Received-SPF: pass (google.com: domain of linux-kernel+bounces-25306-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45d1:ec00::1 as permitted sender) client-ip=2604:1380:45d1:ec00::1;
From: Konrad Dybcio <konrad.dybcio@linaro.org>
Date: Sat, 13 Jan 2024 15:50:57 +0100
Subject: [PATCH v6 08/12] clk: qcom: gcc-qcm2290: Unregister critical
 clocks
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 7bit
Message-Id: <20230717-topic-branch_aon_cleanup-v6-8-46d136a4e8d0@linaro.org>
References: <20230717-topic-branch_aon_cleanup-v6-0-46d136a4e8d0@linaro.org>
In-Reply-To: <20230717-topic-branch_aon_cleanup-v6-0-46d136a4e8d0@linaro.org>
To: Bjorn Andersson <andersson@kernel.org>, Andy Gross <agross@kernel.org>, 
 Michael Turquette <mturquette@baylibre.com>, 
 Stephen Boyd <sboyd@kernel.org>, Rob Herring <robh+dt@kernel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>, 
 Conor Dooley <conor+dt@kernel.org>
Cc: Marijn Suijten <marijn.suijten@somainline.org>, 
 linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org, 
 linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, 
 Konrad Dybcio <konrad.dybcio@linaro.org>

Some clocks need to be always-on, but we don't really do anything
with them, other than calling enable() once and telling Linux they're
enabled.

Unregister them to save a couple of bytes and, perhaps more
importantly, allow for runtime suspend of the clock controller device,
as CLK_IS_CRITICAL prevents the latter.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
---
 drivers/clk/qcom/gcc-qcm2290.c | 106 ++++-------------------------------------
 1 file changed, 8 insertions(+), 98 deletions(-)

diff --git a/drivers/clk/qcom/gcc-qcm2290.c b/drivers/clk/qcom/gcc-qcm2290.c
index 48995e50c6bd..fd20408d8205 100644
--- a/drivers/clk/qcom/gcc-qcm2290.c
+++ b/drivers/clk/qcom/gcc-qcm2290.c
@@ -1397,36 +1397,6 @@ static struct clk_branch gcc_cam_throttle_rt_clk = {
 	},
 };
 
-static struct clk_branch gcc_camera_ahb_clk = {
-	.halt_reg = 0x17008,
-	.halt_check = BRANCH_HALT_DELAY,
-	.hwcg_reg = 0x17008,
-	.hwcg_bit = 1,
-	.clkr = {
-		.enable_reg = 0x17008,
-		.enable_mask = BIT(0),
-		.hw.init = &(struct clk_init_data){
-			.name = "gcc_camera_ahb_clk",
-			.flags = CLK_IS_CRITICAL,
-			.ops = &clk_branch2_ops,
-		},
-	},
-};
-
-static struct clk_branch gcc_camera_xo_clk = {
-	.halt_reg = 0x17028,
-	.halt_check = BRANCH_HALT,
-	.clkr = {
-		.enable_reg = 0x17028,
-		.enable_mask = BIT(0),
-		.hw.init = &(struct clk_init_data){
-			.name = "gcc_camera_xo_clk",
-			.flags = CLK_IS_CRITICAL,
-			.ops = &clk_branch2_ops,
-		},
-	},
-};
-
 static struct clk_branch gcc_camss_axi_clk = {
 	.halt_reg = 0x58044,
 	.halt_check = BRANCH_HALT,
@@ -1825,22 +1795,6 @@ static struct clk_branch gcc_cfg_noc_usb3_prim_axi_clk = {
 	},
 };
 
-static struct clk_branch gcc_disp_ahb_clk = {
-	.halt_reg = 0x1700c,
-	.halt_check = BRANCH_HALT,
-	.hwcg_reg = 0x1700c,
-	.hwcg_bit = 1,
-	.clkr = {
-		.enable_reg = 0x1700c,
-		.enable_mask = BIT(0),
-		.hw.init = &(struct clk_init_data){
-			.name = "gcc_disp_ahb_clk",
-			.flags = CLK_IS_CRITICAL,
-			.ops = &clk_branch2_ops,
-		},
-	},
-};
-
 static struct clk_regmap_div gcc_disp_gpll0_clk_src = {
 	.reg = 0x17058,
 	.shift = 0,
@@ -1899,20 +1853,6 @@ static struct clk_branch gcc_disp_throttle_core_clk = {
 	},
 };
 
