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drm/bridge: tc358767: disable main link PHYs on main link disable

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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@pengutronix.de>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Reviewed-by: Marek Vasut <marex@denx.de>
Tested-by: Marek Vasut <marex@denx.de>
Signed-off-by: Marek Vasut <marex@denx.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20220706132812.2171250-3-l.stach@pengutronix.de
This commit is contained in:
Lucas Stach 2022-07-06 15:28:12 +02:00 committed by Marek Vasut
parent ea6490b022
commit 8759464d7b
1 changed files with 7 additions and 1 deletions
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8
drivers/gpu/drm/bridge/tc358767.c
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@ -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)