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

[Ritesh Harjani <riteshh@codeaurora.org>]

Hi Jeremy,

On 1/14/2017 4:01 AM, Jeremy McNicoll wrote:
> On Fri, Dec 30, 2016 at 05:02:10PM +0530, Ritesh Harjani wrote:
>> From: Sahitya Tummala <stummala@codeaurora.org>
>>
>> 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@codeaurora.org>
>> Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>
>> ---
>>  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/
Actually testbus registers aren't something we analyze every-time.
So I have skipped it for now. We can add it later if and when required.


>
> and sdhci_dump_state() was dropped too.  Being able to dump the rpm_info
> was very handy for issues I was running into.
Sure, let me add that info as well.

>
> -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 = {
>> --
>> The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
>> a Linux Foundation Collaborative Project.
>>

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project