> From: Jaeryul Oh [mailto:jaeryul.oh@xxxxxxxxxxx] > > Kamil, I have a question about MFC state FINISHING & FINISHED as below. Hi Peter, I have answered your question below. > > > > -----Original Message----- > > From: linux-media-owner@xxxxxxxxxxxxxxx [mailto:linux-media- > > owner@xxxxxxxxxxxxxxx] On Behalf Of Kamil Debski > > Sent: Saturday, January 08, 2011 1:26 AM > > To: linux-media@xxxxxxxxxxxxxxx; linux-samsung-soc@xxxxxxxxxxxxxxx > > Cc: m.szyprowski@xxxxxxxxxxx; pawel@xxxxxxxxxx; > kyungmin.park@xxxxxxxxxxx; > > k.debski@xxxxxxxxxxx; jaeryul.oh@xxxxxxxxxxx; kgene.kim@xxxxxxxxxxx > > Subject: [RFC/PATCH v6 3/4] MFC: Add MFC 5.1 V4L2 driver > > > > Multi Format Codec 5.1 is capable of handling a range of video codecs > > and this driver provides V4L2 interface for video decoding. > > > > Signed-off-by: Kamil Debski <k.debski@xxxxxxxxxxx> > > Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx> > > --- > > drivers/media/video/Kconfig | 8 + > > drivers/media/video/Makefile | 1 + > > drivers/media/video/s5p-mfc/Makefile | 3 + > > drivers/media/video/s5p-mfc/regs-mfc5.h | 335 +++++ > > drivers/media/video/s5p-mfc/s5p_mfc.c | 2072 > > ++++++++++++++++++++++++++ > > drivers/media/video/s5p-mfc/s5p_mfc_common.h | 224 +++ > > drivers/media/video/s5p-mfc/s5p_mfc_ctrls.h | 173 +++ > > drivers/media/video/s5p-mfc/s5p_mfc_debug.h | 47 + > > drivers/media/video/s5p-mfc/s5p_mfc_intr.c | 92 ++ > > drivers/media/video/s5p-mfc/s5p_mfc_intr.h | 26 + > > drivers/media/video/s5p-mfc/s5p_mfc_memory.h | 43 + > > drivers/media/video/s5p-mfc/s5p_mfc_opr.c | 885 +++++++++++ > > drivers/media/video/s5p-mfc/s5p_mfc_opr.h | 160 ++ > > 13 files changed, 4069 insertions(+), 0 deletions(-) > > create mode 100644 drivers/media/video/s5p-mfc/Makefile > > create mode 100644 drivers/media/video/s5p-mfc/regs-mfc5.h > > create mode 100644 drivers/media/video/s5p-mfc/s5p_mfc.c > > create mode 100644 drivers/media/video/s5p-mfc/s5p_mfc_common.h > > create mode 100644 drivers/media/video/s5p-mfc/s5p_mfc_ctrls.h > > create mode 100644 drivers/media/video/s5p-mfc/s5p_mfc_debug.h > > create mode 100644 drivers/media/video/s5p-mfc/s5p_mfc_intr.c > > create mode 100644 drivers/media/video/s5p-mfc/s5p_mfc_intr.h > > create mode 100644 drivers/media/video/s5p-mfc/s5p_mfc_memory.h > > create mode 100644 drivers/media/video/s5p-mfc/s5p_mfc_opr.c > > create mode 100644 drivers/media/video/s5p-mfc/s5p_mfc_opr.h > > > > Snipped... > > +/* Videobuf opts */ > > +static struct vb2_ops s5p_mfc_qops = { > > + .buf_queue = s5p_mfc_buf_queue, > > + .queue_setup = s5p_mfc_queue_setup, > > + .start_streaming = s5p_mfc_start_streaming, > > + .buf_init = s5p_mfc_buf_init, > > + .stop_streaming = s5p_mfc_stop_streaming, > > + .wait_prepare = s5p_mfc_unlock, > > + .wait_finish = s5p_mfc_lock, > > +}; > > + > > +static void s5p_mfc_handle_frame_all_extracted(struct s5p_mfc_ctx > *ctx) > > +{ > > + struct s5p_mfc_dev *dev = ctx->dev; > > + struct s5p_mfc_buf *dst_buf; > > + > > + ctx->state = MFCINST_DEC_FINISHED; > > + mfc_debug("Decided to finish\n"); > > + ctx->sequence++; > > + while (!list_empty(&ctx->dst_queue)) { > > + dst_buf = list_entry(ctx->dst_queue.next, > > + struct s5p_mfc_buf, list); > > + mfc_debug("Cleaning up buffer: %d\n", > > + dst_buf->b->v4l2_buf.index); > > + vb2_set_plane_payload(dst_buf->b, 0, 0); > > + vb2_set_plane_payload(dst_buf->b, 1, 0); > > + list_del(&dst_buf->list); > > + ctx->dst_queue_cnt--; > > + dst_buf->b->v4l2_buf.sequence = (ctx->sequence++); > > + if (s5p_mfc_get_pic_time_top(ctx) == > > + s5p_mfc_get_pic_time_bottom(ctx)) > > + dst_buf->b->v4l2_buf.field = V4L2_FIELD_NONE; > > + else > > + dst_buf->b->v4l2_buf.field = > > + V4L2_FIELD_INTERLACED; > > + ctx->dec_dst_flag &= ~(1 << dst_buf->b->v4l2_buf.index); > > + vb2_buffer_done(dst_buf->b, VB2_BUF_STATE_DONE); > > + mfc_debug("Cleaned up buffer: %d\n", > > + dst_buf->b->v4l2_buf.index); > > + } > > + mfc_debug("After cleanup\n"); > > +} > > + > > +static void s5p_mfc_handle_frame_new(struct s5p_mfc_ctx *ctx, > unsigned > > int err) > > +{ > > + struct s5p_mfc_dev *dev = ctx->dev; > > + struct s5p_mfc_buf *dst_buf; > > + size_t dspl_y_addr = s5p_mfc_get_dspl_y_adr(); > > + > > + ctx->sequence++; > > + /* If frame is same as previous then skip and do not dequeue */ > > + if (s5p_mfc_get_frame_type() == S5P_FIMV_DECODE_FRAME_SKIPPED) > > + return; > > + /* The MFC returns address of the buffer, now we have to > > + * check which videobuf does it correspond to */ > > + list_for_each_entry(dst_buf, &ctx->dst_queue, list) { > > + mfc_debug("Listing: %d\n", dst_buf->b->v4l2_buf.index); > > + /* Check if this is the buffer we're looking for */ > > + if (vb2_cma_plane_paddr(dst_buf->b, 0) == dspl_y_addr) { > > + list_del(&dst_buf->list); > > + ctx->dst_queue_cnt--; > > + dst_buf->b->v4l2_buf.sequence = ctx->sequence; > > + if (s5p_mfc_get_pic_time_top(ctx) == > > + s5p_mfc_get_pic_time_bottom(ctx)) > > + dst_buf->b->v4l2_buf.field = > V4L2_FIELD_NONE; > > + else > > + dst_buf->b->v4l2_buf.field = > > + V4L2_FIELD_INTERLACED; > > + vb2_set_plane_payload(dst_buf->b, 0, ctx- > >luma_size); > > + vb2_set_plane_payload(dst_buf->b, 1, ctx- > >chroma_size); > > + clear_bit(dst_buf->b->v4l2_buf.index, > > + &ctx->dec_dst_flag); > > + if (err) { > > + vb2_buffer_done(dst_buf->b, > > + VB2_BUF_STATE_ERROR); > > + } else { > > + vb2_buffer_done(dst_buf->b, > VB2_BUF_STATE_DONE); > > + } > > + break; > > + } > > + } > > +} > > + > > +/* Handle frame decoding interrupt */ > > +static void s5p_mfc_handle_frame(struct s5p_mfc_ctx *ctx, > > + unsigned int reason, unsigned int > err) > > +{ > > + struct s5p_mfc_dev *dev = ctx->dev; > > + unsigned int dst_frame_status; > > + struct s5p_mfc_buf *src_buf; > > + unsigned long flags; > > + > > + dst_frame_status = s5p_mfc_get_dspl_status() > > + & S5P_FIMV_DEC_STATUS_DECODING_STATUS_MASK; > > + mfc_debug("Frame Status: %x\n", dst_frame_status); > > + spin_lock_irqsave(&dev->irqlock, flags); > > + /* All frames remaining in the buffer have been extracted */ > > + if (dst_frame_status == S5P_FIMV_DEC_STATUS_DECODING_EMPTY) { > > + s5p_mfc_handle_frame_all_extracted(ctx); > > + } > > + > > + /* A frame has been decoded and is in the buffer */ > > + if (dst_frame_status == S5P_FIMV_DEC_STATUS_DISPLAY_ONLY || > > + dst_frame_status == S5P_FIMV_DEC_STATUS_DECODING_DISPLAY) { > > + s5p_mfc_handle_frame_new(ctx, err); > > + } else { > > + mfc_debug("No frame decode.\n"); > > + } > > + /* Mark source buffer as complete */ > > + if (dst_frame_status != S5P_FIMV_DEC_STATUS_DISPLAY_ONLY > > + && !list_empty(&ctx->src_queue)) { > > + src_buf = list_entry(ctx->src_queue.next, struct > s5p_mfc_buf, > > + list); > > + mfc_debug("Packed PB test. Size:%d, prev offset: %ld, this > > run:" > > + " %d\n", src_buf->b->v4l2_planes[0].bytesused, > > + ctx->consumed_stream, > s5p_mfc_get_consumed_stream()); > > + ctx->consumed_stream += s5p_mfc_get_consumed_stream(); > > + if (s5p_mfc_get_frame_type() == > > S5P_FIMV_DECODE_FRAME_P_FRAME > > + && ctx->consumed_stream < > > + src_buf->b- > >v4l2_planes[0].bytesused) { > > + /* Run MFC again on the same buffer */ > > + mfc_debug("Running again the same buffer.