Re: [RFC PATCH 2/3] mmc: sdhci-msm: Implement platform_dumpregs callback in sdhci-msm

[Jeremy McNicoll]

On Fri, Dec 30, 2016 at 05:02:10PM +0530, Ritesh Harjani wrote:
> From: Sahitya Tummala <stummala@xxxxxxxxxxxxxx>
> 
> Implement ->platform_dumpregs host operation to print the
> platform specific registers in addition to standard SDHC
> register during error conditions.
> 
> Signed-off-by: Sahitya Tummala <stummala@xxxxxxxxxxxxxx>
> Signed-off-by: Ritesh Harjani <riteshh@xxxxxxxxxxxxxx>
> ---
>  drivers/mmc/host/sdhci-msm.c | 34 ++++++++++++++++++++++++++++++++++
>  1 file changed, 34 insertions(+)
> 
> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
> index 32879b8..1241dbd 100644
> --- a/drivers/mmc/host/sdhci-msm.c
> +++ b/drivers/mmc/host/sdhci-msm.c
> @@ -29,6 +29,11 @@
>  #define CORE_VERSION_MAJOR_MASK		(0xf << CORE_VERSION_MAJOR_SHIFT)
>  #define CORE_VERSION_MINOR_MASK		0xff
>  
> +#define CORE_MCI_DATA_CNT	0x30
> +#define CORE_MCI_STATUS		0x34
> +#define CORE_MCI_FIFO_CNT	0x44
> +#define CORE_MCI_STATUS2	0x6c
> +
>  #define CORE_HC_MODE		0x78
>  #define HC_MODE_EN		0x1
>  #define CORE_POWER		0x0
> @@ -77,6 +82,10 @@
>  #define CORE_HC_SELECT_IN_HS400	(6 << 19)
>  #define CORE_HC_SELECT_IN_MASK	(7 << 19)
>  
> +#define CORE_VENDOR_SPEC_FUNC2		0x110
> +#define CORE_VENDOR_SPEC_ADMA_ERR_ADDR0	0x114
> +#define CORE_VENDOR_SPEC_ADMA_ERR_ADDR1	0x118
> +
>  #define CORE_CSR_CDC_CTLR_CFG0		0x130
>  #define CORE_SW_TRIG_FULL_CALIB		BIT(16)
>  #define CORE_HW_AUTOCAL_ENA		BIT(17)
> @@ -658,6 +667,30 @@ static int sdhci_msm_hs400_dll_calibration(struct sdhci_host *host)
>  	return ret;
>  }
>  
> +static void sdhci_msm_dumpregs(struct sdhci_host *host)
> +{
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
> +
> +	pr_err("----------- PLATFORM REGISTER DUMP -----------\n");
> +
> +	pr_err("Data cnt: 0x%08x | Fifo cnt: 0x%08x | Int sts: 0x%08x | Int sts2: 0x%08x\n",
> +	       readl_relaxed(msm_host->core_mem + CORE_MCI_DATA_CNT),
> +	       readl_relaxed(msm_host->core_mem + CORE_MCI_FIFO_CNT),
> +	       readl_relaxed(msm_host->core_mem + CORE_MCI_STATUS),
> +	       readl_relaxed(msm_host->core_mem + CORE_MCI_STATUS2));
> +	pr_err("DLL cfg:  0x%08x | DLL sts:  0x%08x | SDCC ver: 0x%08x\n",
> +	       readl_relaxed(host->ioaddr + CORE_DLL_CONFIG),
> +	       readl_relaxed(host->ioaddr + CORE_DLL_STATUS),
> +	       readl_relaxed(msm_host->core_mem + CORE_MCI_VERSION));
> +	pr_err("Vndr func: 0x%08x | Vndr adma err : addr0: 0x%08x addr1: 0x%08x\n",
> +	       readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC),
> +	       readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC_ADMA_ERR_ADDR0),
> +	       readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC_ADMA_ERR_ADDR1));
> +	pr_err("Vndr func2: 0x%08x\n",
> +	       readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC_FUNC2));
> +}
> +

Why did you omit the printing of CORE_TESTBUS_CONFIG like that of 
https://patchwork.kernel.org/patch/9442449/

and sdhci_dump_state() was dropped too.  Being able to dump the rpm_info
was very handy for issues I was running into.

-jeremy

>  static int sdhci_msm_execute_tuning(struct sdhci_host *host, u32 opcode)
>  {
>  	int tuning_seq_cnt = 3;
> @@ -1035,6 +1068,7 @@ static void sdhci_msm_set_clock(struct sdhci_host *host, unsigned int clock)
>  	.set_bus_width = sdhci_set_bus_width,
>  	.set_uhs_signaling = sdhci_msm_set_uhs_signaling,
>  	.voltage_switch = sdhci_msm_voltage_switch,
> +	.platform_dumpregs = sdhci_msm_dumpregs,
>  };
>  
>  static const struct sdhci_pltfm_data sdhci_msm_pdata = {
> -- 
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> a Linux Foundation Collaborative Project.
>