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author | Thomas Wood <thomas.wood@intel.com> | 2014-06-18 17:52:33 +0100 |
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committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2014-06-19 08:56:28 +0200 |
commit | 4cf2b28146713d39f78bd62002a8ab00075c63b7 (patch) | |
tree | 15ca4887226be1bd45cd3334a4d0d2d383e855bb /drivers/gpu/drm/drm_debugfs.c | |
parent | 30f6570798f6c897df4f1f2c676d803728bfec27 (diff) | |
download | linux-4cf2b28146713d39f78bd62002a8ab00075c63b7.tar.gz linux-4cf2b28146713d39f78bd62002a8ab00075c63b7.tar.bz2 linux-4cf2b28146713d39f78bd62002a8ab00075c63b7.zip |
drm/debugfs: add an "edid_override" file per connector
Add a file to debugfs for each connector to allow the EDID to be
overridden.
v2: Copy ubuf before accessing it and reject invalid length data. (David
Herrmann)
Ensure override_edid is reset when a new EDID value is written.
(David Herrmann)
Fix the debugfs file permissions. (David Herrmann)
Signed-off-by: Thomas Wood <thomas.wood@intel.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/drm_debugfs.c')
-rw-r--r-- | drivers/gpu/drm/drm_debugfs.c | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_debugfs.c b/drivers/gpu/drm/drm_debugfs.c index 8ab3f3e38643..13bd42923dd4 100644 --- a/drivers/gpu/drm/drm_debugfs.c +++ b/drivers/gpu/drm/drm_debugfs.c @@ -35,6 +35,7 @@ #include <linux/slab.h> #include <linux/export.h> #include <drm/drmP.h> +#include <drm/drm_edid.h> #if defined(CONFIG_DEBUG_FS) @@ -304,6 +305,67 @@ static ssize_t connector_write(struct file *file, const char __user *ubuf, return len; } +static int edid_show(struct seq_file *m, void *data) +{ + struct drm_connector *connector = m->private; + struct drm_property_blob *edid = connector->edid_blob_ptr; + + if (connector->override_edid && edid) + seq_write(m, edid->data, edid->length); + + return 0; +} + +static int edid_open(struct inode *inode, struct file *file) +{ + struct drm_connector *dev = inode->i_private; + + return single_open(file, edid_show, dev); +} + +static ssize_t edid_write(struct file *file, const char __user *ubuf, + size_t len, loff_t *offp) +{ + struct seq_file *m = file->private_data; + struct drm_connector *connector = m->private; + char *buf; + struct edid *edid; + int ret; + + buf = memdup_user(ubuf, len); + if (IS_ERR(buf)) + return PTR_ERR(buf); + + edid = (struct edid *) buf; + + if (len == 5 && !strncmp(buf, "reset", 5)) { + connector->override_edid = false; + ret = drm_mode_connector_update_edid_property(connector, NULL); + } else if (len < EDID_LENGTH || + EDID_LENGTH * (1 + edid->extensions) > len) + ret = -EINVAL; + else { + connector->override_edid = false; + ret = drm_mode_connector_update_edid_property(connector, edid); + if (!ret) + connector->override_edid = true; + } + + kfree(buf); + + return (ret) ? ret : len; +} + +static const struct file_operations drm_edid_fops = { + .owner = THIS_MODULE, + .open = edid_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, + .write = edid_write +}; + + static const struct file_operations drm_connector_fops = { .owner = THIS_MODULE, .open = connector_open, @@ -333,6 +395,12 @@ int drm_debugfs_connector_add(struct drm_connector *connector) if (!ent) goto error; + /* edid */ + ent = debugfs_create_file("edid_override", S_IRUGO | S_IWUSR, root, + connector, &drm_edid_fops); + if (!ent) + goto error; + return 0; error: |