drm/sun4i: fix HSYNC and VSYNC polarity
Differently from other Lcd signals, HSYNC and VSYNC signals result inverted if their bits are cleared to 0. Invert their settings of IO_POL register. Signed-off-by: NGiulio Benetti <giulio.benetti@micronovasrl.com> Signed-off-by: NMaxime Ripard <maxime.ripard@bootlin.com> Link: https://patchwork.freedesktop.org/patch/msgid/1518717288-123578-1-git-send-email-giulio.benetti@micronovasrl.com
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