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i.MX8MQ MIPI DSI to HDMI can not show on DELL U2410 screen

Question asked by Benson Huang on Mar 27, 2018
Latest reply on Apr 9, 2018 by igorpadykov

Hi,

 

Code version: L4.9.51-beta_images_mx8mq

Distro: fsl-imx-xwayland

Machine: imx8mqevk

Image name: fsl-image-qt5-validation-imx

DTB file: imx8mq-evk-lcdif-adv7535

Platform: i.MX8MQ evk board + X-IMX-MIPI-HDMI

Screen: DELL UltraSharp U2410 (1920 x 1200 resolution)

 

When we use i.MX8MQ evk board to try converting MIPI DSI display to HDMI, we have the following questions.

1. Why does DRM select 1280x720?

[    1.706490] [drm:drm_setup_crtcs] found mode 1280x720 [    1.711557] [drm:drm_setup_crtcs] picking CRTCs for 1280x720 config [    1.717849] [drm:drm_setup_crtcs] desired mode 1280x720 set on crtc 24 (0,0) [    1.724916] [drm:drm_fbdev_cma_create_with_funcs] surface width(1280), height(720) and bpp(32) [    1.736301] nwl_dsi-imx mipi_dsi@30A00000: [drm:imx_nwl_try_phy_speed] Trying PHY ref rate: 24000000 [    1.736308] nwl_dsi-imx mipi_dsi@30A00000: [drm:imx_nwl_try_phy_speed] Trying PHY ref rate: 25000000 [    1.736313] nwl_dsi-imx mipi_dsi@30A00000: [drm:imx_nwl_try_phy_speed] Trying PHY ref rate: 27000000 [    1.736337] nwl-mipi-dsi 30a00000.mipi_dsi_bridge: [drm:nwl_dsi_bridge_mode_set] [    1.736350] [drm:drm_mode_debug_printmodeline] Modeline 0:"1280x720" 60 74250 1280 1390 1430 1650 720 725 730 750 0x40 0x5

2. Why can't our screen display the screen?

 

3. Could we modify to let our screen show? What source code do we need to modify?

 

Thanks.

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