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path: root/drivers/gpu/drm/udl/udl_connector.c
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Diffstat (limited to 'drivers/gpu/drm/udl/udl_connector.c')
-rw-r--r--drivers/gpu/drm/udl/udl_connector.c17
1 files changed, 15 insertions, 2 deletions
diff --git a/drivers/gpu/drm/udl/udl_connector.c b/drivers/gpu/drm/udl/udl_connector.c
index 512f44add89f..fe5cdbcf2636 100644
--- a/drivers/gpu/drm/udl/udl_connector.c
+++ b/drivers/gpu/drm/udl/udl_connector.c
@@ -22,13 +22,17 @@
static u8 *udl_get_edid(struct udl_device *udl)
{
u8 *block;
- char rbuf[3];
+ char *rbuf;
int ret, i;
block = kmalloc(EDID_LENGTH, GFP_KERNEL);
if (block == NULL)
return NULL;
+ rbuf = kmalloc(2, GFP_KERNEL);
+ if (rbuf == NULL)
+ goto error;
+
for (i = 0; i < EDID_LENGTH; i++) {
ret = usb_control_msg(udl->ddev->usbdev,
usb_rcvctrlpipe(udl->ddev->usbdev, 0), (0x02),
@@ -36,16 +40,17 @@ static u8 *udl_get_edid(struct udl_device *udl)
HZ);
if (ret < 1) {
DRM_ERROR("Read EDID byte %d failed err %x\n", i, ret);
- i--;
goto error;
}
block[i] = rbuf[1];
}
+ kfree(rbuf);
return block;
error:
kfree(block);
+ kfree(rbuf);
return NULL;
}
@@ -57,6 +62,14 @@ static int udl_get_modes(struct drm_connector *connector)
edid = (struct edid *)udl_get_edid(udl);
+ /*
+ * We only read the main block, but if the monitor reports extension
+ * blocks then the drm edid code expects them to be present, so patch
+ * the extension count to 0.
+ */
+ edid->checksum += edid->extensions;
+ edid->extensions = 0;
+
drm_mode_connector_update_edid_property(connector, edid);
ret = drm_add_edid_modes(connector, edid);
kfree(edid);
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