Unable to set MIPI DSI display as a secondary display

[balasubramaniyam]

Hi,

I am using Linux imx-4.1.15-2.0.0_ga release and Yocto Krogoth build.

Now I'm trying to support both HDMI (primary)display and the MIPI DSI (secondary) display for iMX6-Quad.

When I set MIPI DSI as a primary display, I can able to access the HDMI(secondary).

But when I set HDMI as a primary display, MIPI DSI is failed to create the video mode.

Error log:

[ 0.516472] mxc_mipi_dsi 21e0000.mipi: i.MX MIPI DSI driver probed
[ 0.516592] MIPI DSI driver module loaded
[ 0.518934] mxc_hdmi 20e0000.hdmi_video: Detected HDMI controller 0x13:0xa:0xa0:0xc1
[ 0.518965] fbcvt: 1920x1080@60: CVT Name - 2.073M9
[ 0.519112] mxc_sdc_fb fb@0: di_pixfmt:0x33424752, bpp:0x18, di:0, ipu:0
[ 0.519126] mxc_sdc_fb fb@0: registered mxc display driver hdmi
[ 0.573565] imx-ipuv3 2400000.ipu: IPU DMFC DP HIGH RESOLUTION: 1(0,1), 5B(2~5), 5F(6,7)
[ 0.670591] Console: switching to colour frame buffer device 240x67
[ 0.720000] fbcvt: 1920x1080@60: CVT Name - 2.073M9
[ 0.720039] mxc_mipi_dsi 21e0000.mipi: failed to add videomode.
[ 0.720050] mxc_mipi_dsi 21e0000.mipi: failed to init mipi dsi lcd
[ 0.720063] mxc_sdc_fb fb@1: di_pixfmt:0x33424752, bpp:0x18, di:1, ipu:0
[ 0.720072] mxc_sdc_fb fb@1: registered mxc display driver mipi_dsi

Is it a limitation for MIPI DSI, it can access only in a primary display.

Best regards,
Bala

[balasubramaniyam]

Hi Igor,

For MIPI_DSI(Primary) + HDMI(Secondary):

    video=mxcfb0:dev=mipi_dsi,if=RGB24,bpp=24 video=mxcfb1:dev=hdmi,1920x1080M@60,if=RGB24,bpp=24

For HDMI(Primary) +MIPI_DSI(Secondary):

    video=mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24,bpp=24 video=mxcfb1:dev=mipi_dsi,if=RGB24,bpp=24

Best regards,
Bala

[igorpadykov]

Hi Bala

for MIPI_DSI(Secondary)  one can try : video=mxcfb1:dev=mipi_dsi,TRULYWVGA, if=RGB24

with Demo Images on

i.MX Software|NXP 

Best regards
igor

[balasubramaniyam]

Hi Igor,

Is MIPI DSI display is supported to connect as a secondary display?
Or it is a Limitation that we cannot connect MIPI DSI display as a secondary display?

Best regards,
Bala

[igorpadykov]

Hi Bala

one can check if correct order of kernel boot parameters are used,

look at examples in attached Release Notes p.19 for "video on 6SABRE-SD" parameter

and primary and secondary lcd parameters. May be recommended to try with NXP Demo images from

i.MX Software|NXP 

Best regards
igor
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[balasubramaniyam]

Dear igor,

By changing the display bootargs from u-boot, we can change the display parameters.

I can archive MIPI_DSI(primary) display + HDMI (secondary)

But we want to set HDMI as a primary display and MIPI_DSI as a secondary display.

Best regards,
Bala

[igorpadykov]

Hi Bala

what is your bootargs in both cases.

Best regards
igor