[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>

diff --git a/drivers/media/platform/s5p-mfc/s5p_mfc_enc.c b/drivers/media/platform/s5p-mfc/s5p_mfc_enc.c
index a904a1c..4816f31 100644 (file)
--- 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,