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iMX8QM eDP Support

Question asked by prashanth kumar on Sep 10, 2019
Latest reply on Sep 10, 2019 by igorpadykov

Hi,

 

In iMX8QM custom board with 4.14.98 Kernel BSP, we are trying to configure "eDP" support (1366x768 resolution) using DP(Display Port) signal. But the display is not getting up. Also EDID read for eDP is failing.
With the same setup the DP is working properly for 4K@60fps.

 

The kernel Device tree content for eDP/DP as follows,
---------------------------------------------------------------------

&hdmi {
compatible = "fsl,imx8qm-dp";
assigned-clocks = <&clk IMX8QM_HDMI_PXL_SEL>,
<&clk IMX8QM_HDMI_PXL_LINK_SEL>,
<&clk IMX8QM_HDMI_PXL_MUX_SEL>;
assigned-clock-parents = <&clk IMX8QM_HDMI_AV_PLL_CLK>,
<&clk IMX8QM_HDMI_AV_PLL_CLK>,
<&clk IMX8QM_HDMI_AV_PLL_CLK>;
dp-lane-mapping = <0x1b>;
dp-link-rate = <0x14>;
dp-num-lanes = <0x4>;
fsl,edp;
status = "okay";
};

 

The driver for eDP/DP support using is,

drivers/gpu/drm/imx/hdp/imx-hdp.c

drivers/gpu/drm/imx/hdp/imx-dp.c

The eDP Datasheet which we are using is attached for your reference.
Is the above DTS configuration is proper? Kindly do the valuable support to resolve the issue.

 

Thanks in advance.

Best Regards,

Prashanth Kumar K

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