linux-kernel - [PATCH v5 05/12] clk: qcom: gpucc-sm6115: Unregister critical clocks

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Message-Id: <20230717-topic-branch_aon_cleanup-v5-5-99942e6bf1ba@linaro.org>
Date: Wed, 03 Jan 2024 14:36:03 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Bjorn Andersson <andersson@...nel.org>, Andy Gross <agross@...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>
Cc: Marijn Suijten <marijn.suijten@...ainline.org>, 
 linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org, 
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
 Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: [PATCH v5 05/12] clk: qcom: gpucc-sm6115: Unregister critical
 clocks

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@...aro.org>
---
 drivers/clk/qcom/gpucc-sm6115.c | 34 ++++------------------------------
 1 file changed, 4 insertions(+), 30 deletions(-)

diff --git a/drivers/clk/qcom/gpucc-sm6115.c b/drivers/clk/qcom/gpucc-sm6115.c
index fb71c21c9a89..2c2c184747b1 100644
--- a/drivers/clk/qcom/gpucc-sm6115.c
+++ b/drivers/clk/qcom/gpucc-sm6115.c
@@ -234,20 +234,6 @@ static struct clk_rcg2 gpu_cc_gx_gfx3d_clk_src = {
 	},
 };
 
-static struct clk_branch gpu_cc_ahb_clk = {
-	.halt_reg = 0x1078,
-	.halt_check = BRANCH_HALT_DELAY,
-	.clkr = {
-		.enable_reg = 0x1078,
-		.enable_mask = BIT(0),
-		.hw.init = &(struct clk_init_data){
-			.name = "gpu_cc_ahb_clk",
-			.flags = CLK_IS_CRITICAL,
-			.ops = &clk_branch2_ops,
-		},
-	},
-};
-
 static struct clk_branch gpu_cc_crc_ahb_clk = {
 	.halt_reg = 0x107c,
 	.halt_check = BRANCH_HALT_DELAY,
@@ -336,20 +322,6 @@ static struct clk_branch gpu_cc_cxo_clk = {
 	},
 };
 
-static struct clk_branch gpu_cc_gx_cxo_clk = {
-	.halt_reg = 0x1060,
-	.halt_check = BRANCH_HALT_DELAY,
-	.clkr = {
-		.enable_reg = 0x1060,
-		.enable_mask = BIT(0),
-		.hw.init = &(struct clk_init_data){
-			.name = "gpu_cc_gx_cxo_clk",
-			.flags = CLK_IS_CRITICAL,
-			.ops = &clk_branch2_ops,
-		},
-	},
-};
-
 static struct clk_branch gpu_cc_gx_gfx3d_clk = {
 	.halt_reg = 0x1054,
 	.halt_check = BRANCH_HALT_SKIP,
@@ -418,7 +390,6 @@ static struct gdsc gpu_gx_gdsc = {
 };
 
 static struct clk_regmap *gpu_cc_sm6115_clocks[] = {
-	[GPU_CC_AHB_CLK] = &gpu_cc_ahb_clk.clkr,
 	[GPU_CC_CRC_AHB_CLK] = &gpu_cc_crc_ahb_clk.clkr,
 	[GPU_CC_CX_GFX3D_CLK] = &gpu_cc_cx_gfx3d_clk.clkr,
 	[GPU_CC_CX_GMU_CLK] = &gpu_cc_cx_gmu_clk.clkr,
@@ -426,7 +397,6 @@ static struct clk_regmap *gpu_cc_sm6115_clocks[] = {
 	[GPU_CC_CXO_AON_CLK] = &gpu_cc_cxo_aon_clk.clkr,
 	[GPU_CC_CXO_CLK] = &gpu_cc_cxo_clk.clkr,
 	[GPU_CC_GMU_CLK_SRC] = &gpu_cc_gmu_clk_src.clkr,
-	[GPU_CC_GX_CXO_CLK] = &gpu_cc_gx_cxo_clk.clkr,
 	[GPU_CC_GX_GFX3D_CLK] = &gpu_cc_gx_gfx3d_clk.clkr,
 	[GPU_CC_GX_GFX3D_CLK_SRC] = &gpu_cc_gx_gfx3d_clk_src.clkr,
 	[GPU_CC_PLL0] = &gpu_cc_pll0.clkr,
@@ -488,6 +458,10 @@ static int gpu_cc_sm6115_probe(struct platform_device *pdev)
 	qcom_branch_set_force_mem_core(regmap, gpu_cc_gx_gfx3d_clk, true);
 	qcom_branch_set_force_periph_on(regmap, gpu_cc_gx_gfx3d_clk, true);
 
+	/* Keep some clocks always-on */
+	qcom_branch_set_clk_en(regmap, 0x1078); /* GPU_CC_AHB_CLK */
+	qcom_branch_set_clk_en(regmap, 0x1060); /* GPU_CC_GX_CXO_CLK */
+
 	return qcom_cc_really_probe(pdev, &gpu_cc_sm6115_desc, regmap);
 }
 

-- 
2.43.0