linux-kernel - Re: [PATCH v3 3/6] media: sun6i: Set 300MHz mod clock for A64

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Message-ID: <CAMty3ZBA9W0MA7BR=Cn73KbE-fSs=WXe_47c_69JpizhbsXa-g@mail.gmail.com>
Date:   Tue, 11 Dec 2018 21:20:40 +0530
From:   Jagan Teki <jagan@...rulasolutions.com>
To:     Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     Yong Deng <yong.deng@...ewell.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Chen-Yu Tsai <wens@...e.org>,
        linux-media <linux-media@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        linux-amarula@...rulasolutions.com,
        Michael Trimarchi <michael@...rulasolutions.com>
Subject: Re: [PATCH v3 3/6] media: sun6i: Set 300MHz mod clock for A64

On Tue, Dec 11, 2018 at 9:14 PM Maxime Ripard <maxime.ripard@...tlin.com> wrote:
>
> On Mon, Dec 10, 2018 at 05:22:43PM +0530, Jagan Teki wrote:
> > The default CSI_SCLK seems unable to drive the sensor to capture
> > the image, so update it to working clock rate 300MHz for A64.
> >
> > Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
> > ---
> >  drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> > diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> > index bbe45e893722..4b872800b244 100644
> > --- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> > +++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> > @@ -822,6 +822,11 @@ static int sun6i_csi_resource_request(struct sun6i_csi_dev *sdev,
> >               return PTR_ERR(sdev->clk_mod);
> >       }
> >
> > +     /* A64 need 300MHz mod clock to operate properly */
> > +     if (of_device_is_compatible(pdev->dev.of_node,
> > +                                 "allwinner,sun50i-a64-csi"))
> > +             clk_set_rate_exclusive(sdev->clk_mod, 300000000);
> > +
>
> Where is that 300MHz coming from? You claim in your comment that it

from BSP, even "Chen-Yu Tsai" mentioned the same. (Chen-Yu, can you
comment here)

> "operates properly", yet in your previous mail about this, you were
> saying that 1080p @30Hz is broken. Which one is it?

1080p is broken from sensor end, ie what I mentioned on the respective mail.