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

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Date: Wed, 3 Jan 2024 23:07:34 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Randy Dunlap <rdunlap@...radead.org>
Cc: Arnd Bergmann <arnd@...nel.org>,
	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 Wed, Jan 03, 2024 at 12:06:33PM -0800, Randy Dunlap wrote:
> On 1/3/24 09:48, Laurent Pinchart wrote:
> > 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.

The alternative could save space, but I expect that to be an uncommon
use case, as FW_LOADER will likely be selected for other reasons anyway. 

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> >> ---
> >>  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

-- 
Regards,

Laurent Pinchart