[PATCH v2 0/3] Fix build issue when CONFIG_MODULES is not set

[PATCH v2 0/3] Fix build issue when CONFIG_MODULES is not set

[Pratap Nirujogi]

When CONFIG_MODULES is not defined, 'adap->owner->name' used in amd_isp4 platform
driver will not be valid and is resulting in build failures.

../drivers/platform/x86/amd/amd_isp4.c: In function 'is_isp_i2c_adapter':
../drivers/platform/x86/amd/amd_isp4.c:154:35: error: invalid use of undefined type 'struct module'
  154 |         return !strcmp(adap->owner->name, "i2c_designware_amdisp");
      |                                   ^~

To fix this issue, need to make changes both in platform and i2c driver modules.

* In the amd_isp4 x86/platform driver, replace 'adap->owner->name' with 'adap->name', this removes
the hard dependency on 'struct module'.
* In i2c amdisp driver, initialize unique name to i2c adapter and also make a change in
i2c-designware-common to avoid overwriting with generic name when adap->name[] is already set.

---

Changes v1 -> v2:

* Replace snprintf with scnprintf
* Add new isp4 specific misc header file to include the adapter name
* Remove 'Fixes' and 'Link' tags from i2c patches

---

Pratap Nirujogi (3):
  i2c: designware: Initialize adapter name only when not set
  i2c: amd-isp: Initialize unique adpater name
  platform/x86: Use i2c adapter name to fix build errors

 drivers/i2c/busses/i2c-designware-amdisp.c |  2 ++
 drivers/i2c/busses/i2c-designware-master.c |  5 +++--
 drivers/platform/x86/amd/amd_isp4.c        |  3 ++-
 include/linux/soc/amd/isp4_misc.h          | 12 ++++++++++++
 4 files changed, 19 insertions(+), 3 deletions(-)
 create mode 100644 include/linux/soc/amd/isp4_misc.h

-- 
2.43.0

[PATCH v2 1/3] i2c: designware: Initialize adapter name only when not set

[Pratap Nirujogi]

Check if the adapter name is already set in the driver prior
to initializing with generic name in i2c_dw_probe_master().

Signed-off-by: Pratap Nirujogi <pratap.nirujogi@amd.com>
---
 drivers/i2c/busses/i2c-designware-master.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/i2c/busses/i2c-designware-master.c b/drivers/i2c/busses/i2c-designware-master.c
index c5394229b77f..9d7d9e47564a 100644
--- a/drivers/i2c/busses/i2c-designware-master.c
+++ b/drivers/i2c/busses/i2c-designware-master.c
@@ -1042,8 +1042,9 @@ int i2c_dw_probe_master(struct dw_i2c_dev *dev)
 	if (ret)
 		return ret;
 
-	snprintf(adap->name, sizeof(adap->name),
-		 "Synopsys DesignWare I2C adapter");
+	if (!adap->name[0])
+		scnprintf(adap->name, sizeof(adap->name),
+			  "Synopsys DesignWare I2C adapter");
 	adap->retries = 3;
 	adap->algo = &i2c_dw_algo;
 	adap->quirks = &i2c_dw_quirks;
-- 
2.43.0

[PATCH v2 2/3] i2c: amd-isp: Initialize unique adpater name

[Pratap Nirujogi]

Initialize unique name for amdisp i2c adapter, which is used
in the platform driver to detect the matching adapter for
i2c_client creation.

Add definition of amdisp i2c adapter name in a new header file
(include/linux/soc/amd/isp4_misc.h) as it is referred in different
driver modules.

Signed-off-by: Pratap Nirujogi <pratap.nirujogi@amd.com>
---
 drivers/i2c/busses/i2c-designware-amdisp.c |  2 ++
 include/linux/soc/amd/isp4_misc.h          | 12 ++++++++++++
 2 files changed, 14 insertions(+)
 create mode 100644 include/linux/soc/amd/isp4_misc.h

diff --git a/drivers/i2c/busses/i2c-designware-amdisp.c b/drivers/i2c/busses/i2c-designware-amdisp.c
index ad6f08338124..450793d5f839 100644
--- a/drivers/i2c/busses/i2c-designware-amdisp.c
+++ b/drivers/i2c/busses/i2c-designware-amdisp.c
@@ -8,6 +8,7 @@
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
+#include <linux/soc/amd/isp4_misc.h>
 
