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| author | Steve Longerbeam <steve_longerbeam@mentor.com> | 2016-04-27 23:23:33 +0300 |
|---|---|---|
| committer | Philipp Zabel <p.zabel@pengutronix.de> | 2016-05-30 10:14:00 +0300 |
| commit | a6d206e28abe468aac5bb589669c6beb855b1a66 (patch) | |
| tree | 9fa0b3ffd71fbff5dfaa95fe554ca933c743ad0f /drivers/gpu/drm/imx/imx-ldb.c | |
| parent | 1a695a905c18548062509178b98bc91e67510864 (diff) | |
| download | linux-a6d206e28abe468aac5bb589669c6beb855b1a66.tar.xz | |
drm/imx: imx-ldb: Add DDC support
Add support for reading EDID over Display Data Channel. If no DDC
adapter is available, falls back to hardcoded EDID or display-timings
node as before.
Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com>
Signed-off-by: Akshay Bhat <akshay.bhat@timesys.com>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Diffstat (limited to 'drivers/gpu/drm/imx/imx-ldb.c')
| -rw-r--r-- | drivers/gpu/drm/imx/imx-ldb.c | 42 |
1 files changed, 34 insertions, 8 deletions
diff --git a/drivers/gpu/drm/imx/imx-ldb.c b/drivers/gpu/drm/imx/imx-ldb.c index a58eee59550a..f506e8dd76cb 100644 --- a/drivers/gpu/drm/imx/imx-ldb.c +++ b/drivers/gpu/drm/imx/imx-ldb.c @@ -59,6 +59,7 @@ 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 +108,9 @@ 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); @@ -553,6 +557,7 @@ 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 *ddc_node; struct device_node *port; ret = of_property_read_u32(child, "reg", &i); @@ -595,14 +600,34 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data) } } - 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, + 0); + if (!ret) + channel->mode_valid = 1; + } } channel->bus_format = of_get_bus_format(dev, child); @@ -647,6 +672,7 @@ 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); } } |