Re: [PATCH] media: qcom: camss: vfe: fix PIX subdev naming on VFE lite

[Loic Poulain <loic.poulain@oss.qualcomm.com>]

On Tue, Mar 24, 2026 at 2:10 PM Wenmeng Liu
<wenmeng.liu@oss.qualcomm.com> wrote:
>
>
>
> On 3/23/2026 5:55 PM, Loic Poulain wrote:
> > On Mon, Mar 23, 2026 at 3:13 AM Wenmeng Liu
> > <wenmeng.liu@oss.qualcomm.com> wrote:
> >>
> >>
> >>
> >> On 3/19/2026 10:44 PM, Loic Poulain wrote:
> >>> On Thu, Mar 19, 2026 at 10:11 AM Wenmeng Liu
> >>> <wenmeng.liu@oss.qualcomm.com> wrote:
> >>>>
> >>>> VFE lite hardware does not provide a functional PIX path, but after
> >>>> the per sub-device type resource changes the PIX subdev name is still
> >>>> assigned unconditionally.
> >>>>
> >>>> Only assign the PIX subdev name on non-lite VFE variants to avoid
> >>>> exposing a misleading device name.
> >>>>
> >>>> Fixes: ae44829a4a97 ("media: qcom: camss: Add per sub-device type resources")
> >>>> Signed-off-by: Wenmeng Liu <wenmeng.liu@oss.qualcomm.com>
> >>>> ---
> >>>>    drivers/media/platform/qcom/camss/camss-vfe.c | 2 +-
> >>>>    1 file changed, 1 insertion(+), 1 deletion(-)
> >>>>
> >>>> diff --git a/drivers/media/platform/qcom/camss/camss-vfe.c b/drivers/media/platform/qcom/camss/camss-vfe.c
> >>>> index 5baf0e3d4bc461df28d8dcf97a98dec04fa17ceb..2ee4f9ae0ab50e22f916736f1d1664767bdb6a36 100644
> >>>> --- a/drivers/media/platform/qcom/camss/camss-vfe.c
> >>>> +++ b/drivers/media/platform/qcom/camss/camss-vfe.c
> >>>> @@ -2053,7 +2053,7 @@ int msm_vfe_register_entities(struct vfe_device *vfe,
> >>>>                   v4l2_subdev_init(sd, &vfe_v4l2_ops);
> >>>>                   sd->internal_ops = &vfe_v4l2_internal_ops;
> >>>>                   sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> >>>> -               if (i == VFE_LINE_PIX)
> >>>> +               if (i == VFE_LINE_PIX && vfe->res->is_lite == false)
> >>>>                           snprintf(sd->name, ARRAY_SIZE(sd->name), "%s%d_%s",
> >>>>                                    MSM_VFE_NAME, vfe->id, "pix");
> >>>
> >>> So the PIX path will be called RDI? Doesn’t that seem misleading as well?
> >> when i == VFE_LINE_PIX and vfe->res->is_lite == false then vfe name is
> >> pix, not rdi.
> >
> > I mean when is_lite==true, we're going to name the PIX(lite) path RDI,
> > whereas it's not a raw dump interface, I guess pix-lite includes minimal
> > processing engine.
>
> For VFE Lite, only RDI paths are supported. There is no PIX output.

Ah ok, understood, this is RDI3. At some point we should clean up the
code to avoid relying on statically defined RDI/PIX indices.

Regards,
Loic