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+--- Thread: DTS options for HDMI-DVI adapters (/showthread.php?tid=1676)
DTS options for HDMI-DVI adapters - xalius - 07-07-2016
I came across several hints on other Allwinner SoCs like the H3 (which has similar peripherals to the A64, just 32bit cores) where to enable better inter-operability with DVI-HDMI adapters a certain device tree option has to be set:
Code:
...
hdmi_hdcp_enable = <0x00000000>;
hdmi_cts_compatibility = <0x00000001>;
...http://linux-sunxi.org/Xunlong_Orange_Pi_One_%26_Lite#HDMI_to_DVI_converters (for example)
We have that option in the extracted device tree used for our Linux Images...
https://github.com/longsleep/build-pine64-image/blob/master/blobs/pine64.dts#L2003
Did anyone with DVI issues try that yet?
Edit: The dts option seems to enable "something" in the display driver, but what exactly is hidden in the binary portion if I see it correctly....
Code:
disp_hdmi.c
...
if(gdisp.init_para.hdmi_cts_compatibility == 0) {
DE_INF("bsp_disp_hdmi_open: disable dvi mode\n");
bsp_disp_hdmi_dvi_enable(screen_id, 0);
} else if(gdisp.init_para.hdmi_cts_compatibility == 1) {
DE_INF("bsp_disp_hdmi_open: enable dvi mode\n");
bsp_disp_hdmi_dvi_enable(screen_id, 1);
} else {
bsp_disp_hdmi_dvi_enable(screen_id, bsp_disp_hdmi_dvi_support(screen_id));
}
...