I have an 4032x756 lcd I am looking to configure for the imx8m to run it.I am running u-boot 2019.04 and Linux kernel L4.19.35.
My question is how do you generate the required clock speed for a 4032x756&57Hz hdmi LCD?
Here are the screen parameters I use.
I have made the following changes at this time.
I refered to this Driving a 1080x1920 portrait HDMI screen solution.
- add below drm mode in drivers/gpu/drm/imx/hdp/imx-hdp.c
{ DRM_MODE("4032x756", DRM_MODE_TYPE_DRIVER, 148500, 4032, 4110,
4132, 4194, 0, 756, 762, 768, 774, 0,
DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC),
.vrefresh = 50, .picture_aspect_ratio = HDMI_PICTURE_ASPECT_16_9, },
2.I refered to thisCustom Resolution 800x480 - NXP Communitysolution.I find the 《HDMI-pixel clock calculation》,but I do not know how to use it.How to fill in each parameter.
The challenge I am having is what I need to add the spreadsheet for the input variables:
- Reference Clock Freq
- Expected Pixel clock
- Generated clock tolerance
- pll input divider
- pll feedback divider
- pixel clock divider
- character clock divider
Based on the above modeline should I be able to dervice these values or I need more information?
Any guidance is appreciated.
