linux-kernel - [PATCH v4 1/5] clk: qcom: ipq5018: keep XO clock always on

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]

Message-Id: <20250516-ipq5018-cmn-pll-v4-1-389a6b30e504@outlook.com>
Date: Fri, 16 May 2025 16:36:08 +0400
From: George Moussalem via B4 Relay <devnull+george.moussalem.outlook.com@...nel.org>
To: Bjorn Andersson <andersson@...nel.org>, 
 Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Luo Jie <quic_luoj@...cinc.com>, 
 Lee Jones <lee@...nel.org>, Konrad Dybcio <konradybcio@...nel.org>, 
 Arnd Bergmann <arnd@...db.de>
Cc: linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 George Moussalem <george.moussalem@...look.com>
Subject: [PATCH v4 1/5] clk: qcom: ipq5018: keep XO clock always on

From: George Moussalem <george.moussalem@...look.com>

The XO clock must not be disabled to avoid the kernel trying to disable
the it. As such, keep the XO clock always on by flagging it as critical.

Signed-off-by: George Moussalem <george.moussalem@...look.com>
---
The kernel will panic when parenting it under the CMN PLL reference
clock and the below message will appear in the kernel logs.

[    0.916515] ------------[ cut here ]------------
[    0.918890] gcc_xo_clk_src status stuck at 'on'
[    0.918944] WARNING: CPU: 0 PID: 8 at drivers/clk/qcom/clk-branch.c:86 clk_branch_wait+0x114/0x124
[    0.927926] Modules linked in:
[    0.936945] CPU: 0 PID: 8 Comm: kworker/0:0 Not tainted 6.6.74 #0
[    0.939982] Hardware name: Linksys MX2000 (DT)
[    0.946151] Workqueue: pm pm_runtime_work
[    0.950489] pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[    0.954566] pc : clk_branch_wait+0x114/0x124
[    0.961335] lr : clk_branch_wait+0x114/0x124
[    0.965849] sp : ffffffc08181bb50
[    0.970101] x29: ffffffc08181bb50 x28: 0000000000000000 x27: 61c8864680b583eb
[    0.973317] x26: ffffff801fec2168 x25: ffffff800000abc0 x24: 0000000000000002
[    0.980437] x23: ffffffc0809f6fd8 x22: 0000000000000000 x21: ffffffc08044193c
[    0.985276] loop: module loaded
[    0.987554] x20: 0000000000000000 x19: ffffffc081749278 x18: 000000000000007c
[    0.987573] x17: 0000000091706274 x16: 000000001985c4f7 x15: ffffffc0816bbdf0
[    0.987587] x14: 0000000000000174 x13: 000000000000007c x12: 00000000ffffffea
[    0.987601] x11: 00000000ffffefff x10: ffffffc081713df0 x9 : ffffffc0816bbd98
[    0.987615] x8 : 0000000000017fe8 x7 : c0000000ffffefff x6 : 0000000000057fa8
[    1.026268] x5 : 0000000000000fff x4 : 0000000000000000 x3 : ffffffc08181b950
[    1.033385] x2 : ffffffc0816bbd30 x1 : ffffffc0816bbd30 x0 : 0000000000000023
[    1.040507] Call trace:
[    1.047618]  clk_branch_wait+0x114/0x124
[    1.049875]  clk_branch2_disable+0x2c/0x3c
[    1.054043]  clk_core_disable+0x60/0xac
[    1.057948]  clk_core_disable+0x68/0xac
[    1.061681]  clk_disable+0x30/0x4c
[    1.065499]  pm_clk_suspend+0xd4/0xfc
[    1.068971]  pm_generic_runtime_suspend+0x2c/0x44
[    1.072705]  __rpm_callback+0x40/0x1bc
[    1.077392]  rpm_callback+0x6c/0x78
[    1.081038]  rpm_suspend+0xf0/0x5c0
[    1.084423]  pm_runtime_work+0xf0/0xfc
[    1.087895]  process_one_work+0x17c/0x2f8
[    1.091716]  worker_thread+0x2e8/0x4d4
[    1.095795]  kthread+0xdc/0xe0
[    1.099440]  ret_from_fork+0x10/0x20
[    1.102480] ---[ end trace 0000000000000000 ]---
---
 drivers/clk/qcom/gcc-ipq5018.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/qcom/gcc-ipq5018.c b/drivers/clk/qcom/gcc-ipq5018.c
index 70f5dcb96700f55da1fb19fc893d22350a7e63bf..24eb4c40da63462077ee2e5714e838aa30ced2e3 100644
--- a/drivers/clk/qcom/gcc-ipq5018.c
+++ b/drivers/clk/qcom/gcc-ipq5018.c
@@ -1371,7 +1371,7 @@ static struct clk_branch gcc_xo_clk = {
 				&gcc_xo_clk_src.clkr.hw,
 			},
 			.num_parents = 1,
-			.flags = CLK_SET_RATE_PARENT,
+			.flags = CLK_SET_RATE_PARENT | CLK_IS_CRITICAL,
 			.ops = &clk_branch2_ops,
 		},
 	},

-- 
2.49.0