summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c')
-rw-r--r--drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c234
1 files changed, 234 insertions, 0 deletions
diff --git a/drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c b/drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c
new file mode 100644
index 000000000000..ec43fb7ad9e4
--- /dev/null
+++ b/drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c
@@ -0,0 +1,234 @@
+/*
+ * Copyright (C) 2016 Noralf Trønnes
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_modes.h>
+#include <drm/tinydrm/tinydrm.h>
+
+struct tinydrm_connector {
+ struct drm_connector base;
+ const struct drm_display_mode *mode;
+};
+
+static inline struct tinydrm_connector *
+to_tinydrm_connector(struct drm_connector *connector)
+{
+ return container_of(connector, struct tinydrm_connector, base);
+}
+
+static int tinydrm_connector_get_modes(struct drm_connector *connector)
+{
+ struct tinydrm_connector *tconn = to_tinydrm_connector(connector);
+ struct drm_display_mode *mode;
+
+ mode = drm_mode_duplicate(connector->dev, tconn->mode);
+ if (!mode) {
+ DRM_ERROR("Failed to duplicate mode\n");
+ return 0;
+ }
+
+ if (mode->name[0] == '\0')
+ drm_mode_set_name(mode);
+
+ mode->type |= DRM_MODE_TYPE_PREFERRED;
+ drm_mode_probed_add(connector, mode);
+
+ if (mode->width_mm) {
+ connector->display_info.width_mm = mode->width_mm;
+ connector->display_info.height_mm = mode->height_mm;
+ }
+
+ return 1;
+}
+
+static const struct drm_connector_helper_funcs tinydrm_connector_hfuncs = {
+ .get_modes = tinydrm_connector_get_modes,
+ .best_encoder = drm_atomic_helper_best_encoder,
+};
+
+static enum drm_connector_status
+tinydrm_connector_detect(struct drm_connector *connector, bool force)
+{
+ if (drm_device_is_unplugged(connector->dev))
+ return connector_status_disconnected;
+
+ return connector->status;
+}
+
+static void tinydrm_connector_destroy(struct drm_connector *connector)
+{
+ struct tinydrm_connector *tconn = to_tinydrm_connector(connector);
+
+ drm_connector_cleanup(connector);
+ kfree(tconn);
+}
+
+static const struct drm_connector_funcs tinydrm_connector_funcs = {
+ .dpms = drm_atomic_helper_connector_dpms,
+ .reset = drm_atomic_helper_connector_reset,
+ .detect = tinydrm_connector_detect,
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .destroy = tinydrm_connector_destroy,
+ .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+struct drm_connector *
+tinydrm_connector_create(struct drm_device *drm,
+ const struct drm_display_mode *mode,
+ int connector_type)
+{
+ struct tinydrm_connector *tconn;
+ struct drm_connector *connector;
+ int ret;
+
+ tconn = kzalloc(sizeof(*tconn), GFP_KERNEL);
+ if (!tconn)
+ return ERR_PTR(-ENOMEM);
+
+ tconn->mode = mode;
+ connector = &tconn->base;
+
+ drm_connector_helper_add(connector, &tinydrm_connector_hfuncs);
+ ret = drm_connector_init(drm, connector, &tinydrm_connector_funcs,
+ connector_type);
+ if (ret) {
+ kfree(tconn);
+ return ERR_PTR(ret);
+ }
+
+ connector->status = connector_status_connected;
+
+ return connector;
+}
+
+/**
+ * tinydrm_display_pipe_update - Display pipe update helper
+ * @pipe: Simple display pipe
+ * @old_state: Old plane state
+ *
+ * This function does a full framebuffer flush if the plane framebuffer
+ * has changed. It also handles vblank events. Drivers can use this as their
+ * &drm_simple_display_pipe_funcs->update callback.
