Ortustech com43h4m78ulc MIPI-DSI display problem.

[ivannikolaenko]

Hi all!

I try to integrate Ortustech com43h4m78ulc mipi-dsi display with MX6Q-SabreSD board.

I passed to kernel this command line:

console=ttymxc0,115200 root=/dev/mmcblk2p2 rootwait rw video=mxcfb0:dev=mipi_dsi,TRULY-WVGA,if=RGB24

ang got this errors while booting:

mxc_mipi_dsi 21e0000.mipi: i.MX MIPI DSI driver probed

mxc_sdc_fb fb.24: registered mxc display driver mipi_dsi

mxc_mipi_dsi 21e0000.mipi: mipi_dsi_pkt_read err:-5, data:0x0.

mxc_mipi_dsi 21e0000.mipi: MIPI DSI LCD not detected!

mxc_mipi_dsi 21e0000.mipi: failed to init mipi lcd.

mxc_sdc_fb fb.24: enable error, dispdrv:mipi_dsi.

detected fb_set_par error, error code: -22

mxc_sdc_fb fb.24: Error fb_set_var ret:-22

mxc_sdc_fb: probe of fb.24 failed with error -22

I found that error appears in mxcfb_hx8369_wvga.c file, so, I disabled HX8369_ID check, but it did not help me.

I see

mxc_mipi_dsi 21e0000.mipi: i.MX MIPI DSI driver probed

mxc_sdc_fb fb.24: registered mxc display driver mipi_dsi

without errors, but the display is still black.

[ivannikolaenko · Accepted solution]

Hi all,

The start-up sequence for controller is a hardware-dependent. So the one need to configure mxcfb_hx8369_wvga.c file accordingly to display "Power-Up sequence" which you can find in the display controller datasheet. mipi-dsi driver is a hardware-independent, no need to configure it's code.

I configured my display driver with the help of superior Ortustech techsupport, so I attached it to this message as an example.

Hope this will be helpful.

Best regards.

[maxmar]

Dear Ivan,

I am using your code for a similar display (COM40H4M66ULC). but I have some doubts. Can I ask you for some clarification ?

In the fscl kernel code there is three possible point where the display driver is called:

mipi_dsi.c

mipi_dsi_northwest.c

mipi_dsi_samsung.c

which of the three did you use?

in the structure below I did not understand how the value 37880 was obtained.

static struct fb_videomode truly_lcd_modedb[] = {
{
"TRULY-WVGA", 64, 480, 800, 37880,
8, 8,
6, 6,
8, 6,
FB_SYNC_OE_LOW_ACT,
FB_VMODE_NONINTERLACED,
0,
},
};

Best regards.

[igorpadykov]

Hi Ivan

please check lcd timings and clocks as described at

https://community.freescale.com/thread/355988

https://community.freescale.com/thread/305613

Best regards

igor

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