[Intel-gfx] [PATCH 01/10] drm: i915: Defining Compression Capabilities
Manasi Navare
manasi.d.navare at intel.com
Fri Feb 23 23:54:09 UTC 2018
On Fri, Feb 23, 2018 at 09:25:44PM +0530, Gaurav K Singh wrote:
> For Vesa Display Stream compression, defining structures for
> compression capabilities to be stored in encoder.
>
> Signed-off-by: Gaurav K Singh <gaurav.k.singh at intel.com>
> ---
> drivers/gpu/drm/i915/i915_drv.h | 125 +++++++++++++++++++++++++++++++++++++++
> drivers/gpu/drm/i915/intel_drv.h | 62 +++++++++++++++++++
> include/drm/drm_dp_helper.h | 1 +
> 3 files changed, 188 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 0d8cb74e7d02..4b1c323c0925 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -780,6 +780,131 @@ struct i915_psr {
> void (*setup_vsc)(struct intel_dp *, const struct intel_crtc_state *);
> };
>
> +/* DSC Configuration structure */
> +#define NUM_BUF_RANGES 15
> +
> +/* Configuration for a single Rate Control model range */
> +struct rc_range_parameters {
> + /* Min Quantization Parameters allowed for this range */
> + unsigned long range_min_qp;
Its only a 5 bit value, so uint_8 should be good, why have a unsigned long.
Same for max_qp which is 5 bits and bpg_offset which is 6 bits.
Please consider these for the parameters below.
> + /* Max Quantization Parameters allowed for this range */
> + unsigned long range_max_qp;
> + /* Bits/group offset to apply to target for this group */
> + unsigned long range_bpg_offset;
> +};
> +
> +struct vdsc_config {
> + /* Bits / component for previous reconstructed line buffer */
> + unsigned long line_buf_depth;
> + /*
> + * Rate control buffer size (in bits); not in PPS,
> + * used only in C model for checking overflow
> + */
> + unsigned long rc_bits;
> + /* Bits per component to code (must be 8, 10, or 12) */
> + unsigned long bits_per_component;
> + /*
> + * Flag indicating to do RGB - YCoCg conversion
> + * and back (should be 1 for RGB input)
> + */
> + bool convert_rgb;
> + unsigned long slice_count;
For eDP, it can be max 4, why unsigned long?
> + /* Slice Width */
> + unsigned long slice_width;
> + /* Slice Height */
> + unsigned long slice_height;
> + /*
> + * 4:2:2 enable mode (from PPS, 4:2:2 conversion happens
> + * outside of DSC encode/decode algorithm)
> + */
> + bool enable422;
> + /* Picture Width */
> + unsigned long pic_width;
> + /* Picture Height */
> + unsigned long pic_height;
> + /* Offset to bits/group used by RC to determine QP adjustment */
> + unsigned long rc_tgt_offset_high;
> + /* Offset to bits/group used by RC to determine QP adjustment */
> + unsigned long rc_tgt_offset_low;
> + /* Bits/pixel target << 4 (ie., 4 fractional bits) */
> + unsigned long bits_per_pixel;
> + /*
> + * Factor to determine if an edge is present based
> + * on the bits produced
> + */
> + unsigned long rc_edge_factor;
> + /* Slow down incrementing once the range reaches this value */
> + unsigned long rc_quant_incr_limit1;
> + /* Slow down incrementing once the range reaches this value */
> + unsigned long rc_quant_incr_limit0;
> + /* Number of pixels to delay the initial transmission */
> + unsigned long initial_xmit_delay;
> + /* Number of pixels to delay the VLD on the decoder,not including SSM */
> + unsigned long initial_dec_delay;
> + /* Block prediction range (in pixels) */
> + bool block_pred_enable;
> + /* Bits/group offset to use for first line of the slice */
> + unsigned long first_line_bpg_Ofs;
> + /* Value to use for RC model offset at slice start */
> + unsigned long initial_offset;
> + /* X position in the picture of top-left corner of slice */
> + unsigned long x_start;
> + /* Y position in the picture of top-left corner of slice */
> + unsigned long y_start;
> + /* Thresholds defining each of the buffer ranges */
> + unsigned long rc_buf_thresh[NUM_BUF_RANGES - 1];
> + /* Parameters for each of the RC ranges */
> + struct rc_range_parameters rc_range_params[NUM_BUF_RANGES];
> + /* Total size of RC model */
> + unsigned long rc_model_size;
> + /* Minimum QP where flatness information is sent */
> + unsigned long flatness_minQp;
> + /* Maximum QP where flatness information is sent */
> + unsigned long flatness_maxQp;
> + /*
> + * MAX-MIN for all components is required to
> + * be <= this value for flatness to be used
> + */
> + unsigned long flatness_det_thresh;
> + /* Initial value for scale factor */
> + unsigned long initial_scale_value;
> + /* Decrement scale factor every scale_decrement_interval groups */
> + unsigned long scale_decrement_interval;
> + /* Increment scale factor every scale_increment_interval groups */
> + unsigned long scale_increment_interval;
> + /* Non-first line BPG offset to use */
> + unsigned long nfl_bpg_offset;
> + /* BPG offset used to enforce slice bit */
> + unsigned long slice_bpg_offset;
> + /* Final RC linear transformation offset value */
> + unsigned long final_offset;
> + /* Enable on-off VBR (ie., disable stuffing bits) */
> + bool vbr_enable;
> + /* Mux word size (in bits) for SSM mode */
> + unsigned long mux_word_size;
> + /*
> + * The (max) size in bytes of the "chunks" that are
> + * used in slice multiplexing
> + */
> + unsigned long chunk_size;
> + /* Placeholder for PPS identifier */
> + unsigned long pps_identifier;
> + /* DSC Minor Version */
> + unsigned long dsc_version_minor;
> + /* DSC Major version */
> + unsigned long dsc_version_major;
> + /* Number of VDSC engines */
> + unsigned long num_vdsc_instances;
> +};
> +
> +/* Compression caps stored in encoder */
> +struct i915_compression_params {
> + bool compression_support;
> + unsigned long compression_bpp;
Does this indicate the 16 bit value with 4 fractional bits? May be add a comment for that.
