From 8759464d7b6309e23df95f12064a120422d6f780 Mon Sep 17 00:00:00 2001 From: Lucas Stach Date: Wed, 6 Jul 2022 15:28:12 +0200 Subject: drm/bridge: tc358767: disable main link PHYs on main link disable Disable the main link PHYs and put them into reset when the main link is disabled. When the PHYs stay enabled while the rest of the DP link circuits are disabled there is some noise on the data lanes, which some displays try to lock onto, waking them up from their low power state. Signed-off-by: Lucas Stach Reviewed-by: Robert Foss Reviewed-by: Marek Vasut Tested-by: Marek Vasut Signed-off-by: Marek Vasut Link: https://patchwork.freedesktop.org/patch/msgid/20220706132812.2171250-3-l.stach@pengutronix.de --- drivers/gpu/drm/bridge/tc358767.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) (limited to 'drivers/gpu/drm/bridge') diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c index 2f6cb0c6902f..baaed4d37911 100644 --- a/drivers/gpu/drm/bridge/tc358767.c +++ b/drivers/gpu/drm/bridge/tc358767.c @@ -1250,7 +1250,13 @@ static int tc_main_link_disable(struct tc_data *tc) if (ret) return ret; - return regmap_write(tc->regmap, DP0CTL, 0); + ret = regmap_write(tc->regmap, DP0CTL, 0); + if (ret) + return ret; + + return regmap_update_bits(tc->regmap, DP_PHY_CTRL, + PHY_M0_RST | PHY_M1_RST | PHY_M0_EN, + PHY_M0_RST | PHY_M1_RST); } static int tc_dsi_rx_enable(struct tc_data *tc) -- cgit