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drm/panel: Enable DSI transactions on the RPi panel.
It turns out that I had just mistaken what type of write the register writes were supposed to be, using DCS instead of generic long writes. Switching to transactions instead of using the atmel as a bridge also seems to resolve the sparkling pixels problem I've had. Signed-off-by: Eric Anholt <eric@anholt.net> Fixes: 2f733d6 ("drm/panel: Add support for the Raspberry Pi 7" Touchscreen.")
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