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SubjectRe: [PATCH v2 7/7] drm/msm/dpu: calculate DSC encoder parameters dynamically
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On 29/04/2023 02:45, Kuogee Hsieh wrote:
> During DSC preparation, add run time calculation to figure out what
> usage modes, split mode and merge mode, is going to be setup.

This patch doesn't determine the mode. It changes programming of DSC
bits according to the mode being selected.

>
> Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
> ---
> drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 56 ++++++++++++++++-------------
> 1 file changed, 31 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> index 2fdacf1..3d18642 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> @@ -529,17 +529,9 @@ void dpu_encoder_helper_split_config(
> bool dpu_encoder_use_dsc_merge(struct drm_encoder *drm_enc)
> {
> struct dpu_encoder_virt *dpu_enc = to_dpu_encoder_virt(drm_enc);
> - int i, intf_count = 0, num_dsc = 0;
> + struct msm_display_topology *topology = &dpu_enc->topology;
>
> - for (i = 0; i < MAX_PHYS_ENCODERS_PER_VIRTUAL; i++)
> - if (dpu_enc->phys_encs[i])
> - intf_count++;
> -
> - /* See dpu_encoder_get_topology, we only support 2:2:1 topology */
> - if (dpu_enc->dsc)
> - num_dsc = 2;
> -
> - return (num_dsc > 0) && (num_dsc > intf_count);
> + return (topology->num_dsc > topology->num_intf);
> }
>
> static void dpu_encoder_get_topology(
> @@ -1861,41 +1853,55 @@ static void dpu_encoder_prep_dsc(struct dpu_encoder_virt *dpu_enc,
> struct dpu_encoder_phys *enc_master = dpu_enc->cur_master;
> struct dpu_hw_dsc *hw_dsc[MAX_CHANNELS_PER_ENC];
> struct dpu_hw_pingpong *hw_pp[MAX_CHANNELS_PER_ENC];
> - int this_frame_slices;
> + struct msm_display_topology *topology = &dpu_enc->topology;
> int intf_ip_w, enc_ip_w;
> - int dsc_common_mode;
> - int pic_width;
> + int dsc_common_mode = 0;

Please don't top-init variables unless required (or unless they are
constant).

> u32 initial_lines;
> + int num_dsc = topology->num_dsc;
> + int num_intf = topology->num_intf;
> int i;
>
> - for (i = 0; i < MAX_CHANNELS_PER_ENC; i++) {
> + for (i = 0; i < num_dsc; i++) {
> hw_pp[i] = dpu_enc->hw_pp[i];
> hw_dsc[i] = dpu_enc->hw_dsc[i];
>
> if (!hw_pp[i] || !hw_dsc[i]) {
> DPU_ERROR_ENC(dpu_enc, "invalid params for DSC\n");
> return;
> - }
> + }

What is the difference here?

> }
>
> - dsc_common_mode = 0;
> - pic_width = dsc->pic_width;
> + intf_ip_w = dsc->pic_width;
>
> - dsc_common_mode = DSC_MODE_MULTIPLEX | DSC_MODE_SPLIT_PANEL;
> if (enc_master->intf_mode == INTF_MODE_VIDEO)
> dsc_common_mode |= DSC_MODE_VIDEO;
>
> - this_frame_slices = pic_width / dsc->slice_width;
> - intf_ip_w = this_frame_slices * dsc->slice_width;
> -
> /*
> - * dsc merge case: when using 2 encoders for the same stream,
> - * no. of slices need to be same on both the encoders.
> + * If this encoder is driving more than one DSC encoder, they
> + * operate in tandem, same pic dimension needs to be used by
> + * each of them.(pp-split is assumed to be not supported)
> + *

Extra empty line. Also the comment doesn't make sense here anymore. We
already have comment for the division by two below.

> */
> - enc_ip_w = intf_ip_w / 2;
> + enc_ip_w = intf_ip_w;
> +
> + intf_ip_w /= num_intf;
> +
> + if (num_dsc > 1)
> + dsc_common_mode |= DSC_MODE_SPLIT_PANEL;
> +
> + if (dpu_encoder_use_dsc_merge(&dpu_enc->base)) {
> + dsc_common_mode |= DSC_MODE_MULTIPLEX;
> + /*
> + * in dsc merge case: when using 2 encoders for the same
> + * stream, no. of slices need to be same on both the
> + * encoders.
> + */
> + enc_ip_w = intf_ip_w / 2;
> + }
> +
> initial_lines = dpu_encoder_dsc_initial_line_calc(dsc, enc_ip_w);
>
> - for (i = 0; i < MAX_CHANNELS_PER_ENC; i++)
> + for (i = 0; i < num_dsc; i++)
> dpu_encoder_dsc_pipe_cfg(dpu_enc, hw_dsc[i], hw_pp[i], dsc,
> dsc_common_mode, initial_lines);
> }

--
With best wishes
Dmitry

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