From: Neil Armstrong <narmstrong@baylibre.com>
To: Marc Zyngier <maz@kernel.org>, Kevin Hilman <khilman@baylibre.com>
Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
linux-amlogic@lists.infradead.org, kernel-team@android.com,
linux-arm-kernel@lists.infradead.org,
Jerome Brunet <jbrunet@baylibre.com>
Subject: Re: [PATCH 3/4] drm/meson: dw-hdmi: Register a callback to disable the regulator
Date: Tue, 17 Nov 2020 09:55:04 +0100 [thread overview]
Message-ID: <35fc622c-bebb-6111-9d08-e6b5433e75c5@baylibre.com> (raw)
In-Reply-To: <20201116200744.495826-4-maz@kernel.org>
On 16/11/2020 21:07, Marc Zyngier wrote:
> 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.
>
> Signed-off-by: Marc Zyngier <maz@kernel.org>
Fixes: 161a803fe32d ("drm/meson: dw_hdmi: Add support for an optional external 5V regulator")
> ---
> drivers/gpu/drm/meson/meson_dw_hdmi.c | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> 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,
>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
next prev parent reply other threads:[~2020-11-17 8:55 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-16 20:07 [PATCH 0/4] drm/meson: Module removal fixes Marc Zyngier
2020-11-16 20:07 ` [PATCH 1/4] drm/meson: Free RDMA resources after tearing down DRM Marc Zyngier
2020-11-17 8:51 ` Neil Armstrong
2020-11-16 20:07 ` [PATCH 2/4] drm/meson: Unbind all connectors on module removal Marc Zyngier
2020-11-17 8:53 ` Neil Armstrong
2020-11-16 20:07 ` [PATCH 3/4] drm/meson: dw-hdmi: Register a callback to disable the regulator Marc Zyngier
2020-11-17 8:55 ` Neil Armstrong [this message]
2020-11-16 20:07 ` [PATCH 4/4] drm/meson: dw-hdmi: Ensure that clocks are enabled before touching the TOP registers Marc Zyngier
2020-11-17 8:56 ` Neil Armstrong
2020-11-17 8:49 ` [PATCH 0/4] drm/meson: Module removal fixes Neil Armstrong
2020-11-17 9:19 ` Marc Zyngier
2020-11-17 9:46 ` Neil Armstrong
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=35fc622c-bebb-6111-9d08-e6b5433e75c5@baylibre.com \
--to=narmstrong@baylibre.com \
--cc=dri-devel@lists.freedesktop.org \
--cc=jbrunet@baylibre.com \
--cc=kernel-team@android.com \
--cc=khilman@baylibre.com \
--cc=linux-amlogic@lists.infradead.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=martin.blumenstingl@googlemail.com \
--cc=maz@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).