drm/amd/display: add set and get clock for testing purposes

add dc_set_clock
add dc_get_clock

this is for testing and diagnostics to get/set DPPCLK and DISPCLK.
Signed-off-by: Charlene Liu <charlene.liu@amd.com>
Reviewed-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/clk_mgr/dcn20/dcn20_clk_mgr.c

@@ -316,11 +316,32 @@ void dcn2_enable_pme_wa(struct clk_mgr *clk_mgr_base)
 	}
 }
 
+void dcn2_get_clock(struct clk_mgr *clk_mgr,
+		struct dc_state *context,
+			enum dc_clock_type clock_type,
+			struct dc_clock_config *clock_cfg)
+{
+
+	if (clock_type == DC_CLOCK_TYPE_DISPCLK) {
+		clock_cfg->max_clock_khz = context->bw_ctx.bw.dcn.clk.max_supported_dispclk_khz;
+		clock_cfg->min_clock_khz = DCN_MINIMUM_DISPCLK_Khz;
+		clock_cfg->current_clock_khz = clk_mgr->clks.dispclk_khz;
+		clock_cfg->bw_requirequired_clock_khz = context->bw_ctx.bw.dcn.clk.bw_dispclk_khz;
+	}
+	if (clock_type == DC_CLOCK_TYPE_DPPCLK) {
+		clock_cfg->max_clock_khz = context->bw_ctx.bw.dcn.clk.max_supported_dppclk_khz;
+		clock_cfg->min_clock_khz = DCN_MINIMUM_DPPCLK_Khz;
+		clock_cfg->current_clock_khz = clk_mgr->clks.dppclk_khz;
+		clock_cfg->bw_requirequired_clock_khz = context->bw_ctx.bw.dcn.clk.bw_dppclk_khz;
+	}
+}
+
 static struct clk_mgr_funcs dcn2_funcs = {
 	.get_dp_ref_clk_frequency = dce12_get_dp_ref_freq_khz,
 	.update_clocks = dcn2_update_clocks,
 	.init_clocks = dcn2_init_clocks,
-	.enable_pme_wa = dcn2_enable_pme_wa
+	.enable_pme_wa = dcn2_enable_pme_wa,
+	.get_clock = dcn2_get_clock,
 };
 
 

drivers/gpu/drm/amd/display/dc/clk_mgr/dcn20/dcn20_clk_mgr.h

@@ -45,4 +45,9 @@ void dcn20_clk_mgr_construct(struct dc_context *ctx,
 
 uint32_t dentist_get_did_from_divider(int divider);
 
+void dcn2_get_clock(struct clk_mgr *clk_mgr,
+		struct dc_state *context,
+			enum dc_clock_type clock_type,
+			struct dc_clock_config *clock_cfg);
+
 #endif //__DCN20_CLK_MGR_H__

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

@@ -2431,3 +2431,14 @@ void get_clock_requirements_for_state(struct dc_state *state, struct AsicStateEx
 	info->fClock					= (unsigned int)state->bw_ctx.bw.dcn.clk.fclk_khz;
 	info->phyClock					= (unsigned int)state->bw_ctx.bw.dcn.clk.phyclk_khz;
 }
+enum dc_status dc_set_clock(struct dc *dc, enum dc_clock_type clock_type, uint32_t clk_khz, uint32_t stepping)
+{
+	if (dc->hwss.set_clock)
+		return dc->hwss.set_clock(dc, clock_type, clk_khz, stepping);
+	return DC_ERROR_UNEXPECTED;
+}
+void dc_get_clock(struct dc *dc, enum dc_clock_type clock_type, struct dc_clock_config *clock_cfg)
+{
+	if (dc->hwss.get_clock)
+		dc->hwss.get_clock(dc, clock_type, clock_cfg);
+}

