Re: Help configuring i.MX6 IPUv3 with a parrallel display

From: Philippe Leduc <ledphilippe@gmail.com>
To: Sascha Hauer <s.hauer@pengutronix.de>
Cc: barebox@lists.infradead.org
Subject: Re: Help configuring i.MX6 IPUv3 with a parrallel display
Date: Wed, 24 Feb 2016 13:39:25 +0100	[thread overview]
Message-ID: <CABQt-UnC4FvOPwkHJ8UtefBDLkc65nTr7hVSJ6vPgBYASWAS5w@mail.gmail.com> (raw)
In-Reply-To: <20160224111516.GM3939@pengutronix.de>

> You could try setting it to
V4L2_PIX_FMT_RGB24 manually in ipu_crtc_mode_set().
It is working with this trick and I do not get any error:

Unfortunately, the display stay white... I tried to write it with "mw
-d /dev/fb0 0xXXXXXXXX +0x40000" and splash freeze the board.

Note: the LCD is whiter with fb0.enable=1 so something's happening


Philippe LEDUC
ledphilippe@gmail.com


2016-02-24 12:15 GMT+01:00 Sascha Hauer <s.hauer@pengutronix.de>:
> On Wed, Feb 24, 2016 at 09:22:40AM +0100, Philippe Leduc wrote:
>> Hi,
>>
>> Since I do not manage to get a splashscreen with the simple-panel
>> driver, I tried the other way: adding a driver for
>> imx-parrallel-display that exposes the display-timings. So far I
>> managed to add a video mode to my framebuffer:
>>
>> devinfo fb0
>> Resources:
>>   num: 0
>>   start: 0x2005a000
>>   size: 0x0007f800
>> Available modes:
>>   rk043fn07h: 480x272@0
>> Parameters:
>>   enable: 0
>>   mode_name: rk043fn07h
>>   shadowfb: 1
>>
>> But there is no refresh rate? Don't know if it is a problem, but my
>> framebuffer still doesn't want to work (however it is more or less
>> better than before):
>
> The refresh rate is 0 because the code in of_display_timing.c doesn't
> set the refresh rate. That's not nice, but shouldn't be a problem.
>
>>
>> fb0.enable=1
>> imx-ipuv3-crtc imx-ipuv3-crtc0: ipu_crtc_mode_set: mode->xres: 480
>> imx-ipuv3-crtc imx-ipuv3-crtc0: ipu_crtc_mode_set: mode->yres: 272
>> imx-ipuv3-crtc imx-ipuv3-crtc0: initializing display controller failed with -22
>
> The only way ipu_dc_init_sync() fails is when interface_pix_fmt is
> invalid. This means you either have no "interface-pix-fmt" property or
> this property doesn't get evaluated. You could try setting it to
> V4L2_PIX_FMT_RGB24 manually in ipu_crtc_mode_set().
>
> Sascha
>
>
> --
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