Hey again,
I found the issue, and it has been solved by Ezequiel
before me.
A DDC I2C bus specifier is required for DDC EDID probing to work
properly.
https://www.spinics.net/lists/arm-kernel/msg708359.html
Thanks for participating in this goose-chase with me.
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: [...]
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