media: rkvdec: Use structs to represent the HW RPS

This is in preparation to add support for other variants of the decoder.

Moving to struct representation is mainly to prepare for multicore
support that is present in e.g. rk3588.

Tested-by: Diederik de Haas <didi.debian@cknow.org>  # Rock 5B
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Detlev Casanova <detlev.casanova@collabora.com>
Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>

Author: cazou

drivers/media/platform/rockchip/rkvdec/rkvdec-h264.c

@@ -18,7 +18,6 @@
 
 /* Size with u32 units. */
 #define RKV_CABAC_INIT_BUFFER_SIZE	(3680 + 128)
-#define RKV_RPS_SIZE			((128 + 128) / 4)
 #define RKV_ERROR_INFO_SIZE		(256 * 144 * 4)
 
 #define RKVDEC_NUM_REFLIST		3
@@ -33,6 +32,40 @@ struct rkvdec_sps_pps_packet {
 	u32 info[8];
 };
 
+struct rkvdec_rps_entry {
+	u32 dpb_info0:          5;
+	u32 bottom_flag0:       1;
+	u32 view_index_off0:    1;
+	u32 dpb_info1:          5;
+	u32 bottom_flag1:       1;
+	u32 view_index_off1:    1;
+	u32 dpb_info2:          5;
+	u32 bottom_flag2:       1;
+	u32 view_index_off2:    1;
+	u32 dpb_info3:          5;
+	u32 bottom_flag3:       1;
+	u32 view_index_off3:    1;
+	u32 dpb_info4:          5;
+	u32 bottom_flag4:       1;
+	u32 view_index_off4:    1;
+	u32 dpb_info5:          5;
+	u32 bottom_flag5:       1;
+	u32 view_index_off5:    1;
+	u32 dpb_info6:          5;
+	u32 bottom_flag6:       1;
+	u32 view_index_off6:    1;
+	u32 dpb_info7:          5;
+	u32 bottom_flag7:       1;
+	u32 view_index_off7:    1;
+} __packed;
+
+struct rkvdec_rps {
+	u16 frame_num[16];
+	u32 reserved0;
+	struct rkvdec_rps_entry entries[12];
+	u32 reserved1[66];
+} __packed;
+
 struct rkvdec_ps_field {
 	u16 offset;
 	u8 len;
@@ -93,7 +126,7 @@ struct rkvdec_ps_field {
 struct rkvdec_h264_priv_tbl {
 	s8 cabac_table[4][464][2];
 	struct rkvdec_h264_scaling_list scaling_list;
-	u32 rps[RKV_RPS_SIZE];
+	struct rkvdec_rps rps;
 	struct rkvdec_sps_pps_packet param_set[256];
 	u8 err_info[RKV_ERROR_INFO_SIZE];
 };
@@ -259,6 +292,51 @@ static void lookup_ref_buf_idx(struct rkvdec_ctx *ctx,
 	}
 }
 
+static void set_dpb_info(struct rkvdec_rps_entry *entries,
+			 u8 reflist,
+			 u8 refnum,
+			 u8 info,
+			 bool bottom)
+{
+	struct rkvdec_rps_entry *entry = &entries[(reflist * 4) + refnum / 8];
+	u8 idx = refnum % 8;
+
+	switch (idx) {
+	case 0:
+		entry->dpb_info0 = info;
+		entry->bottom_flag0 = bottom;
+		break;
+	case 1:
+		entry->dpb_info1 = info;
+		entry->bottom_flag1 = bottom;
+		break;
+	case 2:
+		entry->dpb_info2 = info;
+		entry->bottom_flag2 = bottom;
+		break;
+	case 3:
+		entry->dpb_info3 = info;
+		entry->bottom_flag3 = bottom;
+		break;
+	case 4:
+		entry->dpb_info4 = info;
+		entry->bottom_flag4 = bottom;
+		break;
+	case 5:
+		entry->dpb_info5 = info;
+		entry->bottom_flag5 = bottom;
+		break;
+	case 6:
+		entry->dpb_info6 = info;
+		entry->bottom_flag6 = bottom;
+		break;
+	case 7:
+		entry->dpb_info7 = info;
+		entry->bottom_flag7 = bottom;
+		break;
+	}
+}
+
 static void assemble_hw_rps(struct rkvdec_ctx *ctx,
 			    struct v4l2_h264_reflist_builder *builder,
 			    struct rkvdec_h264_run *run)
@@ -268,11 +346,10 @@ static void assemble_hw_rps(struct rkvdec_ctx *ctx,
 	struct rkvdec_h264_ctx *h264_ctx = ctx->priv;
 	struct rkvdec_h264_priv_tbl *priv_tbl = h264_ctx->priv_tbl.cpu;
 
-	u32 *hw_rps = priv_tbl->rps;
+	struct rkvdec_rps *hw_rps = &priv_tbl->rps;
 	u32 i, j;
-	u16 *p = (u16 *)hw_rps;
 
-	memset(hw_rps, 0, sizeof(priv_tbl->rps));
+	memset(hw_rps, 0, sizeof(*hw_rps));
 
 	/*
 	 * Assign an invalid pic_num if DPB entry at that position is inactive.
@@ -284,7 +361,7 @@ static void assemble_hw_rps(struct rkvdec_ctx *ctx,
 		if (!(dpb[i].flags & V4L2_H264_DPB_ENTRY_FLAG_ACTIVE))
 			continue;
 
-		p[i] = builder->refs[i].frame_num;
+		hw_rps->frame_num[i] = builder->refs[i].frame_num;
 	}
 
 	for (j = 0; j < RKVDEC_NUM_REFLIST; j++) {
@@ -311,9 +388,7 @@ static void assemble_hw_rps(struct rkvdec_ctx *ctx,
 			dpb_valid = run->ref_buf[ref->index] != NULL;
 			bottom = ref->fields == V4L2_H264_BOTTOM_FIELD_REF;
 
-			set_ps_field(hw_rps, DPB_INFO(i, j),
-				     ref->index | dpb_valid << 4);
-			set_ps_field(hw_rps, BOTTOM_FLAG(i, j), bottom);
+			set_dpb_info(hw_rps->entries, j, i, ref->index | (dpb_valid << 4), bottom);
 		}
 	}
 }