linux-kernel - [PATCH v2 08/11] clk: qcom: mmcc-msm8998: Add hardware clockgating registers to some clks

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Date:   Thu, 14 Jan 2021 23:10:56 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>
To:     linux-arm-msm@...r.kernel.org
Cc:     konrad.dybcio@...ainline.org, marijn.suijten@...ainline.org,
        martin.botka@...ainline.org, phone-devel@...r.kernel.org,
        linux-kernel@...r.kernel.org, agross@...nel.org,
        bjorn.andersson@...aro.org, mturquette@...libre.com,
        sboyd@...nel.org, robh+dt@...nel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>
Subject: [PATCH v2 08/11] clk: qcom: mmcc-msm8998: Add hardware clockgating registers to some clks

Hardware clock gating is supported on some of the clocks declared in
there: ignoring that it does exist may lead to unstabilities on some
firmwares.
Add the HWCG registers where applicable to stop potential crashes.

This was verified on a smartphone shipped with a recent MSM8998
firmware, which will experience random crashes without this change.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>
---
 drivers/clk/qcom/mmcc-msm8998.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/clk/qcom/mmcc-msm8998.c b/drivers/clk/qcom/mmcc-msm8998.c
index 475e00a5fdf4..f9510a248a36 100644
--- a/drivers/clk/qcom/mmcc-msm8998.c
+++ b/drivers/clk/qcom/mmcc-msm8998.c
@@ -1211,6 +1211,8 @@ static struct clk_rcg2 vfe1_clk_src = {
 
 static struct clk_branch misc_ahb_clk = {
 	.halt_reg = 0x328,
+	.hwcg_reg = 0x328,
+	.hwcg_bit = 1,
 	.clkr = {
 		.enable_reg = 0x328,
 		.enable_mask = BIT(0),
@@ -1241,6 +1243,8 @@ static struct clk_branch video_core_clk = {
 
 static struct clk_branch video_ahb_clk = {
 	.halt_reg = 0x1030,
+	.hwcg_reg = 0x1030,
+	.hwcg_bit = 1,
 	.clkr = {
 		.enable_reg = 0x1030,
 		.enable_mask = BIT(0),
@@ -1315,6 +1319,8 @@ static struct clk_branch video_subcore1_clk = {
 
 static struct clk_branch mdss_ahb_clk = {
 	.halt_reg = 0x2308,
+	.hwcg_reg = 0x2308,
+	.hwcg_bit = 1,
 	.clkr = {
 		.enable_reg = 0x2308,
 		.enable_mask = BIT(0),
@@ -2496,6 +2502,8 @@ static struct clk_branch mnoc_ahb_clk = {
 
 static struct clk_branch bimc_smmu_ahb_clk = {
 	.halt_reg = 0xe004,
+	.hwcg_reg = 0xe004,
+	.hwcg_bit = 1,
 	.clkr = {
 		.enable_reg = 0xe004,
 		.enable_mask = BIT(0),
@@ -2511,6 +2519,8 @@ static struct clk_branch bimc_smmu_ahb_clk = {
 
 static struct clk_branch bimc_smmu_axi_clk = {
 	.halt_reg = 0xe008,
+	.hwcg_reg = 0xe008,
+	.hwcg_bit = 1,
 	.clkr = {
 		.enable_reg = 0xe008,
 		.enable_mask = BIT(0),
-- 
2.29.2