[PATCH 4.20 166/352] clk: qcom: Leave mmss noc on for 8998

[Greg Kroah-Hartman]

4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit 12eced09cd301aa7b1868a67c50a651c2aacd363 ]

Similar to other qcom targets, gcc_mmss_noc_cfg_ahb_clk should not be
disabled.  Any mmss access depends on this clock, and its been observed
that enabling mmssnoc_axi_rpm_clk with rpmcc results in an implicit
access to mmss and will crash the system if gcc_mmss_noc_cfg_ahb_clk is
disabled.

Signed-off-by: Jeffrey Hugo <jhugo@xxxxxxxxxxxxxx>
Fixes: 4807c71cc688 (arm64: dts: Add msm8998 SoC and MTP board support)
Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/clk/qcom/gcc-msm8998.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/clk/qcom/gcc-msm8998.c b/drivers/clk/qcom/gcc-msm8998.c
index 9f0ae403d5f5..cb714c3e2924 100644
--- a/drivers/clk/qcom/gcc-msm8998.c
+++ b/drivers/clk/qcom/gcc-msm8998.c
@@ -2042,6 +2042,12 @@ 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,
 		},
 	},
 };
-- 
2.19.1