diff options
Diffstat (limited to 'drivers/media/platform/vsp1/vsp1_dl.c')
| -rw-r--r-- | drivers/media/platform/vsp1/vsp1_dl.c | 126 |
1 files changed, 107 insertions, 19 deletions
diff --git a/drivers/media/platform/vsp1/vsp1_dl.c b/drivers/media/platform/vsp1/vsp1_dl.c index 37c3518aa2a8..ad545aff4e35 100644 --- a/drivers/media/platform/vsp1/vsp1_dl.c +++ b/drivers/media/platform/vsp1/vsp1_dl.c @@ -21,7 +21,6 @@ #include "vsp1_dl.h" #define VSP1_DL_NUM_ENTRIES 256 -#define VSP1_DL_NUM_LISTS 3 #define VSP1_DLH_INT_ENABLE (1 << 1) #define VSP1_DLH_AUTO_START (1 << 0) @@ -71,6 +70,7 @@ struct vsp1_dl_body { * @dma: DMA address for the header * @body0: first display list body * @fragments: list of extra display list bodies + * @chain: entry in the display list partition chain */ struct vsp1_dl_list { struct list_head list; @@ -81,6 +81,9 @@ struct vsp1_dl_list { struct vsp1_dl_body body0; struct list_head fragments; + + bool has_chain; + struct list_head chain; }; enum vsp1_dl_mode { @@ -262,7 +265,6 @@ static struct vsp1_dl_list *vsp1_dl_list_alloc(struct vsp1_dl_manager *dlm) memset(dl->header, 0, sizeof(*dl->header)); dl->header->lists[0].addr = dl->body0.dma; - dl->header->flags = VSP1_DLH_INT_ENABLE; } return dl; @@ -293,6 +295,12 @@ struct vsp1_dl_list *vsp1_dl_list_get(struct vsp1_dl_manager *dlm) if (!list_empty(&dlm->free)) { dl = list_first_entry(&dlm->free, struct vsp1_dl_list, list); list_del(&dl->list); + + /* + * The display list chain must be initialised to ensure every + * display list can assert list_empty() if it is not in a chain. + */ + INIT_LIST_HEAD(&dl->chain); } spin_unlock_irqrestore(&dlm->lock, flags); @@ -303,10 +311,24 @@ struct vsp1_dl_list *vsp1_dl_list_get(struct vsp1_dl_manager *dlm) /* This function must be called with the display list manager lock held.*/ static void __vsp1_dl_list_put(struct vsp1_dl_list *dl) { + struct vsp1_dl_list *dl_child; + if (!dl) return; - /* We can't free fragments here as DMA memory can only be freed in + /* + * Release any linked display-lists which were chained for a single + * hardware operation. + */ + if (dl->has_chain) { + list_for_each_entry(dl_child, &dl->chain, chain) + __vsp1_dl_list_put(dl_child); + } + + dl->has_chain = false; + + /* + * We can't free fragments here as DMA memory can only be freed in * interruptible context. Move all fragments to the display list * manager's list of fragments to be freed, they will be * garbage-collected by the work queue. @@ -383,6 +405,76 @@ int vsp1_dl_list_add_fragment(struct vsp1_dl_list *dl, return 0; } +/** + * vsp1_dl_list_add_chain - Add a display list to a chain + * @head: The head display list + * @dl: The new display list + * + * Add a display list to an existing display list chain. The chained lists + * will be automatically processed by the hardware without intervention from + * the CPU. A display list end interrupt will only complete after the last + * display list in the chain has completed processing. + * + * Adding a display list to a chain passes ownership of the display list to + * the head display list item. The chain is released when the head dl item is + * put back with __vsp1_dl_list_put(). + * + * Chained display lists are only usable in header mode. Attempts to add a + * display list to a chain in header-less mode will return an error. + */ +int vsp1_dl_list_add_chain(struct vsp1_dl_list *head, + struct vsp1_dl_list *dl) +{ + /* Chained lists are only available in header mode. */ + if (head->dlm->mode != VSP1_DL_MODE_HEADER) + return -EINVAL; + + head->has_chain = true; + list_add_tail(&dl->chain, &head->chain); + return 0; +} + +static void vsp1_dl_list_fill_header(struct vsp1_dl_list *dl, bool is_last) +{ + struct vsp1_dl_header_list *hdr = dl->header->lists; + struct vsp1_dl_body *dlb; + unsigned int num_lists = 0; + + /* + * Fill the header with the display list bodies addresses and sizes. The + * address of the first body has already been filled when the display + * list was allocated. + */ + + hdr->num_bytes = dl->body0.num_entries + * sizeof(*dl->header->lists); + + list_for_each_entry(dlb, &dl->fragments, list) { + num_lists++; + hdr++; + + hdr->addr = dlb->dma; + hdr->num_bytes = dlb->num_entries + * sizeof(*dl->header->lists); + } + + 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) { + struct vsp1_dl_list *next = list_next_entry(dl, chain); + + dl->header->next_header = next->dma; + dl->header->flags = VSP1_DLH_AUTO_START; + } else { + dl->header->flags = VSP1_DLH_INT_ENABLE; + } +} + void vsp1_dl_list_commit(struct vsp1_dl_list *dl) { struct vsp1_dl_manager *dlm = dl->dlm; @@ -393,30 +485,26 @@ void vsp1_dl_list_commit(struct vsp1_dl_list *dl) spin_lock_irqsave(&dlm->lock, flags); if (dl->dlm->mode == VSP1_DL_MODE_HEADER) { - struct vsp1_dl_header_list *hdr = dl->header->lists; - struct vsp1_dl_body *dlb; - unsigned int num_lists = 0; + struct vsp1_dl_list *dl_child; - /* Fill the header with the display list bodies addresses and - * sizes. The address of the first body has already been filled - * when the display list was allocated. - * + /* * In header mode the caller guarantees that the hardware is * idle at this point. */ - hdr->num_bytes = dl->body0.num_entries - * sizeof(*dl->header->lists); - list_for_each_entry(dlb, &dl->fragments, list) { - num_lists++; - hdr++; + /* Fill the header for the head and chained display lists. */ + vsp1_dl_list_fill_header(dl, list_empty(&dl->chain)); - hdr->addr = dlb->dma; - hdr->num_bytes = dlb->num_entries - * sizeof(*dl->header->lists); + 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); } - dl->header->num_lists = num_lists; + /* + * Commit the head display list to hardware. Chained headers + * will auto-start. + */ vsp1_write(vsp1, VI6_DL_HDR_ADDR(dlm->index), dl->dma); dlm->active = dl; |