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

@@ -252,7 +252,10 @@ enum wm_report_mode {
 struct dc_clocks {
 	int dispclk_khz;
 	int max_supported_dppclk_khz;
+	int max_supported_dispclk_khz;
 	int dppclk_khz;
+	int bw_dppclk_khz; /*a copy of dppclk_khz*/
+	int bw_dispclk_khz;
 	int dcfclk_khz;
 	int socclk_khz;
 	int dcfclk_deep_sleep_khz;
@@ -1041,6 +1044,8 @@ unsigned int dc_get_target_backlight_pwm(struct dc *dc);
 
 bool dc_is_dmcu_initialized(struct dc *dc);
 
+enum dc_status dc_set_clock(struct dc *dc, enum dc_clock_type clock_type, uint32_t clk_khz, uint32_t stepping);
+void dc_get_clock(struct dc *dc, enum dc_clock_type clock_type, struct dc_clock_config *clock_cfg);
 #if defined(CONFIG_DRM_AMD_DC_DSC_SUPPORT)
 /*******************************************************************************
  * DSC Interfaces

drivers/gpu/drm/amd/display/dc/dc_types.h

@@ -726,6 +726,19 @@ struct AsicStateEx {
 	unsigned int phyClock;
 };
 
+
+enum dc_clock_type {
+	DC_CLOCK_TYPE_DISPCLK = 0,
+	DC_CLOCK_TYPE_DPPCLK        = 1,
+};
+
+struct dc_clock_config {
+	uint32_t max_clock_khz;
+	uint32_t min_clock_khz;
+	uint32_t bw_requirequired_clock_khz;
+	uint32_t current_clock_khz;/*current clock in use*/
+};
+
 #ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
 /* DSC DPCD capabilities */
 union dsc_slice_caps1 {

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

@@ -3069,6 +3069,56 @@ static void dcn10_send_immediate_sdp_message(struct pipe_ctx *pipe_ctx,
 				sdp_message_size);
 	}
 }
+static enum dc_status dcn10_set_clock(struct dc *dc,
+			enum dc_clock_type clock_type,
+			uint32_t clk_khz,
+			uint32_t stepping)
+{
+	struct dc_state *context = dc->current_state;
+	struct dc_clock_config clock_cfg = {0};
+	struct dc_clocks *current_clocks = &context->bw_ctx.bw.dcn.clk;
+
+	if (dc->clk_mgr && dc->clk_mgr->funcs->get_clock)
+				dc->clk_mgr->funcs->get_clock(dc->clk_mgr,
+						context, clock_type, &clock_cfg);
+
+	if (!dc->clk_mgr->funcs->get_clock)
+		return DC_FAIL_UNSUPPORTED_1;
+
+	if (clk_khz > clock_cfg.max_clock_khz)
+		return DC_FAIL_CLK_EXCEED_MAX;
+
+	if (clk_khz < clock_cfg.min_clock_khz)
+		return DC_FAIL_CLK_BELOW_MIN;
+
+	if (clk_khz < clock_cfg.bw_requirequired_clock_khz)
+		return DC_FAIL_CLK_BELOW_CFG_REQUIRED;
+
+	/*update internal request clock for update clock use*/
+	if (clock_type == DC_CLOCK_TYPE_DISPCLK)
+		current_clocks->dispclk_khz = clk_khz;
+	else if (clock_type == DC_CLOCK_TYPE_DPPCLK)
+		current_clocks->dppclk_khz = clk_khz;
+	else
+		return DC_ERROR_UNEXPECTED;
+
+	if (dc->clk_mgr && dc->clk_mgr->funcs->update_clocks)
+				dc->clk_mgr->funcs->update_clocks(dc->clk_mgr,
+				context, true);
+	return DC_OK;
+
+}
+
+static void dcn10_get_clock(struct dc *dc,
+			enum dc_clock_type clock_type,
+			struct dc_clock_config *clock_cfg)
+{
+	struct dc_state *context = dc->current_state;
+
+	if (dc->clk_mgr && dc->clk_mgr->funcs->get_clock)
+				dc->clk_mgr->funcs->get_clock(dc->clk_mgr, context, clock_type, clock_cfg);
+
+}
 