 #include "i2c-designware-core.h"
 
@@ -62,6 +63,7 @@ static int amd_isp_dw_i2c_plat_probe(struct platform_device *pdev)
 
 	adap = &isp_i2c_dev->adapter;
 	adap->owner = THIS_MODULE;
+	scnprintf(adap->name, sizeof(adap->name), AMDISP_I2C_ADAP_NAME);
 	ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev));
 	adap->dev.of_node = pdev->dev.of_node;
 	/* use dynamically allocated adapter id */
diff --git a/include/linux/soc/amd/isp4_misc.h b/include/linux/soc/amd/isp4_misc.h
new file mode 100644
index 000000000000..6738796986a7
--- /dev/null
+++ b/include/linux/soc/amd/isp4_misc.h
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/*
+ * Copyright (C) 2025 Advanced Micro Devices, Inc.
+ */
+
+#ifndef __SOC_ISP4_MISC_H
+#define __SOC_ISP4_MISC_H
+
+#define AMDISP_I2C_ADAP_NAME "AMDISP DesignWare I2C adapter"
+
+#endif
-- 
2.43.0

[PATCH v2 3/3] platform/x86: Use i2c adapter name to fix build errors

[Pratap Nirujogi]

Use adapater->name inplace of adapter->owner->name to fix
build issues when CONFIG_MODULES is not defined.

Fixes: 90b85567e457 ("platform/x86: Add AMD ISP platform config for OV05C10")
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/all/04577a46-9add-420c-b181-29bad582026d@infradead.org
Signed-off-by: Pratap Nirujogi <pratap.nirujogi@amd.com>
---
 drivers/platform/x86/amd/amd_isp4.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/amd/amd_isp4.c b/drivers/platform/x86/amd/amd_isp4.c
index 0cc01441bcbb..9f291aeb35f1 100644
--- a/drivers/platform/x86/amd/amd_isp4.c
+++ b/drivers/platform/x86/amd/amd_isp4.c
@@ -11,6 +11,7 @@
 #include <linux/mutex.h>
 #include <linux/platform_device.h>
 #include <linux/property.h>
+#include <linux/soc/amd/isp4_misc.h>
 #include <linux/string.h>
 #include <linux/types.h>
 #include <linux/units.h>
@@ -151,7 +152,7 @@ MODULE_DEVICE_TABLE(acpi, amdisp_sensor_ids);
 
 static inline bool is_isp_i2c_adapter(struct i2c_adapter *adap)
 {
-	return !strcmp(adap->owner->name, "i2c_designware_amdisp");
+	return !strcmp(adap->name, AMDISP_I2C_ADAP_NAME);
 }
 
 static void instantiate_isp_i2c_client(struct amdisp_platform *isp4_platform,
-- 
2.43.0

Re: [PATCH v2 2/3] i2c: amd-isp: Initialize unique adpater name

[Randy Dunlap]

On 6/3/25 2:40 PM, Pratap Nirujogi wrote:
> Initialize unique name for amdisp i2c adapter, which is used
> in the platform driver to detect the matching adapter for
> i2c_client creation.
> 
> Add definition of amdisp i2c adapter name in a new header file
> (include/linux/soc/amd/isp4_misc.h) as it is referred in different
> driver modules.
> 
> Signed-off-by: Pratap Nirujogi <pratap.nirujogi@amd.com>

Tested-by: Randy Dunlap <rdunlap@infradead.org>

Thanks.

