On 17/03/2015 15:25, Eric Nelson wrote:
Hi Luca,
On 03/17/2015 03:04 AM, Luca Ellero wrote:
Hi all,
I'm trying to configure IPU on a iMX6 based platform by reading EDID
from the external monitor.
Everything seem to work fine except for the pixelclock. In particular my
monitor has a standard resolution of 1280x1024@60 (108 MHz pixelclock).
When the function ipu_init_sync_panel (file ipu_disp.c) is called it
correctly receive 108 MHz as pixelclock. but during the execution of
this function it gets rounded to 130 MHz.
I can see that the function calls clk_round_rate to round the clock to
130 MHz but it's not clear for me how it works.
It's been a while since I've looked at this, but I believe there's
a hidden fixed clock somewhere in the IPU driver.
http://lists.denx.de/pipermail/u-boot/2014-January/thread.html#170363
Can someone please tell me how to get the exact pixelclock I would like
to achieve? I've carefully read the iMX6 manual but it's not very useful
in this case.
Another doubt that I have regards the field "ext_clk" of parameter
"ipu_di_signal_cfg_t sig". In this case, is it better to set it or not?
I believe this is supposed to be set for HDMI, such that the IPU
clock is derived from the HDMI PHY clock and it's best to use
the Linux driver as a guide.
Hi Eric,
thank you for your reply.
I'll try to investigate the Linux driver then.
Kind regards
Luca
--
Luca Ellero
E-mail: [email protected]
Internet: www.brickedbrain.com
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