07:45 <narmstrong> I thought we solved this

16:47 <xdarklight> narmstrong: I'd like to hear your opinion how to proceed with 32-bit Meson video output support. the two big things I'm missing are 1) setting the video clocks 2) making it work on boards where u-boot doesn't initialize anything (EC-100). everything else "should work" (that includes: the CVBS part of VPU, HDMI PHY, HDMI TX controller, power domains)

16:50 <xdarklight> with the video clocks I see two hard parts: 1) understanding the HDMI PLL registers (I'm confident that I have all the dividers, muxes and gates after that correct) and 2) finding out which PLL frequency to use for each video mode

16:53 <xdarklight> I have written a small tool which takes the video modes and clock settings from the vendor driver and prints them in a (mostly) human readable way: https://pastebin.com/x8pByNZH (ignore Meson6, that was just a quick experiment, the values may be completely bogus)

16:55 <xdarklight> also note that Meson8 seems to have different PLL settings compared to Meson8b and Meson8m2 (PLL on Meson8 seems to be running at half speed for some video modes). so if you look at these values I recommend you do it for Meson8b or Meson8m2

16:56 <xdarklight> actually I hope that you find some similarities in the way the video clocks are calculated compared to the newer SoCs (for example: I suspect that the rule "multiply by 10 for DMT modes" is valid for these older SoCs)

19:49 <narmstrong> xdarklight: nice data, I’ll have a look tomorrow

19:50 <narmstrong> Something you must know for Gx and later, the PHY clock is taken from the HDMI pll od1, the od2 div won’t affect the phy tmds clock

19:50 <narmstrong> I don’t know if it’s the same design on older SoCs

19:52 <narmstrong> The DMT has a fixed /10 because it’s the default ratio between the PHY tmds clock and the pixel clock

19:52 <narmstrong> It’s not explicit for the hdmi modes but it’s also here

19:52 <narmstrong> This is why I only set od0 and od1 and omit setting od2

20:53 <xdarklight> interesting

20:57 <xdarklight> in case I'm slow to respond: I'm limited to "European evening times" for the rest of the week (instead of doing nightly hacking sessions ;-) )