Commit 128c1ca0 authored by Alvin Lee's avatar Alvin Lee Committed by Alex Deucher
Browse files

drm/amd/display: Update DTBCLK for DCN32 



[Why&How]
- Implement interface to program DTBCLK DTO’s
  according to reference DTBCLK returned by PMFW
- This is required because DTO programming
  requires exact DTBCLK reference freq or it could
  result in underflow

Acked-by: default avatarAurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: default avatarAlvin Lee <Alvin.Lee2@amd.com>
Tested-by: default avatarDaniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 3306ba4b

drivers/gpu/drm/amd/display/dc/clk_mgr/dcn32/dcn32_clk_mgr.c

+27 −0
Original line number Diff line number Diff line
@@ -233,6 +233,32 @@ void dcn32_init_clocks(struct clk_mgr *clk_mgr_base) 
	DC_FP_END();

}



static void dcn32_update_clocks_update_dtb_dto(struct clk_mgr_internal *clk_mgr,

			struct dc_state *context,

			int ref_dtbclk_khz)

{

	struct dccg *dccg = clk_mgr->dccg;

	uint32_t tg_mask = 0;

	int i;



	for (i = 0; i < clk_mgr->base.ctx->dc->res_pool->pipe_count; i++) {

		struct pipe_ctx *pipe_ctx = &context->res_ctx.pipe_ctx[i];

		struct dtbclk_dto_params dto_params = {0};



		/* use mask to program DTO once per tg */

		if (pipe_ctx->stream_res.tg &&

				!(tg_mask & (1 << pipe_ctx->stream_res.tg->inst))) {

			tg_mask |= (1 << pipe_ctx->stream_res.tg->inst);



			dto_params.otg_inst = pipe_ctx->stream_res.tg->inst;

			dto_params.ref_dtbclk_khz = ref_dtbclk_khz;



			dccg->funcs->set_dtbclk_dto(clk_mgr->dccg, &dto_params);

			//dccg->funcs->set_audio_dtbclk_dto(clk_mgr->dccg, &dto_params);

		}

	}

}



/* Since DPPCLK request to PMFW needs to be exact (due to DPP DTO programming),

 * update DPPCLK to be the exact frequency that will be set after the DPPCLK

 * divider is updated. This will prevent rounding issues that could cause DPP
@@ -570,6 +596,7 @@ static void dcn32_update_clocks(struct clk_mgr *clk_mgr_base, 
		/* DCCG requires KHz precision for DTBCLK */

		clk_mgr_base->clks.ref_dtbclk_khz =

				dcn32_smu_set_hard_min_by_freq(clk_mgr, PPCLK_DTBCLK, khz_to_mhz_ceil(new_clocks->ref_dtbclk_khz));

		dcn32_update_clocks_update_dtb_dto(clk_mgr, context, clk_mgr_base->clks.ref_dtbclk_khz);

	}



	if (dc->config.forced_clocks == false || (force_reset && safe_to_lower)) {