Refactor the function to easaly construct error paths later on. The
error handling gets dirty if we don't refactor the code yet. While on it
I fixed a missing i2c_put_adapter() if the bind() fails.
Signed-off-by: Marco Felsch <m.felsch@xxxxxxxxxxxxxx>
---
drivers/gpu/drm/imx/imx-ldb.c | 246 ++++++++++++++++++----------------
1 file changed, 132 insertions(+), 114 deletions(-)
diff --git a/drivers/gpu/drm/imx/imx-ldb.c b/drivers/gpu/drm/imx/imx-ldb.c
index 0e5a3c84df10..5e6c1b09dbfa 100644
--- a/drivers/gpu/drm/imx/imx-ldb.c
+++ b/drivers/gpu/drm/imx/imx-ldb.c
@@ -441,64 +441,6 @@ static int imx_ldb_get_clk(struct imx_ldb *ldb, int chno)
return PTR_ERR_OR_ZERO(ldb->clk_pll[chno]);
}
-static int imx_ldb_register_channel(struct drm_device *drm,
- struct imx_ldb_channel *imx_ldb_ch,
- struct imx_ldb_connector *imx_ldb_con)
-{
- struct imx_ldb *ldb = imx_ldb_ch->ldb;
- struct drm_encoder *encoder = &imx_ldb_ch->encoder;
- struct drm_connector *connector = &imx_ldb_con->connector;
- int ret;
-
- ret = imx_drm_encoder_parse_of(drm, encoder, imx_ldb_ch->child);
- if (ret)
- return ret;
-
- ret = imx_ldb_get_clk(ldb, imx_ldb_ch->chno);
- if (ret)
- return ret;
-
- if (imx_ldb_is_dual(ldb)) {
- ret = imx_ldb_get_clk(ldb, 1);
- if (ret)
- return ret;
- }
-
- drm_encoder_helper_add(encoder, &imx_ldb_encoder_helper_funcs);
- drm_encoder_init(drm, encoder, &imx_ldb_encoder_funcs,
- DRM_MODE_ENCODER_LVDS, NULL);
-
- if (imx_ldb_ch->bridge) {
- ret = drm_bridge_attach(encoder, imx_ldb_ch->bridge, NULL);
- if (ret) {
- DRM_ERROR("Failed to initialize bridge with drm\n");
- return ret;
- }
- } else {
- /*
- * We want to add the connector whenever there is no bridge
- * that brings its own, not only when there is a panel. For
- * historical reasons, the ldb driver can also work without
- * a panel.
- */
- drm_connector_helper_add(connector,
- &imx_ldb_connector_helper_funcs);
- drm_connector_init_with_ddc(drm, connector,
- &imx_ldb_connector_funcs,
- DRM_MODE_CONNECTOR_LVDS,
- imx_ldb_con->ddc);
- drm_connector_attach_encoder(connector, encoder);
- }
-
- if (imx_ldb_ch->panel) {
- ret = drm_panel_attach(imx_ldb_ch->panel, connector);
- if (ret)
- return ret;
- }
-
- return 0;
-}
-
struct imx_ldb_bit_mapping {
u32 bus_format;
u32 datawidth;
@@ -576,6 +518,136 @@ static int imx_ldb_panel_ddc(struct device *dev,
return 0;
}
+static int imx_ldb_setup_channel(struct device *dev,
+ struct device_node *child,
+ struct drm_device *drm,
+ struct imx_ldb *ldb,
+ int channel_number)
+{
+ struct imx_ldb_channel *channel;
+ struct imx_ldb_connector *imx_ldb_con;
+ struct drm_encoder *encoder;
+ struct drm_connector *connector = NULL;
+ int bus_format;
+ int ret;
+
+ /*
+ * 1) Parse all available data and alloc needed structs
+ * 2) Setup the HW
+ * 3) Register it with the DRM framework
+ * 4) Attach bridge or connector to encoder
+ */
+ channel = devm_kzalloc(dev, sizeof(*channel), GFP_KERNEL);
+ if (!channel)
+ return -ENOMEM;
+
+ channel->ldb = ldb;
+ channel->chno = channel_number;
+ channel->child = child;
+ encoder = &channel->encoder;
+
+ /*
+ * The output port is port@4 with an external 4-port mux or
+ * port@2 with the internal 2-port mux.
+ */
+ ret = drm_of_find_panel_or_bridge(child,
+ ldb->lvds_mux ? 4 : 2, 0,
+ &channel->panel, &channel->bridge);
+ if (ret && ret != -ENODEV)
+ return ret;
+
+ /* panel ddc only if there is no bridge */
+ if (!channel->bridge) {
+ imx_ldb_con = devm_kzalloc(dev, sizeof(*connector), GFP_KERNEL);
+ if (!imx_ldb_con)
+ return -ENOMEM;
+
+ ret = imx_ldb_panel_ddc(dev, channel, imx_ldb_con, child);
+ if (ret)
+ return ret;
+
+ imx_ldb_con->ldb_channel = channel;
+ connector = &imx_ldb_con->connector;
+ }
+
+ bus_format = of_get_bus_format(dev, child);
+ if (bus_format == -EINVAL) {
+ /*
+ * If no bus format was specified in the device tree,
+ * we can still get it from the connected panel later.
