// SPDX-License-Identifier: GPL-2.0-or-later /* * Cedrus VPU driver * * Copyright (c) 2019 Jernej Skrabec <[email protected]> */ /* * VP8 in Cedrus shares same engine as H264. * * Note that it seems necessary to call bitstream parsing functions, * to parse frame header, otherwise decoded image is garbage. This is * contrary to what is driver supposed to do. However, values are not * really used, so this might be acceptable. It's possible that bitstream * parsing functions set some internal VPU state, which is later necessary * for proper decoding. Biggest suspect is "VP8 probs update" trigger. */ #include <linux/delay.h> #include <linux/types.h> #include <media/videobuf2-dma-contig.h> #include "cedrus.h" #include "cedrus_hw.h" #include "cedrus_regs.h" #define CEDRUS_ENTROPY_PROBS_SIZE … #define VP8_PROB_HALF … #define QUANT_DELTA_COUNT … /* * This table comes from the concatenation of k_coeff_entropy_update_probs, * kf_ymode_prob, default_mv_context, etc. It is provided in this form in * order to avoid computing it every time the driver is initialised, and is * suitable for direct consumption by the hardware. */ static const u8 prob_table_init[] = …; /* * This table is a copy of k_mv_entropy_update_probs from the VP8 * specification. * * FIXME: If any other driver uses it, we can consider moving * this table so it can be shared. */ static const u8 k_mv_entropy_update_probs[2][V4L2_VP8_MV_PROB_CNT] = …; static uint8_t read_bits(struct cedrus_dev *dev, unsigned int bits_count, unsigned int probability) { … } static void get_delta_q(struct cedrus_dev *dev) { … } static void process_segmentation_info(struct cedrus_dev *dev) { … } static void process_ref_lf_delta_info(struct cedrus_dev *dev) { … } static void process_ref_frame_info(struct cedrus_dev *dev) { … } static void cedrus_irq_clear(struct cedrus_dev *dev) { … } static void cedrus_read_header(struct cedrus_dev *dev, const struct v4l2_ctrl_vp8_frame *slice) { … } static void cedrus_vp8_update_probs(const struct v4l2_ctrl_vp8_frame *slice, u8 *prob_table) { … } static enum cedrus_irq_status cedrus_vp8_irq_status(struct cedrus_ctx *ctx) { … } static void cedrus_vp8_irq_clear(struct cedrus_ctx *ctx) { … } static void cedrus_vp8_irq_disable(struct cedrus_ctx *ctx) { … } static int cedrus_vp8_setup(struct cedrus_ctx *ctx, struct cedrus_run *run) { … } static int cedrus_vp8_start(struct cedrus_ctx *ctx) { … } static void cedrus_vp8_stop(struct cedrus_ctx *ctx) { … } static void cedrus_vp8_trigger(struct cedrus_ctx *ctx) { … } struct cedrus_dec_ops cedrus_dec_ops_vp8 = …;
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