diff options
| -rw-r--r-- | drivers/gpu/drm/sun4i/sun4i_tcon.c | 51 |
1 files changed, 49 insertions, 2 deletions
diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c index 9bfb5b967d38..8b3ca1e83f26 100644 --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c @@ -36,6 +36,7 @@ #include "sun4i_rgb.h" #include "sun4i_tcon.h" #include "sun6i_mipi_dsi.h" +#include "sun8i_tcon_top.h" #include "sunxi_engine.h" static struct drm_connector *sun4i_tcon_get_connector(const struct drm_encoder *encoder) @@ -908,6 +909,36 @@ static struct sunxi_engine *sun4i_tcon_get_engine_by_id(struct sun4i_drv *drv, return ERR_PTR(-EINVAL); } +static bool sun4i_tcon_connected_to_tcon_top(struct device_node *node) +{ + struct device_node *remote; + bool ret = false; + + remote = of_graph_get_remote_node(node, 0, -1); + if (remote) { + ret = !!of_match_node(sun8i_tcon_top_of_table, remote); + of_node_put(remote); + } + + return ret; +} + +static int sun4i_tcon_get_index(struct sun4i_drv *drv) +{ + struct list_head *pos; + int size = 0; + + /* + * Because TCON is added to the list at the end of the probe + * (after this function is called), index of the current TCON + * will be same as current TCON list size. + */ + list_for_each(pos, &drv->tcon_list) + ++size; + + return size; +} + /* * On SoCs with the old display pipeline design (Display Engine 1.0), * we assumed the TCON was always tied to just one backend. However @@ -956,8 +987,24 @@ static struct sunxi_engine *sun4i_tcon_find_engine(struct sun4i_drv *drv, * connections between the backend and TCON? */ if (of_get_child_count(port) > 1) { - /* Get our ID directly from an upstream endpoint */ - int id = sun4i_tcon_of_get_id_from_port(port); + int id; + + /* + * When pipeline has the same number of TCONs and engines which + * are represented by frontends/backends (DE1) or mixers (DE2), + * we match them by their respective IDs. However, if pipeline + * contains TCON TOP, chances are that there are either more + * TCONs than engines (R40) or TCONs with non-consecutive ids. + * (H6). In that case it's easier just use TCON index in list + * as an id. That means that on R40, any 2 TCONs can be enabled + * in DT out of 4 (there are 2 mixers). Due to the design of + * TCON TOP, remaining 2 TCONs can't be connected to anything + * anyway. + */ + if (sun4i_tcon_connected_to_tcon_top(node)) + id = sun4i_tcon_get_index(drv); + else + id = sun4i_tcon_of_get_id_from_port(port); /* Get our engine by matching our ID */ engine = sun4i_tcon_get_engine_by_id(drv, id); |