On Wed, 6 Jul 2022 at 15:28, Lucas Stach <l.stach@xxxxxxxxxxxxxx> wrote: > > 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 <l.stach@xxxxxxxxxxxxxx> > --- > drivers/gpu/drm/bridge/tc358767.c | 8 +++++++- > 1 file changed, 7 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c > index fd4936215b55..615b4988bf34 100644 > --- a/drivers/gpu/drm/bridge/tc358767.c > +++ b/drivers/gpu/drm/bridge/tc358767.c > @@ -1249,7 +1249,13 @@ 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) > -- > 2.30.2 > Reviewed-by: Robert Foss <robert.foss@xxxxxxxxxx>
