drm/amd/display: cache pwl params and scl_data to avoid extra programming

This saves us about 5000 reg writes per full update. This translates to about
40000 writes over the course of single eDP bootup.
Signed-off-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@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/dcn10/dcn10_dpp.c

@@ -178,32 +178,14 @@ void dpp_reset(struct dpp *dpp_base)
 	dpp->filter_h = NULL;
 	dpp->filter_v = NULL;
 
-	/* set boundary mode to 0 */
-	REG_SET(DSCL_CONTROL, 0, SCL_BOUNDARY_MODE, 0);
+	memset(&dpp->scl_data, 0, sizeof(dpp->scl_data));
+	memset(&dpp->pwl_data, 0, sizeof(dpp->pwl_data));
 }
 
 
 
 static void dpp1_cm_set_regamma_pwl(
-	struct dpp *dpp_base, const struct pwl_params *params)
-{
-	struct dcn10_dpp *dpp = TO_DCN10_DPP(dpp_base);
-
-	dpp1_cm_power_on_regamma_lut(dpp_base, true);
-	dpp1_cm_configure_regamma_lut(dpp_base, dpp->is_write_to_ram_a_safe);
-
-	if (dpp->is_write_to_ram_a_safe)
-		dpp1_cm_program_regamma_luta_settings(dpp_base, params);
-	else
-		dpp1_cm_program_regamma_lutb_settings(dpp_base, params);
-
-	dpp1_cm_program_regamma_lut(
-			dpp_base, params->rgb_resulted, params->hw_points_num);
-}
-
-static void dpp1_cm_set_regamma_mode(
-	struct dpp *dpp_base,
-	enum opp_regamma mode)
+	struct dpp *dpp_base, const struct pwl_params *params, enum opp_regamma mode)
 {
 	struct dcn10_dpp *dpp = TO_DCN10_DPP(dpp_base);
 	uint32_t re_mode = 0;
@@ -221,13 +203,27 @@ static void dpp1_cm_set_regamma_mode(
 		re_mode = 2;
 		break;
 	case OPP_REGAMMA_USER:
+		if (memcmp(&dpp->pwl_data, params, sizeof(*params)) == 0)
+			return;
+
+		dpp1_cm_power_on_regamma_lut(dpp_base, true);
+		dpp1_cm_configure_regamma_lut(dpp_base, dpp->is_write_to_ram_a_safe);
+
+		if (dpp->is_write_to_ram_a_safe)
+			dpp1_cm_program_regamma_luta_settings(dpp_base, params);
+		else
+			dpp1_cm_program_regamma_lutb_settings(dpp_base, params);
+
+		dpp1_cm_program_regamma_lut(
+				dpp_base, params->rgb_resulted, params->hw_points_num);
+		dpp->pwl_data = *params;
+
 		re_mode = dpp->is_write_to_ram_a_safe ? 3 : 4;
 		dpp->is_write_to_ram_a_safe = !dpp->is_write_to_ram_a_safe;
 		break;
 	default:
 		break;
 	}
-
 	REG_SET(CM_RGAM_CONTROL, 0, CM_RGAM_LUT_MODE, re_mode);
 	REG_UPDATE_2(OBUF_CONTROL,
 			OBUF_BYPASS, obuf_bypass,
@@ -454,7 +450,6 @@ static const struct dpp_funcs dcn10_dpp_funcs = {
 		.opp_program_regamma_lutb_settings = dpp1_cm_program_regamma_lutb_settings,
 		.opp_program_regamma_luta_settings = dpp1_cm_program_regamma_luta_settings,
 		.opp_program_regamma_pwl = dpp1_cm_set_regamma_pwl,
-		.opp_set_regamma_mode = dpp1_cm_set_regamma_mode,
 		.ipp_program_bias_and_scale = dpp1_program_bias_and_scale,
 		.ipp_set_degamma = dpp1_set_degamma,
 		.ipp_program_input_lut		= dpp1_program_input_lut,

