diff options
Diffstat (limited to 'drivers/gpu/drm/imx/imx-ldb.c')
| -rw-r--r-- | drivers/gpu/drm/imx/imx-ldb.c | 78 |
1 files changed, 53 insertions, 25 deletions
diff --git a/drivers/gpu/drm/imx/imx-ldb.c b/drivers/gpu/drm/imx/imx-ldb.c index a58eee59550a..beff793bb717 100644 --- a/drivers/gpu/drm/imx/imx-ldb.c +++ b/drivers/gpu/drm/imx/imx-ldb.c @@ -25,6 +25,7 @@ #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h> #include <linux/of_device.h> #include <linux/of_graph.h> +#include <video/of_display_timing.h> #include <video/of_videomode.h> #include <linux/regmap.h> #include <linux/videodev2.h> @@ -59,6 +60,7 @@ struct imx_ldb_channel { struct drm_encoder encoder; struct drm_panel *panel; struct device_node *child; + struct i2c_adapter *ddc; int chno; void *edid; int edid_len; @@ -107,6 +109,9 @@ static int imx_ldb_connector_get_modes(struct drm_connector *connector) return num_modes; } + if (!imx_ldb_ch->edid && imx_ldb_ch->ddc) + imx_ldb_ch->edid = drm_get_edid(connector, imx_ldb_ch->ddc); + if (imx_ldb_ch->edid) { drm_mode_connector_update_edid_property(connector, imx_ldb_ch->edid); @@ -553,7 +558,8 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data) for_each_child_of_node(np, child) { struct imx_ldb_channel *channel; - struct device_node *port; + struct device_node *ddc_node; + struct device_node *ep; ret = of_property_read_u32(child, "reg", &i); if (ret || i < 0 || i > 1) @@ -576,33 +582,54 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data) * The output port is port@4 with an external 4-port mux or * port@2 with the internal 2-port mux. */ - port = of_graph_get_port_by_id(child, imx_ldb->lvds_mux ? 4 : 2); - if (port) { - struct device_node *endpoint, *remote; - - endpoint = of_get_child_by_name(port, "endpoint"); - if (endpoint) { - remote = of_graph_get_remote_port_parent(endpoint); - if (remote) - channel->panel = of_drm_find_panel(remote); - else - return -EPROBE_DEFER; - if (!channel->panel) { - dev_err(dev, "panel not found: %s\n", - remote->full_name); - return -EPROBE_DEFER; - } + ep = of_graph_get_endpoint_by_regs(child, + imx_ldb->lvds_mux ? 4 : 2, + -1); + if (ep) { + struct device_node *remote; + + remote = of_graph_get_remote_port_parent(ep); + of_node_put(ep); + if (remote) + channel->panel = of_drm_find_panel(remote); + else + return -EPROBE_DEFER; + of_node_put(remote); + if (!channel->panel) { + dev_err(dev, "panel not found: %s\n", + remote->full_name); + return -EPROBE_DEFER; } } - edidp = of_get_property(child, "edid", &channel->edid_len); - if (edidp) { - channel->edid = kmemdup(edidp, channel->edid_len, - GFP_KERNEL); - } else if (!channel->panel) { - ret = of_get_drm_display_mode(child, &channel->mode, 0); - if (!ret) - channel->mode_valid = 1; + ddc_node = of_parse_phandle(child, "ddc-i2c-bus", 0); + if (ddc_node) { + channel->ddc = of_find_i2c_adapter_by_node(ddc_node); + of_node_put(ddc_node); + if (!channel->ddc) { + dev_warn(dev, "failed to get ddc i2c adapter\n"); + return -EPROBE_DEFER; + } + } + + if (!channel->ddc) { + /* if no DDC available, fallback to hardcoded EDID */ + dev_dbg(dev, "no ddc available\n"); + + edidp = of_get_property(child, "edid", + &channel->edid_len); + if (edidp) { + channel->edid = kmemdup(edidp, + channel->edid_len, + GFP_KERNEL); + } else if (!channel->panel) { + /* fallback to display-timings node */ + ret = of_get_drm_display_mode(child, + &channel->mode, + OF_USE_NATIVE_MODE); + if (!ret) + channel->mode_valid = 1; + } } channel->bus_format = of_get_bus_format(dev, child); @@ -647,6 +674,7 @@ static void imx_ldb_unbind(struct device *dev, struct device *master, channel->encoder.funcs->destroy(&channel->encoder); kfree(channel->edid); + i2c_put_adapter(channel->ddc); } } |