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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Ilya Bakoulin <Ilya.Bakoulin@amd.com>,
        Sung Lee <Sung.Lee@amd.com>, Stylon Wang <stylon.wang@amd.com>,
        Daniel Wheeler <daniel.wheeler@amd.com>,
        Alex Deucher <alexander.deucher@amd.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.13 083/266] drm/amd/display: Revert "Fix clock table filling logic"
Date:   Thu, 15 Jul 2021 20:37:18 +0200
Message-Id: <20210715182628.888176227@linuxfoundation.org>
In-Reply-To: <20210715182613.933608881@linuxfoundation.org>
References: <20210715182613.933608881@linuxfoundation.org>
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From: Ilya Bakoulin <Ilya.Bakoulin@amd.com>

[ Upstream commit ae88357c7966ec2a52cb1e70fd42f74a40c9dfcb ]

[Why]
This change was found to break some high-refresh modes. Reverting
to unblock mainline.

Signed-off-by: Ilya Bakoulin <Ilya.Bakoulin@amd.com>
Reviewed-by: Sung Lee <Sung.Lee@amd.com>
Acked-by: Stylon Wang <stylon.wang@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 .../amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c | 78 +++++++------------
 .../drm/amd/display/dc/dcn21/dcn21_resource.c | 33 +++-----
 2 files changed, 39 insertions(+), 72 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c
index 1f56ceab5922..75ba86f951f8 100644
--- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c
+++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c
@@ -835,66 +835,47 @@ static struct wm_table lpddr4_wm_table_rn = {
 	}
 };
 
-static unsigned int find_max_fclk_for_voltage(struct dpm_clocks *clock_table,
-		unsigned int voltage)
+static unsigned int find_socclk_for_voltage(struct dpm_clocks *clock_table, unsigned int voltage)
 {
 	int i;
-	uint32_t max_clk = 0;
 
-	for (i = 0; i < PP_SMU_NUM_FCLK_DPM_LEVELS; i++) {
-		if (clock_table->FClocks[i].Vol <= voltage) {
-			max_clk = clock_table->FClocks[i].Freq > max_clk ?
-				clock_table->FClocks[i].Freq : max_clk;
-		}
-	}
-
-	return max_clk;
-}
-
-static unsigned int find_max_memclk_for_voltage(struct dpm_clocks *clock_table,
-		unsigned int voltage)
-{
-	int i;
-	uint32_t max_clk = 0;
-
-	for (i = 0; i < PP_SMU_NUM_MEMCLK_DPM_LEVELS; i++) {
-		if (clock_table->MemClocks[i].Vol <= voltage) {
-			max_clk = clock_table->MemClocks[i].Freq > max_clk ?
-				clock_table->MemClocks[i].Freq : max_clk;
-		}
+	for (i = 0; i < PP_SMU_NUM_SOCCLK_DPM_LEVELS; i++) {
+		if (clock_table->SocClocks[i].Vol == voltage)
+			return clock_table->SocClocks[i].Freq;
 	}
 
-	return max_clk;
+	ASSERT(0);
+	return 0;
 }
 
-static unsigned int find_max_socclk_for_voltage(struct dpm_clocks *clock_table,
-		unsigned int voltage)
+static unsigned int find_dcfclk_for_voltage(struct dpm_clocks *clock_table, unsigned int voltage)
 {
 	int i;
-	uint32_t max_clk = 0;
 
-	for (i = 0; i < PP_SMU_NUM_SOCCLK_DPM_LEVELS; i++) {
-		if (clock_table->SocClocks[i].Vol <= voltage) {
-			max_clk = clock_table->SocClocks[i].Freq > max_clk ?
-				clock_table->SocClocks[i].Freq : max_clk;
-		}
+	for (i = 0; i < PP_SMU_NUM_DCFCLK_DPM_LEVELS; i++) {
+		if (clock_table->DcfClocks[i].Vol == voltage)
+			return clock_table->DcfClocks[i].Freq;
 	}
 
-	return max_clk;
+	ASSERT(0);
+	return 0;
 }
 
 static void rn_clk_mgr_helper_populate_bw_params(struct clk_bw_params *bw_params, struct dpm_clocks *clock_table, struct integrated_info *bios_info)
 {
 	int i, j = 0;
-	unsigned int volt;
 
 	j = -1;
 
-	/* Find max DPM */
-	for (i = 0; i < PP_SMU_NUM_DCFCLK_DPM_LEVELS; ++i) {
-		if (clock_table->DcfClocks[i].Freq != 0 &&
-				clock_table->DcfClocks[i].Vol != 0)
+	ASSERT(PP_SMU_NUM_FCLK_DPM_LEVELS <= MAX_NUM_DPM_LVL);
+
+	/* Find lowest DPM, FCLK is filled in reverse order*/
+
+	for (i = PP_SMU_NUM_FCLK_DPM_LEVELS - 1; i >= 0; i--) {
+		if (clock_table->FClocks[i].Freq != 0 && clock_table->FClocks[i].Vol != 0) {
 			j = i;
+			break;
+		}
 	}
 
 	if (j == -1) {
@@ -905,18 +886,13 @@ static void rn_clk_mgr_helper_populate_bw_params(struct clk_bw_params *bw_params
 
 	bw_params->clk_table.num_entries = j + 1;
 
