linux-kernel - Re: [PATCH] media: i2c: thp7312: select CONFIG_FW

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Date: Wed, 3 Jan 2024 12:06:33 -0800
From: Randy Dunlap <rdunlap@...radead.org>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Arnd Bergmann <arnd@...nel.org>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
 Paul Elder <paul.elder@...asonboard.com>,
 Hans Verkuil <hverkuil-cisco@...all.nl>,
 Sakari Ailus <sakari.ailus@...ux.intel.com>, Arnd Bergmann <arnd@...db.de>,
 Hans de Goede <hdegoede@...hat.com>,
 Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
 Alain Volmat <alain.volmat@...s.st.com>,
 Mehdi Djait <mehdi.djait@...tlin.com>, linux-media@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: i2c: thp7312: select CONFIG_FW_LOADER



On 1/3/24 09:48, Laurent Pinchart wrote:
> Hi Arnd,
> 
> Thank you for the patch.
> 
> On Wed, Jan 03, 2024 at 04:58:05PM +0100, Arnd Bergmann wrote:
>> From: Arnd Bergmann <arnd@...db.de>
>>
>> The recently added driver uses the firmware loader mechanism but causes
>> a link failure when that is in a loadable module while thp7312 itself
>> is built-in:
>>
>> arm-linux-gnueabi-ld: drivers/media/i2c/thp7312.o: in function `thp7312_probe':
>> thp7312.c:(.text+0x4164): undefined reference to `firmware_upload_register'
>>
>> Select the required Kconfig symbol. Note that the driver specifically
>> needs the firmware upload interface that is controlled by CONFIG_FW_UPLOAD,
>> but there is no link failure when that is disabled because the interfaces
>> are stubbed out here.
>>
>> Fixes: 7a52ab415b43 ("media: i2c: Add driver for THine THP7312")
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> 
> I've posted a similar fix yesterday, see
> https://lore.kernel.org/linux-media/20240102074518.24968-1-laurent.pinchart@ideasonboard.com
> 
> What approach do you think is best ?

By far the dominant use of FW_LOADER is to select it instead of depend on it,
so I prefer Arnd's patch.

> 
>> ---
>>  drivers/media/i2c/Kconfig | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
>> index 78a87331686e..4c3435921f19 100644
>> --- a/drivers/media/i2c/Kconfig
>> +++ b/drivers/media/i2c/Kconfig
>> @@ -674,6 +674,7 @@ menu "Camera ISPs"
>>  config VIDEO_THP7312
>>  	tristate "THine THP7312 support"
>>  	depends on I2C
>> +	select FW_LOADER
>>  	select MEDIA_CONTROLLER
>>  	select V4L2_CCI_I2C
>>  	select V4L2_FWNODE
> 

-- 
#Randy