From: Stanislaw Pal <kuncy7@gmail.com>
To: Jie Luo <jie.luo@oss.qualcomm.com>,
	Stephen Boyd <sboyd@kernel.org>
Cc: Bjorn Andersson <andersson@kernel.org>,
	Michael Turquette <mturquette@baylibre.com>,
	Brian Masney <bmasney@redhat.com>,
	Mieczyslaw Nalewaj <namiltd@yahoo.com>,
	Georg Seema <georgseema@gmail.com>,
	linux-arm-msm@vger.kernel.org,
	linux-clk@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	stable@vger.kernel.org
Subject: Re: [PATCH v3] clk: qcom: ipq-cmn-pll: keep the CMN block bus clocks enabled
Date: Tue, 11 Aug 2026 13:48:31 +0200
Message-ID: <20260811114831.85417-1-kuncy7@gmail.com>
In-Reply-To: <20260805193638.15327-1-kuncy7@gmail.com>
References: <20260805193638.15327-1-kuncy7@gmail.com>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

Recording a tag that came in off-list, so it does not get lost: a second
user hit the same hang independently, on a board neither I nor anyone in
this thread has touched.

Georg Seema is bringing up a Cudy P5 (also IPQ5018). Without this patch
the board hangs during boot; with it applied it boots reliably. He found
the patch on his own while debugging that hang, and gave the tag on the
OpenWrt pull request that carries it:

  https://github.com/openwrt/openwrt/pull/24653

Tested-by: Georg Seema <georgseema@gmail.com>

That makes three IPQ5018 boards from three vendors - TP-Link Archer AX55
v1, GL.iNet GL-B3000 and Cudy P5 - where gating the CMN block bus clocks
after probe kills the boot, and holding the reference fixes it.

I am not repeating the earlier arguments here. The bisection of the
fatal access is still on my list and I will come back with v4 and a
corrected explanation once I have named the register and the code path,
rather than before.

Thanks,
Stanislaw