The EPDC_STANDARD_MODE is defined In the file of imx7d_epdc_v2_fb.c.
what's the feature in this mode ?
The EPD function can be separated into two major asynchronous processes. The first isthe front end portion which is responsible for processing display updates. The second isthe function of driving waveforms to the TFT panel in order to update the screen contents(the refresh operation).
With the EPDC_STANDARD MODE you are selecting the Waveform mode. The EPDC provides a mechanism through its histogram analysis feature (which can be run as part of any frame/region processing operations)to allow the SW driver to characterize the region/buffer in terms of gray-map content.
For example, EPDC can determine if the update region (considering only those pixels undergoing a transition) contains only 2, 4, 8 or 16 gray levels, HW can automatically select waveform mode according to a programmed LUT holdingmapping between grey level and waveform mode. SW driver can also manuallychoose the appropriate waveform update mode (e.g., when doing an update to repairghosting artifacts).
If you want to see further details please refer to section 188.8.131.52.2 Panel Architecture Configuration of the i.MX7D Reference Manual.
Have a nice day!
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