linux-kernel - [RFC PATCH 0/2] clk: sunxi-ng: a64: Remove CPUX mux switching

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-next>] [day] [month] [year] [list]

Message-Id: <20201109053358.54220-1-icenowy@aosc.io>
Date:   Mon,  9 Nov 2020 13:33:56 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     Maxime Ripard <mripard@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Ondrej Jirman <megous@...ous.com>
Cc:     linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com,
        Icenowy Zheng <icenowy@...c.io>
Subject: [RFC PATCH 0/2] clk: sunxi-ng: a64: Remove CPUX mux switching

According to Ondrej Jirman, switching of the mux of CPUX clock is one of
the sources of timer jumps on A64 (and maybe this will also lead to
timer jump on H3).

This patchset tries to remove this mux by disabling the dividers in
PLL-CPUX. Both the lack of reparent when relocking and the prevention of
PLL-CPUX dividers are behaviors of the BSP kernel.

Icenowy Zheng (2):
  clk: sunxi-ng: a64: disable dividers in PLL-CPUX
  clk: sunxi-ng: a64: disable mux and pll notifiers for CPUX reclocking

 drivers/clk/sunxi-ng/ccu-sun50i-a64.c | 93 ++++++++++++++++++++++-----
 1 file changed, 78 insertions(+), 15 deletions(-)

-- 
2.28.0