linux-kernel - [PATCH 1/4] clk: qcom: gcc-sdm660: Mark MMSS NoC CFG AHB clock as critical

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Message-Id: <20200926130225.13733-2-kholk11@gmail.com>
Date:   Sat, 26 Sep 2020 15:02:22 +0200
From:   kholk11@...il.com
To:     agross@...nel.org
Cc:     bjorn.andersson@...aro.org, sboyd@...nel.org, kholk11@...il.com,
        marijns95@...il.com, konradybcio@...il.com,
        martin.botka1@...il.com, linux-arm-msm@...r.kernel.org,
        phone-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] clk: qcom: gcc-sdm660: Mark MMSS NoC CFG AHB clock as critical

From: AngeloGioacchino Del Regno <kholk11@...il.com>

Similarly to MSM8998, any access to the MMSS depends on this clock.
Gating it will crash the system when RPMCC inits mmssnoc_axi_rpm_clk.

Signed-off-by: AngeloGioacchino Del Regno <kholk11@...il.com>
---
 drivers/clk/qcom/gcc-sdm660.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/clk/qcom/gcc-sdm660.c b/drivers/clk/qcom/gcc-sdm660.c
index f0b47b7d50ca..93ac77628bec 100644
--- a/drivers/clk/qcom/gcc-sdm660.c
+++ b/drivers/clk/qcom/gcc-sdm660.c
@@ -1684,6 +1684,12 @@ static struct clk_branch gcc_mmss_noc_cfg_ahb_clk = {
 		.hw.init = &(struct clk_init_data){
 			.name = "gcc_mmss_noc_cfg_ahb_clk",
 			.ops = &clk_branch2_ops,
+			/*
+			 * Any access to mmss depends on this clock.
+			 * Gating this clock has been shown to crash the system
+			 * when mmssnoc_axi_rpm_clk is inited in rpmcc.
+			 */
+			.flags = CLK_IS_CRITICAL,
 		},
 	},
 };
-- 
2.28.0