Andoid-9 LT8912 MIPI转HDMI无输出

[liangyan]

NXP：

您好，我在使用LT-8912的驱动代码，在rel_imx_4.14.98_2.3.0z这个内核中，MIPI转HDMI是正常显示的，但是我把这个驱动移植到p9.0.0_2.0.0上，就没有图像输出了.

遇到这种现象，从那几个方面进行调查呢？

[ 1.267656] lt8912 3-0048: lt8912_probe probe done
[ 1.276462] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 1.283166] [drm] No driver support for vblank timestamp query.
[ 1.289172] imx-drm display-subsystem: bound imx-lcdif-crtc.0 (ops lcdif_crtc_ops)
[ 1.296841] imx_sec_dsim_drv 32e10000.mipi_dsi: version number is 0x1060200
[ 1.304311] imx-drm display-subsystem: bound 32e10000.mipi_dsi (ops imx_sec_dsim_ops)
[ 1.515328] random: fast init done
[ 1.517722] lt8912 3-0048: 0:"1920x1080" 60 148500 1920 2008 2052 2200 1080 1084 1089 1125 0x48 0x5
[ 1.519365] lt8912 3-0048: LT8912 ID: 12, b2
[ 1.670342] Console: switching to colour frame buffer device 240x67
[ 1.725061] imx-drm display-subsystem: fb0: frame buffer device
[ 1.731582] [drm] Initialized imx-drm 1.0.0 20120507 for display-subsystem on minor 0

[jimmychan]

You can compare the boot up log between Linux and Android.

Also, please check the bootargs setting in u-boot.

[liangyan]

hi 

I port back android-9.2.2.0 imx8mm mipi driver and LT-8912 can work。