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d72d5a0ef2
shadow_framebuffer records what the panel is currently showing, but both refresh paths updated it before the refresh was confirmed, so a failed trigger or a BUSY timeout left it describing content that was never displayed. That misdescription compounds: the shadow is sent to the controller as CMD_DATA_START_OLD, so the per-pixel transitions get computed from an image the panel never held, and draw_bitmap() diffs against it, so a region matching a wrong shadow is treated as clean and never repainted. Both paths now commit only after wait_while_busy() confirms. refresh_full() also sends new data straight from the render buffer, which drops a full-framebuffer copy from the path.
GDEQ031T10 Display Driver
A kernel driver for the GoodDisplay GDEQ031T10, a 3.1" 240x320 SPI e-paper panel
(UC8253-family controller) used by the LilyGO T-Deck Pro/Max.
The command sequence (panel setting, power on/off, fast/partial LUT timings, deep
sleep) is ported from the vendor reference driver in
Xinyuan-LilyGO/T-Deck-MAX
(examples/Elink_paper/GDEQ031T10_Arduino/Display_EPD_W21.cpp).
License: Apache v2.0