On Fri, Jul 28, 2023 at 09:41:44AM +0530, Ankit Nautiyal wrote:
> Refactor code to separate functions for eDP and DP for computing
> pipe_bpp/compressed bpp when DSC is involved.
>
> This will help to optimize the link configuration for DP later.
>
> v2: Fix checkpatch warning.
>
> Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>
Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_dp.c | 191 ++++++++++++++++--------
> 1 file changed, 126 insertions(+), 65 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index 6228cfc44055..c87c3836966c 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -1699,6 +1699,115 @@ bool is_dsc_pipe_bpp_sufficient(struct drm_i915_private *i915, int pipe_bpp)
> return pipe_bpp >= intel_dp_dsc_min_src_input_bpc(i915) * 3;
> }
>
> +static
> +int intel_dp_force_dsc_pipe_bpp(struct intel_dp *intel_dp)
> +{
> + struct drm_i915_private *i915 = dp_to_i915(intel_dp);
> + int forced_bpp;
> +
> + if (!intel_dp->force_dsc_bpc)
> + return 0;
> +
> + forced_bpp = intel_dp->force_dsc_bpc * 3;
> +
> + if (is_dsc_pipe_bpp_sufficient(i915, forced_bpp)) {
> + drm_dbg_kms(&i915->drm, "Input DSC BPC forced to %d\n", intel_dp->force_dsc_bpc);
> + return forced_bpp;
> + }
> +
> + drm_dbg_kms(&i915->drm, "Cannot force DSC BPC:%d, due to DSC BPC limits\n",
> + intel_dp->force_dsc_bpc);
> +
> + return 0;
> +}
> +
> +static int intel_dp_dsc_compute_pipe_bpp(struct intel_dp *intel_dp,
> + struct intel_crtc_state *pipe_config,
> + struct drm_connector_state *conn_state,
> + struct link_config_limits *limits,
> + int timeslots)
> +{
> + const struct drm_display_mode *adjusted_mode = &pipe_config->hw.adjusted_mode;
> + struct drm_i915_private *i915 = dp_to_i915(intel_dp);
> + u16 output_bpp, dsc_max_compressed_bpp = 0;
> + int forced_bpp, pipe_bpp;
> +
> + forced_bpp = intel_dp_force_dsc_pipe_bpp(intel_dp);
> +
> + if (forced_bpp) {
> + pipe_bpp = forced_bpp;
> + } else {
> + pipe_bpp = intel_dp_dsc_compute_max_bpp(intel_dp, conn_state->max_requested_bpc);
> +
> + if (!is_dsc_pipe_bpp_sufficient(i915, pipe_bpp)) {
> + drm_dbg_kms(&i915->drm,
> + "Computed BPC less than min supported by source for DSC\n");
> + return -EINVAL;
> + }
> + }
> + /*
> + * For now enable DSC for max link rate, max lane count.
> + * Optimize this later for the minimum possible link rate/lane count
> + * with DSC enabled for the requested mode.
> + */
> + pipe_config->port_clock = limits->max_rate;
> + pipe_config->lane_count = limits->max_lane_count;
> + dsc_max_compressed_bpp = intel_dp_dsc_get_max_compressed_bpp(i915,
> + pipe_config->port_clock,
> + pipe_config->lane_count,
> + adjusted_mode->crtc_clock,
> + adjusted_mode->crtc_hdisplay,
> + pipe_config->bigjoiner_pipes,
> + pipe_config->output_format,
> + pipe_bpp,
> + timeslots);
> + if (!dsc_max_compressed_bpp) {
> + drm_dbg_kms(&i915->drm, "Compressed BPP not supported\n");
> + return -EINVAL;
> + }
> +
> + output_bpp = intel_dp_output_bpp(pipe_config->output_format, pipe_bpp);
> +
> + pipe_config->dsc.compressed_bpp = min_t(u16, dsc_max_compressed_bpp, output_bpp);
> +
> + pipe_config->pipe_bpp = pipe_bpp;
> +
> + return 0;
> +}
> +
> +static int intel_edp_dsc_compute_pipe_bpp(struct intel_dp *intel_dp,
> + struct intel_crtc_state *pipe_config,
> + struct drm_connector_state *conn_state,
> + struct link_config_limits *limits)
> +{
> + struct drm_i915_private *i915 = dp_to_i915(intel_dp);
> + int pipe_bpp, forced_bpp;
> +
> + forced_bpp = intel_dp_force_dsc_pipe_bpp(intel_dp);
> +
> + if (forced_bpp) {
> + pipe_bpp = forced_bpp;
> + } else {
> + /* For eDP use max bpp that can be supported with DSC. */
> + pipe_bpp = intel_dp_dsc_compute_max_bpp(intel_dp,
> + conn_state->max_requested_bpc);
> + if (!is_dsc_pipe_bpp_sufficient(i915, pipe_bpp)) {
> + drm_dbg_kms(&i915->drm,
> + "Computed BPC less than min supported by source for DSC\n");
> + return -EINVAL;
> + }
> + }
> + pipe_config->port_clock = limits->max_rate;
> + pipe_config->lane_count = limits->max_lane_count;
> + pipe_config->dsc.compressed_bpp =
> + min_t(u16, drm_edp_dsc_sink_output_bpp(intel_dp->dsc_dpcd) >> 4,
> + pipe_bpp);
> +
> + pipe_config->pipe_bpp = pipe_bpp;
> +
> + return 0;
> +}
> +
> int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
> struct intel_crtc_state *pipe_config,
> struct drm_connector_state *conn_state,
> @@ -1721,44 +1830,28 @@ int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
> if (!intel_dp_dsc_supports_format(intel_dp, pipe_config->output_format))
> return -EINVAL;
>
> + /*
> + * compute pipe bpp is set to false for DP MST DSC case
> + * and compressed_bpp is calculated same time once
> + * vpci timeslots are allocated, because overall bpp
> + * calculation procedure is bit different for MST case.
