From: Adam Ford <aford173@gmail.com>
To: dri-devel@lists.freedesktop.org
Cc: aford@beaconembedded.com, laurent.pinchart@ideasonboard.com,
Adam Ford <aford173@gmail.com>, Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Conor Dooley <conor+dt@kernel.org>,
Shawn Guo <shawnguo@kernel.org>,
Sascha Hauer <s.hauer@pengutronix.de>,
Pengutronix Kernel Team <kernel@pengutronix.de>,
Fabio Estevam <festevam@gmail.com>,
Andrzej Hajda <andrzej.hajda@intel.com>,
Neil Armstrong <neil.armstrong@linaro.org>,
Robert Foss <rfoss@kernel.org>,
Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
Jonas Karlman <jonas@kwiboo.se>,
Jernej Skrabec <jernej.skrabec@gmail.com>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <mripard@kernel.org>,
Thomas Zimmermann <tzimmermann@suse.de>,
David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>,
devicetree@vger.kernel.org, imx@lists.linux.dev,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: [PATCH V2 1/2] drm/bridge: adv7511: Allow IRQ to share GPIO pins
Date: Mon, 4 Mar 2024 18:48:57 -0600 [thread overview]
Message-ID: <20240305004859.201085-1-aford173@gmail.com> (raw)
The IRQ registration currently assumes that the GPIO is dedicated
to it, but that may not necessarily be the case. If the board has
another device sharing the GPIO, it won't be registered and the
hot-plug detect fails to function.
Currently, the handler reads two registers and blindly
assumes one of them caused the interrupt and returns IRQ_HANDLED
unless there is an error. In order to properly do this, the IRQ
handler needs to check if it needs to handle the IRQ and return
IRQ_NONE if there is nothing to handle. With the check added
and the return code properly indicating whether or not it there
was an IRQ, the IRQF_SHARED can be set to share a GPIO IRQ.
Signed-off-by: Adam Ford <aford173@gmail.com>
---
V2: Add check to see if there is IRQ data to handle
diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
index b5518ff97165..f3b4616a8fb6 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
+++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
@@ -477,6 +477,11 @@ static int adv7511_irq_process(struct adv7511 *adv7511, bool process_hpd)
if (ret < 0)
return ret;
+ /* If there is no IRQ to handle, exit indicating no IRQ data */
+ if (!(irq0 & (ADV7511_INT0_HPD | ADV7511_INT0_EDID_READY)) &&
+ !(irq1 & ADV7511_INT1_DDC_ERROR))
+ return -ENODATA;
+
regmap_write(adv7511->regmap, ADV7511_REG_INT(0), irq0);
regmap_write(adv7511->regmap, ADV7511_REG_INT(1), irq1);
@@ -1318,7 +1323,8 @@ static int adv7511_probe(struct i2c_client *i2c)
ret = devm_request_threaded_irq(dev, i2c->irq, NULL,
adv7511_irq_handler,
- IRQF_ONESHOT, dev_name(dev),
+ IRQF_ONESHOT | IRQF_SHARED,
+ dev_name(dev),
adv7511);
if (ret)
goto err_unregister_audio;
--
2.43.0
next reply other threads:[~2024-03-05 0:49 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-05 0:48 Adam Ford [this message]
2024-03-05 0:48 ` [PATCH V2 2/2] arm64: dts: imx8mp-beacon-kit: Enable HDMI bridge HPD Adam Ford
2024-04-16 21:18 ` Adam Ford
2024-05-13 12:24 ` Adam Ford
2024-03-05 8:18 ` [PATCH V2 1/2] drm/bridge: adv7511: Allow IRQ to share GPIO pins Laurent Pinchart
2024-04-04 12:00 ` Adam Ford
2024-04-04 12:23 ` Dmitry Baryshkov
2024-04-04 12:30 ` (subset) " Dmitry Baryshkov
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=20240305004859.201085-1-aford173@gmail.com \
--to=aford173@gmail.com \
--cc=aford@beaconembedded.com \
--cc=airlied@gmail.com \
--cc=andrzej.hajda@intel.com \
--cc=conor+dt@kernel.org \
--cc=daniel@ffwll.ch \
--cc=devicetree@vger.kernel.org \
--cc=dri-devel@lists.freedesktop.org \
--cc=festevam@gmail.com \
--cc=imx@lists.linux.dev \
--cc=jernej.skrabec@gmail.com \
--cc=jonas@kwiboo.se \
--cc=kernel@pengutronix.de \
--cc=krzysztof.kozlowski+dt@linaro.org \
--cc=laurent.pinchart@ideasonboard.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=maarten.lankhorst@linux.intel.com \
--cc=mripard@kernel.org \
--cc=neil.armstrong@linaro.org \
--cc=rfoss@kernel.org \
--cc=robh@kernel.org \
--cc=s.hauer@pengutronix.de \
--cc=shawnguo@kernel.org \
--cc=tzimmermann@suse.de \
/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 read-only IMAP folder(s) and NNTP newsgroup(s).