From: Peng Fan <peng.fan@nxp.com> To: Stephen Boyd <sboyd@kernel.org>, "Peng Fan (OSS)" <peng.fan@oss.nxp.com>, Abel Vesa <abel.vesa@nxp.com>, "s.hauer@pengutronix.de" <s.hauer@pengutronix.de>, "shawnguo@kernel.org" <shawnguo@kernel.org> Cc: "kernel@pengutronix.de" <kernel@pengutronix.de>, "festevam@gmail.com" <festevam@gmail.com>, dl-linux-imx <linux-imx@nxp.com>, "linux-clk@vger.kernel.org" <linux-clk@vger.kernel.org>, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org> Subject: RE: [PATCH V2 2/2] clk: imx8m: check mcore_booted before register clk Date: Fri, 18 Mar 2022 01:15:51 +0000 [thread overview] Message-ID: <PA4PR04MB9416FE8A48930C7F932CA09888139@PA4PR04MB9416.eurprd04.prod.outlook.com> (raw) In-Reply-To: <20220317193815.47BC1C340E9@smtp.kernel.org> > Subject: Re: [PATCH V2 2/2] clk: imx8m: check mcore_booted before register > clk > > Quoting Peng Fan (OSS) (2022-02-28 04:41:12) > > From: Peng Fan <peng.fan@nxp.com> > > > > If mcore_booted is true, ignore the clk root gate registration and > > this will simplify AMP clock management and avoid system hang > > unexpectly especially Linux shutdown clk used by mcore. > > > > Signed-off-by: Peng Fan <peng.fan@nxp.com> > > --- > > > > V2: > > None > > > > drivers/clk/imx/clk-composite-8m.c | 21 +++++++++++++-------- > > 1 file changed, 13 insertions(+), 8 deletions(-) > > > > diff --git a/drivers/clk/imx/clk-composite-8m.c > > b/drivers/clk/imx/clk-composite-8m.c > > index 2dfd6149e528..b16c2c0ea9f6 100644 > > --- a/drivers/clk/imx/clk-composite-8m.c > > +++ b/drivers/clk/imx/clk-composite-8m.c > > @@ -223,14 +223,19 @@ struct clk_hw > *__imx8m_clk_hw_composite(const char *name, > > div->lock = &imx_ccm_lock; > > div->flags = CLK_DIVIDER_ROUND_CLOSEST; > > > > - gate = kzalloc(sizeof(*gate), GFP_KERNEL); > > - if (!gate) > > - goto fail; > > - > > - gate_hw = &gate->hw; > > - gate->reg = reg; > > - gate->bit_idx = PCG_CGC_SHIFT; > > - gate->lock = &imx_ccm_lock; > > + /* skip registering the gate ops if M4 is enabled */ > > + if (mcore_booted) { > > + gate_hw = NULL; > > It could even use the protected-clocks property and then parse it to figure out > to not register this gate? Because of hardware design as I replied in patch 1/2, that means we will add hundreds of clk entry in device tree. I would not do that. Thanks, Peng. > > > + } else { > > + gate = kzalloc(sizeof(*gate), GFP_KERNEL); > > + if (!gate) > > + goto fail; > > + > > + gate_hw = &gate->hw; > > + gate->reg = reg; > > + gate->bit_idx = PCG_CGC_SHIFT; > > + gate->lock = &imx_ccm_lock; > > + }
WARNING: multiple messages have this Message-ID (diff)
From: Peng Fan <peng.fan@nxp.com> To: Stephen Boyd <sboyd@kernel.org>, "Peng Fan (OSS)" <peng.fan@oss.nxp.com>, Abel Vesa <abel.vesa@nxp.com>, "s.hauer@pengutronix.de" <s.hauer@pengutronix.de>, "shawnguo@kernel.org" <shawnguo@kernel.org> Cc: "kernel@pengutronix.de" <kernel@pengutronix.de>, "festevam@gmail.com" <festevam@gmail.com>, dl-linux-imx <linux-imx@nxp.com>, "linux-clk@vger.kernel.org" <linux-clk@vger.kernel.org>, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org> Subject: