fixup! feat(core): refactor display drivers

core/embed/trezorhal/stm32f4/display/st-7789/display_driver.c

@@ -160,6 +160,14 @@ static inline void set_window(const gl_bitblt_t* bb) {
                            bb->dst_y + bb->height + 1);
 }
 
+
+// For future notice, if we ever want to do a new model using progressive rendering.
+//
+// Following functions can be optimized by using DMA (regular is likely enough) to
+// copy the data, along with the fill function. If even more performance is needed,
+// we could use double-slice similarly to double-framebuffer and render to one with DMA2D while
+// copying the other to the display with DMA.
+
 void display_fill(const gl_bitblt_t* bb) {
   set_window(bb);