drm/meson: dw-hdmi: add bandgap setting for g12

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[ Upstream commit 0800103312 ]

When no mode is set, the utility pin appears to be grounded. No signal
is getting through.

This is problematic because ARC and eARC use this line and may do so even
if no display mode is set.

This change enable the bandgap setting on g12 chip, which fix the problem
with the utility pin. This is done by restoring init values on PHY init and
disable.

Fixes: 3b7c1237a7 ("drm/meson: Add G12A support for the DW-HDMI Glue")
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20240426160256.3089978-3-jbrunet@baylibre.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240426160256.3089978-3-jbrunet@baylibre.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Jerome Brunet 2024-04-26 18:02:54 +02:00 • committed by Greg Kroah-Hartman

parent f8229be8d6

commit 5a5cc5ca72

1 changed files with 26 additions and 17 deletions

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drivers/gpu/drm/meson/meson_dw_hdmi.c

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