> + */
> if (compute_pipe_bpp) {
> - int pipe_bpp;
> - int forced_bpp = intel_dp->force_dsc_bpc * 3;
> -
> - if (forced_bpp && is_dsc_pipe_bpp_sufficient(dev_priv, forced_bpp)) {
> - pipe_bpp = forced_bpp;
> - drm_dbg_kms(&dev_priv->drm, "Input DSC BPC forced to %d\n",
> - intel_dp->force_dsc_bpc);
> - } else {
> - drm_WARN(&dev_priv->drm, forced_bpp,
> - "Cannot force DSC BPC:%d, due to DSC BPC limits\n",
> - intel_dp->force_dsc_bpc);
> -
> - pipe_bpp = intel_dp_dsc_compute_max_bpp(intel_dp,
> - conn_state->max_requested_bpc);
> -
> - if (!is_dsc_pipe_bpp_sufficient(dev_priv, pipe_bpp)) {
> - drm_dbg_kms(&dev_priv->drm,
> - "Computed BPC less than min supported by source for DSC\n");
> - return -EINVAL;
> - }
> + if (intel_dp_is_edp(intel_dp))
> + ret = intel_edp_dsc_compute_pipe_bpp(intel_dp, pipe_config,
> + conn_state, limits);
> + else
> + ret = intel_dp_dsc_compute_pipe_bpp(intel_dp, pipe_config,
> + conn_state, limits, timeslots);
> + if (ret) {
> + drm_dbg_kms(&dev_priv->drm,
> + "No Valid pipe bpp for given mode ret = %d\n", ret);
> + return ret;
> }
> -
> - pipe_config->pipe_bpp = pipe_bpp;
> }
>
> - /*
> - * For now enable DSC for max link rate, max lane count.
> - * Optimize this later for the minimum possible link rate/lane count
> - * with DSC enabled for the requested mode.
> - */
> - pipe_config->port_clock = limits->max_rate;
> - pipe_config->lane_count = limits->max_lane_count;
> -
> + /* Calculate Slice count */
> if (intel_dp_is_edp(intel_dp)) {
> - pipe_config->dsc.compressed_bpp =
> - min_t(u16, drm_edp_dsc_sink_output_bpp(intel_dp->dsc_dpcd) >> 4,
> - pipe_config->pipe_bpp);
> pipe_config->dsc.slice_count =
> drm_dp_dsc_sink_max_slice_count(intel_dp->dsc_dpcd,
> true);
> @@ -1768,26 +1861,8 @@ int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
> return -EINVAL;
> }
> } else {
> - u16 dsc_max_compressed_bpp = 0;
> u8 dsc_dp_slice_count;
>
> - if (compute_pipe_bpp) {
> - dsc_max_compressed_bpp =
> - intel_dp_dsc_get_max_compressed_bpp(dev_priv,
> - pipe_config->port_clock,
> - pipe_config->lane_count,
> - adjusted_mode->crtc_clock,
> - adjusted_mode->crtc_hdisplay,
> - pipe_config->bigjoiner_pipes,
> - pipe_config->output_format,
> - pipe_config->pipe_bpp,
> - timeslots);
> - if (!dsc_max_compressed_bpp) {
> - drm_dbg_kms(&dev_priv->drm,
> - "Compressed BPP not supported\n");
> - return -EINVAL;
> - }
> - }
> dsc_dp_slice_count =
> intel_dp_dsc_get_slice_count(intel_dp,
> adjusted_mode->crtc_clock,
> @@ -1799,20 +1874,6 @@ int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
> return -EINVAL;
> }
>
> - /*
> - * compute pipe bpp is set to false for DP MST DSC case
> - * and compressed_bpp is calculated same time once
> - * vpci timeslots are allocated, because overall bpp
> - * calculation procedure is bit different for MST case.
> - */
> - if (compute_pipe_bpp) {
> - u16 output_bpp = intel_dp_output_bpp(pipe_config->output_format,
> - pipe_config->pipe_bpp);
> -
> - pipe_config->dsc.compressed_bpp = min_t(u16,
> - dsc_max_compressed_bpp,
> - output_bpp);
> - }
> pipe_config->dsc.slice_count = dsc_dp_slice_count;
> }
> /*
> --
> 2.40.1
>
