linux-kernel - Re: [PATCH v3 05/22] media: camss: Refactor VFE HW version support

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Date:   Thu, 28 Jan 2021 11:06:56 +0100
From:   Robert Foss <robert.foss@...aro.org>
To:     Nicolas Boichat <drinkcat@...omium.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Todor Tomov <todor.too@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, shawnguo@...nel.org,
        leoyang.li@....com, Geert Uytterhoeven <geert+renesas@...der.be>,
        Arnd Bergmann <arnd@...db.de>, Anson.Huang@....com,
        michael@...le.cc, agx@...xcpu.org, max.oss.09@...il.com,
        angelogioacchino.delregno@...ainline.org,
        MSM <linux-arm-msm@...r.kernel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        AngeloGioacchino Del Regno <kholk11@...il.com>,
        Rob Herring <robh@...nel.org>,
        Andrey Konovalov <andrey.konovalov@...aro.org>,
        Tomasz Figa <tfiga@...omium.org>,
        Azam Sadiq Pasha Kapatrala Syed <akapatra@...cinc.com>,
        Sarvesh Sridutt <Sarvesh.Sridutt@...rtwirelesscompute.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Jonathan Marek <jonathan@...ek.ca>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH v3 05/22] media: camss: Refactor VFE HW version support

Hey Nicolas,

Thanks for the review!

On Thu, 28 Jan 2021 at 01:19, Nicolas Boichat <drinkcat@...omium.org> wrote:
>
> On Wed, Jan 27, 2021 at 10:56 PM Robert Foss <robert.foss@...aro.org> wrote:
> >
> > In order to support Qualcomm ISP hardware architectures that diverge
> > from older architectures, the VFE subdevice driver needs to be refactored
> > to better abstract the different ISP architectures.
> >
> > Gen1 represents the CAMSS ISP architecture. The ISP architecture developed
> > after CAMSS, Titan, will be referred to as Gen2.
> >
> > Signed-off-by: Robert Foss <robert.foss@...aro.org>
> > ---
> > [snip]
> > diff --git a/drivers/media/platform/qcom/camss/camss-vfe-4-8.c b/drivers/media/platform/qcom/camss/camss-vfe-4-8.c
> > new file mode 100644
> > index 000000000000..153e0e20664e
> > --- /dev/null
> > +++ b/drivers/media/platform/qcom/camss/camss-vfe-4-8.c
> > [snip]
> > +/*
> > + * vfe_isr - VFE module interrupt handler
> > + * @irq: Interrupt line
> > + * @dev: VFE device
> > + *
> > + * Return IRQ_HANDLED on success
> > + */
> > +static irqreturn_t vfe_isr(int irq, void *dev)
> > +{
> > +       struct vfe_device *vfe = dev;
> > +       u32 value0, value1;
> > +       int i, j;
> > +
> > +       vfe->ops->isr_read(vfe, &value0, &value1);
> > +
> > +       trace_printk("VFE: status0 = 0x%08x, status1 = 0x%08x\n",
> > +                    value0, value1);
>
> Please do not use trace_printk in production code [1,2], it is only
> meant for debug use. Consider using trace events, or dev_dbg.

Ack, this is a copy paste error, I'll add a commit fixing all
occurrences of this in the driver

>
> [1] https://elixir.bootlin.com/linux/v5.8/source/kernel/trace/trace.c#L3158
> [2] https://elixir.bootlin.com/linux/v5.8/source/include/linux/kernel.h#L766
>
> > [snip]