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charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20240521-kms-hdmi-connector-state-v14-23-51950db4fedb@kernel.org> References: <20240521-kms-hdmi-connector-state-v14-0-51950db4fedb@kernel.org> In-Reply-To: <20240521-kms-hdmi-connector-state-v14-0-51950db4fedb@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 , Andy Yan Cc: Hans Verkuil , Sebastian Wick , =?utf-8?q?Ville_Syrj=C3=A4l=C3=A4?= , 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 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=5419; i=mripard@kernel.org; h=from:subject:message-id; bh=jTBz0ob9iuEpIQKBkFz6nD4R8YQTfSw4yt4sHjlZsdU=; b=owGbwMvMwCmsHn9OcpHtvjLG02pJDGk+xbcOXtQKX7qKa/L2M9uescUEGXxkOvmK26/yRtwJz tcV7ZoPO6ayMAhzMsiKKbI8kQk7vbx9cZWD/cofMHNYmUCGMHBxCsBExEwYa+V93Pmm1Uz6/8Hh zfaLq0Qqt/zZ+WS3p+K1yRp73N0uFE0Vv3whmj95Id9kNX3tIu3VAoz1/jxLE00qNJ4eW6cTy8A f17L3todgxJQXJ3bW8R+R3lHrKSJurnG6p2dz0tJLvnk64s0A 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 | 152 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 152 insertions(+) diff --git a/drivers/gpu/drm/drm_debugfs.c b/drivers/gpu/drm/drm_debugfs.c index 08fcefd804bc..dd39a5b7a711 100644 --- a/drivers/gpu/drm/drm_debugfs.c +++ b/drivers/gpu/drm/drm_debugfs.c @@ -518,10 +518,160 @@ static const struct file_operations drm_connector_fops = { .llseek = seq_lseek, .release = single_release, .write = connector_write }; +#define HDMI_MAX_INFOFRAME_SIZE 29 + +static ssize_t +audio_infoframe_read(struct file *filp, char __user *ubuf, size_t count, loff_t *ppos) +{ + struct drm_connector_hdmi_infoframe *infoframe; + struct drm_connector *connector; + union hdmi_infoframe *frame; + u8 buf[HDMI_INFOFRAME_SIZE(AUDIO)]; + ssize_t len = 0; + + connector = filp->private_data; + mutex_lock(&connector->hdmi.infoframes.lock); + + infoframe = &connector->hdmi.infoframes.audio; + if (!infoframe->set) + goto out; + + frame = &infoframe->data; + 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 audio_infoframe_fops = { + .owner = THIS_MODULE, + .open = simple_open, + .read = audio_infoframe_read, +}; + +static int create_hdmi_audio_infoframe_file(struct drm_connector *connector, + struct dentry *parent) +{ + struct dentry *file; + + file = debugfs_create_file("audio", 0400, parent, connector, &audio_infoframe_fops); + if (IS_ERR(file)) + return PTR_ERR(file); + + return 0; +} + +#define DEFINE_INFOFRAME_FILE(_f) \ +static ssize_t _f##_read_infoframe(struct file *filp, \ + char __user *ubuf, \ + size_t count, \ + loff_t *ppos) \ +{ \ + struct drm_connector_hdmi_infoframe *infoframe; \ + struct drm_connector_state *conn_state; \ + struct drm_connector *connector; \ + union hdmi_infoframe *frame; \ + struct drm_device *dev; \ + u8 buf[HDMI_MAX_INFOFRAME_SIZE]; \ + ssize_t len = 0; \ + \ + connector = filp->private_data; \ + dev = connector->dev; \ + \ + drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); \ + \ + conn_state = connector->state; \ + infoframe = &conn_state->hdmi.infoframes._f; \ + if (!infoframe->set) \ + goto out; \ + \ + frame = &infoframe->data; \ + len = hdmi_infoframe_pack(frame, buf, sizeof(buf)); \ + if (len < 0) \ + goto out; \ + \ + len = simple_read_from_buffer(ubuf, count, ppos, buf, len); \ + \ +out: \ + drm_modeset_unlock(&dev->mode_config.connection_mutex); \ + return len; \ +} \ +\ +static const struct file_operations _f##_infoframe_fops = { \ + .owner = THIS_MODULE, \ + .open = simple_open, \ + .read = _f##_read_infoframe, \ +}; \ +\ +static int create_hdmi_## _f ## _infoframe_file (struct drm_connector *connector, \ + struct dentry *parent) \ +{ \ + struct dentry *file; \ + \ + file = debugfs_create_file(#_f, 0400, parent, connector, & _f ## _infoframe_fops); \ + if (IS_ERR(file)) \ + return PTR_ERR(file); \ + \ + return 0; \ +} + +DEFINE_INFOFRAME_FILE(avi); +DEFINE_INFOFRAME_FILE(hdmi); +DEFINE_INFOFRAME_FILE(hdr_drm); +DEFINE_INFOFRAME_FILE(spd); + +static int create_hdmi_infoframe_files(struct drm_connector *connector, + struct dentry *parent) +{ + int ret; + + ret = create_hdmi_audio_infoframe_file(connector, parent); + if (ret) + return ret; + + ret = create_hdmi_avi_infoframe_file(connector, parent); + if (ret) + return ret; + + ret = create_hdmi_hdmi_infoframe_file(connector, parent); + if (ret) + return ret; + + ret = create_hdmi_hdr_drm_infoframe_file(connector, parent); + if (ret) + return ret; + + ret = create_hdmi_spd_infoframe_file(connector, parent); + 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 +695,12 @@ 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) -- 2.45.0