linux-kernel - Re: [PATCH v6 4/5] media: platform: mediatek: isp

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Message-ID: <20240731082958.GM8146@pendragon.ideasonboard.com>
Date: Wed, 31 Jul 2024 11:29:58 +0300
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: CK Hu (胡俊光) <ck.hu@...iatek.com>
Cc: "mchehab@...nel.org" <mchehab@...nel.org>,
	"conor+dt@...nel.org" <conor+dt@...nel.org>,
	"robh@...nel.org" <robh@...nel.org>,
	Andy Hsieh (謝智皓) <Andy.Hsieh@...iatek.com>,
	"jstephan@...libre.com" <jstephan@...libre.com>,
	"matthias.bgg@...il.com" <matthias.bgg@...il.com>,
	"krzk+dt@...nel.org" <krzk+dt@...nel.org>,
	"angelogioacchino.delregno@...labora.com" <angelogioacchino.delregno@...labora.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"paul.elder@...asonboard.com" <paul.elder@...asonboard.com>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
	"fsylvestre@...libre.com" <fsylvestre@...libre.com>,
	"pnguyen@...libre.com" <pnguyen@...libre.com>
Subject: Re: [PATCH v6 4/5] media: platform: mediatek: isp_30: add mediatek
 ISP3.0 camsv

Hi CK,

On Wed, Jul 31, 2024 at 02:59:51AM +0000, CK Hu (胡俊光) wrote:
> On Mon, 2024-07-29 at 16:48 +0200, Julien Stephan wrote:
> >  From: Phi-bang Nguyen <pnguyen@...libre.com>
> >
> > This driver provides a path to bypass the SoC ISP so that image data
> > coming from the SENINF can go directly into memory without any image
> > processing. This allows the use of an external ISP.
> >
> > Signed-off-by: Phi-bang Nguyen <pnguyen@...libre.com>
> > Signed-off-by: Florian Sylvestre <fsylvestre@...libre.com>
> > [Paul Elder fix irq locking]
> > Signed-off-by: Paul Elder <paul.elder@...asonboard.com>
> > Co-developed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> > Signed-off-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> > Co-developed-by: Julien Stephan <jstephan@...libre.com>
> > Signed-off-by: Julien Stephan <jstephan@...libre.com>
> > ---
> 
> [snip]
> 
> > +
> > +static void mtk_cam_cmos_vf_enable(struct mtk_cam_dev *cam_dev,
> > +   bool enable, bool pak_en)
> > +{
> > +struct device *dev = cam_dev->dev;
> > +
> > +if (pm_runtime_get_sync(dev) < 0) {
> > +dev_err(dev, "failed to get pm_runtime\n");
> > +goto out;
> > +}
> > +
> > +if (enable)
> > +cam_dev->hw_functions->mtk_cam_cmos_vf_hw_enable(cam_dev);
> 
> Directly call mtk_camsv30_cmos_vf_hw_enable().

The goal, when this was developed, was to support multiple generations
of hardware with a single driver. I think it's a worthwhile goal, but at
the same time, I'm not sure that will ever happen as I'm not aware of
plans to upstream Genio 350 and 500 support (which is a bad sad, as it's
more or less working out-of-tree). I'm thus fine either way, and if we
think the most likely outcome is that this driver will only support
Genio 300, I'm fine dropping the abstraction layer.

> > +else
> > +cam_dev->hw_functions->mtk_cam_cmos_vf_hw_disable(cam_dev);
> 
> Directly call mtk_camsv30_cmos_vf_hw_disable().
> 
> > +
> > +out:
> > +pm_runtime_put_autosuspend(dev);
> > +}
> > +

-- 
Regards,

Laurent Pinchart