\n"); > > + s5p_mfc_set_dec_stream_buffer(ctx, > > + src_buf->cookie.stream, ctx- > >consumed_stream, > > + src_buf->b->v4l2_planes[0].bytesused - > > + ctx- > >consumed_stream); > > + dev->curr_ctx = ctx->num; > > + s5p_mfc_clean_ctx_int_flags(ctx); > > + spin_unlock_irqrestore(&dev->irqlock, flags); > > + s5p_mfc_clear_int_flags(); > > + wake_up_ctx(ctx, reason, err); > > + s5p_mfc_decode_one_frame(ctx, 0); > > + return; > > + } else { > > + mfc_debug("MFC needs next buffer.\n"); > > + /* Advance to next buffer */ > > + if (src_buf->b->v4l2_planes[0].bytesused == 0) { > > + mfc_debug("Setting ctx->state to > FINISHING\n"); > > + ctx->state = MFCINST_DEC_FINISHING; > > + } > > + ctx->consumed_stream = 0; > > + list_del(&src_buf->list); > > + ctx->src_queue_cnt--; > > + vb2_buffer_done(src_buf->b, VB2_BUF_STATE_DONE); > > + } > > + } > > + spin_unlock_irqrestore(&dev->irqlock, flags); > > + mfc_debug("Assesing whether this context should be run > again.\n"); > > + if ((ctx->src_queue_cnt == 0 && ctx->state != > MFCINST_DEC_FINISHING) > > + || ctx->dst_queue_cnt < ctx->dpb_count) > { > > + mfc_debug("No need to run again.\n"); > > + clear_work_bit(ctx); > > + } > > + mfc_debug("After assesing whether this context should be run > > again.\n"); > > + s5p_mfc_clear_int_flags(); > > + wake_up_ctx(ctx, reason, err); > > + if (test_and_clear_bit(0, &dev->hw_lock) == 0) > > + BUG(); > > + s5p_mfc_try_run(dev); > > +} > > + > Basically, I understand that FINISHING state is starting point just > after > src > queue/dequeue is > finished. And state goes to the FINISHED right after all extracted. > But, you change state as a FINISHED at beginning of > s5p_mfc_handle_frame_all_extracted(). > What about FINISHING state ? > if (src_buf->b->v4l2_planes[0].bytesused == 0) this condition meets > after > FINISHED state set > So, it is confusing if state change like (RUNNING -> FINISHING -> > FINISHED) > is > right. The state flow is as follows: 1) The driver receives an src buffer with bytesused set to 0 State is changed from RUNNING to FINISHING. At this point the command that is sent to MFC hw is S5P_FIMV_CH_LAST_FRAME (aka LAST_SEQ). 2) The driver dequeued remaining frames frame by frame. State is FINISHING, S5P_FIMV_CH_LAST_FRAME commands are sent and frames are dequeued in the interrupt handler. 3) If DISPLAY_STATUS[2:0] = 3 (DPB is empty and decoding is finished) Then state is changed to FINISHED. This is the time when s5p_mfc_handle_frame_all_extracted is called. I guess that the thing that bothers you is the place where state is set to FINISHING. This could be moved to s5p_mfc_run_dec_frame - maybe the code would be clearer. Anyway I think still it is ok, because the following code: if (src_buf->b->v4l2_planes[0].bytesused == 0) { mfc_debug("Setting ctx->state to FINISHING\n"); ctx->state = MFCINST_DEC_FINISHING; } Is run only if the following condition: if (dst_frame_status != S5P_FIMV_DEC_STATUS_DISPLAY_ONLY && !list_empty(&ctx->src_queue)) is met. I hope I have answered your question. > Snipped... > Bets regards, -- Kamil Debski Linux Platform Group Samsung Poland R&D Center -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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