This is a note to let you know that I've just added the patch titled
drm/meson: Don't remove bridges which are created by other drivers
to the 6.6-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-meson-don-t-remove-bridges-which-are-created-by-other-drivers.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From bd915ae73a2d78559b376ad2caf5e4ef51de2455 Mon Sep 17 00:00:00 2001
From: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
Date: Thu, 15 Feb 2024 23:04:42 +0100
Subject: drm/meson: Don't remove bridges which are created by other drivers
From: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
commit bd915ae73a2d78559b376ad2caf5e4ef51de2455 upstream.
Stop calling drm_bridge_remove() for bridges allocated/managed by other
drivers in the remove paths of meson_encoder_{cvbs,dsi,hdmi}.
drm_bridge_remove() unregisters the bridge so it cannot be used
anymore. Doing so for bridges we don't own can lead to the video
pipeline not being able to come up after -EPROBE_DEFER of the VPU
because we're unregistering a bridge that's managed by another driver.
The other driver doesn't know that we have unregistered it's bridge
and on subsequent .probe() we're not able to find those bridges anymore
(since nobody re-creates them).
This fixes probe errors on Meson8b boards with the CVBS outputs enabled.
Fixes: 09847723c12f ("drm/meson: remove drm bridges at aggregate driver unbind time")
Fixes: 42dcf15f901c ("drm/meson: add DSI encoder")
Cc: <stable@xxxxxxxxxxxxxxx>
Reported-by: Steve Morvai <stevemorvai@xxxxxxxxxxx>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
Reviewed-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
Tested-by: Steve Morvai <stevemorvai@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240215220442.1343152-1-martin.blumenstingl@xxxxxxxxxxxxxx
Reviewed-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
Signed-off-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20240215220442.1343152-1-martin.blumenstingl@xxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/meson/meson_encoder_cvbs.c | 1 -
drivers/gpu/drm/meson/meson_encoder_dsi.c | 1 -
drivers/gpu/drm/meson/meson_encoder_hdmi.c | 1 -
3 files changed, 3 deletions(-)
--- a/drivers/gpu/drm/meson/meson_encoder_cvbs.c
+++ b/drivers/gpu/drm/meson/meson_encoder_cvbs.c
@@ -294,6 +294,5 @@ void meson_encoder_cvbs_remove(struct me
if (priv->encoders[MESON_ENC_CVBS]) {
meson_encoder_cvbs = priv->encoders[MESON_ENC_CVBS];
drm_bridge_remove(&meson_encoder_cvbs->bridge);
- drm_bridge_remove(meson_encoder_cvbs->next_bridge);
}
}
--- a/drivers/gpu/drm/meson/meson_encoder_dsi.c
+++ b/drivers/gpu/drm/meson/meson_encoder_dsi.c
@@ -168,6 +168,5 @@ void meson_encoder_dsi_remove(struct mes
if (priv->encoders[MESON_ENC_DSI]) {
meson_encoder_dsi = priv->encoders[MESON_ENC_DSI];
drm_bridge_remove(&meson_encoder_dsi->bridge);
- drm_bridge_remove(meson_encoder_dsi->next_bridge);
}
}
--- a/drivers/gpu/drm/meson/meson_encoder_hdmi.c
+++ b/drivers/gpu/drm/meson/meson_encoder_hdmi.c
@@ -474,6 +474,5 @@ void meson_encoder_hdmi_remove(struct me
if (priv->encoders[MESON_ENC_HDMI]) {
meson_encoder_hdmi = priv->encoders[MESON_ENC_HDMI];
drm_bridge_remove(&meson_encoder_hdmi->bridge);
- drm_bridge_remove(meson_encoder_hdmi->next_bridge);
}
}
Patches currently in stable-queue which might be from martin.blumenstingl@xxxxxxxxxxxxxx are
queue-6.6/regulator-pwm-regulator-add-validity-checks-in-conti.patch
queue-6.6/drm-meson-don-t-remove-bridges-which-are-created-by-other-drivers.patch
