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Date:   Mon, 15 Aug 2022 10:58:11 +0300
From:   Abel Vesa <abel.vesa@linaro.org>
To:     "Peng Fan (OSS)" <peng.fan@oss.nxp.com>
Cc:     abelvesa@kernel.org, mturquette@baylibre.com, sboyd@kernel.org,
        shawnguo@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de,
        festevam@gmail.com, linux-imx@nxp.com, linux-clk@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Peng Fan <peng.fan@nxp.com>, Ye Li <ye.li@nxp.com>
Subject: Re: [PATCH V2] clk: imx8mp: tune the order of enet_qos_root_clk
Message-ID: <Yvn8k0INnkF40Oky@linaro.org>
References: <20220815013428.476015-1-peng.fan@oss.nxp.com>
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On 22-08-15 09:34:28, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@nxp.com>
> 
> The enet_qos_root_clk takes sim_enet_root_clk as parent. When
> registering enet_qos_root_clk, it will be put into clk orphan list,
> because sim_enet_root_clk is not ready.
> 
> When sim_enet_root_clk is ready, clk_core_reparent_orphans_nolock will
> set enet_qos_root_clk parent to sim_enet_root_clk.
> 
> Because CLK_OPS_PARENT_ENABLE is set, sim_enet_root_clk will be
> enabled and disabled during the enet_qos_root_clk reparent phase.
> 
> All the above are correct. But with M7 booted early and using
> enet, M7 enet feature will be broken, because clk driver probe phase
> disable the needed clks, in case M7 firmware not configure
> sim_enet_root_clk.
> 
> And tune the order would also save cpu cycles.
> 
> Reviewed-by: Ye Li <ye.li@nxp.com>
> Signed-off-by: Peng Fan <peng.fan@nxp.com>

Reviewed-by: Abel Vesa <abel.vesa@nxp.com>

> ---
> 
> V2:
>  Use Abel's new address
> 
> V1:
>  Patch got reviewed in NXP internal.
> 
>  drivers/clk/imx/clk-imx8mp.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/imx/clk-imx8mp.c b/drivers/clk/imx/clk-imx8mp.c
> index e89db568f5a8..652ae58c2735 100644
> --- a/drivers/clk/imx/clk-imx8mp.c
> +++ b/drivers/clk/imx/clk-imx8mp.c
> @@ -665,8 +665,8 @@ static int imx8mp_clocks_probe(struct platform_device *pdev)
>  	hws[IMX8MP_CLK_CAN1_ROOT] = imx_clk_hw_gate2("can1_root_clk", "can1", ccm_base + 0x4350, 0);
>  	hws[IMX8MP_CLK_CAN2_ROOT] = imx_clk_hw_gate2("can2_root_clk", "can2", ccm_base + 0x4360, 0);
>  	hws[IMX8MP_CLK_SDMA1_ROOT] = imx_clk_hw_gate4("sdma1_root_clk", "ipg_root", ccm_base + 0x43a0, 0);
> -	hws[IMX8MP_CLK_ENET_QOS_ROOT] = imx_clk_hw_gate4("enet_qos_root_clk", "sim_enet_root_clk", ccm_base + 0x43b0, 0);
>  	hws[IMX8MP_CLK_SIM_ENET_ROOT] = imx_clk_hw_gate4("sim_enet_root_clk", "enet_axi", ccm_base + 0x4400, 0);
> +	hws[IMX8MP_CLK_ENET_QOS_ROOT] = imx_clk_hw_gate4("enet_qos_root_clk", "sim_enet_root_clk", ccm_base + 0x43b0, 0);
>  	hws[IMX8MP_CLK_GPU2D_ROOT] = imx_clk_hw_gate4("gpu2d_root_clk", "gpu2d_core", ccm_base + 0x4450, 0);
>  	hws[IMX8MP_CLK_GPU3D_ROOT] = imx_clk_hw_gate4("gpu3d_root_clk", "gpu3d_core", ccm_base + 0x4460, 0);
>  	hws[IMX8MP_CLK_UART1_ROOT] = imx_clk_hw_gate4("uart1_root_clk", "uart1", ccm_base + 0x4490, 0);
> -- 
> 2.37.1
>