linux-kernel - Re: [PATCH v2 2/4] media: platform: mediatek: isp

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Message-ID: <72ixohoacq4vgj7nqg4l5gt5bs5e5ewain6a5ovqs3winx3qzz@sbg5lfohq5mq>
Date:   Fri, 4 Aug 2023 16:50:05 +0200
From:   Julien Stephan <jstephan@...libre.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     Louis Kuo <louis.kuo@...iatek.com>,
        Phi-bang Nguyen <pnguyen@...libre.com>,
        Florian Sylvestre <fsylvestre@...libre.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Andy Hsieh <andy.hsieh@...iatek.com>,
        Conor Dooley <conor+dt@...nel.org>,
        daoyuan huang <daoyuan.huang@...iatek.com>,
        devicetree@...r.kernel.org,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, linux-media@...r.kernel.org,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Moudy Ho <moudy.ho@...iatek.com>,
        Rob Herring <robh+dt@...nel.org>,
        Vasily Gorbik <gor@...ux.ibm.com>
Subject: Re: [PATCH v2 2/4] media: platform: mediatek: isp_30: add mediatek
 ISP3.0 sensor interface

On Mon, Jul 03, 2023 at 01:02:02PM +0200, AngeloGioacchino Del Regno wrote:
> Il 30/06/23 12:01, Julien Stephan ha scritto:
..snip..
> > +
> > +static const struct mtk_seninf_format_info mtk_seninf_formats[] = {
> > +	{
> > +		.code = MEDIA_BUS_FMT_SBGGR8_1X8,
> > +		.flags = MTK_SENINF_FORMAT_BAYER,
>
> Each entry fits in one line.
>
> 	{ .code = MEDIA_BUS_FMT_SBGGR8_1X8, .flags = MTK_SENINF_FORMAT_BAYER },
>

Hi Angelo,

Actually not all entries fit in one line. The last 4 ones don't:

       { .code = MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8, .flags = MTK_SENINF_FORMAT_DPCM | MTK_SENINF_FORMAT_INPUT_ONLY },
which is 115 chars..

so what is the best? put all in one line except the last 4 one? or keep
them all as is?


> > +	}, {
..snip..
> > +	udelay(1);
> > +	mtk_seninf_input_update(input, SENINF_CTRL, CSI2_SW_RST, 0);
>
> Is there any way to check if the CSI port did reset, or is it *guaranteed* to get
> out of reset in a microsecond after deasserting SW_RST?
>

I will double check this

> > +}
> > +
..snip..
> > +
> > +	val = mtk_seninf_mux_read(mux, SENINF_MUX_CTRL);
>
> rst_mask = SENINF_MUX_CTRL_SENINF_IRQ_SW_RST | SENINF_MUX_CTRL_SENINF_MUX_SW_RST;
>
> writel(mux->base + SENINF_MUX_CTRL, val | rst_mask);
> writel(mux->base + SENINFMUX_CTRL, val & ~rst_mask);
>
> that's better, right? :-)
>

right :)

Cheers
Julien

> > +	mtk_seninf_mux_write(mux, SENINF_MUX_CTRL, val |
> > +			     SENINF_MUX_CTRL_SENINF_IRQ_SW_RST |
> > +			     SENINF_MUX_CTRL_SENINF_MUX_SW_RST);