linux-kernel - Re: [PATCH v3 1/3] mmc: sdhci: introduce sdhci_compute_clock

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Date:	Tue, 12 Apr 2016 14:53:36 +0200
From:	Ludovic Desroches <ludovic.desroches@...el.com>
To:	Adrian Hunter <adrian.hunter@...el.com>
CC:	Ludovic Desroches <ludovic.desroches@...el.com>,
	<ulf.hansson@...aro.org>, <linux-kernel@...r.kernel.org>,
	<linux-mmc@...r.kernel.org>, <nicolas.ferre@...el.com>
Subject: Re: [PATCH v3 1/3] mmc: sdhci: introduce sdhci_compute_clock_config

On Tue, Apr 12, 2016 at 03:31:46PM +0300, Adrian Hunter wrote:
> On 07/04/16 12:13, 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@...el.com>
> 
> The subject needs changing to reflect the new function name i.e.
> sdhci_compute_clock_config -> sdhci_calc_clk

Oh yes... sorry. Ulf, do you want me to resend it?

> 
> Otherwise, for all 3 patches:
> 
> Acked-by: Adrian Hunter <adrian.hunter@...el.com>
> 
> > ---
> >  drivers/mmc/host/sdhci.c | 36 ++++++++++++++++++++++++------------
> >  drivers/mmc/host/sdhci.h |  2 ++
> >  2 files changed, 26 insertions(+), 12 deletions(-)
> > 
> > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> > index 6bd3d17..abd34d1 100644
> > --- a/drivers/mmc/host/sdhci.c
> > +++ b/drivers/mmc/host/sdhci.c
> > @@ -1091,23 +1091,14 @@ 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_calc_clk(struct sdhci_host *host, unsigned int clock,
> > +		   unsigned int *actual_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;
> > @@ -1184,10 +1175,31 @@ void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
> >  
> >  clock_set:
> >  	if (real_div)
> > -		host->mmc->actual_clock = (host->max_clk * clk_mul) / real_div;
> > +		*actual_clock = (host->max_clk * clk_mul) / real_div;
> >  	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_calc_clk);
> > +
> > +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_calc_clk(host, clock, &host->mmc->actual_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..9db5090 100644
> > --- a/drivers/mmc/host/sdhci.h
> > +++ b/drivers/mmc/host/sdhci.h
> > @@ -661,6 +661,8 @@ static inline bool sdhci_sdio_irq_enabled(struct sdhci_host *host)
> >  	return !!(host->flags & SDHCI_SDIO_IRQ_ENABLED);
> >  }
> >  
> > +u16 sdhci_calc_clk(struct sdhci_host *host, unsigned int clock,
> > +		   unsigned int *actual_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);
> > 
>