From: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
[ Upstream commit a7790f6bd38f3642b60ae3504a2c749135b89451 ]
The driver will reset the bridge in the atomic_pre_enable(). However
this will also drop the HPD interrupt state. Instead of resetting the
bridge, properly wake it up. This fixes the HPD interrupt delivery after
the disable/enable cycle.
Fixes: 23278bf54afe ("drm/bridge: Introduce LT9611 DSI to HDMI bridge")
Reviewed-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Signed-off-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20230118081658.2198520-3-dmitry.baryshkov@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/gpu/drm/bridge/lontium-lt9611.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/bridge/lontium-lt9611.c b/drivers/gpu/drm/bridge/lontium-lt9611.c
index 5e5641ac5ea3d..fe660d667daf6 100644
--- a/drivers/gpu/drm/bridge/lontium-lt9611.c
+++ b/drivers/gpu/drm/bridge/lontium-lt9611.c
@@ -880,12 +880,18 @@ static enum drm_mode_status lt9611_bridge_mode_valid(struct drm_bridge *bridge,
static void lt9611_bridge_pre_enable(struct drm_bridge *bridge)
{
struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
+ static const struct reg_sequence reg_cfg[] = {
+ { 0x8102, 0x12 },
+ { 0x8123, 0x40 },
+ { 0x8130, 0xea },
+ { 0x8011, 0xfa },
+ };
if (!lt9611->sleep)
return;
- lt9611_reset(lt9611);
- regmap_write(lt9611->regmap, 0x80ee, 0x01);
+ regmap_multi_reg_write(lt9611->regmap,
+ reg_cfg, ARRAY_SIZE(reg_cfg));
lt9611->sleep = false;
}
--
2.39.2