-	for (i = 0; i < bw_params->clk_table.num_entries; i++) {
-		volt = clock_table->DcfClocks[i].Vol;
-
-		bw_params->clk_table.entries[i].voltage = volt;
-		bw_params->clk_table.entries[i].dcfclk_mhz =
-			clock_table->DcfClocks[i].Freq;
-		bw_params->clk_table.entries[i].fclk_mhz =
-			find_max_fclk_for_voltage(clock_table, volt);
-		bw_params->clk_table.entries[i].memclk_mhz =
-			find_max_memclk_for_voltage(clock_table, volt);
-		bw_params->clk_table.entries[i].socclk_mhz =
-			find_max_socclk_for_voltage(clock_table, volt);
+	for (i = 0; i < bw_params->clk_table.num_entries; i++, j--) {
+		bw_params->clk_table.entries[i].fclk_mhz = clock_table->FClocks[j].Freq;
+		bw_params->clk_table.entries[i].memclk_mhz = clock_table->MemClocks[j].Freq;
+		bw_params->clk_table.entries[i].voltage = clock_table->FClocks[j].Vol;
+		bw_params->clk_table.entries[i].dcfclk_mhz = find_dcfclk_for_voltage(clock_table, clock_table->FClocks[j].Vol);
+		bw_params->clk_table.entries[i].socclk_mhz = find_socclk_for_voltage(clock_table,
+									bw_params->clk_table.entries[i].voltage);
 	}
 
 	bw_params->vram_type = bios_info->memory_type;
diff --git a/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c b/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
index 38a2aa87f5f5..8e3f1d0b4cc3 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
@@ -1575,12 +1575,10 @@ static struct _vcs_dpi_voltage_scaling_st construct_low_pstate_lvl(struct clk_li
 	low_pstate_lvl.phyclk_d18_mhz = dcn2_1_soc.clock_limits[high_voltage_lvl].phyclk_d18_mhz;
 	low_pstate_lvl.phyclk_mhz = dcn2_1_soc.clock_limits[high_voltage_lvl].phyclk_mhz;
 
-	if (clk_table->num_entries < MAX_NUM_DPM_LVL) {
-		for (i = clk_table->num_entries; i > 1; i--)
-			clk_table->entries[i] = clk_table->entries[i-1];
-		clk_table->entries[1] = clk_table->entries[0];
-		clk_table->num_entries++;
-	}
+	for (i = clk_table->num_entries; i > 1; i--)
+		clk_table->entries[i] = clk_table->entries[i-1];
+	clk_table->entries[1] = clk_table->entries[0];
+	clk_table->num_entries++;
 
 	return low_pstate_lvl;
 }
@@ -1612,6 +1610,10 @@ static void update_bw_bounding_box(struct dc *dc, struct clk_bw_params *bw_param
 			}
 		}
 
+		/* clk_table[1] is reserved for min DF PState.  skip here to fill in later. */
+		if (i == 1)
+			k++;
+
 		clock_limits[k].state = k;
 		clock_limits[k].dcfclk_mhz = clk_table->entries[i].dcfclk_mhz;
 		clock_limits[k].fabricclk_mhz = clk_table->entries[i].fclk_mhz;
@@ -1628,25 +1630,14 @@ static void update_bw_bounding_box(struct dc *dc, struct clk_bw_params *bw_param
 
 		k++;
 	}
-
-	if (clk_table->num_entries >= MAX_NUM_DPM_LVL) {
-		for (i = 0; i < clk_table->num_entries + 1; i++)
-			dcn2_1_soc.clock_limits[i] = clock_limits[i];
-	} else {
-		dcn2_1_soc.clock_limits[0] = clock_limits[0];
-		for (i = 2; i < clk_table->num_entries + 1; i++) {
-			dcn2_1_soc.clock_limits[i] = clock_limits[i - 1];
-			dcn2_1_soc.clock_limits[i].state = i;
-		}
-	}
-
+	for (i = 0; i < clk_table->num_entries + 1; i++)
+		dcn2_1_soc.clock_limits[i] = clock_limits[i];
 	if (clk_table->num_entries) {
+		dcn2_1_soc.num_states = clk_table->num_entries + 1;
 		/* fill in min DF PState */
 		dcn2_1_soc.clock_limits[1] = construct_low_pstate_lvl(clk_table, closest_clk_lvl);
-		dcn2_1_soc.num_states = clk_table->num_entries;
 		/* duplicate last level */
-		dcn2_1_soc.clock_limits[dcn2_1_soc.num_states] =
-			dcn2_1_soc.clock_limits[dcn2_1_soc.num_states - 1];
+		dcn2_1_soc.clock_limits[dcn2_1_soc.num_states] = dcn2_1_soc.clock_limits[dcn2_1_soc.num_states - 1];
 		dcn2_1_soc.clock_limits[dcn2_1_soc.num_states].state = dcn2_1_soc.num_states;
 	}
 
-- 
2.30.2