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Imx6 Framerate with LVDS split-mode

Question asked by Shuyu Chou on May 11, 2016
Latest reply on Aug 31, 2017 by Ankit Patel

Hi,

I have 1920x1200 LVDS panel and add "split-mode" in dtsi of i.mx6.

There's cts refreshrate failed on "  android.view.cts.DisplayRefreshRateTest -- testRefreshRate" , the freshrate is only 32 fps.

 

I do the same test in imx6 bsp and ev board

The followings are test results of testRefreshRate on IMX6 evb:

 

Claimed fps

Average Achieve fps

evb Imx6Q ( wsithout split-mode)

  1. 60.000004  fps

59 fps

evb Imx6Q (with split-mode)

  1. 60.000004  fps

34 fps

 

Does anyone know how to resolve this problems ?

Is any limitation of  split-mode with resolution on IMX6?

 

Test info :

Image: Android 6.0. I.MX6 Q(download from NXP i.MX 6 Series Software and Development Tool Resource)

CPU : iMX6Q

EVB info : IMX6 Series SABRE for Smart Devices (detail info)

 

 

evb Imx6Q   split-mode  setting :

kernel_imx_/arch/arm/boot/dts/Imx6qdl-sabresd.dtsi

.....

&ldb {

    status = "okay";

    split-mode;

    lvds-channel@0 {

fsl,data-mapping = "spwg";

fsl,data-width = <18>;

            status = "okay";

 

display-timings {

native-mode = <&timing0>;

timing0: hsd100pxn1 {

 

clock-frequency = <65000000>;

hactive = <1024>;

vactive = <768>;

hback-porch = <220>;

  hfront-porch = <40>;

vback-porch = <21>;

vfront-porch = <7>;

hsync-len = <60>;

vsync-len = <10>;

};

};

    };

 

Thanks,

shuyu

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