> ---
>  drivers/i2c/busses/i2c-designware-amdisp.c |  2 ++
>  include/linux/soc/amd/isp4_misc.h          | 12 ++++++++++++
>  2 files changed, 14 insertions(+)
>  create mode 100644 include/linux/soc/amd/isp4_misc.h
> 
> diff --git a/drivers/i2c/busses/i2c-designware-amdisp.c b/drivers/i2c/busses/i2c-designware-amdisp.c
> index ad6f08338124..450793d5f839 100644
> --- a/drivers/i2c/busses/i2c-designware-amdisp.c
> +++ b/drivers/i2c/busses/i2c-designware-amdisp.c
> @@ -8,6 +8,7 @@
>  #include <linux/module.h>
>  #include <linux/platform_device.h>
>  #include <linux/pm_runtime.h>
> +#include <linux/soc/amd/isp4_misc.h>
>  
>  #include "i2c-designware-core.h"
>  
> @@ -62,6 +63,7 @@ static int amd_isp_dw_i2c_plat_probe(struct platform_device *pdev)
>  
>  	adap = &isp_i2c_dev->adapter;
>  	adap->owner = THIS_MODULE;
> +	scnprintf(adap->name, sizeof(adap->name), AMDISP_I2C_ADAP_NAME);
>  	ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev));
>  	adap->dev.of_node = pdev->dev.of_node;
>  	/* use dynamically allocated adapter id */
> diff --git a/include/linux/soc/amd/isp4_misc.h b/include/linux/soc/amd/isp4_misc.h
> new file mode 100644
> index 000000000000..6738796986a7
> --- /dev/null
> +++ b/include/linux/soc/amd/isp4_misc.h
> @@ -0,0 +1,12 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +
> +/*
> + * Copyright (C) 2025 Advanced Micro Devices, Inc.
> + */
> +
> +#ifndef __SOC_ISP4_MISC_H
> +#define __SOC_ISP4_MISC_H
> +
> +#define AMDISP_I2C_ADAP_NAME "AMDISP DesignWare I2C adapter"
> +
> +#endif

-- 
~Randy

Re: [PATCH v2 3/3] platform/x86: Use i2c adapter name to fix build errors

[Randy Dunlap]

On 6/3/25 2:40 PM, Pratap Nirujogi wrote:
> Use adapater->name inplace of adapter->owner->name to fix
> build issues when CONFIG_MODULES is not defined.
> 
> Fixes: 90b85567e457 ("platform/x86: Add AMD ISP platform config for OV05C10")
> Reported-by: Randy Dunlap <rdunlap@infradead.org>
> Link: https://lore.kernel.org/all/04577a46-9add-420c-b181-29bad582026d@infradead.org
> Signed-off-by: Pratap Nirujogi <pratap.nirujogi@amd.com>

Tested-by: Randy Dunlap <rdunlap@infradead.org>
Thanks.


> ---
>  drivers/platform/x86/amd/amd_isp4.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/platform/x86/amd/amd_isp4.c b/drivers/platform/x86/amd/amd_isp4.c
> index 0cc01441bcbb..9f291aeb35f1 100644
> --- a/drivers/platform/x86/amd/amd_isp4.c
> +++ b/drivers/platform/x86/amd/amd_isp4.c
> @@ -11,6 +11,7 @@
>  #include <linux/mutex.h>
>  #include <linux/platform_device.h>
>  #include <linux/property.h>
> +#include <linux/soc/amd/isp4_misc.h>
>  #include <linux/string.h>
>  #include <linux/types.h>
>  #include <linux/units.h>
> @@ -151,7 +152,7 @@ MODULE_DEVICE_TABLE(acpi, amdisp_sensor_ids);
>  
>  static inline bool is_isp_i2c_adapter(struct i2c_adapter *adap)
>  {
> -	return !strcmp(adap->owner->name, "i2c_designware_amdisp");
> +	return !strcmp(adap->name, AMDISP_I2C_ADAP_NAME);
>  }
>  
>  static void instantiate_isp_i2c_client(struct amdisp_platform *isp4_platform,

-- 
~Randy

Re: [PATCH v2 1/3] i2c: designware: Initialize adapter name only when not set

[Randy Dunlap]

On 6/3/25 2:40 PM, Pratap Nirujogi wrote:
> Check if the adapter name is already set in the driver prior
> to initializing with generic name in i2c_dw_probe_master().

That explains what but not why. Commits should also explain
why they are doing something.

> 
> Signed-off-by: Pratap Nirujogi <pratap.nirujogi@amd.com>

Tested-by: Randy Dunlap <rdunlap@infradead.org>

Thanks.


