* struct vsp1_dl_manager - Display List manager
* @index: index of the related WPF
* @mode: display list operation mode (header or headerless)
+ * @singleshot: execute the display list in single-shot mode
* @vsp1: the VSP1 device
* @lock: protects the free, active, queued, pending and gc_fragments lists
* @free: array of all free display lists
struct vsp1_dl_manager {
unsigned int index;
enum vsp1_dl_mode mode;
+ bool singleshot;
struct vsp1_device *vsp1;
spinlock_t lock;
static void vsp1_dl_list_fill_header(struct vsp1_dl_list *dl, bool is_last)
{
+ struct vsp1_dl_manager *dlm = dl->dlm;
struct vsp1_dl_header_list *hdr = dl->header->lists;
struct vsp1_dl_body *dlb;
unsigned int num_lists = 0;
dl->header->num_lists = num_lists;
- /*
- * If this display list's chain is not empty, we are on a list, where
- * the next item in the list is the display list entity which should be
- * automatically queued by the hardware.
- */
if (!list_empty(&dl->chain) && !is_last) {
+ /*
+ * If this display list's chain is not empty, we are on a list,
+ * and the next item is the display list that we must queue for
+ * automatic processing by the hardware.
+ */
struct vsp1_dl_list *next = list_next_entry(dl, chain);
dl->header->next_header = next->dma;
dl->header->flags = VSP1_DLH_AUTO_START;
+ } else if (!dlm->singleshot) {
+ /*
+ * if the display list manager works in continuous mode, the VSP
+ * should loop over the display list continuously until
+ * instructed to do otherwise.
+ */
+ dl->header->next_header = dl->dma;
+ dl->header->flags = VSP1_DLH_INT_ENABLE | VSP1_DLH_AUTO_START;
} else {
+ /*
+ * Otherwise, in mem-to-mem mode, we work in single-shot mode
+ * and the next display list must not be started automatically.
+ */
dl->header->flags = VSP1_DLH_INT_ENABLE;
}
}
-void vsp1_dl_list_commit(struct vsp1_dl_list *dl)
+static bool vsp1_dl_list_hw_update_pending(struct vsp1_dl_manager *dlm)
{
- struct vsp1_dl_manager *dlm = dl->dlm;
struct vsp1_device *vsp1 = dlm->vsp1;
- unsigned long flags;
- bool update;
-
- if (dl->dlm->mode == VSP1_DL_MODE_HEADER) {
- struct vsp1_dl_list *dl_child;
-
- /*
- * In header mode the caller guarantees that the hardware is
- * idle at this point.
- */
- /* Fill the header for the head and chained display lists. */
- vsp1_dl_list_fill_header(dl, list_empty(&dl->chain));
-
- list_for_each_entry(dl_child, &dl->chain, chain) {
- bool last = list_is_last(&dl_child->chain, &dl->chain);
+ if (!dlm->queued)
+ return false;
- vsp1_dl_list_fill_header(dl_child, last);
- }
- }
+ /*
+ * Check whether the VSP1 has taken the update. In headerless mode the
+ * hardware indicates this by clearing the UPD bit in the DL_BODY_SIZE
+ * register, and in header mode by clearing the UPDHDR bit in the CMD
+ * register.
+ */
+ if (dlm->mode == VSP1_DL_MODE_HEADERLESS)
+ return !!(vsp1_read(vsp1, VI6_DL_BODY_SIZE)
+ & VI6_DL_BODY_SIZE_UPD);
+ else
+ return !!(vsp1_read(vsp1, VI6_CMD(dlm->index) & VI6_CMD_UPDHDR));
+}
- spin_lock_irqsave(&dlm->lock, flags);
+static void vsp1_dl_list_hw_enqueue(struct vsp1_dl_list *dl)
+{
+ struct vsp1_dl_manager *dlm = dl->dlm;
+ struct vsp1_device *vsp1 = dlm->vsp1;
- if (dl->dlm->mode == VSP1_DL_MODE_HEADER) {
+ if (dlm->mode == VSP1_DL_MODE_HEADERLESS) {
/*
- * Commit the head display list to hardware. Chained headers
- * will auto-start.
+ * In headerless mode, program the hardware directly with the
+ * display list body address and size and set the UPD bit. The
+ * bit will be cleared by the hardware when the display list
+ * processing starts.
+ */
+ vsp1_write(vsp1, VI6_DL_HDR_ADDR(0), dl->body0.dma);
+ vsp1_write(vsp1, VI6_DL_BODY_SIZE, VI6_DL_BODY_SIZE_UPD |
+ (dl->body0.num_entries * sizeof(*dl->header->lists)));
+ } else {
+ /*
+ * In header mode, program the display list header address. If
+ * the hardware is idle (single-shot mode or first frame in
+ * continuous mode) it will then be started independently. If
+ * the hardware is operating, the VI6_DL_HDR_REF_ADDR register
+ * will be updated with the display list address.
*/
vsp1_write(vsp1, VI6_DL_HDR_ADDR(dlm->index), dl->dma);
-
- dlm->active = dl;
- goto done;
}
+}
+
+static void vsp1_dl_list_commit_continuous(struct vsp1_dl_list *dl)
+{
+ struct vsp1_dl_manager *dlm = dl->dlm;
/*
- * Once the UPD bit has been set the hardware can start processing the
- * display list at any time and we can't touch the address and size
- * registers. In that case mark the update as pending, it will be
- * queued up to the hardware by the frame end interrupt handler.