+ */
+void tinydrm_display_pipe_update(struct drm_simple_display_pipe *pipe,
+ struct drm_plane_state *old_state)
+{
+ struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);
+ struct drm_framebuffer *fb = pipe->plane.state->fb;
+ struct drm_crtc *crtc = &tdev->pipe.crtc;
+
+ if (fb && (fb != old_state->fb)) {
+ pipe->plane.fb = fb;
+ if (fb->funcs->dirty)
+ fb->funcs->dirty(fb, NULL, 0, 0, NULL, 0);
+ }
+
+ if (crtc->state->event) {
+ spin_lock_irq(&crtc->dev->event_lock);
+ drm_crtc_send_vblank_event(crtc, crtc->state->event);
+ spin_unlock_irq(&crtc->dev->event_lock);
+ crtc->state->event = NULL;
+ }
+}
+EXPORT_SYMBOL(tinydrm_display_pipe_update);
+
+/**
+ * tinydrm_display_pipe_prepare_fb - Display pipe prepare_fb helper
+ * @pipe: Simple display pipe
+ * @plane_state: Plane state
+ *
+ * This function uses drm_fb_cma_prepare_fb() to check if the plane FB has an
+ * dma-buf attached, extracts the exclusive fence and attaches it to plane
+ * state for the atomic helper to wait on. Drivers can use this as their
+ * &drm_simple_display_pipe_funcs->prepare_fb callback.
+ */
+int tinydrm_display_pipe_prepare_fb(struct drm_simple_display_pipe *pipe,
+ struct drm_plane_state *plane_state)
+{
+ return drm_fb_cma_prepare_fb(&pipe->plane, plane_state);
+}
+EXPORT_SYMBOL(tinydrm_display_pipe_prepare_fb);
+
+static int tinydrm_rotate_mode(struct drm_display_mode *mode,
+ unsigned int rotation)
+{
+ if (rotation == 0 || rotation == 180) {
+ return 0;
+ } else if (rotation == 90 || rotation == 270) {
+ swap(mode->hdisplay, mode->vdisplay);
+ swap(mode->hsync_start, mode->vsync_start);
+ swap(mode->hsync_end, mode->vsync_end);
+ swap(mode->htotal, mode->vtotal);
+ swap(mode->width_mm, mode->height_mm);
+ return 0;
+ } else {
+ return -EINVAL;
+ }
+}
+
+/**
+ * tinydrm_display_pipe_init - Initialize display pipe
+ * @tdev: tinydrm device
+ * @funcs: Display pipe functions
+ * @connector_type: Connector type
+ * @formats: Array of supported formats (DRM_FORMAT\_\*)
+ * @format_count: Number of elements in @formats
+ * @mode: Supported mode
+ * @rotation: Initial @mode rotation in degrees Counter Clock Wise
+ *
+ * This function sets up a &drm_simple_display_pipe with a &drm_connector that
+ * has one fixed &drm_display_mode which is rotated according to @rotation.
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+int
+tinydrm_display_pipe_init(struct tinydrm_device *tdev,
+ const struct drm_simple_display_pipe_funcs *funcs,
+ int connector_type,
+ const uint32_t *formats,
+ unsigned int format_count,
+ const struct drm_display_mode *mode,
+ unsigned int rotation)
+{
+ struct drm_device *drm = tdev->drm;
+ struct drm_display_mode *mode_copy;
+ struct drm_connector *connector;
+ int ret;
+
+ mode_copy = devm_kmalloc(drm->dev, sizeof(*mode_copy), GFP_KERNEL);
+ if (!mode_copy)
+ return -ENOMEM;
+
+ *mode_copy = *mode;
+ ret = tinydrm_rotate_mode(mode_copy, rotation);
+ if (ret) {
+ DRM_ERROR("Illegal rotation value %u\n", rotation);
+ return -EINVAL;
+ }
+
+ drm->mode_config.min_width = mode_copy->hdisplay;
+ drm->mode_config.max_width = mode_copy->hdisplay;
+ drm->mode_config.min_height = mode_copy->vdisplay;
+ drm->mode_config.max_height = mode_copy->vdisplay;
+
+ connector = tinydrm_connector_create(drm, mode_copy, connector_type);
+ if (IS_ERR(connector))
+ return PTR_ERR(connector);
+
+ ret = drm_simple_display_pipe_init(drm, &tdev->pipe, funcs, formats,
+ format_count, connector);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+EXPORT_SYMBOL(tinydrm_display_pipe_init);