_300) {
> >  		if (host->preset_enabled) {
> >  			u16 pre_val;
> > @@ -1188,6 +1178,27 @@ clock_set:
> >  	clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
> >  	clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
> >  		<< SDHCI_DIVIDER_HI_SHIFT;
> > +
> > +	return clk;
> > +}
> > +EXPORT_SYMBOL_GPL(sdhci_compute_clock_config);
> > +
> > +void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
> > +{
> > +	u16 clk;
> > +	unsigned long timeout;
> > +
> > +	host->mmc->actual_clock = 0;
> > +
> > +	sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
> > +	if (host->quirks2 & SDHCI_QUIRK2_NEED_DELAY_AFTER_INT_CLK_RST)
> > +		mdelay(1);
> > +
> > +	if (clock == 0)
> > +		return;
> > +
> > +	clk = sdhci_compute_clock_config(host, clock);
> > +
> >  	clk |= SDHCI_CLOCK_INT_EN;
> >  	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
> >  
> > diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> > index 0f39f4f..23ddd6e 100644
> > --- a/drivers/mmc/host/sdhci.h
> > +++ b/drivers/mmc/host/sdhci.h
> > @@ -661,6 +661,7 @@ static inline bool sdhci_sdio_irq_enabled(struct sdhci_host *host)
> >  	return !!(host->flags & SDHCI_SDIO_IRQ_ENABLED);
> >  }
> >  
> > +u16 sdhci_compute_clock_config(struct sdhci_host *host, unsigned int clock);
> >  void sdhci_set_clock(struct sdhci_host *host, unsigned int clock);
> >  void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
> >  		     unsigned short vdd);
> > 
>

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#1372597

FromLudovic Desroches <ludovic.desroches@atmel.com>
Date2016-04-06 17:20 +0200
Message-ID<rkXpn-5RF-19@gated-at.bofh.it>
In reply to#1372591
On Wed, Apr 06, 2016 at 05:04:45PM +0200, Ludovic Desroches wrote:
> On Wed, Apr 06, 2016 at 03:37:28PM +0300, Adrian Hunter wrote:
> > On 04/04/16 18:27, Ludovic Desroches wrote:
> > > In order to remove the SDHCI_QUIRK2_NEED_DELAY_AFTER_INT_CLK_RST and to
> > > reduce code duplication, put the code relative to the SD clock
> > > configuration in a function which can be used by hosts for the
> > > implementation of the set_clock() callback.
> > > 
> > > Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
> > > ---
> > >  drivers/mmc/host/sdhci.c | 33 ++++++++++++++++++++++-----------
> > >  drivers/mmc/host/sdhci.h |  1 +
> > >  2 files changed, 23 insertions(+), 11 deletions(-)
> > > 
> > > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> > > index 6bd3d17..2c3dede 100644
> > > --- a/drivers/mmc/host/sdhci.c
> > > +++ b/drivers/mmc/host/sdhci.c
> > > @@ -1091,23 +1091,13 @@ static u16 sdhci_get_preset_value(struct sdhci_host *host)
> > >  	return preset;
> > >  }
> > >  
> > > -void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
> > > +u16 sdhci_compute_clock_config(struct sdhci_host *host, unsigned int clock)
> > 
> > The function name 'sdhci_compute_clock_config' seems a bit long.  How about
> > just sdhci_calc_clk.
> 
> Ok.
> 
> > 
> > Also it needs to calculate 'actual_clock' too, so it needs to do that and
> > return the value.
> > 
> 
> actual_clock is updated at the end of the function.

Maybe it makes more sens to keep it in sdhci_set_clock().

> 
> Which value has to be returned? actual_clock or clock configuration?
> 
> Regards
> 
> Ludovic
> 
> > >  {
> > >  	int div = 0; /* Initialized for compiler warning */
> > >  	int real_div = div, clk_mul = 1;
> > >  	u16 clk = 0;
> > > -	unsigned long timeout;
> > >  	bool switch_base_clk = false;
> > >  
> > > -	host->mmc->actual_clock = 0;
> > > -
> > > -	sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
> > > -	if (host->quirks2 & SDHCI_QUIRK2_NEED_DELAY_AFTER_INT_CLK_RST)
> > > -		mdelay(1);
> > > -
> > > -	if (clock == 0)
> > > -		return;
> > > -
> > >  	if (host->version >= SDHCI_SPEC_300) {
> > >  		if (host->preset_enabled) {
> > >  			u16 pre_val;
> > > @@ -1188,6 +1178,27 @@ clock_set:
> > >  	clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
> > >  	clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
> > >  		<< SDHCI_DIVIDER_HI_SHIFT;
> > > +
> > > +	return clk;
> > > +}
> > > +EXPORT_SYMBOL_GPL(sdhci_compute_clock_config);
> > > +
> > > +void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
> > > +{
> > > +	u16 clk;
> > > +	unsigned long timeout;
> > > +
> > > +	host->mmc->actual_clock = 0;
> > > +
> > > +	sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
> > > +	if (host->quirks2 & SDHCI_QUIRK2_NEED_DELAY_AFTER_INT_CLK_RST)
> > > +		mdelay(1);
> > > +
> > > +	if (clock == 0)
> > > +		return;
> > > +
> > > +	clk = sdhci_compute_clock_config(host, clock);
> > > +
> > >  	clk |= SDHCI_CLOCK_INT_EN;
> > >  	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
> > >  
> > > diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> > > index 0f39f4f..23ddd6e 100644
> > > --- a/drivers/mmc/host/sdhci.h
> > > +++ b/drivers/mmc/host/sdhci.h
> > > @@ -661,6 +661,7 @@ static inline bool sdhci_sdio_irq_enabled(struct sdhci_host *host)
> > >  	return !!(host->flags & SDHCI_SDIO_IRQ_ENABLED);
> > >  }
> > >  
> > > +u16 sdhci_compute_clock_config(struct sdhci_host *host, unsigned int clock);
> > >  void sdhci_set_clock(struct sdhci_host *host, unsigned int clock);
> > >  void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
> > >  		     unsigned short vdd);
> > > 
> >

