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[PATCH] mmc: sdhci-msm: Add sysfs attribute for error state in SDHCI MSM driver

Sachin Gupta posted 1 patch 1 month ago 
drivers/mmc/host/sdhci-msm.c | 40 ++++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
[PATCH] mmc: sdhci-msm: Add sysfs attribute for error state in SDHCI MSM driver
Posted by Sachin Gupta 1 month ago 
Introduce a new sysfs attribute err_state to the SDHCI MSM driver.
The attribute allows users to query the error state of the SDHCI host controller.

Signed-off-by: Sachin Gupta <quic_sachgupt@quicinc.com>
Signed-off-by: Sarthak Garg <quic_sartgarg@quicinc.com>
---
 drivers/mmc/host/sdhci-msm.c | 40 ++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index e113b99a3eab..a256e3569a92 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -290,6 +290,7 @@ struct sdhci_msm_host {
 	u32 dll_config;
 	u32 ddr_config;
 	bool vqmmc_enabled;
+	bool err_occurred;
 };
 
 static const struct sdhci_msm_offset *sdhci_priv_msm_offset(struct sdhci_host *host)
@@ -2255,6 +2256,8 @@ static void sdhci_msm_dump_vendor_regs(struct sdhci_host *host)
 	struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
 	const struct sdhci_msm_offset *msm_offset = msm_host->offset;
 
+	msm_host->err_occurred = true;
+
 	SDHCI_MSM_DUMP("----------- VENDOR REGISTER DUMP -----------\n");
 
 	SDHCI_MSM_DUMP(
@@ -2398,6 +2401,41 @@ static int sdhci_msm_gcc_reset(struct device *dev, struct sdhci_host *host)
 	return ret;
 }
 
+static ssize_t err_state_show(struct device *dev,
+			struct device_attribute *attr, char *buf)
+{
+	struct sdhci_host *host = dev_get_drvdata(dev);
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
+
+	if (!host || !host->mmc)
+		return -EINVAL;
+
+	return scnprintf(buf, PAGE_SIZE, "%d\n", !!msm_host->err_occurred);
+}
+
+static DEVICE_ATTR_RO(err_state);
+
+static struct attribute *sdhci_msm_sysfs_attrs[] = {
+	&dev_attr_err_state.attr,
+	NULL
+};
+
+static const struct attribute_group sdhci_msm_sysfs_group = {
+	.name = "qcom",
+	.attrs = sdhci_msm_sysfs_attrs,
+};
+
+static void sdhci_msm_init_sysfs(struct device *dev)
+{
+	int ret;
+
+	ret = sysfs_create_group(&dev->kobj, &sdhci_msm_sysfs_group);
+	if (ret)
+		dev_err(dev, "%s: Failed to create qcom sysfs group (err = %d)\n",
+				__func__, ret);
+}
+
 static int sdhci_msm_probe(struct platform_device *pdev)
 {
 	struct sdhci_host *host;
@@ -2442,6 +2480,8 @@ static int sdhci_msm_probe(struct platform_device *pdev)
 	sdhci_get_of_property(pdev);
 	sdhci_msm_get_of_property(pdev, host);
 
+	sdhci_msm_init_sysfs(&pdev->dev);
+
 	msm_host->saved_tuning_phase = INVALID_TUNING_PHASE;
 
 	ret = sdhci_msm_gcc_reset(&pdev->dev, host);
-- 
2.17.1
Re: [PATCH] mmc: sdhci-msm: Add sysfs attribute for error state in SDHCI MSM driver
Posted by Adrian Hunter 1 month ago 
On 22/10/24 17:16, Sachin Gupta wrote:
> Introduce a new sysfs attribute err_state to the SDHCI MSM driver.
> The attribute allows users to query the error state of the SDHCI host controller.

We already have err_stats and err_state in debugfs.  That seems
more appropriate.

> 
> Signed-off-by: Sachin Gupta <quic_sachgupt@quicinc.com>
> Signed-off-by: Sarthak Garg <quic_sartgarg@quicinc.com>
> ---
>  drivers/mmc/host/sdhci-msm.c | 40 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 40 insertions(+)
> 
> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
> index e113b99a3eab..a256e3569a92 100644
> --- a/drivers/mmc/host/sdhci-msm.c
> +++ b/drivers/mmc/host/sdhci-msm.c
> @@ -290,6 +290,7 @@ struct sdhci_msm_host {
>  	u32 dll_config;
>  	u32 ddr_config;
>  	bool vqmmc_enabled;
> +	bool err_occurred;
>  };
>  
>  static const struct sdhci_msm_offset *sdhci_priv_msm_offset(struct sdhci_host *host)
> @@ -2255,6 +2256,8 @@ static void sdhci_msm_dump_vendor_regs(struct sdhci_host *host)
>  	struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
>  	const struct sdhci_msm_offset *msm_offset = msm_host->offset;
>  
> +	msm_host->err_occurred = true;
> +
>  	SDHCI_MSM_DUMP("----------- VENDOR REGISTER DUMP -----------\n");
>  
>  	SDHCI_MSM_DUMP(
> @@ -2398,6 +2401,41 @@ static int sdhci_msm_gcc_reset(struct device *dev, struct sdhci_host *host)
>  	return ret;
>  }
>  
> +static ssize_t err_state_show(struct device *dev,
> +			struct device_attribute *attr, char *buf)
> +{
> +	struct sdhci_host *host = dev_get_drvdata(dev);
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
> +
> +	if (!host || !host->mmc)
> +		return -EINVAL;
> +
> +	return scnprintf(buf, PAGE_SIZE, "%d\n", !!msm_host->err_occurred);
> +}
> +
> +static DEVICE_ATTR_RO(err_state);
> +
> +static struct attribute *sdhci_msm_sysfs_attrs[] = {
> +	&dev_attr_err_state.attr,
> +	NULL
> +};
> +
> +static const struct attribute_group sdhci_msm_sysfs_group = {
> +	.name = "qcom",
> +	.attrs = sdhci_msm_sysfs_attrs,
> +};
> +
> +static void sdhci_msm_init_sysfs(struct device *dev)
> +{
> +	int ret;
> +
> +	ret = sysfs_create_group(&dev->kobj, &sdhci_msm_sysfs_group);
> +	if (ret)
> +		dev_err(dev, "%s: Failed to create qcom sysfs group (err = %d)\n",
> +				__func__, ret);
> +}
> +
>  static int sdhci_msm_probe(struct platform_device *pdev)
>  {
>  	struct sdhci_host *host;
> @@ -2442,6 +2480,8 @@ static int sdhci_msm_probe(struct platform_device *pdev)
>  	sdhci_get_of_property(pdev);
>  	sdhci_msm_get_of_property(pdev, host);
>  
> +	sdhci_msm_init_sysfs(&pdev->dev);
> +
>  	msm_host->saved_tuning_phase = INVALID_TUNING_PHASE;
>  
>  	ret = sdhci_msm_gcc_reset(&pdev->dev, host);
Re: [PATCH] mmc: sdhci-msm: Add sysfs attribute for error state in SDHCI MSM driver
Posted by Sachin Gupta 1 month ago 

