[media] s5p-mfc: support MIN_BUFFERS query for encoder

Add V4L2_CID_MIN_BUFFERS_FOR_OUTPUT query for encoder.
Once mfc encoder state is HEAD_PARSED, which is sequence
header produced, dpb_count is avaialable. Let user space
query this value.

Signed-off-by: Kiran AVND <avnd.kiran@samsung.com>
Signed-off-by: Arun Kumar K <arun.kk@samsung.com>
Signed-off-by: Kamil Debski <k.debski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

1 files changed, 42 insertions, 0 deletions

diff --git a/drivers/media/platform/s5p-mfc/s5p_mfc_enc.c b/drivers/media/platform/s5p-mfc/s5p_mfc_enc.c
index a904a1c7bb21..4816f31acf68 100644
--- a/drivers/media/platform/s5p-mfc/s5p_mfc_enc.c
+++ b/drivers/media/platform/s5p-mfc/s5p_mfc_enc.c
@@ -690,6 +690,16 @@ static struct mfc_control controls[] = {
                 .step = 1,
                 .default_value = 0,
         },
+        {
+                .id = V4L2_CID_MIN_BUFFERS_FOR_OUTPUT,
+                .type = V4L2_CTRL_TYPE_INTEGER,
+                .name = "Minimum number of output bufs",
+                .minimum = 1,
+                .maximum = 32,
+                .step = 1,
+                .default_value = 1,
+                .is_volatile = 1,
+        },
 };
 
 #define NUM_CTRLS ARRAY_SIZE(controls)
@@ -1624,8 +1634,40 @@ static int s5p_mfc_enc_s_ctrl(struct v4l2_ctrl *ctrl)
         return ret;
 }
 
+static int s5p_mfc_enc_g_v_ctrl(struct v4l2_ctrl *ctrl)
+{
+        struct s5p_mfc_ctx *ctx = ctrl_to_ctx(ctrl);
+        struct s5p_mfc_dev *dev = ctx->dev;
+
+        switch (ctrl->id) {
+        case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
+                if (ctx->state >= MFCINST_HEAD_PARSED &&
+                    ctx->state < MFCINST_ABORT) {
+                        ctrl->val = ctx->pb_count;
+                        break;
+                } else if (ctx->state != MFCINST_INIT) {
+                        v4l2_err(&dev->v4l2_dev, "Encoding not initialised\n");
+                        return -EINVAL;
+                }
+                /* Should wait for the header to be produced */
+                s5p_mfc_clean_ctx_int_flags(ctx);
+                s5p_mfc_wait_for_done_ctx(ctx,
+                                S5P_MFC_R2H_CMD_SEQ_DONE_RET, 0);
+                if (ctx->state >= MFCINST_HEAD_PARSED &&
+                    ctx->state < MFCINST_ABORT) {
+                        ctrl->val = ctx->pb_count;
+                } else {
+                        v4l2_err(&dev->v4l2_dev, "Encoding not initialised\n");
+                        return -EINVAL;
+                }
+                break;
+        }
+        return 0;
+}
+
 static const struct v4l2_ctrl_ops s5p_mfc_enc_ctrl_ops = {
         .s_ctrl = s5p_mfc_enc_s_ctrl,
+        .g_volatile_ctrl = s5p_mfc_enc_g_v_ctrl,
 };
 
 static int vidioc_s_parm(struct file *file, void *priv,