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#1373131

FromAdrian Hunter <adrian.hunter@intel.com>
Date2016-04-07 10:00 +0200
Message-ID<rld19-xm-21@gated-at.bofh.it>
In reply to#1372591
On 06/04/16 18:04, Ludovic Desroches wrote:
> On Wed, Apr 06, 2016 at 03:37:28PM +0300, Adrian Hunter wrote:
>> On 04/04/16 18:27, Ludovic Desroches wrote:
>>> In order to remove the SDHCI_QUIRK2_NEED_DELAY_AFTER_INT_CLK_RST and to
>>> reduce code duplication, put the code relative to the SD clock
>>> configuration in a function which can be used by hosts for the
>>> implementation of the set_clock() callback.
>>>
>>> Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
>>> ---
>>>  drivers/mmc/host/sdhci.c | 33 ++++++++++++++++++++++-----------
>>>  drivers/mmc/host/sdhci.h |  1 +
>>>  2 files changed, 23 insertions(+), 11 deletions(-)
>>>
>>> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
>>> index 6bd3d17..2c3dede 100644
>>> --- a/drivers/mmc/host/sdhci.c
>>> +++ b/drivers/mmc/host/sdhci.c
>>> @@ -1091,23 +1091,13 @@ static u16 sdhci_get_preset_value(struct sdhci_host *host)
>>>  	return preset;
>>>  }
>>>  
>>> -void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
>>> +u16 sdhci_compute_clock_config(struct sdhci_host *host, unsigned int clock)
>>
>> The function name 'sdhci_compute_clock_config' seems a bit long.  How about
>> just sdhci_calc_clk.
> 
> Ok.
> 
>>
>> Also it needs to calculate 'actual_clock' too, so it needs to do that and
>> return the value.
>>
> 
> actual_clock is updated at the end of the function.
> 
> Which value has to be returned? actual_clock or clock configuration?

The function doesn't update the clock, so I don't think it should update
actual_clock either, just return it. i.e.

u16 sdhci_calc_clk(struct sdhci_host *host, unsigned int clock, unsigned int *actual_clock)
{
	...
	if (real_div)
		*actual_clock = (host->max_clk * clk_mul) / real_div;
	...
	return clk;
}

then

	clk = sdhci_calc_clk(host, clock, &host->mmc->actual_clock);



> 
> Regards
> 
> Ludovic
> 
>>>  {
>>>  	int div = 0; /* Initialized for compiler warning */
>>>  	int real_div = div, clk_mul = 1;
>>>  	u16 clk = 0;
>>> -	unsigned long timeout;
>>>  	bool switch_base_clk = false;
>>>  
>>> -	host->mmc->actual_clock = 0;
>>> -
>>> -	sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
>>> -	if (host->quirks2 & SDHCI_QUIRK2_NEED_DELAY_AFTER_INT_CLK_RST)
>>> -		mdelay(1);
>>> -
>>> -	if (clock == 0)
>>> -		return;
>>> -
>>>  	if (host->version >= SDHCI_SPEC_300) {
>>>  		if (host->preset_enabled) {
>>>  			u16 pre_val;
>>> @@ -1188,6 +1178,27 @@ clock_set:
>>>  	clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
>>>  	clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
>>>  		<< SDHCI_DIVIDER_HI_SHIFT;
>>> +
>>> +	return clk;
>>> +}
>>> +EXPORT_SYMBOL_GPL(sdhci_compute_clock_config);
>>> +
>>> +void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
>>> +{
>>> +	u16 clk;
>>> +	unsigned long timeout;
>>> +
>>> +	host->mmc->actual_clock = 0;
>>> +
>>> +	sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
>>> +	if (host->quirks2 & SDHCI_QUIRK2_NEED_DELAY_AFTER_INT_CLK_RST)
>>> +		mdelay(1);
>>> +
>>> +	if (clock == 0)
>>> +		return;
>>> +
>>> +	clk = sdhci_compute_clock_config(host, clock);
>>> +
>>>  	clk |= SDHCI_CLOCK_INT_EN;
>>>  	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
>>>  
>>> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
>>> index 0f39f4f..23ddd6e 100644
>>> --- a/drivers/mmc/host/sdhci.h
>>> +++ b/drivers/mmc/host/sdhci.h
>>> @@ -661,6 +661,7 @@ static inline bool sdhci_sdio_irq_enabled(struct sdhci_host *host)
>>>  	return !!(host->flags & SDHCI_SDIO_IRQ_ENABLED);
>>>  }
>>>  
>>> +u16 sdhci_compute_clock_config(struct sdhci_host *host, unsigned int clock);
>>>  void sdhci_set_clock(struct sdhci_host *host, unsigned int clock);
>>>  void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
>>>  		     unsigned short vdd);
>>>
>>
>

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