From: Miles Chen <miles.chen@mediatek.com>
To: <angelogioacchino.delregno@collabora.com>
Cc: <chun-jie.chen@mediatek.com>, <devicetree@vger.kernel.org>,
<drinkcat@chromium.org>, <jose.exposito89@gmail.com>,
<krzysztof.kozlowski+dt@linaro.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-clk@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<linux-mediatek@lists.infradead.org>, <matthias.bgg@gmail.com>,
<miles.chen@mediatek.com>, <mturquette@baylibre.com>,
<nfraprado@collabora.com>, <rex-bc.chen@mediatek.com>,
<robh+dt@kernel.org>, <sboyd@kernel.org>, <weiyi.lu@mediatek.com>,
<wenst@chromium.org>
Subject: Re: [PATCH 03/10] clk: mediatek: mux: add clk notifier functions
Date: Thu, 8 Sep 2022 06:59:57 +0800 [thread overview]
Message-ID: <20220907225957.10541-1-miles.chen@mediatek.com> (raw)
In-Reply-To: <20220905100416.42421-4-angelogioacchino.delregno@collabora.com>
> From: Chen-Yu Tsai <wenst@chromium.org>
>
> With device frequency scaling, the mux clock that (indirectly) feeds the
> device selects between a dedicated PLL, and some other stable clocks.
>
> When a clk rate change is requested, the (normally) upstream PLL is
> reconfigured. It's possible for the clock output of the PLL to become
> unstable during this process.
>
> To avoid causing the device to glitch, the mux should temporarily be
> switched over to another "stable" clock during the PLL rate change.
> This is done with clk notifiers.
>
> This patch adds common functions for notifiers to temporarily and
> transparently reparent mux clocks.
>
> This was loosely based on commit 8adfb08605a9 ("clk: sunxi-ng: mux: Add
> clk notifier functions").
>
Reviewed-by: Miles Chen <miles.chen@mediatek.com>
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next prev parent reply other threads:[~2022-09-07 23:32 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-05 10:04 [PATCH 00/10] MediaTek SoC safe clock muxing and GPU clocks AngeloGioacchino Del Regno
2022-09-05 10:04 ` [PATCH 01/10] arm64: dts: mt8183: Fix Mali GPU clock AngeloGioacchino Del Regno
2022-09-05 10:04 ` [PATCH 02/10] clk: mediatek: mt8183: mfgcfg: Propagate rate changes to parent AngeloGioacchino Del Regno
2022-09-05 10:04 ` [PATCH 03/10] clk: mediatek: mux: add clk notifier functions AngeloGioacchino Del Regno
2022-09-07 22:59 ` Miles Chen [this message]
2022-09-05 10:04 ` [PATCH 04/10] clk: mediatek: mt8183: Add clk mux notifier for MFG mux AngeloGioacchino Del Regno
2022-09-07 23:04 ` Miles Chen
2022-09-05 10:04 ` [PATCH 05/10] clk: mediatek: clk-mt8195-mfg: Reparent mfg_bg3d and propagate rate changes AngeloGioacchino Del Regno
2022-09-05 10:04 ` [PATCH 06/10] clk: mediatek: clk-mt8195-topckgen: Register mfg_ck_fast_ref as generic mux AngeloGioacchino Del Regno
2022-09-05 10:04 ` [PATCH 07/10] clk: mediatek: clk-mt8195-topckgen: Add GPU clock mux notifier AngeloGioacchino Del Regno
2022-09-07 23:05 ` Miles Chen
2022-09-05 10:04 ` [PATCH 08/10] clk: mediatek: clk-mt8195-topckgen: Drop univplls from mfg mux parents AngeloGioacchino Del Regno
2022-09-07 3:49 ` Chen-Yu Tsai
2022-09-07 7:46 ` AngeloGioacchino Del Regno
2022-09-05 10:04 ` [PATCH 09/10] clk: mediatek: clk-mt8192-mfg: Propagate rate changes to parent AngeloGioacchino Del Regno
2022-09-05 10:04 ` [PATCH 10/10] clk: mediatek: clk-mt8192: Add clock mux notifier for mfg_pll_sel AngeloGioacchino Del Regno
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