+ */
+ if (channel->panel && channel->panel->funcs &&
+ channel->panel->funcs->get_modes)
+ bus_format = 0;
+ }
+ if (bus_format < 0) {
+ dev_err(dev, "could not determine data mapping: %d\n",
+ bus_format);
+ ret = bus_format;
+ goto err_put_ddc;
+ }
+ channel->bus_format = bus_format;
+
+ /* 2) Setup the HW */
+ ret = imx_ldb_get_clk(channel->ldb, channel->chno);
+ if (ret)
+ goto err_put_ddc;
+
+ if (imx_ldb_is_dual(ldb)) {
+ ret = imx_ldb_get_clk(ldb, 1);
+ if (ret)
+ goto err_put_ddc;
+ }
+
+ /* 3) Register it with the DRM framework */
+ ret = imx_drm_encoder_parse_of(drm, encoder, channel->child);
+ if (ret)
+ goto err_put_ddc;
+
+ drm_encoder_helper_add(encoder, &imx_ldb_encoder_helper_funcs);
+ drm_encoder_init(drm, encoder, &imx_ldb_encoder_funcs,
+ DRM_MODE_ENCODER_LVDS, NULL);
+
+ if (!channel->bridge) {
+ /*
+ * We want to add the connector whenever there is no bridge
+ * that brings its own, not only when there is a panel. For
+ * historical reasons, the ldb driver can also work without
+ * a panel.
+ */
+ drm_connector_helper_add(connector,
+ &imx_ldb_connector_helper_funcs);
+ drm_connector_init_with_ddc(drm, connector,
+ &imx_ldb_connector_funcs,
+ DRM_MODE_CONNECTOR_LVDS,
+ imx_ldb_con->ddc);
+ }
+
+ /* 4) Attach bridge or connector to encoder */
+ if (channel->bridge) {
+ ret = drm_bridge_attach(encoder, channel->bridge, NULL);
+ if (ret) {
+ DRM_ERROR("Failed to initialize bridge with drm\n");
+ goto err_put_ddc;
+ }
+ } else {
+ drm_connector_attach_encoder(connector, encoder);
+ }
+
+ if (channel->panel) {
+ ret = drm_panel_attach(channel->panel, connector);
+ if (ret)
+ goto err_put_ddc;
+ }
+
+ return 0;
+
+err_put_ddc:
+ if (imx_ldb_con)
+ i2c_put_adapter(imx_ldb_con->ddc);
+ return ret;
+}
+
static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
{
struct drm_device *drm = data;
@@ -587,9 +659,6 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
int i;
for_each_child_of_node(np, child) {
- struct imx_ldb_channel *channel;
- struct imx_ldb_connector *connector;
- int bus_format;
ret = of_property_read_u32(child, "reg", &i);
if (ret || i < 0 || i > 1) {
@@ -605,60 +674,9 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
continue;
}
- channel = devm_kzalloc(dev, sizeof(*channel), GFP_KERNEL);
- if (!channel)
- return -ENOMEM;
-
- channel->ldb = imx_ldb;
- channel->chno = i;
-
- /*
- * The output port is port@4 with an external 4-port mux or
- * port@2 with the internal 2-port mux.
- */
- ret = drm_of_find_panel_or_bridge(child,
- imx_ldb->lvds_mux ? 4 : 2, 0,
- &channel->panel, &channel->bridge);
- if (ret && ret != -ENODEV)
- goto free_child;
-
- /* panel ddc only if there is no bridge */
- if (!channel->bridge) {
- connector = devm_kzalloc(dev, sizeof(*connector), GFP_KERNEL);
- if (!connector)
- return -ENOMEM;
-
- ret = imx_ldb_panel_ddc(dev, channel, connector, child);
- if (ret)
- goto free_child;
-
- connector->ldb_channel = channel;
- }
-
- bus_format = of_get_bus_format(dev, child);
- if (bus_format == -EINVAL) {
- /*
- * If no bus format was specified in the device tree,
- * we can still get it from the connected panel later.
- */
- if (channel->panel && channel->panel->funcs &&
- channel->panel->funcs->get_modes)
- bus_format = 0;
- }
- if (bus_format < 0) {
- dev_err(dev, "could not determine data mapping: %d\n",
- bus_format);
- ret = bus_format;
- goto free_child;
- }
- channel->bus_format = bus_format;
- channel->child = child;
-
- ret = imx_ldb_register_channel(drm, channel, connector);
- if (ret) {
- channel->child = NULL;
+ ret = imx_ldb_setup_channel(dev, child, drm, imx_ldb, i);
+ if (ret)
goto free_child;
- }
}
return 0;
--
2.20.1
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