drm/sun4i: hdmi: Document PAD_CTRL1 output invert bits
authorChen-Yu Tsai <wens@csie.org>
Sat, 14 Oct 2017 04:02:51 +0000 (12:02 +0800)
committerMaxime Ripard <maxime.ripard@free-electrons.com>
Mon, 16 Oct 2017 07:54:21 +0000 (09:54 +0200)
commit31f5232effd30808f96772f123300d9d13f0cfd1
tree040b5d6a866a90bd472ac3d8fc00b4631c6d9fe7
parent936598d16e9111e3802d45a60c028ad36a3a7013
drm/sun4i: hdmi: Document PAD_CTRL1 output invert bits

While debugging inverted color from the HDMI output on the A10, I
found that the lowest 3 bits were set. These were cleared on A20
boards that had normal display output. By manually toggling these
bits the mapping of the color components to these bits was found.

While these are not used anywhere, it would be nice to document
them somewhere.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171014040252.9621-7-wens@csie.org
drivers/gpu/drm/sun4i/sun4i_hdmi.h