This adds a function that creates a simple connector that has only one
static mode. Additionally add a helper to set &drm_mode_config width
and height from the static mode.
Signed-off-by: Noralf Trønnes <noralf@xxxxxxxxxxx>
---
drivers/gpu/drm/drm_simple_kms_helper.c | 122 ++++++++++++++++++++++++
include/drm/drm_simple_kms_helper.h | 6 ++
2 files changed, 128 insertions(+)
diff --git a/drivers/gpu/drm/drm_simple_kms_helper.c b/drivers/gpu/drm/drm_simple_kms_helper.c
index 917812448d1b..ca29975afefe 100644
--- a/drivers/gpu/drm/drm_simple_kms_helper.c
+++ b/drivers/gpu/drm/drm_simple_kms_helper.c
@@ -11,6 +11,8 @@
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
+#include <drm/drm_device.h>
+#include <drm/drm_modes.h>
#include <drm/drm_plane_helper.h>
#include <drm/drm_simple_kms_helper.h>
#include <linux/slab.h>
@@ -299,4 +301,124 @@ int drm_simple_display_pipe_init(struct drm_device *dev,
}
EXPORT_SYMBOL(drm_simple_display_pipe_init);
+static const struct drm_connector_helper_funcs drm_simple_connector_hfuncs = {
+ /* dummy for the atomic helper */
+};
+
+static int drm_simple_connector_fill_modes(struct drm_connector *connector,
+ uint32_t maxX, uint32_t maxY)
+{
+ return 1;
+}
+
+static void drm_simple_connector_destroy(struct drm_connector *connector)
+{
+ drm_connector_cleanup(connector);
+ kfree(connector);
+}
+
+static const struct drm_connector_funcs drm_simple_connector_funcs = {
+ .reset = drm_atomic_helper_connector_reset,
+ .fill_modes = drm_simple_connector_fill_modes,
+ .destroy = drm_simple_connector_destroy,
+ .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+/**
+ * drm_simple_connector_create - Create a connector with one static mode
+ * @dev: DRM device
+ * @connector_type: Connector type
+ * @mode: Supported display mode
+ * @rotation: Initial @mode rotation in degrees
+ *
+ * This function creates a &drm_connector that has one fixed &drm_display_mode
+ * which will be rotated according to @rotation.
+ *
+ * Returns:
+ * Pointer to connector on success, or ERR_PTR on failure.
+ */
+struct drm_connector *
+drm_simple_connector_create(struct drm_device *dev, int connector_type,
+ const struct drm_display_mode *mode,
+ unsigned int rotation)
+{
+ struct drm_display_mode *mode_dup = NULL;
+ struct drm_connector *connector;
+ int ret;
+
+ connector = kzalloc(sizeof(*connector), GFP_KERNEL);
+ if (!connector)
+ return ERR_PTR(-ENOMEM);
+
+ drm_connector_helper_add(connector, &drm_simple_connector_hfuncs);
+ ret = drm_connector_init(dev, connector, &drm_simple_connector_funcs,
+ connector_type);
+ if (ret)
+ goto err_free;
+
+ connector->status = connector_status_connected;
+
+ mode_dup = drm_mode_duplicate(dev, mode);
+ if (!mode_dup) {
+ ret = -ENOMEM;
+ goto err_cleanup;
+ }
+
+ if (rotation == 90 || rotation == 270) {
+ swap(mode_dup->hdisplay, mode_dup->vdisplay);
+ swap(mode_dup->hsync_start, mode_dup->vsync_start);
+ swap(mode_dup->hsync_end, mode_dup->vsync_end);
+ swap(mode_dup->htotal, mode_dup->vtotal);
+ swap(mode_dup->width_mm, mode_dup->height_mm);
+ } else if (rotation != 0 && rotation != 180) {
+ DRM_ERROR("Illegal rotation value %u\n", rotation);
+ ret = -EINVAL;
+ goto err_cleanup;
+ }
+
+ mode_dup->type |= DRM_MODE_TYPE_PREFERRED;
+ if (mode_dup->name[0] == '\0')
+ drm_mode_set_name(mode_dup);
+
+ list_add(&mode_dup->head, &connector->modes);
+
+ connector->display_info.width_mm = mode_dup->width_mm;
+ connector->display_info.height_mm = mode_dup->height_mm;
+
+ return connector;
+
+err_cleanup:
+ drm_connector_cleanup(connector);
+ drm_mode_destroy(dev, mode_dup);
+err_free:
+ kfree(connector);
+
+ return ERR_PTR(ret);
+}
+EXPORT_SYMBOL(drm_simple_connector_create);
+
+/**
+ * drm_simple_connector_set_mode_config - Set &drm_mode_config width and height
+ * @connector: Connector
+ *
+ * This function sets the &drm_mode_config min/max width and height based on the
+ * connector fixed display mode.
+ */
+void drm_simple_connector_set_mode_config(struct drm_connector *connector)
+{
+ struct drm_mode_config *mode_config = &connector->dev->mode_config;
+ struct drm_display_mode *mode;
+
+ mode = list_first_entry(&connector->modes, struct drm_display_mode, head);
+ if (WARN_ON(!mode))
+ return;
+
+ mode_config->min_width = mode->hdisplay;
+ mode_config->max_width = mode->hdisplay;
+ mode_config->min_height = mode->vdisplay;
+ mode_config->max_height = mode->vdisplay;
+}
+EXPORT_SYMBOL(drm_simple_connector_set_mode_config);
+
MODULE_LICENSE("GPL");
diff --git a/include/drm/drm_simple_kms_helper.h b/include/drm/drm_simple_kms_helper.h
index 451960438a29..ab3d847b7713 100644
--- a/include/drm/drm_simple_kms_helper.h
+++ b/include/drm/drm_simple_kms_helper.h
@@ -182,4 +182,10 @@ int drm_simple_display_pipe_init(struct drm_device *dev,
const uint64_t *format_modifiers,
struct drm_connector *connector);
+struct drm_connector *
+drm_simple_connector_create(struct drm_device *dev, int connector_type,
+ const struct drm_display_mode *mode,
+ unsigned int rotation);
+void drm_simple_connector_set_mode_config(struct drm_connector *connector);
+
#endif /* __LINUX_DRM_SIMPLE_KMS_HELPER_H */
--
2.20.1
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