-static struct clk_branch gcc_disp_xo_clk = {
-	.halt_reg = 0x1702c,
-	.halt_check = BRANCH_HALT,
-	.clkr = {
-		.enable_reg = 0x1702c,
-		.enable_mask = BIT(0),
-		.hw.init = &(struct clk_init_data){
-			.name = "gcc_disp_xo_clk",
-			.flags = CLK_IS_CRITICAL,
-			.ops = &clk_branch2_ops,
-		},
-	},
-};
-
 static struct clk_branch gcc_gp1_clk = {
 	.halt_reg = 0x4d000,
 	.halt_check = BRANCH_HALT,
@@ -1964,22 +1904,6 @@ static struct clk_branch gcc_gp3_clk = {
 	},
 };
 
-static struct clk_branch gcc_gpu_cfg_ahb_clk = {
-	.halt_reg = 0x36004,
-	.halt_check = BRANCH_HALT,
-	.hwcg_reg = 0x36004,
-	.hwcg_bit = 1,
-	.clkr = {
-		.enable_reg = 0x36004,
-		.enable_mask = BIT(0),
-		.hw.init = &(struct clk_init_data){
-			.name = "gcc_gpu_cfg_ahb_clk",
-			.flags = CLK_IS_CRITICAL,
-			.ops = &clk_branch2_ops,
-		},
-	},
-};
-
 static struct clk_branch gcc_gpu_gpll0_clk_src = {
 	.halt_check = BRANCH_HALT_DELAY,
 	.clkr = {
@@ -2439,22 +2363,6 @@ static struct clk_branch gcc_sdcc2_apps_clk = {
 	},
 };
 
