From patchwork Thu Mar 7 13:38:49 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxime Ripard X-Patchwork-Id: 778734 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 5790813A257; Thu, 7 Mar 2024 13:39:58 +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=1709818798; cv=none; b=VvKObYTwKXRXTS3u4NIu8gSuNPqZltMvABpUdNY3yKVReyXKhL14c+AzWvefRn83cAxiO8p2hAMyiXtPzDw5d1uls6DzUYwAD2bptOrCijSPrAMwFoB9KfwD166iZXkWwUdBW92huUwEU8aJZuJ8bX4fX12ATltAKn/Wo2dcyjA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709818798; c=relaxed/simple; bh=8/opTRplB5Ku39o1OEl1lg2hR6YKBkFWnOlEJPXB6sg=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=ayGArZe3I9M6b7zhHq3rzP9/Lsmwhe8yfMijdBLZDtYfKgOHcHugIOuOdglL5L1z5HFQNZOowviiY59KICBtFfMJEFegLY1TaDfOd5m0oD7uNdF1iF8BveEqcEXlcJdSnPCnPniz1ONgxvt0QdRndAHt1vNYyuaU0KBv7BcPVqI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=MdDA3bhb; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="MdDA3bhb" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8DEBEC433F1; Thu, 7 Mar 2024 13:39:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1709818797; bh=8/opTRplB5Ku39o1OEl1lg2hR6YKBkFWnOlEJPXB6sg=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=MdDA3bhbX/OzxExLma434a37a9DescftEPHuAB00drw/SRBYGrQiQ59SgPAUcf1Zb ukXNzhbm7tYC9NGmJE3N4aHHSOA6XSZtFAbnoEqUUL23KPdqcx7E4vJNAWQt9E07DA n73WdtIHUBSneOkxmdoLUJIsA6oRrrNB6+x1y6BogouCxbSxxU83h0tgbjbgaqBbeb z2idhPOkf8lle1/6dr0NSF56NJ0nKq6wjCVoEo/0DqGloTCNEou8HK//30ueAUIk2K 8XnljkcT83CMVpW2F7Ne8HO5LK4JqrFJzncC2F+eLa47uJsI5w4mNsPYXAtvfOUIrO gMempxCxLHh/g== From: Maxime Ripard Date: Thu, 07 Mar 2024 14:38:49 +0100 Subject: [PATCH v8 22/27] drm/connector: hdmi: Create Infoframe DebugFS entries Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240307-kms-hdmi-connector-state-v8-22-ef6a6f31964b@kernel.org> References: <20240307-kms-hdmi-connector-state-v8-0-ef6a6f31964b@kernel.org> In-Reply-To: <20240307-kms-hdmi-connector-state-v8-0-ef6a6f31964b@kernel.org> To: Maarten Lankhorst , Thomas Zimmermann , David Airlie , Daniel Vetter , Jonathan Corbet , Sandy Huang , =?utf-8?q?Heiko_St=C3=BCbner?= , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland Cc: Hans Verkuil , Sebastian Wick , =?utf-8?b?VmlsbGUgU3lyasOkbMOk?= , dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-sunxi@lists.linux.dev, Maxime Ripard X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=4334; i=mripard@kernel.org; h=from:subject:message-id; bh=8/opTRplB5Ku39o1OEl1lg2hR6YKBkFWnOlEJPXB6sg=; b=owGbwMvMwCX2+D1vfrpE4FHG02pJDKkvD2d+OGJ7xDM02Cxbq1XLLCg6td9h1fpKD/3nR922y nnxK3J2lLIwiHExyIopssQImy+JOzXrdScb3zyYOaxMIEMYuDgFYCKKvxgZ7hsd9irbPmf9DrGl t9nyGdZNU8v66OPNtOzSp+gQRSktVob/Dh7ufJ+rjns1VPjZLrjhrKlqc25nfcWhRmG+1X2TuA/ wAwA= X-Developer-Key: i=mripard@kernel.org; a=openpgp; fpr=BE5675C37E818C8B5764241C254BCFC56BF6CE8D 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 08fcefd804bc..160389f3d84b 100644 --- a/drivers/gpu/drm/drm_debugfs.c +++ b/drivers/gpu/drm/drm_debugfs.c @@ -518,10 +518,118 @@ static const struct file_operations drm_connector_fops = { .llseek = seq_lseek, .release = single_release, .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, hdr_drm); + if (ret) + return ret; + + ret = CREATE_HDMI_INFOFRAME_FILE(connector, parent, spd); + if (ret) + return ret; + + ret = CREATE_HDMI_INFOFRAME_FILE(connector, parent, hdmi); + 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_device *dev = connector->dev; struct dentry *root; @@ -545,10 +653,12 @@ void drm_debugfs_connector_add(struct drm_connector *connector) /* max bpc */ 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); } void drm_debugfs_connector_remove(struct drm_connector *connector)