drm/sun4i: Initialize registers in tcon-top driver
[ Upstream commit c96d62215fb540e2ae61de44cb7caf4db50958e3 ] It turns out that TCON TOP registers in H6 SoC have non-zero reset value. This may cause issues if bits are not changed during configuration. To prevent that, initialize registers to 0. Signed-off-by: NJernej Skrabec <jernej.skrabec@siol.net> Signed-off-by: NMaxime Ripard <maxime.ripard@bootlin.com> Link: https://patchwork.freedesktop.org/patch/msgid/20181104182705.18047-24-jernej.skrabec@siol.netSigned-off-by: NSasha Levin <sashal@kernel.org>
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