RE: [PATCH V2 2/2] clk: imx8m: check mcore_booted before register clk Date: Fri, 18 Mar 2022 01:15:51 +0000 [thread overview] Message-ID: <PA4PR04MB9416FE8A48930C7F932CA09888139@PA4PR04MB9416.eurprd04.prod.outlook.com> (raw) In-Reply-To: <20220317193815.47BC1C340E9@smtp.kernel.org> > Subject: Re: [PATCH V2 2/2] clk: imx8m: check mcore_booted before register > clk > > Quoting Peng Fan (OSS) (2022-02-28 04:41:12) > > From: Peng Fan <peng.fan@nxp.com> > > > > If mcore_booted is true, ignore the clk root gate registration and > > this will simplify AMP clock management and avoid system hang > > unexpectly especially Linux shutdown clk used by mcore. > > > > Signed-off-by: Peng Fan <peng.fan@nxp.com> > > --- > > > > V2: > > None > > > > drivers/clk/imx/clk-composite-8m.c | 21 +++++++++++++-------- > > 1 file changed, 13 insertions(+), 8 deletions(-) > > > > diff --git a/drivers/clk/imx/clk-composite-8m.c > > b/drivers/clk/imx/clk-composite-8m.c > > index 2dfd6149e528..b16c2c0ea9f6 100644 > > --- a/drivers/clk/imx/clk-composite-8m.c > > +++ b/drivers/clk/imx/clk-composite-8m.c > > @@ -223,14 +223,19 @@ struct clk_hw > *__imx8m_clk_hw_composite(const char *name, > > div->lock = &imx_ccm_lock; > > div->flags = CLK_DIVIDER_ROUND_CLOSEST; > > > > - gate = kzalloc(sizeof(*gate), GFP_KERNEL); > > - if (!gate) > > - goto fail; > > - > > - gate_hw = &gate->hw; > > - gate->reg = reg; > > - gate->bit_idx = PCG_CGC_SHIFT; > > - gate->lock = &imx_ccm_lock; > > + /* skip registering the gate ops if M4 is enabled */ > > + if (mcore_booted) { > > + gate_hw = NULL; > > It could even use the protected-clocks property and then parse it to figure out > to not register this gate? Because of hardware design as I replied in patch 1/2, that means we will add hundreds of clk entry in device tree. I would not do that. Thanks, Peng. > > > + } else { > > + gate = kzalloc(sizeof(*gate), GFP_KERNEL); > > + if (!gate) > > + goto fail; > > + > > + gate_hw = &gate->hw; > > + gate->reg = reg; > > + gate->bit_idx = PCG_CGC_SHIFT; > > + gate->lock = &imx_ccm_lock; > > + } _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2022-03-18 1:15 UTC|newest] Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-02-28 12:41 [PATCH V2 1/2] clk: imx: add mcore_booted module paratemter Peng Fan (OSS) 2022-02-28 12:41 ` Peng Fan (OSS) 2022-02-28 12:41 ` [PATCH V2 2/2] clk: imx8m: check mcore_booted before register clk Peng Fan (OSS) 2022-02-28 12:41 ` Peng Fan (OSS) 2022-03-17 19:38 ` Stephen Boyd 2022-03-17 19:38 ` Stephen Boyd 2022-03-18 1:15 ` Peng Fan [this message] 2022-03-18 1:15 ` Peng Fan 2022-04-12 8:11 ` Abel Vesa 2022-04-12 8:11 ` Abel Vesa 2022-04-12 8:14 ` Abel Vesa 2022-04-12 8:14 ` Abel Vesa 2022-03-17 19:37 ` [PATCH V2 1/2] clk: imx: add mcore_booted module paratemter Stephen Boyd 2022-03-17 19:37 ` Stephen Boyd 2022-03-18 1:14 ` Peng Fan 2022-03-18 1:14 ` Peng Fan 2022-04-12 7:58 ` Abel Vesa 2022-04-12 7:58 ` Abel Vesa 2022-04-12 10:48 ` Abel Vesa 2022-04-12 10:48 ` Abel Vesa
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