drm/mgag200: Embed connector instance in struct mga_device

Storing the connector instance in struct mga_device avoids some
dynamic memory allocation. On errors, the connector's initializer
function now destroys the i2c structure. Done in preparation of
converting mgag200 to simple-KMS helpers.

v2:
	* improved commit message (Michael)
	* fixed error message for mgag200_vga_connector_init() (Sam)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Tested-by: John Donnelly <John.p.donnelly@oracle.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200507090315.21274-7-tzimmermann@suse.de

diff --git a/drivers/gpu/drm/mgag200/mgag200_drv.h b/drivers/gpu/drm/mgag200/mgag200_drv.h
index 40e6ffb..d9b7e96 100644 (file)
--- a/drivers/gpu/drm/mgag200/mgag200_drv.h
+++ b/drivers/gpu/drm/mgag200/mgag200_drv.h
@@ -171,6 +171,7 @@ struct mga_device {
        /* SE model number stored in reg 0x1e24 */
        u32 unique_rev_id;
 
+       struct mga_connector connector;
        struct drm_encoder encoder;
 };
 

diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c b/drivers/gpu/drm/mgag200/mgag200_mode.c
index 1d1e937..5f4ac36 100644 (file)
--- a/drivers/gpu/drm/mgag200/mgag200_mode.c
+++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
@@ -1448,6 +1448,10 @@ static void mga_crtc_init(struct mga_device *mdev)
        drm_crtc_helper_add(&mga_crtc->base, &mga_helper_funcs);
 }
 
+/*
+ * Connector
+ */
+
 static int mga_vga_get_modes(struct drm_connector *connector)
 {
        struct mga_connector *mga_connector = to_mga_connector(connector);
@@ -1572,7 +1576,6 @@ static void mga_connector_destroy(struct drm_connector *connector)
        struct mga_connector *mga_connector = to_mga_connector(connector);
        mgag200_i2c_destroy(mga_connector->i2c);
        drm_connector_cleanup(connector);
-       kfree(connector);
 }
 
 static const struct drm_connector_helper_funcs mga_vga_connector_helper_funcs = {
@@ -1586,30 +1589,33 @@ static const struct drm_connector_funcs mga_vga_connector_funcs = {
        .destroy = mga_connector_destroy,
 };
 
-static struct drm_connector *mga_vga_init(struct drm_device *dev)
+static int mgag200_vga_connector_init(struct mga_device *mdev)
 {
-       struct drm_connector *connector;
-       struct mga_connector *mga_connector;
-
-       mga_connector = kzalloc(sizeof(struct mga_connector), GFP_KERNEL);
-       if (!mga_connector)
-               return NULL;
-
-       connector = &mga_connector->base;
-       mga_connector->i2c = mgag200_i2c_create(dev);
-       if (!mga_connector->i2c)
-               DRM_ERROR("failed to add ddc bus\n");
+       struct drm_device *dev = mdev->dev;
+       struct mga_connector *mconnector = &mdev->connector;
+       struct drm_connector *connector = &mconnector->base;
+       struct mga_i2c_chan *i2c;
+       int ret;
 
-       drm_connector_init_with_ddc(dev, connector,
-                                   &mga_vga_connector_funcs,
-                                   DRM_MODE_CONNECTOR_VGA,
-                                   &mga_connector->i2c->adapter);
+       i2c = mgag200_i2c_create(dev);
+       if (!i2c)
+               drm_warn(dev, "failed to add DDC bus\n");
 
+       ret = drm_connector_init_with_ddc(dev, connector,
+                                         &mga_vga_connector_funcs,
+                                         DRM_MODE_CONNECTOR_VGA,
+                                         &i2c->adapter);
+       if (ret)
+               goto err_mgag200_i2c_destroy;
        drm_connector_helper_add(connector, &mga_vga_connector_helper_funcs);
 
-       drm_connector_register(connector);
+       mconnector->i2c = i2c;
 
-       return connector;
+       return 0;
+
+err_mgag200_i2c_destroy:
+       mgag200_i2c_destroy(i2c);
+       return ret;
 }
 
 static const struct drm_mode_config_funcs mgag200_mode_config_funcs = {
@@ -1628,7 +1634,7 @@ int mgag200_modeset_init(struct mga_device *mdev)
 {
        struct drm_device *dev = mdev->dev;
        struct drm_encoder *encoder = &mdev->encoder;
-       struct drm_connector *connector;
+       struct drm_connector *connector = &mdev->connector.base;
        int ret;
 
        mdev->bpp_shifts[0] = 0;
@@ -1664,10 +1670,12 @@ int mgag200_modeset_init(struct mga_device *mdev)
        }
        encoder->possible_crtcs = 0x1;
 
-       connector = mga_vga_init(dev);
-       if (!connector) {
-               DRM_ERROR("mga_vga_init failed\n");
-               return -1;
+       ret = mgag200_vga_connector_init(mdev);
+       if (ret) {
+               drm_err(dev,
+                       "mgag200_vga_connector_init() failed, error %d\n",
+                       ret);
+               return ret;
        }
 
        drm_connector_attach_encoder(connector, encoder);