linux-kernel - [PATCH v6 04/12] clk: qcom: gpucc-sm6375: Unregister critical clocks

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Sat, 13 Jan 2024 15:50:53 +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>, 
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Subject: [PATCH v6 04/12] clk: qcom: gpucc-sm6375: 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.

Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 drivers/clk/qcom/gpucc-sm6375.c | 34 ++++------------------------------
 1 file changed, 4 insertions(+), 30 deletions(-)

diff --git a/drivers/clk/qcom/gpucc-sm6375.c b/drivers/clk/qcom/gpucc-sm6375.c
index da24276a018e..07ebe5e139d5 100644
--- a/drivers/clk/qcom/gpucc-sm6375.c
+++ b/drivers/clk/qcom/gpucc-sm6375.c
@@ -183,20 +183,6 @@ static struct clk_rcg2 gpucc_gx_gfx3d_clk_src = {
 	},
 };
 
-static struct clk_branch gpucc_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 = "gpucc_ahb_clk",
-			.flags = CLK_IS_CRITICAL,
-			.ops = &clk_branch2_ops,
-		},
-	},
-};
-
 static struct clk_branch gpucc_cx_gfx3d_clk = {
 	.halt_reg = 0x10a4,
 	.halt_check = BRANCH_HALT_DELAY,
@@ -294,20 +280,6 @@ static struct clk_branch gpucc_cxo_clk = {
 	},
 };
 
-static struct clk_branch gpucc_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 = "gpucc_gx_cxo_clk",
-			.flags = CLK_IS_CRITICAL,
-			.ops = &clk_branch2_ops,
-		},
-	},
-};
-
 static struct clk_branch gpucc_gx_gfx3d_clk = {
 	.halt_reg = 0x1054,
 	.halt_check = BRANCH_HALT_DELAY,
@@ -381,7 +353,6 @@ static struct gdsc gpu_gx_gdsc = {
 };
 
 static struct clk_regmap *gpucc_sm6375_clocks[] = {
-	[GPU_CC_AHB_CLK] = &gpucc_ahb_clk.clkr,
 	[GPU_CC_CX_GFX3D_CLK] = &gpucc_cx_gfx3d_clk.clkr,
 	[GPU_CC_CX_GFX3D_SLV_CLK] = &gpucc_cx_gfx3d_slv_clk.clkr,
 	[GPU_CC_CX_GMU_CLK] = &gpucc_cx_gmu_clk.clkr,
@@ -389,7 +360,6 @@ static struct clk_regmap *gpucc_sm6375_clocks[] = {
 	[GPU_CC_CXO_AON_CLK] = &gpucc_cxo_aon_clk.clkr,
 	[GPU_CC_CXO_CLK] = &gpucc_cxo_clk.clkr,
 	[GPU_CC_GMU_CLK_SRC] = &gpucc_gmu_clk_src.clkr,
-	[GPU_CC_GX_CXO_CLK] = &gpucc_gx_cxo_clk.clkr,
 	[GPU_CC_GX_GFX3D_CLK] = &gpucc_gx_gfx3d_clk.clkr,
 	[GPU_CC_GX_GFX3D_CLK_SRC] = &gpucc_gx_gfx3d_clk_src.clkr,
 	[GPU_CC_GX_GMU_CLK] = &gpucc_gx_gmu_clk.clkr,
@@ -455,6 +425,10 @@ static int gpucc_sm6375_probe(struct platform_device *pdev)
 	clk_lucid_pll_configure(&gpucc_pll0, regmap, &gpucc_pll0_config);
 	clk_lucid_pll_configure(&gpucc_pll1, regmap, &gpucc_pll1_config);
 
+	/* Keep some clocks always-on */
+	qcom_branch_set_clk_en(regmap, 0x1078); /* GPUCC_AHB_CLK */
+	qcom_branch_set_clk_en(regmap, 0x1060); /* GPUCC_GX_CXO_CLK */
+
 	ret = qcom_cc_really_probe(pdev, &gpucc_sm6375_desc, regmap);
 	pm_runtime_put(&pdev->dev);
 

-- 
2.43.0