From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f177.google.com (mail-pl1-f177.google.com [209.85.214.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3217984FD4; Thu, 4 Apr 2024 12:01:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.177 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712232063; cv=none; b=G0ZIoQ+oSiyiY1K7KNxIRNlh28ujIAgX9GEEyNDIL2mwa2IbRBrcBkjEQsQag7LnEaoxO+83e1ARsG++qtpDfs36hRZi01mmed/Vq7siIh2Z8cngi/iTCDR1x7Huy2qkNjKtwzou0xHCb8m5X3y87MBBElVICYe813+aapd8Rhc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712232063; c=relaxed/simple; bh=Aqeqvw4GrvT18e980JUpO21rtv2qBW15mhfK8EzHsvM=; h=MIME-Version:References:In-Reply-To:From:Date:Message-ID:Subject: To:Cc:Content-Type; b=Na70TxuYkDB65Z8YXOh3vy92mefAWhEj5//XqXSqj9GsXYtBhPVYw1EPzlMDCjvH8mK0kABP+cbVKu8pT6cJT9f0xYDMLZ5G1ycMcTTcVa9QN2SQd+J+gC+bpVukooMYf8+Tpe+yGLqSHKgnGZpE6fC7N2gwpCFdKOMTIL0NVU8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=FOGF+/Zn; arc=none smtp.client-ip=209.85.214.177 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="FOGF+/Zn" Received: by mail-pl1-f177.google.com with SMTP id d9443c01a7336-1e2178b2cf2so7866425ad.0; Thu, 04 Apr 2024 05:01:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1712232061; x=1712836861; darn=vger.kernel.org; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=wL4i2rxVSO4Dx2Z9A/DMCu9nioCZUVI1YGXCUgVZyec=; b=FOGF+/ZnEOR3ylocD/3UAgQUSu5k4swk5sdbNcjNvN15GsLjR09ummw3pEQm6lf6st E9K5y2x53vH5VseLux3zfbz8ewsXkyY3sAlz9Qx8BPedJDJE0w0fklwvpsYU+FjZcu8a pFBRhDo/GOEys99km8ZP8/NnqMn6Ar150eHs2rSNOI9kC2+0A0cE+H5V4w+pvCXUVMv1 mW3fzRGGjUjNQhbzftFOKij8CrUbJ4imJ9k742VUcvqg+/DAsHFulDXeaFrchfylyY6H OlBgQnpCiSO8oxT0W0v/M1+NxcJtc1cJxV+KiexsRJf5bK0hH9XdOw2zbacUF/YhoTnF bWbw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1712232061; x=1712836861; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=wL4i2rxVSO4Dx2Z9A/DMCu9nioCZUVI1YGXCUgVZyec=; b=TYmOJQmWmy1GgZvqQMql+t1Zl4XQjacTAc9hyuflmo1Mu4lyhFmi2q7wV01fwOLgHX 1DOySzUwZPh/NSZYNRtpyTVpnT9VXK+YjZryEii8V6vJyi4EuCYQdl6TgHkSK6HHNGDW YrOvW2xBKOo1zBsjooaEMwvBHXie30HjQbNZeELEEsZZNlH4H6YmMMWEkJNSem7k6gSM +dHrnArJmLk6mX97CtGrhqr1c2IJuTLjdv+VX3Wao5TPY6KUjpntiXFkAOEBgsKqnvL+ MY14zD9bG+2GcrLmL8By3vq05WPyoN2pIxZQ/tmDGfkoUFPhz5104H3zZfo1oR46LG2c URbw== X-Forwarded-Encrypted: i=1; AJvYcCWCX6PuDHXSUP8379vjf0UUre12hLJC42HbA7JvmXevafjs1fDz8RkzOFAJ+Vzvjrk2l3DeMSnzFdl/oTRDxgsANV+ZlVPHlgtZPkmHZFV9xfGIKI1TNa6SZ4SlHObmWsLHIvBhlVwWjw== X-Gm-Message-State: AOJu0YxZbdeZ4Ip5cZa33mm5ByHg96OVR3BAhdPm2WIeIT4UN7LUkRgz 3PBOhn5KOqkqy/qrsWkYffSokNCyiMBwTqfIzSxckjrlCnbY80f2N7y7vRSQCsRQTMdyJd1eSmQ ZKvnV+ke5M8Wp81jmGc5riEc0yZw= X-Google-Smtp-Source: AGHT+IGcM7phzQ4a6LWlb+ZbUy46QOrWqPtD6hZ2VF2T8uxuZk2nkBNtUNgHlEIleOyY0tflROY1ahFFF1Z2hTRU4SA= X-Received: by 2002:a17:902:7282:b0:1e2:7356:aa31 with SMTP id d2-20020a170902728200b001e27356aa31mr1882050pll.34.1712232061199; Thu, 04 Apr 2024 05:01:01 -0700 (PDT) Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <20240305004859.201085-1-aford173@gmail.com> <20240305081816.GF12503@pendragon.ideasonboard.com> In-Reply-To: <20240305081816.GF12503@pendragon.ideasonboard.com> From: Adam Ford Date: Thu, 4 Apr 2024 07:00:49 -0500 Message-ID: Subject: Re: [PATCH V2 1/2] drm/bridge: adv7511: Allow IRQ to share GPIO pins To: Laurent Pinchart Cc: dri-devel@lists.freedesktop.org, aford@beaconembedded.com, Rob Herring , Krzysztof Kozlowski , Conor Dooley , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Andrzej Hajda , Neil Armstrong , Robert Foss , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , devicetree@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, Mar 5, 2024 at 2:18=E2=80=AFAM Laurent Pinchart wrote: > > Hello Adam, > > Thank you for the patch. > > On Mon, Mar 04, 2024 at 06:48:57PM -0600, Adam Ford wrote: > > 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 > > Reviewed-by: Laurent Pinchart Gentle nudge on this one. It's been about a month, and without it, it is preventing hot-plug detection on one board for me. Thanks adam > > > --- > > 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 *adv= 7511, 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 =3D devm_request_threaded_irq(dev, i2c->irq, NULL, > > adv7511_irq_handler, > > - IRQF_ONESHOT, dev_name(de= v), > > + IRQF_ONESHOT | IRQF_SHARE= D, > > + dev_name(dev), > > adv7511); > > if (ret) > > goto err_unregister_audio; > > -- > Regards, > > Laurent Pinchart