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Thu, 6 May 2021 06:56:38 +0000 Subject: Re: [PATCH V2 13/13] soc: imx: gpcv2: move reset assert after requesting domain power up To: "Peng Fan (OSS)" , robh+dt@kernel.org, shawnguo@kernel.org, s.hauer@pengutronix.de Cc: kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com, p.zabel@pengutronix.de, l.stach@pengutronix.de, krzk@kernel.org, agx@sigxcpu.org, marex@denx.de, andrew.smirnov@gmail.com, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, ping.bai@nxp.com, aford173@gmail.com, abel.vesa@nxp.com, Peng Fan References: <20210506010440.7016-1-peng.fan@oss.nxp.com> <20210506010440.7016-14-peng.fan@oss.nxp.com> From: Frieder Schrempf Message-ID: Date: Thu, 6 May 2021 08:56:35 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1 In-Reply-To: <20210506010440.7016-14-peng.fan@oss.nxp.com> Content-Language: en-US X-Originating-IP: [89.244.180.42] X-ClientProxiedBy: FR0P281CA0051.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:48::12) To AM0PR10MB2963.EURPRD10.PROD.OUTLOOK.COM (2603:10a6:208:157::14) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [192.168.10.27] (89.244.180.42) by FR0P281CA0051.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:48::12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4129.12 via Frontend Transport; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 06.05.21 03:04, Peng Fan (OSS) wrote: > From: Peng Fan > > The i.MX8MM VPU power up sequence is a bit special, it must follow: > 1. request power up > 2. reset assert > 3. reset deassert > > This change in this patch will not affect other domains, because > the power domain default is in asserted state, unless bootloader > deassert the reset. It also applies to GPU power domain. > > Signed-off-by: Peng Fan I don't really like that there is a dependency on TF-A/bootloader as we never really know what they will do, but from my point of view the approach is ok and it seems to work properly as far as I have tested it (only with GPU). Reviewed-by: Frieder Schrempf Tested-by: Frieder Schrempf > --- > drivers/soc/imx/gpcv2.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/soc/imx/gpcv2.c b/drivers/soc/imx/gpcv2.c > index 65b562cbcc6d..325a34833ffa 100644 > --- a/drivers/soc/imx/gpcv2.c > +++ b/drivers/soc/imx/gpcv2.c > @@ -217,8 +217,6 @@ static int imx_pgc_power_up(struct generic_pm_domain *genpd) > goto out_regulator_disable; > } > > - reset_control_assert(domain->reset); > - > if (domain->bits.pxx) { > /* request the domain to power up */ > regmap_update_bits(domain->regmap, GPC_PU_PGC_SW_PUP_REQ, > @@ -241,6 +239,8 @@ static int imx_pgc_power_up(struct generic_pm_domain *genpd) > GPC_PGC_CTRL_PCR); > } > > + reset_control_assert(domain->reset); > + > /* delay for reset to propagate */ > udelay(5); > > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel