[PATCH 5.19 319/717] drm/bridge: it6505: Fix the order of DP_SET_POWER commands

Greg Kroah-Hartman
2022-10-22T09:11:59Z

From: Pin-yen Lin <treapking@chromium.org>

[ Upstream commit 7c1dceaffd99247bf443606730515b54d6285969 ]

Send DP_SET_POWER_D3 command to the downstream before stopping DP, so the
suspend process will not be interrupted by the HPD interrupt. Also modify
the order in .atomic_enable callback to make the callbacks symmetric.

Fixes: 46ca7da7f1e8 ("drm/bridge: it6505: Send DPCD SET_POWER to downstream")
Signed-off-by: Pin-yen Lin <treapking@chromium.org>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220830045756.1655954-1-treapking@chromium.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/bridge/ite-it6505.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
index e5626035f311..a09d1a39ab0a 100644
--- a/drivers/gpu/drm/bridge/ite-it6505.c
+++ b/drivers/gpu/drm/bridge/ite-it6505.c
@@ -2945,9 +2945,6 @@ static void it6505_bridge_atomic_enable(struct drm_bridge *bridge,
if (ret)
dev_err(dev, "Failed to setup AVI infoframe: %d", ret);

- it6505_drm_dp_link_set_power(&it6505->aux, &it6505->link,
- DP_SET_POWER_D0);
-
it6505_update_video_parameter(it6505, mode);

ret = it6505_send_video_infoframe(it6505, &frame);
@@ -2957,6 +2954,9 @@ static void it6505_bridge_atomic_enable(struct drm_bridge *bridge,

it6505_int_mask_enable(it6505);
it6505_video_reset(it6505);
+
+ it6505_drm_dp_link_set_power(&it6505->aux, &it6505->link,
+ DP_SET_POWER_D0);
}

static void it6505_bridge_atomic_disable(struct drm_bridge *bridge,
@@ -2968,9 +2968,9 @@ static void it6505_bridge_atomic_disable(struct drm_bridge *bridge,
DRM_DEV_DEBUG_DRIVER(dev, "start");

if (it6505->powered) {
- it6505_video_disable(it6505);
it6505_drm_dp_link_set_power(&it6505->aux, &it6505->link,
DP_SET_POWER_D3);
+ it6505_video_disable(it6505);
}
}

--
2.35.1