This is a note to let you know that I've just added the patch titled
drm/rockchip: dsi: Force synchronous probe
to the 5.4-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-rockchip-dsi-force-synchronous-probe.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 81e592f86f7afdb76d655e7fbd7803d7b8f985d8 Mon Sep 17 00:00:00 2001
From: Brian Norris <briannorris@xxxxxxxxxxxx>
Date: Wed, 19 Oct 2022 17:03:49 -0700
Subject: drm/rockchip: dsi: Force synchronous probe
From: Brian Norris <briannorris@xxxxxxxxxxxx>
commit 81e592f86f7afdb76d655e7fbd7803d7b8f985d8 upstream.
We can't safely probe a dual-DSI display asynchronously
(driver_async_probe='*' or driver_async_probe='dw-mipi-dsi-rockchip'
cmdline), because dw_mipi_dsi_rockchip_find_second() pokes one DSI
device's drvdata from the other device without any locking.
Request synchronous probe, at least until this driver learns some
appropriate locking for dual-DSI initialization.
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Brian Norris <briannorris@xxxxxxxxxxxx>
Signed-off-by: Heiko Stuebner <heiko@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20221019170255.2.I6b985b0ca372b7e35c6d9ea970b24bcb262d4fc1@changeid
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
@@ -1123,5 +1123,11 @@ struct platform_driver dw_mipi_dsi_rockc
.of_match_table = dw_mipi_dsi_rockchip_dt_ids,
.pm = &dw_mipi_dsi_rockchip_pm_ops,
.name = "dw-mipi-dsi-rockchip",
+ /*
+ * For dual-DSI display, one DSI pokes at the other DSI's
+ * drvdata in dw_mipi_dsi_rockchip_find_second(). This is not
+ * safe for asynchronous probe.
+ */
+ .probe_type = PROBE_FORCE_SYNCHRONOUS,
},
};
Patches currently in stable-queue which might be from briannorris@xxxxxxxxxxxx are
queue-5.4/drm-rockchip-dsi-force-synchronous-probe.patch
