This is a note to let you know that I've just added the patch titled drm/bridge: lt9611: fix HPD reenablement to the 6.2-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: drm-bridge-lt9611-fix-hpd-reenablement.patch and it can be found in the queue-6.2 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 4395dfde7af21d921ef18a878c2d1ebc33e20977 Author: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx> Date: Wed Jan 18 10:16:47 2023 +0200 drm/bridge: lt9611: fix HPD reenablement [ 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> diff --git a/drivers/gpu/drm/bridge/lontium-lt9611.c b/drivers/gpu/drm/bridge/lontium-lt9611.c index 2714184cc53f4..58f39b2792179 100644 --- a/drivers/gpu/drm/bridge/lontium-lt9611.c +++ b/drivers/gpu/drm/bridge/lontium-lt9611.c @@ -856,12 +856,18 @@ 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; }