[PATCH] s5p-mfc: Ensure HEVC QP controls range is properly updated

[Sylwester Nawrocki]

When value of V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP or V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP
controls is changed we should update range of a set of HEVC quantization
parameter v4l2 controls as specified in the HEVC controls documentation.

Signed-off-by: Sylwester Nawrocki <s.nawro...@samsung.com>
---
 drivers/media/platform/s5p-mfc/s5p_mfc_enc.c | 40 ++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/drivers/media/platform/s5p-mfc/s5p_mfc_enc.c 
b/drivers/media/platform/s5p-mfc/s5p_mfc_enc.c
index 6c80ebc5dbcc..810dabe2f1b9 100644
--- a/drivers/media/platform/s5p-mfc/s5p_mfc_enc.c
+++ b/drivers/media/platform/s5p-mfc/s5p_mfc_enc.c
@@ -1773,6 +1773,42 @@ static inline int vui_sar_idc(enum 
v4l2_mpeg_video_h264_vui_sar_idc sar)
        return t[sar];
 }
 
+/*
+ * Update range of all HEVC quantization parameter controls that depend on the
+ * V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP, V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP controls.
+ */
+static void __enc_update_hevc_qp_ctrls_range(struct s5p_mfc_ctx *ctx,
+                                            int min, int max)
+{
+       static const int __hevc_qp_ctrls[] = {
+               V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_QP,
+               V4L2_CID_MPEG_VIDEO_HEVC_P_FRAME_QP,
+               V4L2_CID_MPEG_VIDEO_HEVC_B_FRAME_QP,
+               V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L0_QP,
+               V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L1_QP,
+               V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L2_QP,
+               V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L3_QP,
+               V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L4_QP,
+               V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_QP,
+               V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L6_QP,
+       };
+       struct v4l2_ctrl *ctrl = NULL;
+       int i, j;
+
+       for (i = 0; i < ARRAY_SIZE(__hevc_qp_ctrls); i++) {
+               for (j = 0; j < ARRAY_SIZE(ctx->ctrls); j++) {
+                       if (ctx->ctrls[j]->id == __hevc_qp_ctrls[i]) {
+                               ctrl = ctx->ctrls[j];
+                               break;
+                       }
+               }
+               if (WARN_ON(!ctrl))
+                       break;
+
+               __v4l2_ctrl_modify_range(ctrl, min, max, ctrl->step, min);
+       }
+}
+
 static int s5p_mfc_enc_s_ctrl(struct v4l2_ctrl *ctrl)
 {
        struct s5p_mfc_ctx *ctx = ctrl_to_ctx(ctrl);
@@ -2038,9 +2074,13 @@ static int s5p_mfc_enc_s_ctrl(struct v4l2_ctrl *ctrl)
                break;
        case V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP:
                p->codec.hevc.rc_min_qp = ctrl->val;
+               __enc_update_hevc_qp_ctrls_range(ctx, ctrl->val,
+                                                p->codec.hevc.rc_max_qp);
                break;
        case V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP:
                p->codec.hevc.rc_max_qp = ctrl->val;
+               __enc_update_hevc_qp_ctrls_range(ctx, p->codec.hevc.rc_min_qp,
+                                                ctrl->val);
                break;
        case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL:
                p->codec.hevc.level_v4l2 = ctrl->val;
-- 
2.14.2