[PATCH 08/12] drm/amd/display: Add DCN36 DMCUB

[Wayne Lin]

DMCU-B (Display Micro-Controller Unit B) is a display microcontroller
used for shared display functionality with BIOS and for advanced
power saving display features.

Add case to support DCN3.6 as well.

V2: adjust copyright license text

Acked-by: Harry Wentland <harry.wentland at amd.com>
Reviewed-by: Martin Leung <martin.leung at amd.com>
Signed-off-by: Taimur Hassan <Syed.Hassan at amd.com>
Signed-off-by: Wayne Lin <Wayne.Lin at amd.com>
---
 drivers/gpu/drm/amd/display/dmub/src/Makefile |  1 +
 .../gpu/drm/amd/display/dmub/src/dmub_dcn36.c | 34 +++++++++++++++++++
 .../gpu/drm/amd/display/dmub/src/dmub_dcn36.h | 13 +++++++
 .../gpu/drm/amd/display/dmub/src/dmub_srv.c   |  4 +++
 4 files changed, 52 insertions(+)
 create mode 100644 drivers/gpu/drm/amd/display/dmub/src/dmub_dcn36.c
 create mode 100644 drivers/gpu/drm/amd/display/dmub/src/dmub_dcn36.h

diff --git a/drivers/gpu/drm/amd/display/dmub/src/Makefile b/drivers/gpu/drm/amd/display/dmub/src/Makefile
index a00b9e992292..468b768c11ae 100644
--- a/drivers/gpu/drm/amd/display/dmub/src/Makefile
+++ b/drivers/gpu/drm/amd/display/dmub/src/Makefile
@@ -26,6 +26,7 @@ DMUB += dmub_dcn31.o dmub_dcn314.o dmub_dcn315.o dmub_dcn316.o
 DMUB += dmub_dcn32.o
 DMUB += dmub_dcn35.o
 DMUB += dmub_dcn351.o
+DMUB += dmub_dcn36.o
 DMUB += dmub_dcn401.o
 
 AMD_DAL_DMUB = $(addprefix $(AMDDALPATH)/dmub/src/,$(DMUB))
diff --git a/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn36.c b/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn36.c
new file mode 100644
index 000000000000..b1ce09d48920
--- /dev/null
+++ b/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn36.c
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: MIT */
+/* Copyright 2025 Advanced Micro Devices, Inc. */
+
+#include "../dmub_srv.h"
+#include "dmub_reg.h"
+#include "dmub_dcn36.h"
+
+#include "dcn/dcn_3_6_0_offset.h"
+#include "dcn/dcn_3_6_0_sh_mask.h"
+
+#define BASE_INNER(seg) ctx->dcn_reg_offsets[seg]
+#define CTX dmub
+#define REGS dmub->regs_dcn35
+#define REG_OFFSET_EXP(reg_name) BASE(reg##reg_name##_BASE_IDX) + reg##reg_name
+
+void dmub_srv_dcn36_regs_init(struct dmub_srv *dmub, struct dc_context *ctx)
+{
+	struct dmub_srv_dcn35_regs *regs = dmub->regs_dcn35;
+#define REG_STRUCT regs
+
+#define DMUB_SR(reg) REG_STRUCT->offset.reg = REG_OFFSET_EXP(reg);
+	DMUB_DCN35_REGS()
+	DMCUB_INTERNAL_REGS()
+#undef DMUB_SR
+
+#define DMUB_SF(reg, field) REG_STRUCT->mask.reg##__##field = FD_MASK(reg, field);
+	DMUB_DCN35_FIELDS()
+#undef DMUB_SF
+
+#define DMUB_SF(reg, field) REG_STRUCT->shift.reg##__##field = FD_SHIFT(reg, field);
+	DMUB_DCN35_FIELDS()
+#undef DMUB_SF
+#undef REG_STRUCT
+}
diff --git a/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn36.h b/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn36.h
new file mode 100644
index 000000000000..57850550f682
--- /dev/null
+++ b/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn36.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: MIT */
+/* Copyright 2025 Advanced Micro Devices, Inc. */
+
+#ifndef _DMUB_DCN36_H_
+#define _DMUB_DCN36_H_
+
+#include "dmub_dcn35.h"
+
+struct dmub_srv;
+
+void dmub_srv_dcn36_regs_init(struct dmub_srv *dmub, struct dc_context *ctx);
+
+#endif /* _DMUB_DCN36_H_ */
diff --git a/drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c b/drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c
index 15ea216e903d..6133d25da301 100644
--- a/drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c
+++ b/drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c
@@ -38,6 +38,7 @@
 #include "dmub_dcn32.h"
 #include "dmub_dcn35.h"
 #include "dmub_dcn351.h"
+#include "dmub_dcn36.h"
 #include "dmub_dcn401.h"
 #include "os_types.h"
 /*
@@ -314,6 +315,7 @@ static bool dmub_srv_hw_setup(struct dmub_srv *dmub, enum dmub_asic asic)
 
 	case DMUB_ASIC_DCN35:
 	case DMUB_ASIC_DCN351:
+	case DMUB_ASIC_DCN36:
 			dmub->regs_dcn35 = &dmub_srv_dcn35_regs;
 			funcs->configure_dmub_in_system_memory = dmub_dcn35_configure_dmub_in_system_memory;
 			funcs->send_inbox0_cmd = dmub_dcn35_send_inbox0_cmd;
@@ -352,6 +354,8 @@ static bool dmub_srv_hw_setup(struct dmub_srv *dmub, enum dmub_asic asic)
 			funcs->init_reg_offsets = dmub_srv_dcn35_regs_init;
 			if (asic == DMUB_ASIC_DCN351)
                                 funcs->init_reg_offsets = dmub_srv_dcn351_regs_init;
+			if (asic == DMUB_ASIC_DCN36)
+				funcs->init_reg_offsets = dmub_srv_dcn36_regs_init;
 
 			funcs->is_hw_powered_up = dmub_dcn35_is_hw_powered_up;
 			funcs->should_detect = dmub_dcn35_should_detect;
-- 
2.37.3