From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 E8BDE1CA8F; Mon, 1 Apr 2024 16:02:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711987362; cv=none; b=k82fwIHUwHNcAyeNkuDpwTCKHqd97/wCLNb1oEQb9p7H7MArEF7VgWfF6ffuB+fW8eoK907kMbU6xtaWOgxOw36WO0lTbbEIthBo5Kni1Llbb1GQ0SP8oiTRCoMaM0cPhTy3rohzEqZe7pqxwNiJJe5iJnKZUrYlbMDxpqTvhT8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711987362; c=relaxed/simple; bh=XspA0GcmHm0c8r59PsKRrWCfMy+4E4X0qWvE/YL6jck=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=SqE0atTUiGrlwrKV/Ze/GINENgr2s2RZ1y5HQPQrasHmj31izS4q1A/3m1Ga1FsYmxC9bkCXGXm3qkt9Q88YdCdXtAxlRTLvuMoWx+oug6YIRG3oLffMcM7JEGn1grZcYFPbrNFM3PzFM4CE6QlD4UZJEdJu4YIoehC+Egsnw1A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=002YjZuT; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="002YjZuT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6E767C433C7; Mon, 1 Apr 2024 16:02:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1711987361; bh=XspA0GcmHm0c8r59PsKRrWCfMy+4E4X0qWvE/YL6jck=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=002YjZuTwYEIWrX6GcWHA1lnBmK2Wv2piuNEKno8JScBZRxWtzJq3HdMC7DMfen0X 69xMbX9rR9vt9E3kwrfgCW6HfNgSJKqZHHyIv4uiZyr5NKb3if8h+2uG5IFdltPR1X uV2s4daEs5XLGCJyg9xrAkLr0ZWCkAurdtKmTMnQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jani Nikula , Neil Armstrong , Sasha Levin Subject: [PATCH 6.8 236/399] drm/bridge: add ->edid_read hook and drm_bridge_edid_read() Date: Mon, 1 Apr 2024 17:43:22 +0200 Message-ID: <20240401152556.223184936@linuxfoundation.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240401152549.131030308@linuxfoundation.org> References: <20240401152549.131030308@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.8-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jani Nikula [ Upstream commit d807ad80d811ba0c22adfd871e2a46491f80d6e2 ] Add new struct drm_edid based ->edid_read hook and drm_bridge_edid_read() function to call the hook. v2: Include drm/drm_edid.h Signed-off-by: Jani Nikula Reviewed-by: Neil Armstrong Link: https://patchwork.freedesktop.org/patch/msgid/9d08d22eaffcb9c59a2b677e45d7e61fc689bc2f.1706038510.git.jani.nikula@intel.com Stable-dep-of: 171b711b26cc ("drm/bridge: lt8912b: do not return negative values from .get_modes()") Signed-off-by: Sasha Levin --- drivers/gpu/drm/drm_bridge.c | 46 +++++++++++++++++++++++++++++++++++- include/drm/drm_bridge.h | 33 ++++++++++++++++++++++++++ 2 files changed, 78 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c index cee3188adf3d5..4f6f8c662d3fe 100644 --- a/drivers/gpu/drm/drm_bridge.c +++ b/drivers/gpu/drm/drm_bridge.c @@ -27,8 +27,9 @@ #include #include -#include #include +#include +#include #include #include #include @@ -1206,6 +1207,47 @@ int drm_bridge_get_modes(struct drm_bridge *bridge, } EXPORT_SYMBOL_GPL(drm_bridge_get_modes); +/** + * drm_bridge_edid_read - read the EDID data of the connected display + * @bridge: bridge control structure + * @connector: the connector to read EDID for + * + * If the bridge supports output EDID retrieval, as reported by the + * DRM_BRIDGE_OP_EDID bridge ops flag, call &drm_bridge_funcs.edid_read to get + * the EDID and return it. Otherwise return NULL. + * + * If &drm_bridge_funcs.edid_read is not set, fall back to using + * drm_bridge_get_edid() and wrapping it in struct drm_edid. + * + * RETURNS: + * The retrieved EDID on success, or NULL otherwise. + */ +const struct drm_edid *drm_bridge_edid_read(struct drm_bridge *bridge, + struct drm_connector *connector) +{ + if (!(bridge->ops & DRM_BRIDGE_OP_EDID)) + return NULL; + + /* Transitional: Fall back to ->get_edid. */ + if (!bridge->funcs->edid_read) { + const struct drm_edid *drm_edid; + struct edid *edid; + + edid = drm_bridge_get_edid(bridge, connector); + if (!edid) + return NULL; + + drm_edid = drm_edid_alloc(edid, (edid->extensions + 1) * EDID_LENGTH); + + kfree(edid); + + return drm_edid; + } + + return bridge->funcs->edid_read(bridge, connector); +} +EXPORT_SYMBOL_GPL(drm_bridge_edid_read); + /** * drm_bridge_get_edid - get the EDID data of the connected display * @bridge: bridge control structure @@ -1215,6 +1257,8 @@ EXPORT_SYMBOL_GPL(drm_bridge_get_modes); * DRM_BRIDGE_OP_EDID bridge ops flag, call &drm_bridge_funcs.get_edid to * get the EDID and return it. Otherwise return NULL. * + * Deprecated. Prefer using drm_bridge_edid_read(). + * * RETURNS: * The retrieved EDID on success, or NULL otherwise. */ diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h index e39da5807ba71..b7aed3ead705b 100644 --- a/include/drm/drm_bridge.h +++ b/include/drm/drm_bridge.h @@ -557,6 +557,37 @@ struct drm_bridge_funcs { int (*get_modes)(struct drm_bridge *bridge, struct drm_connector *connector); + /** + * @edid_read: + * + * Read the EDID data of the connected display. + * + * The @edid_read callback is the preferred way of reporting mode + * information for a display connected to the bridge output. Bridges + * that support reading EDID shall implement this callback and leave + * the @get_modes callback unimplemented. + * + * The caller of this operation shall first verify the output + * connection status and refrain from reading EDID from a disconnected + * output. + * + * This callback is optional. Bridges that implement it shall set the + * DRM_BRIDGE_OP_EDID flag in their &drm_bridge->ops. + * + * The connector parameter shall be used for the sole purpose of EDID + * retrieval, and shall not be stored internally by bridge drivers for + * future usage. + * + * RETURNS: + * + * An edid structure newly allocated with drm_edid_alloc() or returned + * from drm_edid_read() family of functions on success, or NULL + * otherwise. The caller is responsible for freeing the returned edid + * structure with drm_edid_free(). + */ + const struct drm_edid *(*edid_read)(struct drm_bridge *bridge, + struct drm_connector *connector); + /** * @get_edid: * @@ -888,6 +919,8 @@ drm_atomic_helper_bridge_propagate_bus_fmt(struct drm_bridge *bridge, enum drm_connector_status drm_bridge_detect(struct drm_bridge *bridge); int drm_bridge_get_modes(struct drm_bridge *bridge, struct drm_connector *connector); +const struct drm_edid *drm_bridge_edid_read(struct drm_bridge *bridge, + struct drm_connector *connector); struct edid *drm_bridge_get_edid(struct drm_bridge *bridge, struct drm_connector *connector); void drm_bridge_hpd_enable(struct drm_bridge *bridge, -- 2.43.0