[media] coda: add bitstream ringbuffer handling for decoder

Add a bitstream ringbuffer using kfifo. Queued source buffers are to be copied
into the bitstream ringbuffer immediately and marked as done, if possible.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Kamil Debski <k.debski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

diff --git a/drivers/media/platform/coda.c b/drivers/media/platform/coda.c
index 5aafc7c..424dd5f 100644 (file)
--- a/drivers/media/platform/coda.c
+++ b/drivers/media/platform/coda.c
@@ -18,6 +18,7 @@
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/irq.h>
+#include <linux/kfifo.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
@@ -182,6 +183,7 @@ struct coda_ctx {
        int                             streamon_out;
        int                             streamon_cap;
        u32                             isequence;
+       u32                             qsequence;
        struct coda_q_data              q_data[2];
        enum coda_inst_type             inst_type;
        struct coda_codec               *codec;
@@ -193,6 +195,9 @@ struct coda_ctx {
        int                             gopcounter;
        char                            vpu_header[3][64];
        int                             vpu_header_size[3];
+       struct kfifo                    bitstream_fifo;
+       struct mutex                    bitstream_mutex;
+       struct coda_aux_buf             bitstream;
        struct coda_aux_buf             parabuf;
        struct coda_aux_buf             internal_frames[CODA_MAX_FRAMEBUFFERS];
        struct coda_aux_buf             workbuf;
@@ -200,6 +205,7 @@ struct coda_ctx {
        int                             idx;
        int                             reg_idx;
        struct coda_iram_info           iram_info;
+       u32                             bit_stream_param;
 };
 
 static const u8 coda_filler_nal[14] = { 0x00, 0x00, 0x00, 0x01, 0x0c, 0xff,
@@ -249,6 +255,8 @@ static void coda_command_async(struct coda_ctx *ctx, int cmd)
 
        if (dev->devtype->product == CODA_7541) {
                /* Restore context related registers to CODA */
+               coda_write(dev, ctx->bit_stream_param,
+                               CODA_REG_BIT_BIT_STREAM_PARAM);
                coda_write(dev, ctx->workbuf.paddr, CODA_REG_BIT_WORK_BUF_ADDR);
        }
 
@@ -692,6 +700,105 @@ static const struct v4l2_ioctl_ops coda_ioctl_ops = {
        .vidioc_streamoff       = vidioc_streamoff,
 };
 
+static inline int coda_get_bitstream_payload(struct coda_ctx *ctx)
+{
+       return kfifo_len(&ctx->bitstream_fifo);
+}
+
+static void coda_kfifo_sync_from_device(struct coda_ctx *ctx)
+{
+       struct __kfifo *kfifo = &ctx->bitstream_fifo.kfifo;
+       struct coda_dev *dev = ctx->dev;
+       u32 rd_ptr;
+
+       rd_ptr = coda_read(dev, CODA_REG_BIT_RD_PTR(ctx->reg_idx));
+       kfifo->out = (kfifo->in & ~kfifo->mask) |
+                     (rd_ptr - ctx->bitstream.paddr);
+       if (kfifo->out > kfifo->in)
+               kfifo->out -= kfifo->mask + 1;
+}
+
+static void coda_kfifo_sync_to_device_full(struct coda_ctx *ctx)
+{
+       struct __kfifo *kfifo = &ctx->bitstream_fifo.kfifo;
+       struct coda_dev *dev = ctx->dev;
+       u32 rd_ptr, wr_ptr;
+
+       rd_ptr = ctx->bitstream.paddr + (kfifo->out & kfifo->mask);
+       coda_write(dev, rd_ptr, CODA_REG_BIT_RD_PTR(ctx->reg_idx));
+       wr_ptr = ctx->bitstream.paddr + (kfifo->in & kfifo->mask);
+       coda_write(dev, wr_ptr, CODA_REG_BIT_WR_PTR(ctx->reg_idx));
+}
+
+static void coda_kfifo_sync_to_device_write(struct coda_ctx *ctx)
+{
+       struct __kfifo *kfifo = &ctx->bitstream_fifo.kfifo;
+       struct coda_dev *dev = ctx->dev;
+       u32 wr_ptr;
+
+       wr_ptr = ctx->bitstream.paddr + (kfifo->in & kfifo->mask);
+       coda_write(dev, wr_ptr, CODA_REG_BIT_WR_PTR(ctx->reg_idx));
+}
+
+static int coda_bitstream_queue(struct coda_ctx *ctx, struct vb2_buffer *src_buf)
+{
+       u32 src_size = vb2_get_plane_payload(src_buf, 0);
+       u32 n;
+
+       n = kfifo_in(&ctx->bitstream_fifo, vb2_plane_vaddr(src_buf, 0), src_size);
+       if (n < src_size)
+               return -ENOSPC;
+
+       dma_sync_single_for_device(&ctx->dev->plat_dev->dev, ctx->bitstream.paddr,
+                                  ctx->bitstream.size, DMA_TO_DEVICE);
+
+       ctx->qsequence++;
+
+       return 0;
+}
+
+static bool coda_bitstream_try_queue(struct coda_ctx *ctx,
+                                    struct vb2_buffer *src_buf)
+{
+       int ret;
+
+       if (coda_get_bitstream_payload(ctx) +
+           vb2_get_plane_payload(src_buf, 0) + 512 >= ctx->bitstream.size)
+               return false;
+
+       if (vb2_plane_vaddr(src_buf, 0) == NULL) {
+               v4l2_err(&ctx->dev->v4l2_dev, "trying to queue empty buffer\n");
+               return true;
+       }
+
+       ret = coda_bitstream_queue(ctx, src_buf);
+       if (ret < 0) {
+               v4l2_err(&ctx->dev->v4l2_dev, "bitstream buffer overflow\n");
+               return false;
+       }
+       /* Sync read pointer to device */
+       if (ctx == v4l2_m2m_get_curr_priv(ctx->dev->m2m_dev))
+               coda_kfifo_sync_to_device_write(ctx);
+
+       return true;
+}
+
+static void coda_fill_bitstream(struct coda_ctx *ctx)
+{
+       struct vb2_buffer *src_buf;
+
+       while (v4l2_m2m_num_src_bufs_ready(ctx->m2m_ctx) > 0) {
+               src_buf = v4l2_m2m_next_src_buf(ctx->m2m_ctx);
+
+               if (coda_bitstream_try_queue(ctx, src_buf)) {
+                       src_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx);
+                       v4l2_m2m_buf_done(src_buf, VB2_BUF_STATE_DONE);
+               } else {
+                       break;
+               }
+       }
+}
+
 /*
  * Mem-to-mem operations.
  */
@@ -842,15 +949,22 @@ static int coda_job_ready(void *m2m_priv)
 
