linux-kernel - Re: [PATCH 2/5] clk: mediatek: clk-mt8188-topckgen: Remove univpll from parents of mfg_core

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Message-ID: <3f5055ad-924b-423e-88a6-9e5d46cd8c13@collabora.com>
Date: Mon, 23 Sep 2024 10:38:19 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Pablo Sun <pablo.sun@...iatek.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Matthias Brugger <matthias.bgg@...il.com>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org,
 linux-clk@...r.kernel.org
Subject: Re: [PATCH 2/5] clk: mediatek: clk-mt8188-topckgen: Remove univpll
 from parents of mfg_core_tmp

Il 20/09/24 15:41, Pablo Sun ha scritto:
> Same as MT8195, MT8188 GPU clock is primarly supplied by the dedicated
> mfgpll. The clock "mfg_core_tmp" is only used as an alt clock when
> setting mfgpll clock rate.
> 
> If we keep the univpll parents from mfg_core_tmp, when setting
> GPU frequency to 390000000, the common clock framework would switch
> the parent to univpll, instead of setting mfgpll to 390000000:
> 
>      mfgpll                            0        0        0   949999756
>      univpll                           2        2        0  2340000000
>         univpll_d6                     1        1        0   390000000
>            top_mfg_core_tmp            1        1        0   390000000
>               mfg_ck_fast_ref          1        1        0   390000000
>                  mfgcfg_bg3d           1        1        0   390000000
> 
> This results in failures when subsequent devfreq operations need to
> switch to other frequencies. So remove univpll from the parent list.
> 
> This solution is taken from commit 72d38ed720e9 ("clk: mediatek:
> clk-mt8195-topckgen: Drop univplls from mfg mux parents")
> 
> Signed-off-by: Pablo Sun <pablo.sun@...iatek.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>