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linux-7.2.3/drivers/gpu/drm/amd/display/dc/hwss/dcn42b/dcn42b_hwseq.c

@@ -0,0 +1,238 @@
+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright 2026 Advanced Micro Devices, Inc.
+ */
+
+#include "dm_services.h"
+#include "core_types.h"
+#include "resource.h"
+#include "dce/dce_hwseq.h"
+#include "dcn10/dcn10_hwseq.h"
+#include "reg_helper.h"
+#include "hubp.h"
+#include "dchubbub.h"
+#include "timing_generator.h"
+#include "opp.h"
+#include "mpc.h"
+#include "dcn42b_hwseq.h"
+
+#define CTX \
+	hws->ctx
+
+#define REG(reg)\
+	hws->regs->reg
+
+#define DC_LOGGER \
+	hws->ctx->logger
+
+#undef FN
+#define FN(reg_name, field_name) \
+	hws->shifts->field_name, hws->masks->field_name
+
+/*
+ * dcn42b_init_pipes - Initialize pipes for dcn42b
+ *
+ * This function is modeled after dcn10_init_pipes but handles the case
+ * where num_timing_generator != num_pipes (e.g., 3 TGs but 4 pipes).
+ *
+ * For dcn42b:
+ * - num_timing_generator = 3
+ * - num_pipes (num_dpp) = 4
+ *
+ * The key difference is that we iterate over timing generators separately
+ * from pipes to avoid accessing timing_generators[i] when i >= num_timing_generator.
+ */
+void dcn42b_init_pipes(struct dc *dc, struct dc_state *context)
+{
+	uint8_t i;
+	struct dce_hwseq *hws = dc->hwseq;
+	struct hubbub *hubbub = dc->res_pool->hubbub;
+	bool can_apply_seamless_boot = false;
+	bool tg_enabled[MAX_PIPES] = {false};
+
+	for (i = 0; i < context->stream_count; i++) {
+		if (context->streams[i]->apply_seamless_boot_optimization) {
+			can_apply_seamless_boot = true;
+			break;
+		}
+	}
+
+	for (i = 0; i < dc->res_pool->timing_generator_count; i++) {
+		struct timing_generator *tg = dc->res_pool->timing_generators[i];
+		struct pipe_ctx *pipe_ctx = &context->res_ctx.pipe_ctx[i];
+
+		/* There is assumption that pipe_ctx is not mapping irregularly
+		 * to non-preferred front end. If pipe_ctx->stream is not NULL,
+		 * we will use the pipe, so don't disable
+		 */
+		if (pipe_ctx->stream != NULL && can_apply_seamless_boot)
+			continue;
+
+		/* Blank controller using driver code instead of
+		 * command table.
+		 */
+		if (tg->funcs->is_tg_enabled(tg)) {
+			if (hws->funcs.init_blank != NULL) {
+				hws->funcs.init_blank(dc, tg);
+				tg->funcs->lock(tg);
+			} else {
+				tg->funcs->lock(tg);
+				tg->funcs->set_blank(tg, true);
+				hwss_wait_for_blank_complete(tg);
+			}
+		}
+	}
+
+	/* Reset det size */
+	for (i = 0; i < dc->res_pool->pipe_count; i++) {
+		struct pipe_ctx *pipe_ctx = &context->res_ctx.pipe_ctx[i];
+		struct hubp *hubp = dc->res_pool->hubps[i];
+
+		/* Do not need to reset for seamless boot */
+		if (pipe_ctx->stream != NULL && can_apply_seamless_boot)
+			continue;
+
+		if (hubbub && hubp) {
+			if (hubbub->funcs->program_det_size)
+				hubbub->funcs->program_det_size(hubbub, hubp->inst, 0);
+			if (hubbub->funcs->program_det_segments)
+				hubbub->funcs->program_det_segments(hubbub, hubp->inst, 0);
+		}
+	}
+
+	/* num_opp will be equal to number of mpcc */
+	for (i = 0; i < dc->res_pool->res_cap->num_opp; i++) {
+		struct pipe_ctx *pipe_ctx = &context->res_ctx.pipe_ctx[i];
+
+		/* Cannot reset the MPC mux if seamless boot */
+		if (pipe_ctx->stream != NULL && can_apply_seamless_boot)
+			continue;
+
+		dc->res_pool->mpc->funcs->mpc_init_single_inst(
+				dc->res_pool->mpc, i);
+	}
+
+	/* initialize DWB pointer to MCIF_WB */
+	for (i = 0; i < dc->res_pool->res_cap->num_dwb; i++)
+		dc->res_pool->dwbc[i]->mcif = dc->res_pool->mcif_wb[i];
+
+	for (i = 0; i < dc->res_pool->timing_generator_count; i++) {
+		struct timing_generator *tg = dc->res_pool->timing_generators[i];
+		struct hubp *hubp = dc->res_pool->hubps[i];
+		struct dpp *dpp = dc->res_pool->dpps[i];
+		struct pipe_ctx *pipe_ctx = &context->res_ctx.pipe_ctx[i];
+
+		/* There is assumption that pipe_ctx is not mapping irregularly
