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

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Date:	Tue, 12 Apr 2016 14:59:15 +0200
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Adrian Hunter <adrian.hunter@...el.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	Nicolas Ferre <nicolas.ferre@...el.com>
Cc:	Ludovic Desroches <ludovic.desroches@...el.com>
Subject: Re: [PATCH v3 1/3] mmc: sdhci: introduce sdhci_compute_clock_config

On 12 April 2016 at 14:53, Ludovic Desroches
<ludovic.desroches@...el.com> wrote:
> 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?

No worries, I can amend the patch.

Kind regards
Uffe

>
>>
>> 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);
>> >
>>