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| author | Jernej Skrabec <jernej.skrabec@siol.net> | 2021-02-09 18:58:57 +0100 |
|---|---|---|
| committer | Maxime Ripard <maxime@cerno.tech> | 2021-02-10 11:19:56 +0100 |
| commit | 50791f5d7b6a14b388f46c8885f71d1b98216d1d (patch) | |
| tree | 84da1bd23227a2b8295a8b69148fa3b40f717d07 /drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h | |
| parent | 873e5bb9fbd99e4a26c448b5c7af942a6d7aa60d (diff) | |
drm/sun4i: tcon: set sync polarity for tcon1 channel
Channel 1 has polarity bits for vsync and hsync signals but driver never
sets them. It turns out that with pre-HDMI2 controllers seemingly there
is no issue if polarity is not set. However, with HDMI2 controllers
(H6) there often comes to de-synchronization due to phase shift. This
causes flickering screen. It's safe to assume that similar issues might
happen also with pre-HDMI2 controllers.
Solve issue with setting vsync and hsync polarity. Note that display
stacks with tcon top have polarity bits actually in tcon0 polarity
register.
Fixes: 9026e0d122ac ("drm: Add Allwinner A10 Display Engine support")
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Tested-by: Andre Heider <a.heider@gmail.com>
Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20210209175900.7092-3-jernej.skrabec@siol.net
Diffstat (limited to 'drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h')
0 files changed, 0 insertions, 0 deletions