+		 * to non-preferred front end. If pipe_ctx->stream is not NULL,
+		 * we will use the pipe, so don't disable
+		 */
+		if (can_apply_seamless_boot &&
+			pipe_ctx->stream != NULL &&
+			pipe_ctx->stream_res.tg->funcs->is_tg_enabled(
+				pipe_ctx->stream_res.tg)) {
+			// Enable double buffering for OTG_BLANK no matter if
+			// seamless boot is enabled or not to suppress global sync
+			// signals when OTG blanked. This is to prevent pipe from
+			// requesting data while in PSR.
+			tg->funcs->tg_init(tg);
+			hubp->power_gated = true;
+			tg_enabled[i] = true;
+			continue;
+		}
+
+		/* Disable on the current state so the new one isn't cleared. */
+		pipe_ctx = &dc->current_state->res_ctx.pipe_ctx[i];
+
+		hubp->funcs->hubp_reset(hubp);
+		dpp->funcs->dpp_reset(dpp);
+
+		pipe_ctx->stream_res.tg = tg;
+		pipe_ctx->pipe_idx = i;
+
+		pipe_ctx->plane_res.hubp = hubp;
+		pipe_ctx->plane_res.dpp = dpp;
+		pipe_ctx->plane_res.mpcc_inst = (uint8_t)dpp->inst;
+		hubp->mpcc_id = dpp->inst;
+		hubp->opp_id = OPP_ID_INVALID;
+		hubp->power_gated = false;
+
+		dc->res_pool->opps[i]->mpc_tree_params.opp_id = dc->res_pool->opps[i]->inst;
+		dc->res_pool->opps[i]->mpc_tree_params.opp_list = NULL;
+		dc->res_pool->opps[i]->mpcc_disconnect_pending[pipe_ctx->plane_res.mpcc_inst] = true;
+		pipe_ctx->stream_res.opp = dc->res_pool->opps[i];
+
+		hws->funcs.plane_atomic_disconnect(dc, context, pipe_ctx);
+
+		if (tg->funcs->is_tg_enabled(tg))
+			tg->funcs->unlock(tg);
+
+		dc->hwss.disable_plane(dc, context, pipe_ctx);
+
+		pipe_ctx->stream_res.tg = NULL;
+		pipe_ctx->plane_res.hubp = NULL;
+
+		if (tg->funcs->is_tg_enabled(tg)) {
+			if (tg->funcs->init_odm)
+				tg->funcs->init_odm(tg);
+		}
+
+		tg->funcs->tg_init(tg);
+	}
+
+	/* Clean up MPC tree */
+	for (i = 0; i < dc->res_pool->pipe_count; i++) {
+		if (tg_enabled[i]) {
+			if (dc->res_pool->opps[i]->mpc_tree_params.opp_list) {
+				if (dc->res_pool->opps[i]->mpc_tree_params.opp_list->mpcc_bot) {
+					int bot_id = dc->res_pool->opps[i]->mpc_tree_params.opp_list->mpcc_bot->mpcc_id;
+
+					if ((bot_id < MAX_MPCC) && (bot_id < MAX_PIPES) && (!tg_enabled[bot_id]))
+						dc->res_pool->opps[i]->mpc_tree_params.opp_list = NULL;
+				}
+			}
+		}
+	}
+
+	/* Power gate DSCs */
+	if (hws->funcs.dsc_pg_control != NULL) {
+		uint32_t num_opps = 0;
+		uint32_t opp_id_src0 = OPP_ID_INVALID;
+		uint32_t opp_id_src1 = OPP_ID_INVALID;
+
+		// Step 1: To find out which OPTC is running & OPTC DSC is ON
+		// We can't use res_pool->res_cap->num_timing_generator to check
+		// Because it records display pipes default setting built in driver,
+		// not display pipes of the current chip.
+		// Some ASICs would be fused display pipes less than the default setting.
+		// In dcnxx_resource_construct function, driver would obatin real information.
+		for (i = 0; i < dc->res_pool->timing_generator_count; i++) {
+			uint32_t optc_dsc_state = 0;
+			struct timing_generator *tg = dc->res_pool->timing_generators[i];
+
+			if (tg->funcs->is_tg_enabled(tg)) {
+				if (tg->funcs->get_dsc_status)
+					tg->funcs->get_dsc_status(tg, &optc_dsc_state);
+				// Only one OPTC with DSC is ON, so if we got one result, we would exit this block.
+				// non-zero value is DSC enabled
+				if (optc_dsc_state != 0) {
+					tg->funcs->get_optc_source(tg, &num_opps, &opp_id_src0, &opp_id_src1);
+					break;
+				}
+			}
+		}
+
+		// Step 2: To power down DSC but skip DSC  of running OPTC
+		for (i = 0; i < dc->res_pool->res_cap->num_dsc; i++) {
+			struct dcn_dsc_state s  = {0};
+
+			dc->res_pool->dscs[i]->funcs->dsc_read_state(dc->res_pool->dscs[i], &s);
+
+			if ((s.dsc_opp_source == opp_id_src0 || s.dsc_opp_source == opp_id_src1) &&
+				s.dsc_clock_en && s.dsc_fw_en)
+				continue;
+
+			hws->funcs.dsc_pg_control(hws, dc->res_pool->dscs[i]->inst, false);
+		}
+	}
+}

