Am Freitag, 22. Februar 2019, 10:32:53 CET schrieb Robert Foss: > Hey again, > > I found the issue, and it has been solved by Ezequiel > before me. cool that it's working for you now. > A DDC I2C bus specifier is required for DDC EDID probing to work > properly. > > https://www.spinics.net/lists/arm-kernel/msg708359.html That patch is still sitting in my to-review queue, I should be picking it as fix for 5.1 some time this week. > Thanks for participating in this goose-chase with me. You could provide a Tested-by tag for it :-D Heiko > > > Rob. > > On 2/22/19 9:41 AM, Robert Foss wrote: > > Hey Jonas, > > > > On 2/21/19 9:29 PM, Jonas Karlman wrote: > >> On 2019-02-21 20:42, Robert Foss wrote: > >>> > >>> On 2/21/19 8:15 PM, Ezequiel Garcia wrote: > >>>> Folks, > >>>> > >>>> On Thu, 2019-02-21 at 20:08 +0100, Robert Foss wrote: > >>>> [..] > >>>> > >>>> The clock debugging is obviously good research. > >>>> > >>>>>> > >>>>>> Additionally I've had a look at the libdrm modetest util, and it is reporting > >>>>>> far fewer modes than what I would expect on my 4k monitor. > >>>>>> > >>>> That said, this is also worth looking into. > >>>> I'm curious, is the EDID the kernel getting OK? > >>>> > >>> Given that modetest lists way too few modes, I would think > >>> there could be some EDID related issues. > >> > >> It is more likely the issue is in dw_hdmi_rockchip_mode_valid(), it currently > >> filters out > >> any mode not defined in rockchip_mpll_cfg. > >> That method needs some changes to allow for 4k modes and fractal refresh rates. > >> E.g. for RK3328 it should probably check the inno-hdmi-phy clock rates. > > > > > > This seemed like a good suggetions, so I disabled the rockchip_mpll_cfg in > > dw_hdmi_rockchip_mode_valid(), and ran libdrm/modetest. I now have 5 modes. > > But no higher resolution ones, only low resolution ones that don't seem > > > > $ modetest > > [..] > > trying to open device 'rockchip'...done > > Encoders: > > id crtc type possible crtcs possible clones > > 44 34 TMDS 0x00000003 0x00000000 > > > > Connectors: > > id encoder status name size (mm) modes encoders > > 45 44 connected HDMI-A-1 0x0 5 44 > > modes: > > name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot) > > 1024x768 60 1024 1048 1184 1344 768 771 777 806 65000 flags: [..] > > 800x600 60 800 840 968 1056 600 601 605 628 40000 flags: [..] > > 800x600 56 800 824 896 1024 600 601 603 625 36000 flags: [..] > > 848x480 60 848 864 976 1088 480 486 494 517 33750 flags: [..] > > 640x480 60 640 656 752 800 480 490 492 525 25175 flags: [...] > _______________________________________________ Linux-rockchip mailing list Linux-rockchip@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/linux-rockchip
