https://github.com/torvalds/linux
Revision 4396393fb96449c56423fb4b351f76e45a6bcaf6 authored by Chen-Yu Tsai on 07 January 2020, 07:01:13 UTC, committed by Maxime Ripard on 07 January 2020, 14:56:40 UTC
In commit 0b8e7bbde5e7 ("drm/sun4i: tcon: Set min division of TCON0_DCLK
to 1.") it was assumed that all TCON variants support a minimum divider
of 1 if only DCLK was used.
However, the oldest generation of hardware only supports minimum divider
of 4 if only DCLK is used. If a divider of 1 was used on this old
hardware, some scrolling artifact would appear. A divider of 2 seemed
OK, but a divider of 3 had artifacts as well.
Set the minimum divider when outputing to parallel RGB based on the
hardware model, with a minimum of 4 for the oldest (A10/A10s/A13/A20)
hardware, and a minimum of 1 for the rest. A value is not set for the
TCON variants lacking channel 0.
This fixes the scrolling artifacts seen on my A13 tablet.
Fixes: 0b8e7bbde5e7 ("drm/sun4i: tcon: Set min division of TCON0_DCLK to 1.")
Cc: <stable@vger.kernel.org> # 5.4.x
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20200107070113.28951-1-wens@kernel.org
1 parent c4e4fcc
Tip revision: 4396393fb96449c56423fb4b351f76e45a6bcaf6 authored by Chen-Yu Tsai on 07 January 2020, 07:01:13 UTC
drm/sun4i: tcon: Set RGB DCLK min. divider based on hardware model
drm/sun4i: tcon: Set RGB DCLK min. divider based on hardware model
Tip revision: 4396393
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