        /*
         * For both 'P' and 'key' frame cases 1 picture
-        * and 1 frame are needed.
+        * and 1 frame are needed. In the decoder case,
+        * the compressed frame can be in the bitstream.
         */
-       if (!v4l2_m2m_num_src_bufs_ready(ctx->m2m_ctx) ||
-               !v4l2_m2m_num_dst_bufs_ready(ctx->m2m_ctx)) {
+       if (!v4l2_m2m_num_src_bufs_ready(ctx->m2m_ctx) &&
+           ctx->inst_type != CODA_INST_DECODER) {
                v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
                         "not ready: not enough video buffers.\n");
                return 0;
        }
 
+       if (!v4l2_m2m_num_dst_bufs_ready(ctx->m2m_ctx)) {
+               v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
+                        "not ready: not enough video capture buffers.\n");
+               return 0;
+       }
+
        if (ctx->aborting) {
                v4l2_dbg(1, coda_debug, &ctx->dev->v4l2_dev,
                         "not ready: aborting\n");
@@ -1785,6 +1899,18 @@ static int coda_open(struct file *file)
                goto err;
        }
 
+       ctx->bitstream.size = CODA_MAX_FRAME_SIZE;
+       ctx->bitstream.vaddr = dma_alloc_writecombine(&dev->plat_dev->dev,
+                       ctx->bitstream.size, &ctx->bitstream.paddr, GFP_KERNEL);
+       if (!ctx->bitstream.vaddr) {
+               v4l2_err(&dev->v4l2_dev, "failed to allocate bitstream ringbuffer");
+               ret = -ENOMEM;
+               goto err;
+       }
+       kfifo_init(&ctx->bitstream_fifo,
+               ctx->bitstream.vaddr, ctx->bitstream.size);
+       mutex_init(&ctx->bitstream_mutex);
+
        coda_lock(ctx);
        list_add(&ctx->list, &dev->instances);
        coda_unlock(ctx);
@@ -1816,6 +1942,8 @@ static int coda_release(struct file *file)
        list_del(&ctx->list);
        coda_unlock(ctx);
 
+       dma_free_writecombine(&dev->plat_dev->dev, ctx->bitstream.size,
+               ctx->bitstream.vaddr, ctx->bitstream.paddr);
        coda_free_context_buffers(ctx);
        if (ctx->dev->devtype->product == CODA_DX6)
                coda_free_aux_buf(dev, &ctx->workbuf);

diff --git a/drivers/media/platform/coda.h b/drivers/media/platform/coda.h
index b2b5b1d..140eea5 100644 (file)
--- a/drivers/media/platform/coda.h
+++ b/drivers/media/platform/coda.h
@@ -43,6 +43,9 @@
 #define                CODA_STREAM_ENDIAN_SELECT       (1 << 0)
 #define CODA_REG_BIT_FRAME_MEM_CTRL            0x110
 #define                CODA_IMAGE_ENDIAN_SELECT        (1 << 0)
+#define CODA_REG_BIT_BIT_STREAM_PARAM          0x114
+#define                CODA_BIT_STREAM_END_FLAG        (1 << 2)
+#define                CODA_BIT_DEC_SEQ_INIT_ESCAPE    (1 << 0)
 #define CODA_REG_BIT_TEMP_BUF_ADDR             0x118
 #define CODA_REG_BIT_RD_PTR(x)                 (0x120 + 8 * (x))
 #define CODA_REG_BIT_WR_PTR(x)                 (0x124 + 8 * (x))