diff options
| author | Marc Zyngier <maz@kernel.org> | 2020-11-16 20:07:43 +0000 |
|---|---|---|
| committer | Neil Armstrong <narmstrong@baylibre.com> | 2020-11-17 14:47:08 +0100 |
| commit | 0405f94a1ae0586ca237aec0e859f1b796d6325d (patch) | |
| tree | 15d22260ae3f1d3ae476596745cc14d7d5857d99 /drivers/gpu/drm/meson | |
| parent | e78ad18ba3658fbc8c63629e034b68d8e51acbf1 (diff) | |
drm/meson: dw-hdmi: Register a callback to disable the regulator
Removing the meson-dw-hdmi module results in the following splat:
i[ 43.340509] WARNING: CPU: 0 PID: 572 at drivers/regulator/core.c:2125 _regulator_put.part.0+0x16c/0x174
[...]
[ 43.454870] CPU: 0 PID: 572 Comm: modprobe Tainted: G W E 5.10.0-rc4-00049-gd274813a4de3-dirty #2147
[ 43.465042] Hardware name: , BIOS 2021.01-rc2-00012-gde865f7ee1 11/16/2020
[ 43.471945] pstate: 80400009 (Nzcv daif +PAN -UAO -TCO BTYPE=--)
[ 43.477896] pc : _regulator_put.part.0+0x16c/0x174
[ 43.482638] lr : regulator_put+0x44/0x60
[...]
[ 43.568715] Call trace:
[ 43.571132] _regulator_put.part.0+0x16c/0x174
[ 43.575529] regulator_put+0x44/0x60
[ 43.579067] devm_regulator_release+0x20/0x2c
[ 43.583380] release_nodes+0x1c8/0x2b4
[ 43.587087] devres_release_all+0x44/0x6c
[ 43.591056] __device_release_driver+0x1a0/0x23c
[ 43.595626] driver_detach+0xcc/0x160
[ 43.599249] bus_remove_driver+0x68/0xe0
[ 43.603130] driver_unregister+0x3c/0x6c
[ 43.607011] platform_driver_unregister+0x20/0x2c
[ 43.611678] meson_dw_hdmi_platform_driver_exit+0x18/0x4a8 [meson_dw_hdmi]
[ 43.618485] __arm64_sys_delete_module+0x1bc/0x294
as the HDMI regulator is still enabled on release.
In order to address this, register a callback that will deal with
the disabling when the driver is unbound, solving the problem.
Fixes: 161a803fe32d ("drm/meson: dw_hdmi: Add support for an optional external 5V regulator")
Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201116200744.495826-4-maz@kernel.org
Diffstat (limited to 'drivers/gpu/drm/meson')
| -rw-r--r-- | drivers/gpu/drm/meson/meson_dw_hdmi.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/gpu/drm/meson/meson_dw_hdmi.c b/drivers/gpu/drm/meson/meson_dw_hdmi.c index 29a8ff41595d..68826cf9993f 100644 --- a/drivers/gpu/drm/meson/meson_dw_hdmi.c +++ b/drivers/gpu/drm/meson/meson_dw_hdmi.c @@ -941,6 +941,11 @@ static void meson_dw_hdmi_init(struct meson_dw_hdmi *meson_dw_hdmi) } +static void meson_disable_regulator(void *data) +{ + regulator_disable(data); +} + static int meson_dw_hdmi_bind(struct device *dev, struct device *master, void *data) { @@ -989,6 +994,10 @@ static int meson_dw_hdmi_bind(struct device *dev, struct device *master, ret = regulator_enable(meson_dw_hdmi->hdmi_supply); if (ret) return ret; + ret = devm_add_action_or_reset(dev, meson_disable_regulator, + meson_dw_hdmi->hdmi_supply); + if (ret) + return ret; } meson_dw_hdmi->hdmitx_apb = devm_reset_control_get_exclusive(dev, |