drm/amd/display: No need to keep track of unreffed clk sources

This simplifies clock source reprogramming a bit.
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc_resource.c

@@ -261,13 +261,12 @@ bool resource_construct(
 }
 
 
-bool resource_unreference_clock_source(
+void resource_unreference_clock_source(
 		struct resource_context *res_ctx,
 		const struct resource_pool *pool,
 		struct clock_source *clock_source)
 {
 	int i;
-	bool need_reset = false;
 
 	for (i = 0; i < pool->clk_src_count; i++) {
 		if (pool->clock_sources[i] != clock_source)
@@ -275,24 +274,11 @@ bool resource_unreference_clock_source(
 
 		res_ctx->clock_source_ref_count[i]--;
 
-		if (res_ctx->clock_source_ref_count[i] == 0) {
-			res_ctx->clock_source_changed[i] = true;
-			need_reset = true;
-		}
-
 		break;
 	}
 
-	if (pool->dp_clock_source == clock_source) {
+	if (pool->dp_clock_source == clock_source)
 		res_ctx->dp_clock_source_ref_count--;
-
-		if (res_ctx->dp_clock_source_ref_count == 0) {
-			res_ctx->dp_clock_source_changed = true;
-			need_reset = true;
-		}
-	}
-
-	return need_reset;
 }
 
 void resource_reference_clock_source(

drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c

@@ -1640,6 +1640,8 @@ static void dce110_reset_hw_ctx_wrap(
 
 		if (!pipe_ctx->stream ||
 				pipe_need_reprogram(pipe_ctx_old, pipe_ctx)) {
+			struct clock_source *old_clk = pipe_ctx_old->clock_source;
+
 			core_link_disable_stream(pipe_ctx_old);
 			pipe_ctx_old->stream_res.tg->funcs->set_blank(pipe_ctx_old->stream_res.tg, true);
 			if (!hwss_wait_for_blank_complete(pipe_ctx_old->stream_res.tg)) {
@@ -1650,27 +1652,14 @@ static void dce110_reset_hw_ctx_wrap(
 			pipe_ctx_old->plane_res.mi->funcs->free_mem_input(
 					pipe_ctx_old->plane_res.mi, dc->current_state->stream_count);
 
+			if (old_clk)
+				old_clk->funcs->cs_power_down(old_clk);
+
 			dc->hwss.power_down_front_end(dc, pipe_ctx_old->pipe_idx);
 
 			pipe_ctx_old->stream = NULL;
 		}
 	}
-
-	/* power down changed clock sources */
-	for (i = 0; i < dc->res_pool->clk_src_count; i++)
-		if (context->res_ctx.clock_source_changed[i]) {
-			struct clock_source *clk = dc->res_pool->clock_sources[i];
-
-			clk->funcs->cs_power_down(clk);
-			context->res_ctx.clock_source_changed[i] = false;
-		}
-
-	if (context->res_ctx.dp_clock_source_changed) {
-		struct clock_source *clk = dc->res_pool->dp_clock_source;
-
-		clk->funcs->cs_power_down(clk);
-		context->res_ctx.clock_source_changed[i] = false;
-	}
 }
 
 

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c

@@ -1265,22 +1265,6 @@ static void reset_hw_ctx_wrap(
 			plane_atomic_power_down(dc, i);
 	}
 
-	/* power down changed clock sources */
-	for (i = 0; i < dc->res_pool->clk_src_count; i++)
-		if (context->res_ctx.clock_source_changed[i]) {
-			struct clock_source *clk = dc->res_pool->clock_sources[i];
-
-			clk->funcs->cs_power_down(clk);
-			context->res_ctx.clock_source_changed[i] = false;
-		}
-
-	if (context->res_ctx.dp_clock_source_changed) {
-		struct clock_source *clk = dc->res_pool->dp_clock_source;
-
-		clk->funcs->cs_power_down(clk);
-		context->res_ctx.dp_clock_source_changed = false;
-	}
-
 	/* Reset Back End*/
 	for (i = dc->res_pool->pipe_count - 1; i >= 0 ; i--) {
 		struct pipe_ctx *pipe_ctx_old =
@@ -1291,9 +1275,16 @@ static void reset_hw_ctx_wrap(
 			continue;
 
 		if (!pipe_ctx->stream ||
-				pipe_need_reprogram(pipe_ctx_old, pipe_ctx))
+				pipe_need_reprogram(pipe_ctx_old, pipe_ctx)) {
+			struct clock_source *old_clk = pipe_ctx_old->clock_source;
+
 			reset_back_end_for_pipe(dc, pipe_ctx_old, dc->current_state);
+
+			if (old_clk)
+				old_clk->funcs->cs_power_down(old_clk);
+		}
 	}
+
 }
 
 static bool patch_address_for_sbs_tb_stereo(

drivers/gpu/drm/amd/display/dc/inc/core_types.h

@@ -213,9 +213,7 @@ struct resource_context {
 	bool is_stream_enc_acquired[MAX_PIPES * 2];
 	bool is_audio_acquired[MAX_PIPES];
 	uint8_t clock_source_ref_count[MAX_CLOCK_SOURCES];
-	bool clock_source_changed[MAX_CLOCK_SOURCES];
 	uint8_t dp_clock_source_ref_count;
-	bool dp_clock_source_changed;
 };
 
 struct dce_bw_output {

drivers/gpu/drm/amd/display/dc/inc/resource.h

@@ -92,7 +92,7 @@ enum dc_status resource_build_scaling_params_for_context(
 
 void resource_build_info_frame(struct pipe_ctx *pipe_ctx);
 
-bool resource_unreference_clock_source(
+void resource_unreference_clock_source(
 		struct resource_context *res_ctx,
 		const struct resource_pool *pool,
 		struct clock_source *clock_source);