> ---
>  drivers/i2c/busses/i2c-designware-master.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-designware-master.c b/drivers/i2c/busses/i2c-designware-master.c
> index c5394229b77f..9d7d9e47564a 100644
> --- a/drivers/i2c/busses/i2c-designware-master.c
> +++ b/drivers/i2c/busses/i2c-designware-master.c
> @@ -1042,8 +1042,9 @@ int i2c_dw_probe_master(struct dw_i2c_dev *dev)
>  	if (ret)
>  		return ret;
>  
> -	snprintf(adap->name, sizeof(adap->name),
> -		 "Synopsys DesignWare I2C adapter");
> +	if (!adap->name[0])
> +		scnprintf(adap->name, sizeof(adap->name),
> +			  "Synopsys DesignWare I2C adapter");
>  	adap->retries = 3;
>  	adap->algo = &i2c_dw_algo;
>  	adap->quirks = &i2c_dw_quirks;

-- 
~Randy

Re: [PATCH v2 1/3] i2c: designware: Initialize adapter name only when not set

[Nirujogi, Pratap]

On 6/3/2025 6:50 PM, Randy Dunlap wrote:
> Caution: This message originated from an External Source. Use proper caution when opening attachments, clicking links, or responding.
> 
> 
> On 6/3/25 2:40 PM, Pratap Nirujogi wrote:
>> Check if the adapter name is already set in the driver prior
>> to initializing with generic name in i2c_dw_probe_master().
> 
> That explains what but not why. Commits should also explain
> why they are doing something.
> 
Thanks Randy. I will take care of updating the commit text explaining 
why this change is needed in the next patch.

>>
>> Signed-off-by: Pratap Nirujogi <pratap.nirujogi@amd.com>
> 
> Tested-by: Randy Dunlap <rdunlap@infradead.org>
> 
> Thanks.
> 
> 
>> ---
>>   drivers/i2c/busses/i2c-designware-master.c | 5 +++--
>>   1 file changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/i2c/busses/i2c-designware-master.c b/drivers/i2c/busses/i2c-designware-master.c
>> index c5394229b77f..9d7d9e47564a 100644
>> --- a/drivers/i2c/busses/i2c-designware-master.c
>> +++ b/drivers/i2c/busses/i2c-designware-master.c
>> @@ -1042,8 +1042,9 @@ int i2c_dw_probe_master(struct dw_i2c_dev *dev)
>>        if (ret)
>>                return ret;
>>
>> -     snprintf(adap->name, sizeof(adap->name),
>> -              "Synopsys DesignWare I2C adapter");
>> +     if (!adap->name[0])
>> +             scnprintf(adap->name, sizeof(adap->name),
>> +                       "Synopsys DesignWare I2C adapter");
>>        adap->retries = 3;
>>        adap->algo = &i2c_dw_algo;
>>        adap->quirks = &i2c_dw_quirks;
> 
> --
> ~Randy

Re: [PATCH v2 2/3] i2c: amd-isp: Initialize unique adpater name

[Nirujogi, Pratap]

On 6/3/2025 6:48 PM, Randy Dunlap wrote:
> Caution: This message originated from an External Source. Use proper caution when opening attachments, clicking links, or responding.
> 
> 
> On 6/3/25 2:40 PM, Pratap Nirujogi wrote:
>> Initialize unique name for amdisp i2c adapter, which is used
>> in the platform driver to detect the matching adapter for
>> i2c_client creation.
>>
>> Add definition of amdisp i2c adapter name in a new header file
>> (include/linux/soc/amd/isp4_misc.h) as it is referred in different
>> driver modules.
>>
>> Signed-off-by: Pratap Nirujogi <pratap.nirujogi@amd.com>
> 
> Tested-by: Randy Dunlap <rdunlap@infradead.org>
> 
Thanks Randy!

