1 files changed, 159 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dccg.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dccg.c
new file mode 100644
index 000000000000..51a3dfe97f0e
--- /dev/null
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dccg.c
@@ -0,0 +1,159 @@
+/*
+ * 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 <linux/slab.h>
+
+#include "reg_helper.h"
+#include "core_types.h"
+#include "dcn20_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 dccg2_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 && req_dppclk) {
+		int ref_dppclk = dccg->ref_dppclk;
+
+		ASSERT(req_dppclk <= ref_dppclk);
+		/* need to clamp to 8 bits */
+		if (ref_dppclk > 0xff) {
+			int divider = (ref_dppclk + 0xfe) / 0xff;
+
+			ref_dppclk /= divider;
+			req_dppclk = (req_dppclk + divider - 1) / divider;
+			if (req_dppclk > ref_dppclk)
+				req_dppclk = ref_dppclk;
+		}
+		REG_SET_2(DPPCLK_DTO_PARAM[dpp_inst], 0,
+				DPPCLK0_DTO_PHASE, req_dppclk,
+				DPPCLK0_DTO_MODULO, ref_dppclk);
+		REG_UPDATE(DPPCLK_DTO_CTRL,
+				DPPCLK_DTO_ENABLE[dpp_inst], 1);
+	} else {
+		REG_UPDATE(DPPCLK_DTO_CTRL,
+				DPPCLK_DTO_ENABLE[dpp_inst], 0);
+	}
+}
+
+void dccg2_get_dccg_ref_freq(struct dccg *dccg,
+		unsigned int xtalin_freq_inKhz,
+		unsigned int *dccg_ref_freq_inKhz)
+{
+	struct dcn_dccg *dccg_dcn = TO_DCN_DCCG(dccg);
+	uint32_t clk_en = 0;
+	uint32_t clk_sel = 0;
+
+	REG_GET_2(REFCLK_CNTL, REFCLK_CLOCK_EN, &clk_en, REFCLK_SRC_SEL, &clk_sel);
+
+	if (clk_en != 0) {
+		// DCN20 has never been validated for non-xtalin as reference
+		// frequency.  There's actually no way for DC to determine what
+		// frequency a non-xtalin source is.
+		ASSERT_CRITICAL(false);
+	}
+
+	*dccg_ref_freq_inKhz = xtalin_freq_inKhz;
+
+	return;
+}
+
+void dccg2_init(struct dccg *dccg)
+{
+	struct dcn_dccg *dccg_dcn = TO_DCN_DCCG(dccg);
+
+	// Fallthrough intentional to program all available dpp_dto's
+	switch (dccg_dcn->base.ctx->dc->res_pool->pipe_count) {
+	case 6:
+		REG_UPDATE(DPPCLK_DTO_CTRL, DPPCLK_DTO_DB_EN[5], 1);
+	case 5:
+		REG_UPDATE(DPPCLK_DTO_CTRL, DPPCLK_DTO_DB_EN[4], 1);
+	case 4:
+		REG_UPDATE(DPPCLK_DTO_CTRL, DPPCLK_DTO_DB_EN[3], 1);
+	case 3:
+		REG_UPDATE(DPPCLK_DTO_CTRL, DPPCLK_DTO_DB_EN[2], 1);
+	case 2:
+		REG_UPDATE(DPPCLK_DTO_CTRL, DPPCLK_DTO_DB_EN[1], 1);
+	case 1:
+		REG_UPDATE(DPPCLK_DTO_CTRL, DPPCLK_DTO_DB_EN[0], 1);
+		break;
+	default:
+		ASSERT(false);
+		break;
+	}
+}
+
+static const struct dccg_funcs dccg2_funcs = {
+	.update_dpp_dto = dccg2_update_dpp_dto,
+	.get_dccg_ref_freq = dccg2_get_dccg_ref_freq,
+	.dccg_init = dccg2_init
+};
+
+struct dccg *dccg2_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 = &dccg2_funcs;
+
+	dccg_dcn->regs = regs;
+	dccg_dcn->dccg_shift = dccg_shift;
+	dccg_dcn->dccg_mask = dccg_mask;
+
+	return &dccg_dcn->base;
+}
+
+void dcn_dccg_destroy(struct dccg **dccg)
+{
+	struct dcn_dccg *dccg_dcn = TO_DCN_DCCG(*dccg);
+
+	kfree(dccg_dcn);
+	*dccg = NULL;
+}