drm/vmwgfx: Add and connect CRTC helper functions

Atomic mode set requires us to refactor existing vmw_stdu_crtc_set_config
code into sections that check the validity of the new mode, and sections
that actually program the hardware state.

vmw_du_crtc_atomic_check() takes CRTC-related checking code.  In a later
patch, vmw_du_primary_plane_atomic_check() will take framebuffer-related
checking code.

These helpers won't be called until we flip on the atomic support
flag or set drm_crtc_funcs->set_config to using the atomic
helper.

v2:
* The state->num_connector is actually the total number of potential
  connectors, not just the one associated with the display unit.
  The proper one to check is ->connector_mask.

* Add the check to only allow plane state to be the same as crtc state
  (Thanks to mlankhorst)

* Make sure to turn on SVGA mode before using VRAM.  SVGA mode is
  disabled in master_drop if dbdev is not running.

v3:
* Moved dot clock override to crtc_atomic_check

Signed-off-by: Sinclair Yeh <syeh@vmware.com>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Acked-by: Daniel Vetter <daniel@ffwll.ch>

1 files changed, 79 insertions, 0 deletions

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c b/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c
index 276c7440b8b1..d547e8061f6a 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c
@@ -167,6 +167,7 @@ static int vmw_ldu_add_active(struct vmw_private *vmw_priv,
 	if (vfb != ld->fb) {
 		if (ld->fb && ld->fb->unpin)
 			ld->fb->unpin(ld->fb);
+		vmw_svga_enable(vmw_priv);
 		if (vfb->pin)
 			vfb->pin(vfb);
 		ld->fb = vfb;
@@ -190,6 +191,68 @@ static int vmw_ldu_add_active(struct vmw_private *vmw_priv,
 	return 0;
 }
 
+/**
+ * vmw_ldu_crtc_mode_set_nofb - Enable svga
+ *
+ * @crtc: CRTC associated with the new screen
+ *
+ * For LDU, just enable the svga
+ */
+static void vmw_ldu_crtc_mode_set_nofb(struct drm_crtc *crtc)
+{
+}
+
+/**
+ * vmw_ldu_crtc_helper_prepare - Noop
+ *
+ * @crtc: CRTC associated with the new screen
+ *
+ * Prepares the CRTC for a mode set, but we don't need to do anything here.
+ *
+ */
+static void vmw_ldu_crtc_helper_prepare(struct drm_crtc *crtc)
+{
+}
+
+/**
+ * vmw_ldu_crtc_helper_commit - Noop
+ *
+ * @crtc: CRTC associated with the new screen
+ *
+ * This is called after a mode set has been completed.  Here's
+ * usually a good place to call vmw_ldu_add_active/vmw_ldu_del_active
+ * but since for LDU the display plane is closely tied to the
+ * CRTC, it makes more sense to do those at plane update time.
+ */
+static void vmw_ldu_crtc_helper_commit(struct drm_crtc *crtc)
+{
+	struct vmw_private *dev_priv;
+	struct vmw_legacy_display_unit *ldu;
+	struct vmw_framebuffer *vfb;
+	struct drm_framebuffer *fb;
+
+
+	ldu = vmw_crtc_to_ldu(crtc);
+	dev_priv = vmw_priv(crtc->dev);
+	fb       = crtc->primary->fb;
+
+	vfb = (fb) ? vmw_framebuffer_to_vfb(fb) : NULL;
+
+	if (vfb)
+		vmw_ldu_add_active(dev_priv, ldu, vfb);
+	else
+		vmw_ldu_del_active(dev_priv, ldu);
+}
+
+/**
+ * vmw_ldu_crtc_helper_disable - Turns off CRTC
+ *
+ * @crtc: CRTC to be turned off
+ */
+static void vmw_ldu_crtc_helper_disable(struct drm_crtc *crtc)
+{
+}
+
 static int vmw_ldu_crtc_set_config(struct drm_mode_set *set)
 {
 	struct vmw_private *dev_priv;
@@ -346,6 +409,20 @@ static const struct drm_plane_funcs vmw_ldu_cursor_funcs = {
 	.atomic_destroy_state = vmw_du_plane_destroy_state,
 };
 
+/*
+ * Atomic Helpers
+ */
+static const struct drm_crtc_helper_funcs vmw_ldu_crtc_helper_funcs = {
+	.prepare = vmw_ldu_crtc_helper_prepare,
+	.commit = vmw_ldu_crtc_helper_commit,
+	.disable = vmw_ldu_crtc_helper_disable,
+	.mode_set = drm_helper_crtc_mode_set,
+	.mode_set_nofb = vmw_ldu_crtc_mode_set_nofb,
+	.atomic_check = vmw_du_crtc_atomic_check,
+	.atomic_begin = vmw_du_crtc_atomic_begin,
+	.atomic_flush = vmw_du_crtc_atomic_flush,
+};
+
 
 static int vmw_ldu_init(struct vmw_private *dev_priv, unsigned unit)
 {
@@ -445,6 +522,8 @@ static int vmw_ldu_init(struct vmw_private *dev_priv, unsigned unit)
 		goto err_free_unregister;
 	}
 
+	drm_crtc_helper_add(crtc, &vmw_ldu_crtc_helper_funcs);
+
 	drm_mode_crtc_set_gamma_size(crtc, 256);
 
 	drm_object_attach_property(&connector->base,