On 10/24/2024 4:54 PM, Adrian Hunter wrote:
> On 22/10/24 17:16, Sachin Gupta wrote:
>> Introduce a new sysfs attribute err_state to the SDHCI MSM driver.
>> The attribute allows users to query the error state of the SDHCI host controller.
> 
> We already have err_stats and err_state in debugfs.  That seems
> more appropriate.
> 

Thanks Adrian for pointing this out. I will check and get back.

>>
>> Signed-off-by: Sachin Gupta <quic_sachgupt@quicinc.com>
>> Signed-off-by: Sarthak Garg <quic_sartgarg@quicinc.com>
>> ---
>>   drivers/mmc/host/sdhci-msm.c | 40 ++++++++++++++++++++++++++++++++++++
>>   1 file changed, 40 insertions(+)
>>
>> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
>> index e113b99a3eab..a256e3569a92 100644
>> --- a/drivers/mmc/host/sdhci-msm.c
>> +++ b/drivers/mmc/host/sdhci-msm.c
>> @@ -290,6 +290,7 @@ struct sdhci_msm_host {
>>   	u32 dll_config;
>>   	u32 ddr_config;
>>   	bool vqmmc_enabled;
>> +	bool err_occurred;
>>   };
>>   
>>   static const struct sdhci_msm_offset *sdhci_priv_msm_offset(struct sdhci_host *host)
>> @@ -2255,6 +2256,8 @@ static void sdhci_msm_dump_vendor_regs(struct sdhci_host *host)
>>   	struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
>>   	const struct sdhci_msm_offset *msm_offset = msm_host->offset;
>>   
>> +	msm_host->err_occurred = true;
>> +
>>   	SDHCI_MSM_DUMP("----------- VENDOR REGISTER DUMP -----------\n");
>>   
>>   	SDHCI_MSM_DUMP(
>> @@ -2398,6 +2401,41 @@ static int sdhci_msm_gcc_reset(struct device *dev, struct sdhci_host *host)
>>   	return ret;
>>   }
>>   
>> +static ssize_t err_state_show(struct device *dev,
>> +			struct device_attribute *attr, char *buf)
>> +{
>> +	struct sdhci_host *host = dev_get_drvdata(dev);
>> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>> +	struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
>> +
>> +	if (!host || !host->mmc)
>> +		return -EINVAL;
>> +
>> +	return scnprintf(buf, PAGE_SIZE, "%d\n", !!msm_host->err_occurred);
>> +}
>> +
>> +static DEVICE_ATTR_RO(err_state);
>> +
>> +static struct attribute *sdhci_msm_sysfs_attrs[] = {
>> +	&dev_attr_err_state.attr,
>> +	NULL
>> +};
>> +
>> +static const struct attribute_group sdhci_msm_sysfs_group = {
>> +	.name = "qcom",
>> +	.attrs = sdhci_msm_sysfs_attrs,
>> +};
>> +
>> +static void sdhci_msm_init_sysfs(struct device *dev)
>> +{
>> +	int ret;
>> +
>> +	ret = sysfs_create_group(&dev->kobj, &sdhci_msm_sysfs_group);
>> +	if (ret)
>> +		dev_err(dev, "%s: Failed to create qcom sysfs group (err = %d)\n",
>> +				__func__, ret);
>> +}
>> +
>>   static int sdhci_msm_probe(struct platform_device *pdev)
>>   {
>>   	struct sdhci_host *host;
>> @@ -2442,6 +2480,8 @@ static int sdhci_msm_probe(struct platform_device *pdev)
>>   	sdhci_get_of_property(pdev);
>>   	sdhci_msm_get_of_property(pdev, host);
>>   
>> +	sdhci_msm_init_sysfs(&pdev->dev);
>> +
>>   	msm_host->saved_tuning_phase = INVALID_TUNING_PHASE;
>>   
>>   	ret = sdhci_msm_gcc_reset(&pdev->dev, host);
>

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