From mboxrd@z Thu Jan 1 00:00:00 1970 From: Luca Ellero Date: Tue, 17 Mar 2015 11:04:56 +0100 Subject: [U-Boot] iMX6 IPU configuration by EDID Message-ID: <5507FC48.3010302@brickedbrain.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de 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 at 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. 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? Thanks Regards Luca -- Luca Ellero E-mail: luca.ellero at brickedbrain.com Internet: www.brickedbrain.com