linux-kernel - Re: [PATCH 04/14] media: sun4i-csi: Fix [HV]sync polarity handling

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Message-ID: <20191216133703.4udteob37py5s3ms@gilmour.lan>
Date:   Mon, 16 Dec 2019 14:37:03 +0100
From:   Maxime Ripard <mripard@...nel.org>
To:     Chen-Yu Tsai <wens@...nel.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Chen-Yu Tsai <wens@...e.org>
Subject: Re: [PATCH 04/14] media: sun4i-csi: Fix [HV]sync polarity handling

On Mon, Dec 16, 2019 at 12:59:14AM +0800, Chen-Yu Tsai wrote:
> From: Chen-Yu Tsai <wens@...e.org>
>
> The Allwinner camera sensor interface has a different definition of
> [HV]sync. While the timing diagram uses the names HSYNC and VSYNC,
> the note following the diagram and register names use HREF and VREF.
> Combined they imply the hardware uses either [HV]REF or inverted
> [HV]SYNC. There are also registers to set horizontal skip lengths
> in pixels and vertical skip lengths in lines, also known as back
> porches.
>
> Fix the polarity handling by using the opposite polarity flag for
> the checks. Also rename `[hv]sync_pol` to `[hv]ref_pol` to better
> match the hardware register description.
>
> Fixes: 577bbf23b758 ("media: sunxi: Add A10 CSI driver")
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>

Acked-by: Maxime Ripard <mripard@...nel.org>

Thanks!
Maxime

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