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drm/sun4i: lvds: Invert the LVDS polarity

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The LVDS controller can invert the polarity / lanes of the LVDS output.
The default polarity causes some issues on some panels.

However, U-Boot has always used the opposite polarity without any reported
issue, and the only currently supported LVDS panel in-tree (the TBS A711)
seems to be able to work with both settings.

Let's just use the same polarity than U-Boot to be more consistent and
hopefully support all the panels.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Cc: Ondrej Jirman <megous@megous.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200704133803.37330-1-maxime@cerno.tech
This commit is contained in:
Maxime Ripard 2020-07-04 15:38:03 +02:00
parent cd6da0b113
commit 3bc46a083f
No known key found for this signature in database
GPG key ID: E3EF0D6F671851C5
1 changed files with 1 additions and 3 deletions
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4
drivers/gpu/drm/sun4i/sun4i_tcon.c
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@ -474,9 +474,7 @@ static void sun4i_tcon0_mode_set_lvds(struct sun4i_tcon *tcon,
SUN4I_TCON0_BASIC2_V_TOTAL(mode->crtc_vtotal * 2) |
SUN4I_TCON0_BASIC2_V_BACKPORCH(bp));
reg = SUN4I_TCON0_LVDS_IF_CLK_SEL_TCON0 |
SUN4I_TCON0_LVDS_IF_DATA_POL_NORMAL |
SUN4I_TCON0_LVDS_IF_CLK_POL_NORMAL;
reg = SUN4I_TCON0_LVDS_IF_CLK_SEL_TCON0;
if (sun4i_tcon_get_pixel_depth(encoder) == 24)
reg |= SUN4I_TCON0_LVDS_IF_BITWIDTH_24BITS;
else