drm/tegra: Implement page-flipping support
All the necessary support bits like .mode_set_base() and VBLANK are now
available, so page-flipping case easily be implemented on top.
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
index 5f55a25..c5d825f 100644
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -183,7 +183,72 @@
spin_unlock_irqrestore(&dc->lock, flags);
}
+static void tegra_dc_finish_page_flip(struct tegra_dc *dc)
+{
+ struct drm_device *drm = dc->base.dev;
+ struct drm_crtc *crtc = &dc->base;
+ struct drm_gem_cma_object *gem;
+ unsigned long flags, base;
+
+ if (!dc->event)
+ return;
+
+ gem = drm_fb_cma_get_gem_obj(crtc->fb, 0);
+
+ /* check if new start address has been latched */
+ tegra_dc_writel(dc, READ_MUX, DC_CMD_STATE_ACCESS);
+ base = tegra_dc_readl(dc, DC_WINBUF_START_ADDR);
+ tegra_dc_writel(dc, 0, DC_CMD_STATE_ACCESS);
+
+ if (base == gem->paddr + crtc->fb->offsets[0]) {
+ spin_lock_irqsave(&drm->event_lock, flags);
+ drm_send_vblank_event(drm, dc->pipe, dc->event);
+ drm_vblank_put(drm, dc->pipe);
+ dc->event = NULL;
+ spin_unlock_irqrestore(&drm->event_lock, flags);
+ }
+}
+
+void tegra_dc_cancel_page_flip(struct drm_crtc *crtc, struct drm_file *file)
+{
+ struct tegra_dc *dc = to_tegra_dc(crtc);
+ struct drm_device *drm = crtc->dev;
+ unsigned long flags;
+
+ spin_lock_irqsave(&drm->event_lock, flags);
+
+ if (dc->event && dc->event->base.file_priv == file) {
+ dc->event->base.destroy(&dc->event->base);
+ drm_vblank_put(drm, dc->pipe);
+ dc->event = NULL;
+ }
+
+ spin_unlock_irqrestore(&drm->event_lock, flags);
+}
+
+static int tegra_dc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
+ struct drm_pending_vblank_event *event)
+{
+ struct tegra_dc *dc = to_tegra_dc(crtc);
+ struct drm_device *drm = crtc->dev;
+
+ if (dc->event)
+ return -EBUSY;
+
+ if (event) {
+ event->pipe = dc->pipe;
+ dc->event = event;
+ drm_vblank_get(drm, dc->pipe);
+ }
+
+ tegra_dc_set_base(dc, 0, 0, fb);
+ crtc->fb = fb;
+
+ return 0;
+}
+
static const struct drm_crtc_funcs tegra_crtc_funcs = {
+ .page_flip = tegra_dc_page_flip,
.set_config = drm_crtc_helper_set_config,
.destroy = drm_crtc_cleanup,
};
@@ -665,6 +730,7 @@
dev_dbg(dc->dev, "%s(): vertical blank\n", __func__);
*/
drm_handle_vblank(dc->base.dev, dc->pipe);
+ tegra_dc_finish_page_flip(dc);
}
if (status & (WIN_A_UF_INT | WIN_B_UF_INT | WIN_C_UF_INT)) {