linux-kernel - [PATCH 3/9] clk: qcom: gcc-msm8998: Control MMSS and GPUSS GPLL0 outputs properly

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Message-Id: <20230622-topic-8998clk-v1-3-5b7a0d6e98b1@linaro.org>
Date:   Thu, 22 Jun 2023 13:57:43 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Jeffrey Hugo <quic_jhugo@...cinc.com>,
        Taniya Das <tdas@...eaurora.org>
Cc:     Marijn Suijten <marijn.suijten@...ainline.org>,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: [PATCH 3/9] clk: qcom: gcc-msm8998: Control MMSS and GPUSS GPLL0
 outputs properly

Up until now, we've been relying on some non-descript hardware magic
to pinkypromise turn the clocks on for us. While new SoCs shine with
that feature, MSM8998 can not always be fully trusted.

Register the MMSS and GPUSS GPLL0 legs with the CCF to allow for manual
enable voting.

Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 drivers/clk/qcom/gcc-msm8998.c | 58 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)

diff --git a/drivers/clk/qcom/gcc-msm8998.c b/drivers/clk/qcom/gcc-msm8998.c
index be024f8093c5..cccb19cae481 100644
--- a/drivers/clk/qcom/gcc-msm8998.c
+++ b/drivers/clk/qcom/gcc-msm8998.c
@@ -25,6 +25,9 @@
 #include "reset.h"
 #include "gdsc.h"
 
+#define GCC_MMSS_MISC	0x0902C
+#define GCC_GPU_MISC	0x71028
+
 static struct pll_vco fabia_vco[] = {
 	{ 250000000, 2000000000, 0 },
 	{ 125000000, 1000000000, 1 },
@@ -1367,6 +1370,22 @@ static struct clk_branch gcc_boot_rom_ahb_clk = {
 	},
 };
 
+static struct clk_branch gcc_mmss_gpll0_div_clk = {
+	.halt_check = BRANCH_HALT_DELAY,
+	.clkr = {
+		.enable_reg = 0x5200c,
+		.enable_mask = BIT(0),
+		.hw.init = &(struct clk_init_data){
+			.name = "gcc_mmss_gpll0_div_clk",
+			.parent_hws = (const struct clk_hw *[]) {
+				&gpll0_out_main.clkr.hw,
+			},
+			.num_parents = 1,
+			.ops = &clk_branch2_ops,
+		},
+	},
+};
+
 static struct clk_branch gcc_mmss_gpll0_clk = {
 	.halt_check = BRANCH_HALT_DELAY,
 	.clkr = {
@@ -1395,6 +1414,38 @@ static struct clk_branch gcc_mss_gpll0_div_clk_src = {
 	},
 };
 
+static struct clk_branch gcc_gpu_gpll0_div_clk = {
+	.halt_check = BRANCH_HALT_DELAY,
+	.clkr = {
+		.enable_reg = 0x5200c,
+		.enable_mask = BIT(3),
+		.hw.init = &(struct clk_init_data){
+			.name = "gcc_gpu_gpll0_div_clk",
+			.parent_hws = (const struct clk_hw *[]) {
+				&gpll0_out_main.clkr.hw,
+			},
+			.num_parents = 1,
+			.ops = &clk_branch2_ops,
+		},
+	},
+};
+
+static struct clk_branch gcc_gpu_gpll0_clk = {
+	.halt_check = BRANCH_HALT_DELAY,
+	.clkr = {
+		.enable_reg = 0x5200c,
+		.enable_mask = BIT(4),
+		.hw.init = &(struct clk_init_data){
+			.name = "gcc_gpu_gpll0_clk",
+			.parent_hws = (const struct clk_hw *[]) {
+				&gpll0_out_main.clkr.hw,
+			},
+			.num_parents = 1,
+			.ops = &clk_branch2_ops,
+		},
+	},
+};
+
 static struct clk_branch gcc_blsp1_ahb_clk = {
 	.halt_reg = 0x17004,
 	.halt_check = BRANCH_HALT_VOTED,
@@ -3080,6 +3131,9 @@ static struct clk_regmap *gcc_msm8998_clocks[] = {
 	[AGGRE2_SNOC_NORTH_AXI] = &aggre2_snoc_north_axi_clk.clkr,
 	[SSC_XO] = &ssc_xo_clk.clkr,
 	[SSC_CNOC_AHBS_CLK] = &ssc_cnoc_ahbs_clk.clkr,
+	[GCC_MMSS_GPLL0_DIV_CLK] = &gcc_mmss_gpll0_div_clk.clkr,
+	[GCC_GPU_GPLL0_DIV_CLK] = &gcc_gpu_gpll0_div_clk.clkr,
+	[GCC_GPU_GPLL0_CLK] = &gcc_gpu_gpll0_clk.clkr,
 };
 
 static struct gdsc *gcc_msm8998_gdscs[] = {
@@ -3235,6 +3289,10 @@ static int gcc_msm8998_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	/* Disable the GPLL0 active input to MMSS and GPU via MISC registers */
+	regmap_write(regmap, GCC_MMSS_MISC, 0x10003);
+	regmap_write(regmap, GCC_GPU_MISC, 0x10003);
+
 	return qcom_cc_really_probe(pdev, &gcc_msm8998_desc, regmap);
 }
 

-- 
2.41.0