+ * If a previous display list has been queued to the hardware but not
+ * processed yet, the VSP can start processing it at any time. In that
+ * case we can't replace the queued list by the new one, as we could
+ * race with the hardware. We thus mark the update as pending, it will
+ * be queued up to the hardware by the frame end interrupt handler.
*/
- update = !!(vsp1_read(vsp1, VI6_DL_BODY_SIZE) & VI6_DL_BODY_SIZE_UPD);
- if (update) {
+ if (vsp1_dl_list_hw_update_pending(dlm)) {
__vsp1_dl_list_put(dlm->pending);
dlm->pending = dl;
- goto done;
+ return;
}
/*
- * Program the hardware with the display list body address and size.
- * The UPD bit will be cleared by the device when the display list is
- * processed.
+ * Pass the new display list to the hardware and mark it as queued. It
+ * will become active when the hardware starts processing it.
*/
- vsp1_write(vsp1, VI6_DL_HDR_ADDR(0), dl->body0.dma);
- vsp1_write(vsp1, VI6_DL_BODY_SIZE, VI6_DL_BODY_SIZE_UPD |
- (dl->body0.num_entries * sizeof(*dl->header->lists)));
+ vsp1_dl_list_hw_enqueue(dl);
__vsp1_dl_list_put(dlm->queued);
dlm->queued = dl;
+}
+
+static void vsp1_dl_list_commit_singleshot(struct vsp1_dl_list *dl)
+{
+ struct vsp1_dl_manager *dlm = dl->dlm;
+
+ /*
+ * When working in single-shot mode, the caller guarantees that the
+ * hardware is idle at this point. Just commit the head display list
+ * to hardware. Chained lists will be started automatically.
+ */
+ vsp1_dl_list_hw_enqueue(dl);
+
+ dlm->active = dl;
+}
+
+void vsp1_dl_list_commit(struct vsp1_dl_list *dl)
+{
+ struct vsp1_dl_manager *dlm = dl->dlm;
+ struct vsp1_dl_list *dl_child;
+ unsigned long flags;
+
+ if (dlm->mode == VSP1_DL_MODE_HEADER) {
+ /* Fill the header for the head and chained display lists. */
+ vsp1_dl_list_fill_header(dl, list_empty(&dl->chain));
+
+ list_for_each_entry(dl_child, &dl->chain, chain) {
+ bool last = list_is_last(&dl_child->chain, &dl->chain);
+
+ vsp1_dl_list_fill_header(dl_child, last);
+ }
+ }
+
+ spin_lock_irqsave(&dlm->lock, flags);
+
+ if (dlm->singleshot)
+ vsp1_dl_list_commit_singleshot(dl);
+ else
+ vsp1_dl_list_commit_continuous(dl);
-done:
spin_unlock_irqrestore(&dlm->lock, flags);
}
*/
bool vsp1_dlm_irq_frame_end(struct vsp1_dl_manager *dlm)
{
- struct vsp1_device *vsp1 = dlm->vsp1;
bool completed = false;
spin_lock(&dlm->lock);
- __vsp1_dl_list_put(dlm->active);
- dlm->active = NULL;
-
/*
- * Header mode is used for mem-to-mem pipelines only. We don't need to
- * perform any operation as there can't be any new display list queued
- * in that case.
+ * The mem-to-mem pipelines work in single-shot mode. No new display
+ * list can be queued, we don't have to do anything.
*/
- if (dlm->mode == VSP1_DL_MODE_HEADER) {
+ if (dlm->singleshot) {
+ __vsp1_dl_list_put(dlm->active);
+ dlm->active = NULL;
completed = true;
goto done;
}
/*
- * The UPD bit set indicates that the commit operation raced with the
- * interrupt and occurred after the frame end event and UPD clear but
- * before interrupt processing. The hardware hasn't taken the update
- * into account yet, we'll thus skip one frame and retry.
+ * If the commit operation raced with the interrupt and occurred after
+ * the frame end event but before interrupt processing, the hardware
+ * hasn't taken the update into account yet. We have to skip one frame
+ * and retry.
*/
- if (vsp1_read(vsp1, VI6_DL_BODY_SIZE) & VI6_DL_BODY_SIZE_UPD)
+ if (vsp1_dl_list_hw_update_pending(dlm))
goto done;
/*
* frame end interrupt. The display list thus becomes active.
*/
if (dlm->queued) {
+ __vsp1_dl_list_put(dlm->active);
dlm->active = dlm->queued;
dlm->queued = NULL;
completed = true;
}
/*
- * Now that the UPD bit has been cleared we can queue the next display
- * list to the hardware if one has been prepared.
+ * Now that the VSP has started processing the queued display list, we
+ * can queue the pending display list to the hardware if one has been
+ * prepared.
*/
if (dlm->pending) {
- struct vsp1_dl_list *dl = dlm->pending;
-
- vsp1_write(vsp1, VI6_DL_HDR_ADDR(0), dl->body0.dma);
- vsp1_write(vsp1, VI6_DL_BODY_SIZE, VI6_DL_BODY_SIZE_UPD |
- (dl->body0.num_entries *
- sizeof(*dl->header->lists)));
-
- dlm->queued = dl;
+ vsp1_dl_list_hw_enqueue(dlm->pending);
+ dlm->queued = dlm->pending;
dlm->pending = NULL;
}
dlm->index = index;
dlm->mode = index == 0 && !vsp1->info->uapi
? VSP1_DL_MODE_HEADERLESS : VSP1_DL_MODE_HEADER;
+ dlm->singleshot = vsp1->info->uapi;
dlm->vsp1 = vsp1;
spin_lock_init(&dlm->lock);
projects / users / hch / xfs.git / commitdiff