On Mon, 30 Jun 2014 09:49:18 +0100
Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx> wrote:
> The problem is that the picture appears for about a second, then goes black
> for maybe a couple of seconds, then reappears for about a second and this
> cycle repeats. Rebooting into the DT kernel doesn't fix it. Rebooting
> back into the non-DT kernel does fix it. Then if you boot back into the DT
> kernel it's back again. Boot back into the non-DT kernel and it's again
> fixed.
>
> I have compared register settings for the Si5351, LCD controllers and the
> TDA998x between the non-DT and DT versions, and can find no differences
> there. Yet, DT kernels are the only kernels which exhibit this behaviour.
> Non-DT kernels (which I've run continuously including many reboots) for
> the last two years have *never* shown this problem.
>
> I have also verified that the HDMI clock is correct. The problem occurs
> at both 1080p and 720p resolutions (which are the two that are used during
> boot - I have the kernel using 720p, and Xorg uses 1080p.)
>
> I should also point out that in both cases, it is the _same_ kernel binary
> (3.15) that I'm running - the DT test case just has the DT blob attached
> whereas the non-DT case boots without (and therefore falls back to the
> old platform stuff.)
Have you declared the LCD clock in dove.dtsi?
lcdclk: fixed-clock {
compatible = "fixed-clock";
#clock-cells = <0>;
clock-frequency = <400000000>;
};
--
Ken ar c'hentañ | ** Breizh ha Linux atav! **
Jef | http://moinejf.free.fr/
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