drm/amd/display: update dpp dto phase and modulo.

[Why & How]
Program modulo with ref dpp clk Mhz/10.
Program phase with pipe dpp clk Mhz /10.
DMUB FW could use these value to determine optimization clk
for PSR power saving.
Signed-off-by: Yongqiang Sun <yongqiang.sun@amd.com>
Acked-by: Bindu Ramamurthy <bindu.r@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c

@@ -158,10 +158,8 @@ void rn_update_clocks(struct clk_mgr *clk_mgr_base,
 
 	// workaround: Limit dppclk to 100Mhz to avoid lower eDP panel switch to plus 4K monitor underflow.
 	// Do not adjust dppclk if dppclk is 0 to avoid unexpected result
-	if (!IS_DIAG_DC(dc->ctx->dce_environment)) {
-		if (new_clocks->dppclk_khz < 100000 && new_clocks->dppclk_khz > 0)
-			new_clocks->dppclk_khz = 100000;
-	}
+	if (new_clocks->dppclk_khz < 100000 && new_clocks->dppclk_khz > 0)
+		new_clocks->dppclk_khz = 100000;
 
 	if (should_set_clock(safe_to_lower, new_clocks->dppclk_khz, clk_mgr->base.clks.dppclk_khz)) {
 		if (clk_mgr->base.clks.dppclk_khz > new_clocks->dppclk_khz)

drivers/gpu/drm/amd/display/dc/dcn21/Makefile

@@ -3,7 +3,7 @@
 # Makefile for DCN21.
 
 DCN21 = dcn21_init.o dcn21_hubp.o dcn21_hubbub.o dcn21_resource.o \
-	 dcn21_hwseq.o dcn21_link_encoder.o
+	 dcn21_hwseq.o dcn21_link_encoder.o dcn21_dccg.o
 
 ifdef CONFIG_X86
 CFLAGS_$(AMDDALPATH)/dc/dcn21/dcn21_resource.o := -mhard-float -msse

drivers/gpu/drm/amd/display/dc/dcn21/dcn21_dccg.c

+/*
+ * Copyright 2018 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: AMD
+ *
+ */
+
+#include "reg_helper.h"
+#include "core_types.h"
+#include "dcn20/dcn20_dccg.h"
+#include "dcn21_dccg.h"
+
+#define TO_DCN_DCCG(dccg)\
+	container_of(dccg, struct dcn_dccg, base)
+
+#define REG(reg) \
+	(dccg_dcn->regs->reg)
+
+#undef FN
+#define FN(reg_name, field_name) \
+	dccg_dcn->dccg_shift->field_name, dccg_dcn->dccg_mask->field_name
+
+#define CTX \
+	dccg_dcn->base.ctx
+#define DC_LOGGER \
+	dccg->ctx->logger
+
+void dccg21_update_dpp_dto(struct dccg *dccg, int dpp_inst, int req_dppclk)
+{
+	struct dcn_dccg *dccg_dcn = TO_DCN_DCCG(dccg);
+
+	if (dccg->ref_dppclk) {
+		int ref_dppclk = dccg->ref_dppclk;
+		int modulo = ref_dppclk / 10000;
+
+		if (req_dppclk) {
+			int phase;
+
+			/*
+			 * program DPP DTO phase and modulo as below
+			 * phase = dpp_pipe_clk_mhz / 10
+			 * module = dpp_global_clk_mhz / 10
+			 * dmub FW will read phase value to
+			 * determine minimum dpp clk and notify smu
+			 * to set clks for more power saving in PSR state
+			 */
+			phase = (req_dppclk + 9999) / 10000;
+
+			if (phase > 0xff) {
+				ASSERT(false);
+				phase = 0xff;
+			}
+
+			REG_SET_2(DPPCLK_DTO_PARAM[dpp_inst], 0,
+					DPPCLK0_DTO_PHASE, phase,
+					DPPCLK0_DTO_MODULO, modulo);
+			REG_UPDATE(DPPCLK_DTO_CTRL,
+					DPPCLK_DTO_ENABLE[dpp_inst], 1);
+		} else {
+			/*
+			 *  set phase to 10 if dpp isn't used to
+			 *  prevent hard hang if access dpp register
+			 *  on unused pipe
+			 */
+			REG_SET_2(DPPCLK_DTO_PARAM[dpp_inst], 0,
+				DPPCLK0_DTO_PHASE, 10,
+				DPPCLK0_DTO_MODULO, modulo);
+
+			REG_UPDATE(DPPCLK_DTO_CTRL,
+				DPPCLK_DTO_ENABLE[dpp_inst], 0);
+		}
+	}
+
+	dccg->pipe_dppclk_khz[dpp_inst] = req_dppclk;
+}
+
+
+static const struct dccg_funcs dccg21_funcs = {
+	.update_dpp_dto = dccg21_update_dpp_dto,
+	.get_dccg_ref_freq = dccg2_get_dccg_ref_freq,
+	.dccg_init = dccg2_init
+};
+
+struct dccg *dccg21_create(
+	struct dc_context *ctx,
+	const struct dccg_registers *regs,
+	const struct dccg_shift *dccg_shift,
+	const struct dccg_mask *dccg_mask)
+{
+	struct dcn_dccg *dccg_dcn = kzalloc(sizeof(*dccg_dcn), GFP_KERNEL);
+	struct dccg *base;
+
+	if (dccg_dcn == NULL) {
+		BREAK_TO_DEBUGGER();
+		return NULL;
+	}
+
+	base = &dccg_dcn->base;
+	base->ctx = ctx;
+	base->funcs = &dccg21_funcs;
+
+	dccg_dcn->regs = regs;
+	dccg_dcn->dccg_shift = dccg_shift;
+	dccg_dcn->dccg_mask = dccg_mask;
+
+	return &dccg_dcn->base;
+}

drivers/gpu/drm/amd/display/dc/dcn21/dcn21_dccg.h

+/*
+ * Copyright 2018 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: AMD
+ *
+ */
+
+#ifndef __DCN21_DCCG_H__
+#define __DCN21_DCCG_H__
+
+struct dccg *dccg21_create(
+	struct dc_context *ctx,
+	const struct dccg_registers *regs,
+	const struct dccg_shift *dccg_shift,
+	const struct dccg_mask *dccg_mask);
+
+
+#endif /* __DCN21_DCCG_H__ */

drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c

@@ -58,6 +58,7 @@
 #include "dce110/dce110_resource.h"
 #include "dml/display_mode_vba.h"
 #include "dcn20/dcn20_dccg.h"
+#include "dcn21/dcn21_dccg.h"
 #include "dcn21_hubbub.h"
 #include "dcn10/dcn10_resource.h"
 #include "dce110/dce110_resource.h"
@@ -2046,7 +2047,7 @@ static bool dcn21_resource_construct(
 		}
 	}
 
-	pool->base.dccg = dccg2_create(ctx, &dccg_regs, &dccg_shift, &dccg_mask);
+	pool->base.dccg = dccg21_create(ctx, &dccg_regs, &dccg_shift, &dccg_mask);
 	if (pool->base.dccg == NULL) {
 		dm_error("DC: failed to create dccg!\n");
 		BREAK_TO_DEBUGGER();