> + struct vdsc_config dsc_cfg;
> + unsigned char slice_count;
> +};
There is probably no need to have these convoluted structs, the compressed bpp and slice count
are obtained directly from DPCDs which can be populated where needed with the helpers instead
of populating them into dp_dsc_sink_cap and then populating i915_compression_params.slice_count/
compressed_bpp.
Again I have helpers for those already currently on the internal M-L.
intel_dp can then only have compression_support and dsc_cfg.
> +
> enum intel_pch {
> PCH_NONE = 0, /* No PCH present */
> PCH_IBX, /* Ibexpeak PCH */
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 5853d92a6512..6e1b907990bf 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -954,6 +954,63 @@ struct intel_dp_compliance {
> u8 test_lane_count;
> };
>
> +/* Vesa Display Stream Capability of DP Sink */
> +struct dp_sink_dsc_caps {
> + /* Display Stream Compression Support */
> + bool is_dsc_supported;
> + u8 dsc_major_ver;
> + u8 dsc_minor_ver;
> + u16 rcbuffer_blocksize;
> + /* n+1 value */
> + u16 rcbuffer_size_in_blocks;
> + unsigned long rcbuffer_size;
> +
> + union {
> + u8 slice_caps;
> + struct {
> + u8 one_slice_per_line_support : 1;
> + u8 two_slice_per_line_support : 1;
> + u8 slice_caps_reserved1 : 1;
> + u8 four_slice_per_line_support : 1;
> + u8 slice_caps_reserved2 : 4;
> + };
> + };
> + /* Decode line buffer bits of precision */
> + unsigned long line_buffer_bit_depth;
> + bool is_block_pred_supported;
> + unsigned long sink_support_max_bpp;
> +
> + union {
> + u8 color_format_caps;
> + struct {
> + u8 RGB_support : 1;
> + u8 YCbCr444_support : 1;
> + u8 YCbCr422_support : 1;
> + u8 color_format_caps_reserved : 5;
> + };
> + };
> +
> + union {
> + u8 color_depth_caps;
> + struct {
> + u8 color_depth_caps_reserved1 : 1;
> + u8 support_8bpc : 1;
> + u8 support_10bpc : 1;
> + u8 support_12bpc : 1;
> + u8 color_depth_caps_reserved2 : 4;
> + };
> + };
> +
> + u16 slice_height;
> + u16 slice_width;
> + /* Y Resolution */
> + u16 pic_height;
> + /* X Resolution */
> + u16 pic_width;
> +};
Since we will cache the entire DPCD register set for DSC, we really dont need to have structure
for saving those values, they can be computed whenever needed using helpers/macros that read the cached
DPCD values. That is the convention followed for values obtained from DP DPCD in rest of the driver.
I have the patches for helpers that give these values but currently on internal M-L.
Manasi
> +
> +
> +
> struct intel_dp {
> i915_reg_t output_reg;
> i915_reg_t aux_ch_ctl_reg;
> @@ -971,6 +1028,8 @@ struct intel_dp {
> uint8_t psr_dpcd[EDP_PSR_RECEIVER_CAP_SIZE];
> uint8_t downstream_ports[DP_MAX_DOWNSTREAM_PORTS];
> uint8_t edp_dpcd[EDP_DISPLAY_CTL_CAP_SIZE];
> + uint8_t dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE];
> + uint8_t fec_dpcd;
> /* source rates */
> int num_source_rates;
> const int *source_rates;
> @@ -1046,6 +1105,9 @@ struct intel_dp {
>
> /* Displayport compliance testing */
> struct intel_dp_compliance compliance;
> +
> + /* For Vesa Display Stream Compression Support */
> + struct i915_compression_params compr_params;
> };
>
> struct intel_lspcon {
> diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> index da58a428c8d7..05f811c50d28 100644
> --- a/include/drm/drm_dp_helper.h
> +++ b/include/drm/drm_dp_helper.h
> @@ -896,6 +896,7 @@ u8 drm_dp_get_adjust_request_pre_emphasis(const u8 link_status[DP_LINK_STATUS_SI
> #define DP_RECEIVER_CAP_SIZE 0xf
> #define EDP_PSR_RECEIVER_CAP_SIZE 2
> #define EDP_DISPLAY_CTL_CAP_SIZE 3
> +#define DP_DSC_RECEIVER_CAP_SIZE 0xb
>
> void drm_dp_link_train_clock_recovery_delay(const u8 dpcd[DP_RECEIVER_CAP_SIZE]);
> void drm_dp_link_train_channel_eq_delay(const u8 dpcd[DP_RECEIVER_CAP_SIZE]);
> --
> 1.9.1
>
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