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authorThomas Wood <thomas.wood@intel.com>2014-06-18 17:52:33 +0100
committerDaniel Vetter <daniel.vetter@ffwll.ch>2014-06-19 08:56:28 +0200
commit4cf2b28146713d39f78bd62002a8ab00075c63b7 (patch)
tree15ca4887226be1bd45cd3334a4d0d2d383e855bb /drivers/gpu/drm/drm_debugfs.c
parent30f6570798f6c897df4f1f2c676d803728bfec27 (diff)
downloadop-kernel-dev-4cf2b28146713d39f78bd62002a8ab00075c63b7.zip
op-kernel-dev-4cf2b28146713d39f78bd62002a8ab00075c63b7.tar.gz
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.c68
1 files changed, 68 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_debugfs.c b/drivers/gpu/drm/drm_debugfs.c
index 8ab3f3e..13bd429 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:
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