linux-kernel - Re: [PATCH V5 10/26] mmc: sdhci-uhs2: dump UHS-II registers

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Message-ID: <3b36c596-3353-bb2c-b92f-fb475934503a@intel.com>
Date:   Tue, 1 Nov 2022 19:13:01 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Victor Shih <victorshihgli@...il.com>, ulf.hansson@...aro.org
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        benchuanggli@...il.com, HL.Liu@...esyslogic.com.tw,
        Greg.tu@...esyslogic.com.tw, takahiro.akashi@...aro.org,
        dlunev@...omium.org, Victor Shih <victor.shih@...esyslogic.com.tw>,
        Ben Chuang <ben.chuang@...esyslogic.com.tw>
Subject: Re: [PATCH V5 10/26] mmc: sdhci-uhs2: dump UHS-II registers

On 19/10/22 14:06, Victor Shih 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-uhs2.c | 30 ++++++++++++++++++++++++++++++
>  drivers/mmc/host/sdhci-uhs2.h |  4 ++++
>  drivers/mmc/host/sdhci.c      |  3 +++
>  3 files changed, 37 insertions(+)
> 
> diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
> index f29d3a4ed43c..08905ed081fb 100644
> --- a/drivers/mmc/host/sdhci-uhs2.c
> +++ b/drivers/mmc/host/sdhci-uhs2.c
> @@ -18,6 +18,36 @@
>  #define DRIVER_NAME "sdhci_uhs2"
>  #define DBG(f, x...) \
>  	pr_debug(DRIVER_NAME " [%s()]: " f, __func__, ## x)
> +#define SDHCI_UHS2_DUMP(f, x...) \
> +	pr_err("%s: " DRIVER_NAME ": " f, mmc_hostname(host->mmc), ## x)
> +
> +void sdhci_uhs2_dump_regs(struct sdhci_host *host)
> +{
> +	if (!host->mmc || !(host->mmc->flags & MMC_UHS2_SUPPORT))

!host->mmc is not possible

> +		return;
> +
> +	SDHCI_UHS2_DUMP("==================== UHS2 ==================\n");
> +	SDHCI_UHS2_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_UHS2_DUMP("Cmd:       0x%08x | Trn mode: 0x%08x\n",
> +			sdhci_readw(host, SDHCI_UHS2_COMMAND),
> +			sdhci_readw(host, SDHCI_UHS2_TRANS_MODE));
> +	SDHCI_UHS2_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_UHS2_DUMP("Dev Int Code:  0x%08x\n",
> +			sdhci_readb(host, SDHCI_UHS2_DEV_INT_CODE));
> +	SDHCI_UHS2_DUMP("Reset:     0x%08x | Timer:    0x%08x\n",
> +			sdhci_readw(host, SDHCI_UHS2_SW_RESET),
> +			sdhci_readw(host, SDHCI_UHS2_TIMER_CTRL));
> +	SDHCI_UHS2_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_UHS2_DUMP("ErrSigEn:  0x%08x\n",
> +			sdhci_readl(host, SDHCI_UHS2_ERR_INT_SIG_EN));
> +}
> +EXPORT_SYMBOL_GPL(sdhci_uhs2_dump_regs);
>  
>  /*****************************************************************************\
>   *                                                                           *
> diff --git a/drivers/mmc/host/sdhci-uhs2.h b/drivers/mmc/host/sdhci-uhs2.h
> index 5610affebdf3..afdb05d6056b 100644
> --- a/drivers/mmc/host/sdhci-uhs2.h
> +++ b/drivers/mmc/host/sdhci-uhs2.h
> @@ -207,4 +207,8 @@
>  #define SDHCI_UHS2_EMBED_CTRL	0xE6
>  #define SDHCI_UHS2_VENDOR	0xE8
>  
> +struct sdhci_host;
> +
> +void sdhci_uhs2_dump_regs(struct sdhci_host *host);
> +
>  #endif /* __SDHCI_UHS2_H */
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index fef03de85b99..2cdd183c8ada 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -110,6 +110,9 @@ void sdhci_dumpregs(struct sdhci_host *host)
>  		}
>  	}
>  
> +	if (host->ops->dump_uhs2_regs)
> +		host->ops->dump_uhs2_regs(host);
> +
>  	if (host->ops->dump_vendor_regs)
>  		host->ops->dump_vendor_regs(host);
>