Hi sir
Now I would like bring up the lcdif (mipi-to-hdmi) imx8mq board, the mixel_mipi_phy_probe、adv7511_probe、nwl_dsi_probe、imx_nwl_dsi_probe run ok, all the devices attach the driver. But when it runs in linux-imx/drivers/gpu/drm/drm_fb_helper.c, it reports the error as blew:
[drm] Cannot find any crtc or sizes
Could you help me check the error?
Attachment is the detailed log, please check。
Thanks
BR
Hi Hongxing
from log: " picking CRTCs for 1280x720 config
.. drm_fb_helper_single_fb_probe: 1837: desired_mode is null.
...[drm] Cannot find any crtc or sizes"
seems there are problems with configuring panel settings with cea modes,
one can try to debug it in ..gpu/drm/drm_edid.c
Also one can use latest Linux L4.19.35_1.1.0
linux-imx - i.MX Linux kernel
and try solutions provided on Display pixel clock limitation to 74.25 MHz
Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------
Hi, igorpadykove
Thank you so much for your reply. I will try.
By the way, does the lcdif (mipi-to-hdmi) need the gpu support ? should we enable the gpu for it ?
Br
thanks
Hi Hongxing
in general gpu is not needed, display interfaces are described in
sect.13.1 Multimedia Overview i.MX8MQ Reference Manual
Best regards
igor
Hi,igor:
Thank you so much. Yes, you are right, It seems the gpu is not need. Now the fb0 create sucessfully. But when I handle the /dev/fb0 with the test demo, there is no report error, but there is no display content in the mipi-dsi panel,. attachment is the log, Could you help to check it.
Hi Hongxing
as described in sect.6.2.2 "Frame Buffer" Linux Manual from Linux 4.14.98_2.2.0 Documentation
Frame buffer drivers are supported for i.MX 6 and i.MX 7 but not for i.MX 8.
Best regards
igor