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| author |   Ondrej Jirman <megous@megous.com> | 2018-02-22 17:12:17 +0100 |
|---|---|---|
| committer |   Maxime Ripard <maxime.ripard@bootlin.com> | 2018-02-26 10:12:52 +0100 |
| commit | 80b79e31c4195731464d96716f15716f38a555eb (patch) | |
| tree | e28b6a7f5ffda4ead5760aca57b11c698e2aa751 /drivers/gpu | |
| parent | drm/nouveau: prefer XBGR2101010 for addfb ioctl (diff) | |
| download | linux-dev-80b79e31c4195731464d96716f15716f38a555eb.tar.xz linux-dev-80b79e31c4195731464d96716f15716f38a555eb.zip | |
drm/sun4i: Enable the output on the pins (tcon0)
I noticed that with 4.16-rc1 LVDS output on A83T based TBS A711 tablet doesn't
work (there's output but it's garbled). I compared some older patches for LVDS
support with the mainlined ones and this change is missing from mainline Linux.
I don't know what the register does exactly and the harcoded register value
doesn't inspire much confidence that it will work in a general case, so I'm
sending this RFC.
This patch fixes the issue on A83T.
Signed-off-by: Ondrej Jirman <megous@megous.com>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180222161217.23904-1-megous@megous.com
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/sun4i/sun4i_tcon.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c index 3c15cf24b503..51740ddb4b32 100644 --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c @@ -335,6 +335,9 @@ static void sun4i_tcon0_mode_set_lvds(struct sun4i_tcon *tcon, regmap_update_bits(tcon->regs, SUN4I_TCON_GCTL_REG, SUN4I_TCON_GCTL_IOMAP_MASK, SUN4I_TCON_GCTL_IOMAP_TCON0); + + /* Enable the output on the pins */ + regmap_write(tcon->regs, SUN4I_TCON0_IO_TRI_REG, 0xe0000000); } static void sun4i_tcon0_mode_set_rgb(struct sun4i_tcon *tcon, |