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drm/amd/display: Force p-state disallow if leaving no plane config
[Description] - When we're in a no plane config, DCN is always asserting P-State allow - This creates a scenario where the P-State blackout can start just as VUPDATE takes place and transitions the DCN config to a one where one or more HUBP's are active which can result in underflow - To fix this issue, force p-state disallow and unforce after the transition from no planes case -> one or more planes active Reviewed-by: Samson Tam <samson.tam@amd.com> Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com> Signed-off-by: Alvin Lee <alvin.lee2@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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1 changed files with 20 additions and 0 deletions
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@ -1877,6 +1877,8 @@ void dcn20_program_front_end_for_ctx(
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int i;
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struct dce_hwseq *hws = dc->hwseq;
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DC_LOGGER_INIT(dc->ctx->logger);
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unsigned int prev_hubp_count = 0;
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unsigned int hubp_count = 0;
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if (resource_is_pipe_topology_changed(dc->current_state, context))
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resource_log_pipe_topology_update(dc, context);
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@ -1894,6 +1896,20 @@ void dcn20_program_front_end_for_ctx(
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}
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}
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for (i = 0; i < dc->res_pool->pipe_count; i++) {
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if (dc->current_state->res_ctx.pipe_ctx[i].plane_state)
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prev_hubp_count++;
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if (context->res_ctx.pipe_ctx[i].plane_state)
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hubp_count++;
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}
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if (prev_hubp_count == 0 && hubp_count > 0) {
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if (dc->res_pool->hubbub->funcs->force_pstate_change_control)
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dc->res_pool->hubbub->funcs->force_pstate_change_control(
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dc->res_pool->hubbub, true, false);
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udelay(500);
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}
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/* Set pipe update flags and lock pipes */
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for (i = 0; i < dc->res_pool->pipe_count; i++)
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dcn20_detect_pipe_changes(&dc->current_state->res_ctx.pipe_ctx[i],
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@ -2039,6 +2055,10 @@ void dcn20_post_unlock_program_front_end(
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}
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}
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if (dc->res_pool->hubbub->funcs->force_pstate_change_control)
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dc->res_pool->hubbub->funcs->force_pstate_change_control(
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dc->res_pool->hubbub, false, false);
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for (i = 0; i < dc->res_pool->pipe_count; i++) {
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struct pipe_ctx *pipe = &context->res_ctx.pipe_ctx[i];
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