From patchwork Tue Sep 17 08:53:07 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luca Ceresoli X-Patchwork-Id: 13805990 Received: from relay1-d.mail.gandi.net (relay1-d.mail.gandi.net [217.70.183.193]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A9836169AC5; Tue, 17 Sep 2024 08:53:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.193 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726563208; cv=none; b=WF8tcSRZbdF9piTd0FA6aZMX/lIJx9XCCHO0Er5YKw6V2EOkr0uOWUj/HcSz5hCxQR7Y5g2zwnqufSUzOfsCjinHMJC4TwQUiv0igUmYM9FSSKLidgnc3ywOJShkcJS22ChXIk06LB2M0oTo2bTNnn2FtNWOO2FS0lFu5D8srTA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726563208; c=relaxed/simple; bh=tbi2GjX0sVPxeekko6WyWU769v76iroU9gpWVQtjZyo=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=tuH+oUHdoKcPtOs4EnV3Daw1DDKW1ofRr+pObSV8kZPOJM/J8aKjfbR704FJDIbpP02feKh16wE70ja8bZ4jxmw4wY93oRX2/wsApaKzHsCJr7p+0X/ai6glskxwg24PiaLg9c98HUiB4KhGM/qOlctnz9d6Q2jjS7/zWnwZIe0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=frYdVkIC; arc=none smtp.client-ip=217.70.183.193 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="frYdVkIC" Received: by mail.gandi.net (Postfix) with ESMTPSA id D24F9240011; Tue, 17 Sep 2024 08:53:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1726563204; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=zXfD1uIHQ08PVRbHD3ejH9ya7NUdvN1EDBI59inSFEs=; b=frYdVkICECqGxrTtkHsi9cIFBdFPDUgixWgCirbDgtHtZNVWVR3KlzIw6NP8dhkvn9N4Ot DejauOc53hS6e2Nv0ypLQOLFODrbDFuyQLcQFzgsVMYPkDkQC2hpy0grf97yJBAj2cYqEe yt7no8x0tp9WUryXn3qOJ3FfmFdGIp3tbhVgeAChgtU2KC7bkkOh6eGWDuLJCYpixQolJn EouB1v7dSJiIjro1Fy84d0mYIppHIg1yq1LZNTxd3FI8hjTr5yNUjHUlnBKTfsVloTw3id MgYBCC6Or/wizYW/ocWSQrb83opp4eWp8q2thK6hIRemexFkXPeGDqhncU4abQ== From: Luca Ceresoli Date: Tue, 17 Sep 2024 10:53:07 +0200 Subject: [PATCH v4 3/8] drm/encoder: add drm_encoder_cleanup_from() Precedence: bulk X-Mailing-List: linux-fbdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240917-hotplug-drm-bridge-v4-3-bc4dfee61be6@bootlin.com> References: <20240917-hotplug-drm-bridge-v4-0-bc4dfee61be6@bootlin.com> In-Reply-To: <20240917-hotplug-drm-bridge-v4-0-bc4dfee61be6@bootlin.com> To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , Derek Kiernan , Dragan Cvetic , Arnd Bergmann , Greg Kroah-Hartman , Saravana Kannan , Wolfram Sang , "Rafael J. Wysocki" , Lee Jones , Daniel Thompson , Jingoo Han , Helge Deller Cc: Paul Kocialkowski , =?utf-8?q?Herv=C3=A9_Codina?= , Thomas Petazzoni , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-i2c@vger.kernel.org, linux-fbdev@vger.kernel.org, Paul Kocialkowski , Luca Ceresoli X-Mailer: b4 0.14.1 X-GND-Sasl: luca.ceresoli@bootlin.com Supporting hardware whose final part of the DRM pipeline can be physically removed requires the ability to detach all bridges from a given point to the end of the pipeline. Introduce a variant of drm_encoder_cleanup() for this. Signed-off-by: Luca Ceresoli --- Changes in v3: none Changed in v2: - fix a typo in a comment --- drivers/gpu/drm/drm_encoder.c | 21 +++++++++++++++++++++ include/drm/drm_encoder.h | 1 + 2 files changed, 22 insertions(+) diff --git a/drivers/gpu/drm/drm_encoder.c b/drivers/gpu/drm/drm_encoder.c index 8f2bc6a28482..472dfbefe296 100644 --- a/drivers/gpu/drm/drm_encoder.c +++ b/drivers/gpu/drm/drm_encoder.c @@ -207,6 +207,27 @@ void drm_encoder_cleanup(struct drm_encoder *encoder) } EXPORT_SYMBOL(drm_encoder_cleanup); +/** + * drm_encoder_cleanup_from - remove a given bridge and all the following + * @encoder: encoder whole list of bridges shall be pruned + * @bridge: first bridge to remove + * + * Removes from an encoder all the bridges starting with a given bridge + * and until the end of the chain. + * + * This should not be used in "normal" DRM pipelines. It is only useful for + * devices whose final part of the DRM chain can be physically removed and + * later reconnected (possibly with different hardware). + */ +void drm_encoder_cleanup_from(struct drm_encoder *encoder, struct drm_bridge *bridge) +{ + struct drm_bridge *next; + + list_for_each_entry_safe_from(bridge, next, &encoder->bridge_chain, chain_node) + drm_bridge_detach(bridge); +} +EXPORT_SYMBOL(drm_encoder_cleanup_from); + static void drmm_encoder_alloc_release(struct drm_device *dev, void *ptr) { struct drm_encoder *encoder = ptr; diff --git a/include/drm/drm_encoder.h b/include/drm/drm_encoder.h index 977a9381c8ba..bafcabb24267 100644 --- a/include/drm/drm_encoder.h +++ b/include/drm/drm_encoder.h @@ -320,6 +320,7 @@ static inline struct drm_encoder *drm_encoder_find(struct drm_device *dev, } void drm_encoder_cleanup(struct drm_encoder *encoder); +void drm_encoder_cleanup_from(struct drm_encoder *encoder, struct drm_bridge *bridge); /** * drm_for_each_encoder_mask - iterate over encoders specified by bitmask