linux-kernel - Re: [PATCH v3 18/24] media: imx: Add SMFC subdev driver

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Date:   Wed, 1 Feb 2017 10:52:35 -0800
From:   Steve Longerbeam <slongerbeam@...il.com>
To:     Russell King - ARM Linux <linux@...linux.org.uk>
Cc:     robh+dt@...nel.org, mark.rutland@....com, shawnguo@...nel.org,
        kernel@...gutronix.de, fabio.estevam@....com, mchehab@...nel.org,
        hverkuil@...all.nl, nick@...anahar.org, markus.heiser@...marIT.de,
        p.zabel@...gutronix.de, laurent.pinchart+renesas@...asonboard.com,
        bparrot@...com, geert@...ux-m68k.org, arnd@...db.de,
        sudipm.mukherjee@...il.com, minghsiu.tsai@...iatek.com,
        tiffany.lin@...iatek.com, jean-christophe.trotin@...com,
        horms+renesas@...ge.net.au, niklas.soderlund+renesas@...natech.se,
        robert.jarzmik@...e.fr, songjun.wu@...rochip.com,
        andrew-ct.chen@...iatek.com, gregkh@...uxfoundation.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        devel@...verdev.osuosl.org,
        Steve Longerbeam <steve_longerbeam@...tor.com>
Subject: Re: [PATCH v3 18/24] media: imx: Add SMFC subdev driver



On 02/01/2017 10:39 AM, Russell King - ARM Linux wrote:
> Hi Steve,
>
> On Fri, Jan 06, 2017 at 06:11:36PM -0800, Steve Longerbeam wrote:
>> +/*
>> + * Min/Max supported width and heights.
>> + *
>> + * We allow planar output from the SMFC, so we have to align
>> + * output width by 16 pixels to meet IDMAC alignment requirements,
>> + * which also means input width must have the same alignment.
>> + */
>> +#define MIN_W       176
>> +#define MIN_H       144
>> +#define MAX_W      8192
>> +#define MAX_H      4096
>> +#define W_ALIGN    4 /* multiple of 16 pixels */
> Does this only apply to planar formats?
>
> I notice Philipp's driver allows 8 pixel alignment.  If it's only for
> planar formats, it ought to determine the alignment based on the
> requested format rather than hard-coding it to the maximum alignment
> of all the supported formats.

yeah, I got lazy/tired there. I will fix this.

Steve