linux-kernel - Re: [PATCH v4 33/36] media: imx: redo pixel format enumeration and negotiation

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Message-ID: <1487244744.2377.38.camel@pengutronix.de>
Date:   Thu, 16 Feb 2017 12:32:24 +0100
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Steve Longerbeam <slongerbeam@...il.com>
Cc:     robh+dt@...nel.org, mark.rutland@....com, shawnguo@...nel.org,
        kernel@...gutronix.de, fabio.estevam@....com,
        linux@...linux.org.uk, mchehab@...nel.org, hverkuil@...all.nl,
        nick@...anahar.org, markus.heiser@...marIT.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, shuah@...nel.org,
        sakari.ailus@...ux.intel.com, pavel@....cz,
        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 v4 33/36] media: imx: redo pixel format enumeration and
 negotiation

On Wed, 2017-02-15 at 18:19 -0800, Steve Longerbeam wrote:
> The previous API and negotiation of mbus codes and pixel formats
> was broken, and has been completely redone.
> 
> The negotiation of media bus codes should be as follows:
> 
> CSI:
> 
> sink pad     direct src pad      IDMAC src pad
> --------     ----------------    -------------
> RGB (any)        IPU RGB           RGB (any)
> YUV (any)        IPU YUV           YUV (any)
> Bayer              N/A             must be same bayer code as sink

The IDMAC src pad should also use the internal 32-bit RGB / YUV format,
except if bayer/raw mode is selected, in which case the attached capture
video device should only allow a single mode corresponding to the output
pad media bus format.

regards
Philipp