 static const struct hw_sequencer_funcs dcn10_funcs = {
 	.program_gamut_remap = program_gamut_remap,
@@ -3123,7 +3173,8 @@ static const struct hw_sequencer_funcs dcn10_funcs = {
 	.enable_stream_gating = NULL,
 	.setup_periodic_interrupt = dcn10_setup_periodic_interrupt,
 	.setup_vupdate_interrupt = dcn10_setup_vupdate_interrupt,
-	.did_underflow_occur = dcn10_did_underflow_occur
+	.set_clock = dcn10_set_clock,
+	.get_clock = dcn10_get_clock,
 };
 
 

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c

@@ -2398,6 +2398,11 @@ void dcn20_calculate_dlg_params(
 		context->res_ctx.pipe_ctx[i].pipe_dlg_param = pipes[pipe_idx].pipe.dest;
 		pipe_idx++;
 	}
+	/*save a original dppclock copy*/
+	context->bw_ctx.bw.dcn.clk.bw_dppclk_khz = context->bw_ctx.bw.dcn.clk.dppclk_khz;
+	context->bw_ctx.bw.dcn.clk.bw_dispclk_khz = context->bw_ctx.bw.dcn.clk.dispclk_khz;
+	context->bw_ctx.bw.dcn.clk.max_supported_dppclk_khz = context->bw_ctx.dml.soc.clock_limits[vlevel].dppclk_mhz*1000;
+	context->bw_ctx.bw.dcn.clk.max_supported_dispclk_khz = context->bw_ctx.dml.soc.clock_limits[vlevel].dispclk_mhz*1000;
 
 	for (i = 0, pipe_idx = 0; i < dc->res_pool->pipe_count; i++) {
 		bool cstate_en = context->bw_ctx.dml.vba.PrefetchMode[vlevel][context->bw_ctx.dml.vba.maxMpcComb] != 2;

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

@@ -48,6 +48,9 @@ enum dc_status {
 	DC_NO_DSC_RESOURCE = 17,
 #endif
 	DC_FAIL_UNSUPPORTED_1 = 18,
+	DC_FAIL_CLK_EXCEED_MAX = 21,
+	DC_FAIL_CLK_BELOW_MIN = 22, /*THIS IS MIN PER IP*/
+	DC_FAIL_CLK_BELOW_CFG_REQUIRED = 23, /*THIS IS hard_min in PPLIB*/
 
 	DC_ERROR_UNEXPECTED = -1
 };

drivers/gpu/drm/amd/display/dc/inc/hw/clk_mgr.h

@@ -28,6 +28,9 @@
 
 #include "dc.h"
 
+#define DCN_MINIMUM_DISPCLK_Khz 100000
+#define DCN_MINIMUM_DPPCLK_Khz 100000
+
 /* Public interfaces */
 
 struct clk_states {
@@ -51,6 +54,10 @@ struct clk_mgr_funcs {
 	void (*init_clocks)(struct clk_mgr *clk_mgr);
 
 	void (*enable_pme_wa) (struct clk_mgr *clk_mgr);
+	void (*get_clock)(struct clk_mgr *clk_mgr,
+			struct dc_state *context,
+			enum dc_clock_type clock_type,
+			struct dc_clock_config *clock_cfg);
 };
 
 struct clk_mgr {

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

@@ -294,6 +294,15 @@ struct hw_sequencer_funcs {
 	void (*disable_writeback)(struct dc *dc,
 			unsigned int dwb_pipe_inst);
 #endif
+	enum dc_status (*set_clock)(struct dc *dc,
+			enum dc_clock_type clock_type,
+			uint32_t clk_khz,
+			uint32_t stepping);
+
+	void (*get_clock)(struct dc *dc,
+			enum dc_clock_type clock_type,
+			struct dc_clock_config *clock_cfg);
+
 };
 
 void color_space_to_black_color(