linux-kernel - Re: [RFC PATCH 1/3] atmel-hlcdc: add support for 8-bit color lookup table mode

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Message-ID: <bb3e2366-214d-d2cb-4dab-6d197e5f752f@axentia.se>
Date:   Sat, 17 Jun 2017 00:25:57 +0200
From:   Peter Rosin <peda@...ntia.se>
To:     Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:     linux-kernel@...r.kernel.org, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Sean Paul <seanpaul@...omium.org>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [RFC PATCH 1/3] atmel-hlcdc: add support for 8-bit color lookup
 table mode

On 2017-06-16 23:12, Peter Rosin wrote:
> On 2017-06-16 18:15, Boris Brezillon wrote:
>> To be very clear, I'd like you to test it through DRM ioctls, not only
>> through the fbdev emulation layer.
> 
> ...so yeah, right, I couldn't agree more. Any pointers to code w/o a bunch
> of complex library dependencies that I can test with?

I have now built libdrm-2.4.81, and get this:

$ modetest -M atmel-hlcdc -s 27@39:1024x768
setting mode 1024x768-60Hz@...4 on connectors 27, crtc 39
$ modetest -M atmel-hlcdc -s 27@39:1024x768@...6
setting mode 1024x768-60Hz@...6 on connectors 27, crtc 39
$ modetest -M atmel-hlcdc -s 27@39:1024x768@C8
unknown format C8
<usage>

(output on the lcd looks sane for the first two, not that I really
know exactly what to expect)

Looking at the libdrm code, I only find YUV and RGB modes in
tests/util/format.c which make me less confident that I will find
something sane to test with.

So, pointers to code to test with desperately needed...

Cheers,
peda