Re: [PATCH 04/10] panel/auo-a030jtn01: Use refcounted allocation in place of devm_kzalloc()

["Dixit, Ashutosh" <ashutosh.dixit@intel.com>]

On Mon, 07 Apr 2025 18:40:24 -0700, Dixit, Ashutosh wrote:
>
> On Mon, 07 Apr 2025 17:18:23 -0700, Dixit, Ashutosh wrote:
> >
> > On Mon, 07 Apr 2025 16:22:40 -0700, Dixit, Ashutosh wrote:
> > >
> > > On Mon, 07 Apr 2025 08:49:23 -0700, Imre Deak wrote:
> > > >
> > > > Hi,
> > > >
> > > > On Tue, Apr 01, 2025 at 12:03:47PM -0400, Anusha Srivatsa wrote:
> > > > > Move to using the new API devm_drm_panel_alloc() to allocate the
> > > > > panel.
> > > > >
> > > > > Signed-off-by: Anusha Srivatsa <asrivats@redhat.com>
> > > > > ---
> > > > >  drivers/gpu/drm/panel/panel-auo-a030jtn01.c | 10 ++++------
> > > > >  1 file changed, 4 insertions(+), 6 deletions(-)
> > > > >
> > > > > diff --git a/drivers/gpu/drm/panel/panel-auo-a030jtn01.c b/drivers/gpu/drm/panel/panel-auo-a030jtn01.c
> > > > > index 77604d6a4e72c915c40575be0e47810c90b4ed71..83529b1c2bac2e29f41efaf4028950214b056a95 100644
> > > > > --- a/drivers/gpu/drm/panel/panel-auo-a030jtn01.c
> > > > > +++ b/drivers/gpu/drm/panel/panel-auo-a030jtn01.c
> > > > > @@ -200,9 +200,10 @@ static int a030jtn01_probe(struct spi_device *spi)
> > > > >
> > > > >	spi->mode |= SPI_MODE_3 | SPI_3WIRE;
> > > > >
> > > > > -	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> > > > > -	if (!priv)
> > > > > -		return -ENOMEM;
> > > > > +	panel = devm_drm_panel_alloc(dev, struct a030jtn01, panel,
> > > > > +				     &a030jtn01_funcs, DRM_MODE_CONNECTOR_DPI);
> > > >
> > > > This doesn't compile and (yet) it's pushed already to drm-tip. AFAIU
> > > > it's supposed to be
> > > >	priv = devm_drm_panel_alloc(...);
> > >
> > > Yes:
> > >
> > > drivers/gpu/drm/panel/panel-auo-a030jtn01.c: In function ‘a030jtn01_probe’:
> > > drivers/gpu/drm/panel/panel-auo-a030jtn01.c:203:9: error: ‘panel’ undeclared (first use in this function)
> > >   203 |         panel = devm_drm_panel_alloc(dev, struct a030jtn01, panel,
> > >       |         ^~~~~
> > > drivers/gpu/drm/panel/panel-auo-a030jtn01.c:203:9: note: each undeclared identifier is reported only once for each function it appears in
> > >
> > > Please turn on the config options for particular module if you are making
> > > changes to that module.
> >
> > Though probably, you can argue, that the pre-merge CI build should already
> > be doing this. A sort of allmodconfig for the DRM subsystem, so that these
> > kinds of issues don't get missed.
>
> More compile errors:
>
> I'm still getting some allmodconfig errors:
>
> ../drivers/gpu/drm/panel/panel-boe-th101mb31ig002-28a.c: In function 'boe_th101mb31ig002_dsi_probe':
> ../drivers/gpu/drm/panel/panel-boe-th101mb31ig002-28a.c:352:9: error: 'panel' undeclared (first use in this function)
>   352 |         panel = devm_drm_panel_alloc(dev, struct panel_desc, panel,
>       |         ^~~~~
> ../drivers/gpu/drm/panel/panel-boe-th101mb31ig002-28a.c:352:9: note: each undeclared identifier is reported only once for each function it appears in
> In file included from ../drivers/gpu/drm/panel/panel-boe-th101mb31ig002-28a.c:18:
> ../drivers/gpu/drm/panel/panel-boe-th101mb31ig002-28a.c:352:38: error: 'dev' undeclared (first use in this function); did you mean 'cdev'?
>   352 |         panel = devm_drm_panel_alloc(dev, struct panel_desc, panel,
>       |                                      ^~~
> ../include/drm/drm_panel.h:305:41: note: in definition of macro 'devm_drm_panel_alloc'
>   305 |         ((type *)__devm_drm_panel_alloc(dev, sizeof(type), \
>       |                                         ^~~
> In file included from ../include/uapi/linux/posix_types.h:5,
>                  from ../include/uapi/linux/types.h:14,
>                  from ../include/linux/types.h:6,
>                  from ../include/linux/math.h:5,
>                  from ../include/linux/delay.h:12,
>                  from ../drivers/gpu/drm/panel/panel-boe-th101mb31ig002-28a.c:8:
> ../include/linux/stddef.h:16:33: error: 'struct panel_desc' has no member named 'panel'
>    16 | #define offsetof(TYPE, MEMBER)  __builtin_offsetof(TYPE, MEMBER)
>       |                                 ^~~~~~~~~~~~~~~~~~
> ../include/drm/drm_panel.h:306:41: note: in expansion of macro 'offsetof'
>   306 |                                         offsetof(type, member), funcs, \
>       |                                         ^~~~~~~~
> ../drivers/gpu/drm/panel/panel-boe-th101mb31ig002-28a.c:352:17: note: in expansion of macro 'devm_drm_panel_alloc'
>   352 |         panel = devm_drm_panel_alloc(dev, struct panel_desc, panel,
>       |                 ^~~~~~~~~~~~~~~~~~~~
>

In case it is not clear, to reproduce and fix these, do:

	make -j$(nproc) allmodconfig


>
>
>
> >
> >
> > >
> > > >
> > > > > +	if (IS_ERR(panel))
> > > > > +		return PTR_ERR(panel);
> > > > >
> > > > >	priv->spi = spi;
> > > > >	spi_set_drvdata(spi, priv);
> > > > > @@ -223,9 +224,6 @@ static int a030jtn01_probe(struct spi_device *spi)
> > > > >	if (IS_ERR(priv->reset_gpio))
> > > > >		return dev_err_probe(dev, PTR_ERR(priv->reset_gpio), "Failed to get reset GPIO");
> > > > >
> > > > > -	drm_panel_init(&priv->panel, dev, &a030jtn01_funcs,
> > > > > -		       DRM_MODE_CONNECTOR_DPI);
> > > > > -
> > > > >	err = drm_panel_of_backlight(&priv->panel);
> > > > >	if (err)
> > > > >		return err;
> > > > >
> > > > > --
> > > > > 2.48.1
> > > > >