On 2019-02-13 9:45 a.m., David Francis wrote:
> Native 420 and 422 transfer modes are new in DSC1.2
>
> In these modes, each two pixels of a slice are treated as one
> pixel, so the slice width is half as large (round down) for
> the purposes of calucating the groups per line and chunk size
> in bytes
>
> In native 422 mode, each pixel has four components, so the
> mux component of a group is larger by one additional mux word
> and one additional component
>
> Now that there is native 422 support, the configuration option
> previously called enable422 is renamed to simple_422 to avoid
> confusion
>
> Signed-off-by: David Francis <David.Francis@xxxxxxx>
Reviewed-by: Harry Wentland <harry.wentland@xxxxxxx>
Harry
> ---
> drivers/gpu/drm/drm_dsc.c | 31 +++++++++++++++++++++++--------
> drivers/gpu/drm/i915/intel_vdsc.c | 4 ++--
> include/drm/drm_dsc.h | 4 ++--
> 3 files changed, 27 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_dsc.c b/drivers/gpu/drm/drm_dsc.c
> index 4b0e3c9c3ff8..9e675dd39a44 100644
> --- a/drivers/gpu/drm/drm_dsc.c
> +++ b/drivers/gpu/drm/drm_dsc.c
> @@ -77,7 +77,7 @@ void drm_dsc_pps_infoframe_pack(struct drm_dsc_pps_infoframe *pps_sdp,
> ((dsc_cfg->bits_per_pixel & DSC_PPS_BPP_HIGH_MASK) >>
> DSC_PPS_MSB_SHIFT) |
> dsc_cfg->vbr_enable << DSC_PPS_VBR_EN_SHIFT |
> - dsc_cfg->enable422 << DSC_PPS_SIMPLE422_SHIFT |
> + dsc_cfg->simple_422 << DSC_PPS_SIMPLE422_SHIFT |
> dsc_cfg->convert_rgb << DSC_PPS_CONVERT_RGB_SHIFT |
> dsc_cfg->block_pred_enable << DSC_PPS_BLOCK_PRED_EN_SHIFT;
>
> @@ -246,19 +246,34 @@ int drm_dsc_compute_rc_parameters(struct drm_dsc_config *vdsc_cfg)
> unsigned long final_scale = 0;
> unsigned long rbs_min = 0;
>
> - /* Number of groups used to code each line of a slice */
> - groups_per_line = DIV_ROUND_UP(vdsc_cfg->slice_width,
> - DSC_RC_PIXELS_PER_GROUP);
> + if (vdsc_cfg->native_420 || vdsc_cfg->native_422) {
> + /* Number of groups used to code each line of a slice */
> + groups_per_line = DIV_ROUND_UP(vdsc_cfg->slice_width / 2,
> + DSC_RC_PIXELS_PER_GROUP);
>
> - /* chunksize in Bytes */
> - vdsc_cfg->slice_chunk_size = DIV_ROUND_UP(vdsc_cfg->slice_width *
> - vdsc_cfg->bits_per_pixel,
> - (8 * 16));
> + /* chunksize in Bytes */
> + vdsc_cfg->slice_chunk_size = DIV_ROUND_UP(vdsc_cfg->slice_width / 2 *
> + vdsc_cfg->bits_per_pixel,
> + (8 * 16));
> + } else {
> + /* Number of groups used to code each line of a slice */
> + groups_per_line = DIV_ROUND_UP(vdsc_cfg->slice_width,
> + DSC_RC_PIXELS_PER_GROUP);
> +
> + /* chunksize in Bytes */
> + vdsc_cfg->slice_chunk_size = DIV_ROUND_UP(vdsc_cfg->slice_width *
> + vdsc_cfg->bits_per_pixel,
> + (8 * 16));
> + }
>
> if (vdsc_cfg->convert_rgb)
> num_extra_mux_bits = 3 * (vdsc_cfg->mux_word_size +
> (4 * vdsc_cfg->bits_per_component + 4)
> - 2);
> + else if (vdsc_cfg->native_422)
> + num_extra_mux_bits = 4 * vdsc_cfg->mux_word_size +
> + (4 * vdsc_cfg->bits_per_component + 4) +
> + 3 * (4 * vdsc_cfg->bits_per_component) - 2;
> else
> num_extra_mux_bits = 3 * vdsc_cfg->mux_word_size +
> (4 * vdsc_cfg->bits_per_component + 4) +
> diff --git a/drivers/gpu/drm/i915/intel_vdsc.c b/drivers/gpu/drm/i915/intel_vdsc.c
> index c76cec8bfb74..7702c5c8b3f2 100644
> --- a/drivers/gpu/drm/i915/intel_vdsc.c
> +++ b/drivers/gpu/drm/i915/intel_vdsc.c
> @@ -369,7 +369,7 @@ int intel_dp_compute_dsc_params(struct intel_dp *intel_dp,
> DSC_1_1_MAX_LINEBUF_DEPTH_BITS : line_buf_depth;
>
> /* Gen 11 does not support YCbCr */
> - vdsc_cfg->enable422 = false;
> + vdsc_cfg->simple_422 = false;
> /* Gen 11 does not support VBR */
> vdsc_cfg->vbr_enable = false;
> vdsc_cfg->block_pred_enable =
> @@ -496,7 +496,7 @@ static void intel_configure_pps_for_dsc_encoder(struct intel_encoder *encoder,
> pps_val |= DSC_BLOCK_PREDICTION;
> if (vdsc_cfg->convert_rgb)
> pps_val |= DSC_COLOR_SPACE_CONVERSION;
> - if (vdsc_cfg->enable422)
> + if (vdsc_cfg->simple_422)
> pps_val |= DSC_422_ENABLE;
> if (vdsc_cfg->vbr_enable)
> pps_val |= DSC_VBR_ENABLE;
> diff --git a/include/drm/drm_dsc.h b/include/drm/drm_dsc.h
> index ad43494f1cc8..4e55e37943d7 100644
> --- a/include/drm/drm_dsc.h
> +++ b/include/drm/drm_dsc.h
> @@ -70,10 +70,10 @@ struct drm_dsc_config {
> /* Slice Height */
> u16 slice_height;
> /*
> - * 4:2:2 enable mode (from PPS, 4:2:2 conversion happens
> + * Simple 4:2:2 mode (from PPS, 4:2:2 conversion happens
> * outside of DSC encode/decode algorithm)
> */
> - bool enable422;
> + bool simple_422;
> /* Picture Width */
> u16 pic_width;
> /* Picture Height */
>
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