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_dpp.h

@@ -54,7 +54,6 @@
 	SRI(LB_MEMORY_CTRL, DSCL, id), \
 	SRI(DSCL_AUTOCAL, DSCL, id), \
 	SRI(SCL_BLACK_OFFSET, DSCL, id), \
-	SRI(DSCL_CONTROL, DSCL, id), \
 	SRI(SCL_TAP_CONTROL, DSCL, id), \
 	SRI(SCL_COEF_RAM_TAP_SELECT, DSCL, id), \
 	SRI(SCL_COEF_RAM_TAP_DATA, DSCL, id), \
@@ -194,7 +193,6 @@
 	TF_SF(DSCL0_DSCL_AUTOCAL, AUTOCAL_PIPE_ID, mask_sh),\
 	TF_SF(DSCL0_SCL_BLACK_OFFSET, SCL_BLACK_OFFSET_RGB_Y, mask_sh),\
 	TF_SF(DSCL0_SCL_BLACK_OFFSET, SCL_BLACK_OFFSET_CBCR, mask_sh),\
-	TF_SF(DSCL0_DSCL_CONTROL, SCL_BOUNDARY_MODE, mask_sh),\
 	TF_SF(DSCL0_SCL_TAP_CONTROL, SCL_V_NUM_TAPS, mask_sh),\
 	TF_SF(DSCL0_SCL_TAP_CONTROL, SCL_H_NUM_TAPS, mask_sh),\
 	TF_SF(DSCL0_SCL_TAP_CONTROL, SCL_V_NUM_TAPS_C, mask_sh),\
@@ -440,7 +438,6 @@
 	type AUTOCAL_PIPE_ID; \
 	type SCL_BLACK_OFFSET_RGB_Y; \
 	type SCL_BLACK_OFFSET_CBCR; \
-	type SCL_BOUNDARY_MODE; \
 	type SCL_V_NUM_TAPS; \
 	type SCL_H_NUM_TAPS; \
 	type SCL_V_NUM_TAPS_C; \
@@ -1038,7 +1035,6 @@ struct dcn_dpp_registers {
 	uint32_t LB_MEMORY_CTRL;
 	uint32_t DSCL_AUTOCAL;
 	uint32_t SCL_BLACK_OFFSET;
-	uint32_t DSCL_CONTROL;
 	uint32_t SCL_TAP_CONTROL;
 	uint32_t SCL_COEF_RAM_TAP_SELECT;
 	uint32_t SCL_COEF_RAM_TAP_DATA;
@@ -1284,6 +1280,8 @@ struct dcn10_dpp {
 	int lb_memory_size;
 	int lb_bits_per_entry;
 	bool is_write_to_ram_a_safe;
+	struct scaler_data scl_data;
+	struct pwl_params pwl_data;
 };
 
 enum dcn10_input_csc_select {

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_dpp_dscl.c

@@ -648,6 +648,8 @@ void dpp1_dscl_set_scaler_manual_scale(
 	bool ycbcr = scl_data->format >= PIXEL_FORMAT_VIDEO_BEGIN
 				&& scl_data->format <= PIXEL_FORMAT_VIDEO_END;
 
+	if (memcmp(&dpp->scl_data, scl_data, sizeof(*scl_data)) == 0)
+		return;
 	/* Recout */
 	dpp1_dscl_set_recout(dpp, &scl_data->recout);
 
@@ -699,4 +701,5 @@ void dpp1_dscl_set_scaler_manual_scale(
 		SCL_H_NUM_TAPS_C, scl_data->taps.h_taps_c - 1);
 
 	dpp1_dscl_set_scl_filter(dpp, scl_data, ycbcr);
+	dpp->scl_data = *scl_data;
 }

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

@@ -1235,13 +1235,12 @@ static bool dcn10_set_output_transfer_func(
 			TF_TYPE_PREDEFINED &&
 		stream->out_transfer_func->tf ==
 			TRANSFER_FUNCTION_SRGB) {
-		dpp->funcs->opp_set_regamma_mode(dpp, OPP_REGAMMA_SRGB);
+		dpp->funcs->opp_program_regamma_pwl(dpp, NULL, OPP_REGAMMA_SRGB);
 	} else if (dcn10_translate_regamma_to_hw_format(
 				stream->out_transfer_func, &dpp->regamma_params)) {
-			dpp->funcs->opp_program_regamma_pwl(dpp, &dpp->regamma_params);
-			dpp->funcs->opp_set_regamma_mode(dpp, OPP_REGAMMA_USER);
+			dpp->funcs->opp_program_regamma_pwl(dpp, &dpp->regamma_params, OPP_REGAMMA_USER);
 	} else {
-		dpp->funcs->opp_set_regamma_mode(dpp, OPP_REGAMMA_BYPASS);
+		dpp->funcs->opp_program_regamma_pwl(dpp, NULL, OPP_REGAMMA_BYPASS);
 	}
 
 	return true;
@@ -2118,8 +2117,7 @@ static void dcn10_apply_ctx_for_surface(
 
 	if (num_planes == 0) {
 		for (i = dc->res_pool->pipe_count - 1; i >= 0 ; i--) {
-			struct pipe_ctx *old_pipe_ctx =
-							&dc->current_state->res_ctx.pipe_ctx[i];
+			struct pipe_ctx *old_pipe_ctx = &dc->current_state->res_ctx.pipe_ctx[i];
 
 			if (old_pipe_ctx->stream_res.tg && old_pipe_ctx->stream_res.tg->inst == be_idx) {
 				old_pipe_ctx->stream_res.tg->funcs->set_blank(old_pipe_ctx->stream_res.tg, true);

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

@@ -92,10 +92,8 @@ struct dpp_funcs {
 			const struct pwl_params *params);
 
 	void (*opp_program_regamma_pwl)(
-		struct dpp *dpp, const struct pwl_params *params);
-
-	void (*opp_set_regamma_mode)(
-			struct dpp *dpp_base,
+		struct dpp *dpp,
+		const struct pwl_params *params,
 		enum opp_regamma mode);
 
 	void (*ipp_program_bias_and_scale)(