linux-7.2.3/drivers/gpu/drm/amd/display/dc/hwss/dcn42b/dcn42b_hwseq.h

@@ -0,0 +1,15 @@
+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright 2026 Advanced Micro Devices, Inc.
+ */
+
+#ifndef __DC_HWSS_DCN42B_H__
+#define __DC_HWSS_DCN42B_H__
+
+#include "dc.h"
+#include "hw_sequencer_private.h"
+
+void dcn42b_init_pipes(struct dc *dc, struct dc_state *context);
+
+#endif /* __DC_HWSS_DCN42B_H__ */

linux-7.2.3/drivers/gpu/drm/amd/display/dc/hwss/dcn42b/dcn42b_init.c

@@ -0,0 +1,20 @@
+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright 2026 Advanced Micro Devices, Inc.
+ */
+
+#include "dcn20/dcn20_hwseq.h"
+#include "dcn42/dcn42_init.h"
+#include "dcn42b_hwseq.h"
+#include "dcn42b_init.h"
+
+void dcn42b_hw_sequencer_init_functions(struct dc *dc)
+{
+	/* Initialize with dcn42 functions first */
+	dcn42_hw_sequencer_init_functions(dc);
+
+	/* Override only init_pipes with dcn42b version */
+	dc->hwseq->funcs.init_pipes = dcn42b_init_pipes;
+
+}

linux-7.2.3/drivers/gpu/drm/amd/display/dc/hwss/dcn42b/dcn42b_init.h

@@ -0,0 +1,14 @@
+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright 2026 Advanced Micro Devices, Inc.
+ */
+
+#ifndef __DC_DCN42B_INIT_H__
+#define __DC_DCN42B_INIT_H__
+
+struct dc;
+
+void dcn42b_hw_sequencer_init_functions(struct dc *dc);
+
+#endif /* __DC_DCN42B_INIT_H__ */