Hi Laurent, On mié 06-05-2020 18:53:20, Laurent Pinchart wrote: > I didn't if I remember correctly, I just mapped it to the hardware > features. The hardware register indeed takes a value between 0 and 7, > and that is mapped to [-4,3] x t(STEP). I don't mind either option. I was taking a look at the ti-tfp410.c driver to see if it needs any changes to support the updated deskew property ranges [0-7], but I don't fully understand what this does (line 276): /* Get the setup and hold time from vendor-specific properties. */ of_property_read_u32(dvi->dev->of_node, "ti,deskew", (u32 *)&deskew); if (deskew < -4 || deskew > 3) return -EINVAL; timings->setup_time_ps = min(0, 1200 - 350 * deskew); timings->hold_time_ps = min(0, 1300 + 350 * deskew); It looks like that the driver doesn't really apply the deskew settings to the device and that this has not been really tested, so it's probably not a big deal. I guess what you wanted to do was to adjust the setup and hold times around 1200 and 1300 ps respectively in increments/decrements of 350 ps depending on the deskew value, as the datasheet describes. But this code would set timings->setup_time_ps to 0 regardless of the deskew value, and timings->hold_time_ps would be either 0 or a very big integer value if deskew is -4 (both setup_time_ps and hold_time_ps are u32). Am I missing something? Was this intentional? Thanks, Ricardo
