linux-kernel - Re: [PATCH] media: i2c: imx258: correct mode to GBGB/RGRG

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Date:   Fri, 30 Oct 2020 12:32:05 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Tomasz Figa <tfiga@...omium.org>
Cc:     Sakari Ailus <sakari.ailus@...ux.intel.com>,
        "Yeh, Andy" <andy.yeh@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Jason Chen <jasonx.z.chen@...el.com>,
        Alan Chiang <alanx.chiang@...el.com>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH] media: i2c: imx258: correct mode to GBGB/RGRG

On Wed, Oct 28, 2020 at 01:08:28PM +0100, Tomasz Figa wrote:
> On Wed, Oct 28, 2020 at 11:15 AM Krzysztof Kozlowski <krzk@...nel.org> wrote:
> >
> > On Wed, 28 Oct 2020 at 11:03, Sakari Ailus <sakari.ailus@...ux.intel.com> wrote:
> > >
> > > On Wed, Oct 28, 2020 at 10:56:55AM +0100, Krzysztof Kozlowski wrote:
> > > > On Wed, 28 Oct 2020 at 10:45, Krzysztof Kozlowski <krzk@...nel.org> wrote:
> > > > >
> > > > > On Wed, 28 Oct 2020 at 10:43, Yeh, Andy <andy.yeh@...el.com> wrote:
> > > > > >
> > > > > > But the sensor settings for the original submission is to output GRBG Bayer RAW.
> > > > > >
> > > > > > Regards, Andy
> > > > >
> > > > > No, not to my knowledge. There are no settings for color output
> > > > > because it is fixed to GBGB/RGRG. I was looking a lot into this driver
> > > > > (I have few other problems with it, already few other patches posted)
> > > > > and I could not find a setting for this in datasheet. If you know the
> > > > > setting for the other color - can you point me to it?
> > > >
> > > > And except the datasheet which mentions the specific format, the
> > > > testing confirms it. With original color the pictures are pink/purple.
> > > > With proper color, the pictures are correct (with more green color as
> > > > expected for bayer).
> > >
> > > Quoting the driver's start_streaming function:
> > >
> > >         /* Set Orientation be 180 degree */
> > >         ret = imx258_write_reg(imx258, REG_MIRROR_FLIP_CONTROL,
> > >                                IMX258_REG_VALUE_08BIT, REG_CONFIG_MIRROR_FLIP);
> >
> > I understand that you think it will replace the lines and columns and
> > the first line will be RG, instead of GB.... or actually BG because it
> > flips horizontal and vertical? So why does it not work?
> 
> Any chance your SoC capture interface performs this flipping on its own as well?

I messed up GStreamer as well. The color mode is correct in the driver.

> 
> >
> > BTW, this nicely points that the comment around
> > device_property_read_u32() for rotation is a little bit misleading :)
> >
> 
> Are you referring to the comment below?
> 
> /*
> * Check that the device is mounted upside down. The driver only
> * supports a single pixel order right now.
> */
> ret = device_property_read_u32(&client->dev, "rotation", &val);
> if (ret || val != 180)
>     return -EINVAL;
> 
> What's misleading about it?

It's interpretation. To me the comment does not say that device
*have to* be mounted upside down. To me, it says that from all rotations
(90, -90, 180), it supports only upside down, except of course normal
mounting (no rotation).

Best regards,
Krzysztof