> Thanks.
> 
>> ---
>>   drivers/i2c/busses/i2c-designware-amdisp.c |  2 ++
>>   include/linux/soc/amd/isp4_misc.h          | 12 ++++++++++++
>>   2 files changed, 14 insertions(+)
>>   create mode 100644 include/linux/soc/amd/isp4_misc.h
>>
>> diff --git a/drivers/i2c/busses/i2c-designware-amdisp.c b/drivers/i2c/busses/i2c-designware-amdisp.c
>> index ad6f08338124..450793d5f839 100644
>> --- a/drivers/i2c/busses/i2c-designware-amdisp.c
>> +++ b/drivers/i2c/busses/i2c-designware-amdisp.c
>> @@ -8,6 +8,7 @@
>>   #include <linux/module.h>
>>   #include <linux/platform_device.h>
>>   #include <linux/pm_runtime.h>
>> +#include <linux/soc/amd/isp4_misc.h>
>>
>>   #include "i2c-designware-core.h"
>>
>> @@ -62,6 +63,7 @@ static int amd_isp_dw_i2c_plat_probe(struct platform_device *pdev)
>>
>>        adap = &isp_i2c_dev->adapter;
>>        adap->owner = THIS_MODULE;
>> +     scnprintf(adap->name, sizeof(adap->name), AMDISP_I2C_ADAP_NAME);
>>        ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev));
>>        adap->dev.of_node = pdev->dev.of_node;
>>        /* use dynamically allocated adapter id */
>> diff --git a/include/linux/soc/amd/isp4_misc.h b/include/linux/soc/amd/isp4_misc.h
>> new file mode 100644
>> index 000000000000..6738796986a7
>> --- /dev/null
>> +++ b/include/linux/soc/amd/isp4_misc.h
>> @@ -0,0 +1,12 @@
>> +// SPDX-License-Identifier: GPL-2.0+
>> +
>> +/*
>> + * Copyright (C) 2025 Advanced Micro Devices, Inc.
>> + */
>> +
>> +#ifndef __SOC_ISP4_MISC_H
>> +#define __SOC_ISP4_MISC_H
>> +
>> +#define AMDISP_I2C_ADAP_NAME "AMDISP DesignWare I2C adapter"
>> +
>> +#endif
> 
> --
> ~Randy

Re: [PATCH v2 3/3] platform/x86: Use i2c adapter name to fix build errors

[Nirujogi, Pratap]

On 6/3/2025 6:49 PM, Randy Dunlap wrote:
> Caution: This message originated from an External Source. Use proper caution when opening attachments, clicking links, or responding.
> 
> 
> On 6/3/25 2:40 PM, Pratap Nirujogi wrote:
>> Use adapater->name inplace of adapter->owner->name to fix
>> build issues when CONFIG_MODULES is not defined.
>>
>> Fixes: 90b85567e457 ("platform/x86: Add AMD ISP platform config for OV05C10")
>> Reported-by: Randy Dunlap <rdunlap@infradead.org>
>> Link: https://lore.kernel.org/all/04577a46-9add-420c-b181-29bad582026d@infradead.org
>> Signed-off-by: Pratap Nirujogi <pratap.nirujogi@amd.com>
> 
> Tested-by: Randy Dunlap <rdunlap@infradead.org>
> Thanks.
> 
Thanks Randy!

> 
>> ---
>>   drivers/platform/x86/amd/amd_isp4.c | 3 ++-
>>   1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/platform/x86/amd/amd_isp4.c b/drivers/platform/x86/amd/amd_isp4.c
>> index 0cc01441bcbb..9f291aeb35f1 100644
>> --- a/drivers/platform/x86/amd/amd_isp4.c
>> +++ b/drivers/platform/x86/amd/amd_isp4.c
>> @@ -11,6 +11,7 @@
>>   #include <linux/mutex.h>
>>   #include <linux/platform_device.h>
>>   #include <linux/property.h>
>> +#include <linux/soc/amd/isp4_misc.h>
>>   #include <linux/string.h>
>>   #include <linux/types.h>
>>   #include <linux/units.h>
>> @@ -151,7 +152,7 @@ MODULE_DEVICE_TABLE(acpi, amdisp_sensor_ids);
>>
>>   static inline bool is_isp_i2c_adapter(struct i2c_adapter *adap)
>>   {
>> -     return !strcmp(adap->owner->name, "i2c_designware_amdisp");
>> +     return !strcmp(adap->name, AMDISP_I2C_ADAP_NAME);
>>   }
>>
>>   static void instantiate_isp_i2c_client(struct amdisp_platform *isp4_platform,
> 
> --
> ~Randy