[PATCH 4/9] mmc: sdhci: add a callback for using tuning block

[Y.B. Lu]

> -----Original Message-----
> From: Adrian Hunter [mailto:adrian.hunter at intel.com]
> Sent: Thursday, March 02, 2017 10:26 PM
> To: Y.B. Lu; linux-mmc at vger.kernel.org; ulf.hansson at linaro.org; Rob
> Herring; Mark Rutland; Catalin Marinas; Will Deacon
> Cc: devicetree at vger.kernel.org; linux-arm-kernel at lists.infradead.org;
> Xiaobo Xie
> Subject: Re: [PATCH 4/9] mmc: sdhci: add a callback for using tuning
> block
> 
> On 02/03/17 11:47, Yangbo Lu wrote:
> > Some non-standard SD host controllers may use tuning block for
> > executing tuning procedure.
> 
> If you need to set something up before tuning, you should be able to do
> that by hooking the host operation, for example see xenon_execute_tuning()
> in sdhci-xenon.c
> 

[Lu Yangbo-B47093] Hi Adrian, this is very helpful. I will generate the v2 patchset with this method.
Thanks you very much!

> >
> > Signed-off-by: Yangbo Lu <yangbo.lu at nxp.com>
> > ---
> >  drivers/mmc/host/sdhci.c | 3 +++
> >  drivers/mmc/host/sdhci.h | 1 +
> >  2 files changed, 4 insertions(+)
> >
> > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index
> > 3c9a924..051b192 100644
> > --- a/drivers/mmc/host/sdhci.c
> > +++ b/drivers/mmc/host/sdhci.c
> > @@ -2166,6 +2166,9 @@ int sdhci_execute_tuning(struct mmc_host *mmc,
> u32 opcode)
> >  		goto out_unlock;
> >  	}
> >
> > +	if (host->ops->set_tuning_block)
> > +		host->ops->set_tuning_block(host);
> > +
> >  	host->mmc->retune_period = tuning_count;
> >
> >  	sdhci_start_tuning(host);
> > diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index
> > 04af687..d43519b 100644
> > --- a/drivers/mmc/host/sdhci.h
> > +++ b/drivers/mmc/host/sdhci.h
> > @@ -568,6 +568,7 @@ struct sdhci_ops {
> >  					 int card_drv, int *drv_type);
> >  	int	(*start_signal_voltage_switch)(struct sdhci_host *host,
> >  					       unsigned char signal_voltage);
> > +	void	(*set_tuning_block)(struct sdhci_host *host);
> >  };
> >
> >  #ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS
> >