From patchwork Tue Oct 31 16:48:25 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxime Ripard X-Patchwork-Id: 13442006 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 0C296C4167D for ; Tue, 31 Oct 2023 16:49:17 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A704510E57B; Tue, 31 Oct 2023 16:49:15 +0000 (UTC) Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by gabe.freedesktop.org (Postfix) with ESMTPS id 756F710E57C for ; Tue, 31 Oct 2023 16:49:11 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by ams.source.kernel.org (Postfix) with ESMTP id BFC92B8118A; Tue, 31 Oct 2023 16:49:09 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D3B26C433C9; Tue, 31 Oct 2023 16:49:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1698770949; bh=BW2baC+EjniG/ZZH9QzIRlNDubJbbQk6ybbnPB50Z5U=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=foPiBi5tPK2qTQLqdUEbrq5fITRnjIv79P//Y6PBhDgB8bRdvMO7XMWaLyEEIHMQk N4vRb7dx/NnkKE0WNCXQt3J38y0RrIJjEF2RGnuA3d4+uatLVBdnsLrnczbY7OIGn9 SS9br04QPi18yqrSp+Rn/0UBCMvLuZ56wSoNEa6TL7XgPQKZIkFG2Jlorp4GAM6kMh bNOoOP9VTQdB6Tp6eL2V/9lhCj0OcEual2DEgThYaEWcXgAiXwcYmdrqtfvxD4jEsP zz8HzlZ2TkzTFdFlnZVAGGuG58mDsOIzsG2IFdj6Zu2qgCAW4ppLRqa3OHbNa/+YBa Rf2jo6iP5sw0g== From: Maxime Ripard Date: Tue, 31 Oct 2023 17:48:25 +0100 Subject: [PATCH RFC v3 12/37] drm/connector: hdmi: Create Infoframe DebugFS entries MIME-Version: 1.0 Message-Id: <20231031-kms-hdmi-connector-state-v3-12-328b0fae43a7@kernel.org> References: <20231031-kms-hdmi-connector-state-v3-0-328b0fae43a7@kernel.org> In-Reply-To: <20231031-kms-hdmi-connector-state-v3-0-328b0fae43a7@kernel.org> To: Maarten Lankhorst , Thomas Zimmermann , David Airlie , Daniel Vetter , Emma Anholt , Jonathan Corbet , Sandy Huang , =?utf-8?q?Heiko_St=C3=BCbner?= , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=4166; i=mripard@kernel.org; h=from:subject:message-id; bh=BW2baC+EjniG/ZZH9QzIRlNDubJbbQk6ybbnPB50Z5U=; b=owGbwMvMwCX2+D1vfrpE4FHG02pJDKmO+ve+vV6x5PiqefFl2psNJZjdl/C2hqwUFLyj5dj9y 7J6Wc31jlIWBjEuBlkxRZYYYfMlcadmve5k45sHM4eVCWQIAxenAEzESpaRYZ+U+WkrMZfiadnm cdY7Z0ouXCNfaLtWrYH7qGxJwPlJVYwM986vumbxYAaPnvt7hh2L67p7y59VSNxr2rLOpNDHMlC WCQA= X-Developer-Key: i=mripard@kernel.org; a=openpgp; fpr=BE5675C37E818C8B5764241C254BCFC56BF6CE8D X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Hans Verkuil , linux-rockchip@lists.infradead.org, Maxime Ripard , linux-sunxi@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" There has been some discussions recently about the infoframes sent by drivers and if they were properly generated. In parallel, there's been some interest in creating an infoframe-decode tool similar to edid-decode. Both would be much easier if we were to expose the infoframes programmed in the hardware. It won't be perfect since we have no guarantee that it's actually what goes through the wire, but it's the best we can do. Signed-off-by: Maxime Ripard --- drivers/gpu/drm/drm_debugfs.c | 110 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 110 insertions(+) diff --git a/drivers/gpu/drm/drm_debugfs.c b/drivers/gpu/drm/drm_debugfs.c index 2de43ff3ce0a..3c65b1d3f926 100644 --- a/drivers/gpu/drm/drm_debugfs.c +++ b/drivers/gpu/drm/drm_debugfs.c @@ -538,6 +538,114 @@ static const struct file_operations drm_connector_fops = { .write = connector_write }; +struct debugfs_wrapper { + struct drm_connector *connector; + struct drm_connector_hdmi_infoframe *frame; +}; + +#define HDMI_MAX_INFOFRAME_SIZE 29 + +static ssize_t +infoframe_read(struct file *filp, char __user *ubuf, size_t count, loff_t *ppos) +{ + const struct debugfs_wrapper *wrapper = filp->private_data; + struct drm_connector *connector = wrapper->connector; + struct drm_connector_hdmi_infoframe *infoframe = wrapper->frame; + union hdmi_infoframe *frame = &infoframe->data; + u8 buf[HDMI_MAX_INFOFRAME_SIZE]; + ssize_t len = 0; + + mutex_lock(&connector->hdmi.infoframes.lock); + + if (!infoframe->set) + goto out; + + len = hdmi_infoframe_pack(frame, buf, sizeof(buf)); + if (len < 0) + goto out; + + len = simple_read_from_buffer(ubuf, count, ppos, buf, len); + +out: + mutex_unlock(&connector->hdmi.infoframes.lock); + return len; +} + +static const struct file_operations infoframe_fops = { + .owner = THIS_MODULE, + .open = simple_open, + .read = infoframe_read, +}; + +static int create_hdmi_infoframe_file(struct drm_connector *connector, + struct dentry *parent, + const char *filename, + struct drm_connector_hdmi_infoframe *frame) +{ + struct drm_device *dev = connector->dev; + struct debugfs_wrapper *wrapper; + struct dentry *file; + + wrapper = drmm_kzalloc(dev, sizeof(*wrapper), GFP_KERNEL); + if (!wrapper) + return -ENOMEM; + + wrapper->connector = connector; + wrapper->frame = frame; + + file = debugfs_create_file(filename, 0400, parent, wrapper, &infoframe_fops); + if (IS_ERR(file)) + return PTR_ERR(file); + + return 0; +} + +#define CREATE_HDMI_INFOFRAME_FILE(c, p, i) \ + create_hdmi_infoframe_file(c, p, #i, &(c)->hdmi.infoframes.i) + +static int create_hdmi_infoframe_files(struct drm_connector *connector, + struct dentry *parent) +{ + int ret; + + ret = CREATE_HDMI_INFOFRAME_FILE(connector, parent, audio); + if (ret) + return ret; + + ret = CREATE_HDMI_INFOFRAME_FILE(connector, parent, avi); + if (ret) + return ret; + + ret = CREATE_HDMI_INFOFRAME_FILE(connector, parent, drm); + if (ret) + return ret; + + ret = CREATE_HDMI_INFOFRAME_FILE(connector, parent, spd); + if (ret) + return ret; + + ret = CREATE_HDMI_INFOFRAME_FILE(connector, parent, vendor); + if (ret) + return ret; + + return 0; +} + +static void hdmi_debugfs_add(struct drm_connector *connector) +{ + struct dentry *dir; + + if (!(connector->connector_type == DRM_MODE_CONNECTOR_HDMIA || + connector->connector_type == DRM_MODE_CONNECTOR_HDMIB)) + return; + + dir = debugfs_create_dir("infoframes", connector->debugfs_entry); + if (IS_ERR(dir)) + return; + + create_hdmi_infoframe_files(connector, dir); +} + void drm_debugfs_connector_add(struct drm_connector *connector) { struct drm_minor *minor = connector->dev->primary; @@ -565,6 +673,8 @@ void drm_debugfs_connector_add(struct drm_connector *connector) debugfs_create_file("output_bpc", 0444, root, connector, &output_bpc_fops); + hdmi_debugfs_add(connector); + if (connector->funcs->debugfs_init) connector->funcs->debugfs_init(connector, root); }