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drm/rockchip: dsi: Force synchronous probe

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commit 81e592f86f 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@vger.kernel.org>
Signed-off-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20221019170255.2.I6b985b0ca372b7e35c6d9ea970b24bcb262d4fc1@changeid
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Brian Norris
2022-10-19 17:03:49 -07:00
committed by Greg Kroah-Hartman
parent 23f1fc7ce5
commit 9f3b867808
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
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@@ -1286,5 +1286,11 @@ struct platform_driver dw_mipi_dsi_rockchip_driver = {
.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,
},
};