linux-kernel - Re: [RFC PATCH V3 10/21] mmc: sdhci: UHS-II support, dump UHS-II registers

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Message-ID: <20200915064905.GD2860208@laputa>
Date:   Tue, 15 Sep 2020 15:49:05 +0900
From:   AKASHI Takahiro <takahiro.akashi@...aro.org>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Ben Chuang <benchuanggli@...il.com>, ulf.hansson@...aro.org,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        ben.chuang@...esyslogic.com.tw, greg.tu@...esyslogic.com.tw
Subject: Re: [RFC PATCH V3 10/21] mmc: sdhci: UHS-II support, dump UHS-II
 registers

On Fri, Aug 21, 2020 at 05:04:54PM +0300, Adrian Hunter wrote:
> On 10/07/20 2:10 pm, Ben Chuang wrote:
> > From: AKASHI Takahiro <takahiro.akashi@...aro.org>
> > 
> > Dump UHS-II specific registers, if available, in sdhci_dumpregs()
> > for informative/debugging use.
> > 
> > Signed-off-by: Ben Chuang <ben.chuang@...esyslogic.com.tw>
> > Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
> > ---
> >  drivers/mmc/host/sdhci.c | 24 ++++++++++++++++++++++++
> >  1 file changed, 24 insertions(+)
> > 
> > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> > index 37b1158c1c0c..c2f6923d296c 100644
> > --- a/drivers/mmc/host/sdhci.c
> > +++ b/drivers/mmc/host/sdhci.c
> > @@ -111,6 +111,30 @@ void sdhci_dumpregs(struct sdhci_host *host)
> >  		}
> >  	}
> >  
> > +	if (IS_ENABLED(CONFIG_MMC_SDHCI_UHS2) &&
> > +	    host->mmc && host->mmc->flags & MMC_UHS2_SUPPORT) {
> > +		SDHCI_DUMP("==================== UHS2 ==================\n");
> > +		SDHCI_DUMP("Blk Size:  0x%08x | Blk Cnt:  0x%08x\n",
> > +			   sdhci_readw(host, SDHCI_UHS2_BLOCK_SIZE),
> > +			   sdhci_readl(host, SDHCI_UHS2_BLOCK_COUNT));
> > +		SDHCI_DUMP("Cmd:       0x%08x | Trn mode: 0x%08x\n",
> > +			   sdhci_readw(host, SDHCI_UHS2_COMMAND),
> > +			   sdhci_readw(host, SDHCI_UHS2_TRANS_MODE));
> > +		SDHCI_DUMP("Int Stat:  0x%08x | Dev Sel : 0x%08x\n",
> > +			   sdhci_readw(host, SDHCI_UHS2_DEV_INT_STATUS),
> > +			   sdhci_readb(host, SDHCI_UHS2_DEV_SELECT));
> > +		SDHCI_DUMP("Dev Int Code:  0x%08x\n",
> > +			   sdhci_readb(host, SDHCI_UHS2_DEV_INT_CODE));
> > +		SDHCI_DUMP("Reset:     0x%08x | Timer:    0x%08x\n",
> > +			   sdhci_readw(host, SDHCI_UHS2_SW_RESET),
> > +			   sdhci_readw(host, SDHCI_UHS2_TIMER_CTRL));
> > +		SDHCI_DUMP("ErrInt:    0x%08x | ErrIntEn: 0x%08x\n",
> > +			   sdhci_readl(host, SDHCI_UHS2_ERR_INT_STATUS),
> > +			   sdhci_readl(host, SDHCI_UHS2_ERR_INT_STATUS_EN));
> > +		SDHCI_DUMP("ErrSigEn:  0x%08x\n",
> > +			   sdhci_readl(host, SDHCI_UHS2_ERR_INT_SIG_EN));
> > +	}
> > +
> 
> Let's make this a host op instead ie.
> 
> 	if (host->ops->dump_uhs2_regs)
> 		host->ops->dump_uhs2_regs(host);

Sure.

-Takahiro Akashi

> >  	if (host->ops->dump_vendor_regs)
> >  		host->ops->dump_vendor_regs(host);
> >  
> > 
>