-static struct clk_branch gcc_sys_noc_cpuss_ahb_clk = {
-	.halt_reg = 0x2b06c,
-	.halt_check = BRANCH_HALT_VOTED,
-	.hwcg_reg = 0x2b06c,
-	.hwcg_bit = 1,
-	.clkr = {
-		.enable_reg = 0x79004,
-		.enable_mask = BIT(0),
-		.hw.init = &(struct clk_init_data){
-			.name = "gcc_sys_noc_cpuss_ahb_clk",
-			.flags = CLK_IS_CRITICAL,
-			.ops = &clk_branch2_ops,
-		},
-	},
-};
-
 static struct clk_branch gcc_sys_noc_usb3_prim_axi_clk = {
 	.halt_reg = 0x1a080,
 	.halt_check = BRANCH_HALT,
@@ -2774,8 +2682,6 @@ static struct clk_regmap *gcc_qcm2290_clocks[] = {
 	[GCC_BOOT_ROM_AHB_CLK] = &gcc_boot_rom_ahb_clk.clkr,
 	[GCC_CAM_THROTTLE_NRT_CLK] = &gcc_cam_throttle_nrt_clk.clkr,
 	[GCC_CAM_THROTTLE_RT_CLK] = &gcc_cam_throttle_rt_clk.clkr,
-	[GCC_CAMERA_AHB_CLK] = &gcc_camera_ahb_clk.clkr,
-	[GCC_CAMERA_XO_CLK] = &gcc_camera_xo_clk.clkr,
 	[GCC_CAMSS_AXI_CLK] = &gcc_camss_axi_clk.clkr,
 	[GCC_CAMSS_AXI_CLK_SRC] = &gcc_camss_axi_clk_src.clkr,
 	[GCC_CAMSS_CAMNOC_ATB_CLK] = &gcc_camss_camnoc_atb_clk.clkr,
@@ -2816,19 +2722,16 @@ static struct clk_regmap *gcc_qcm2290_clocks[] = {
 	[GCC_CAMSS_TOP_AHB_CLK] = &gcc_camss_top_ahb_clk.clkr,
 	[GCC_CAMSS_TOP_AHB_CLK_SRC] = &gcc_camss_top_ahb_clk_src.clkr,
 	[GCC_CFG_NOC_USB3_PRIM_AXI_CLK] = &gcc_cfg_noc_usb3_prim_axi_clk.clkr,
-	[GCC_DISP_AHB_CLK] = &gcc_disp_ahb_clk.clkr,
 	[GCC_DISP_GPLL0_CLK_SRC] = &gcc_disp_gpll0_clk_src.clkr,
 	[GCC_DISP_GPLL0_DIV_CLK_SRC] = &gcc_disp_gpll0_div_clk_src.clkr,
 	[GCC_DISP_HF_AXI_CLK] = &gcc_disp_hf_axi_clk.clkr,
 	[GCC_DISP_THROTTLE_CORE_CLK] = &gcc_disp_throttle_core_clk.clkr,
-	[GCC_DISP_XO_CLK] = &gcc_disp_xo_clk.clkr,
 	[GCC_GP1_CLK] = &gcc_gp1_clk.clkr,
 	[GCC_GP1_CLK_SRC] = &gcc_gp1_clk_src.clkr,
 	[GCC_GP2_CLK] = &gcc_gp2_clk.clkr,
 	[GCC_GP2_CLK_SRC] = &gcc_gp2_clk_src.clkr,
 	[GCC_GP3_CLK] = &gcc_gp3_clk.clkr,
 	[GCC_GP3_CLK_SRC] = &gcc_gp3_clk_src.clkr,
-	[GCC_GPU_CFG_AHB_CLK] = &gcc_gpu_cfg_ahb_clk.clkr,
 	[GCC_GPU_GPLL0_CLK_SRC] = &gcc_gpu_gpll0_clk_src.clkr,
 	[GCC_GPU_GPLL0_DIV_CLK_SRC] = &gcc_gpu_gpll0_div_clk_src.clkr,
 	[GCC_GPU_IREF_CLK] = &gcc_gpu_iref_clk.clkr,
@@ -2869,7 +2772,6 @@ static struct clk_regmap *gcc_qcm2290_clocks[] = {
 	[GCC_SDCC2_AHB_CLK] = &gcc_sdcc2_ahb_clk.clkr,
 	[GCC_SDCC2_APPS_CLK] = &gcc_sdcc2_apps_clk.clkr,
 	[GCC_SDCC2_APPS_CLK_SRC] = &gcc_sdcc2_apps_clk_src.clkr,
-	[GCC_SYS_NOC_CPUSS_AHB_CLK] = &gcc_sys_noc_cpuss_ahb_clk.clkr,
 	[GCC_SYS_NOC_USB3_PRIM_AXI_CLK] = &gcc_sys_noc_usb3_prim_axi_clk.clkr,
 	[GCC_USB30_PRIM_MASTER_CLK] = &gcc_usb30_prim_master_clk.clkr,
 	[GCC_USB30_PRIM_MASTER_CLK_SRC] = &gcc_usb30_prim_master_clk_src.clkr,
@@ -2994,6 +2896,14 @@ static int gcc_qcm2290_probe(struct platform_device *pdev)
 	clk_alpha_pll_configure(&gpll8, regmap, &gpll8_config);
 	clk_alpha_pll_configure(&gpll9, regmap, &gpll9_config);
 
+	/* Keep some clocks always-on */
+	qcom_branch_set_clk_en(regmap, 0x17008); /* GCC_CAMERA_AHB_CLK */
+	qcom_branch_set_clk_en(regmap, 0x1700c); /* GCC_DISP_AHB_CLK */
+	qcom_branch_set_clk_en(regmap, 0x17028); /* GCC_CAMERA_XO_CLK */
+	qcom_branch_set_clk_en(regmap, 0x1702c); /* GCC_DISP_XO_CLK */
+	qcom_branch_set_clk_en(regmap, 0x2b06c); /* GCC_SYS_NOC_CPUSS_AHB_CLK */
+	qcom_branch_set_clk_en(regmap, 0x36004); /* GCC_GPU_CFG_AHB_CLK */
+
 	return qcom_cc_really_probe(pdev, &gcc_qcm2290_desc, regmap);
 }
 

-- 
2.43.0