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Date:   Sat, 19 Nov 2022 11:11:58 +0800
From:   Shawn Guo <shawnguo@kernel.org>
To:     "Peng Fan (OSS)" <peng.fan@oss.nxp.com>
Cc:     s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com,
        linux-imx@nxp.com, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        Haibo Chen <haibo.chen@nxp.com>, Peng Fan <peng.fan@nxp.com>,
        Marco Felsch <m.felsch@pengutronix.de>
Subject: Re: [PATCH V6 11/12] arm64: dts: imx8m[m,q]-evk: change to use
 off-on-delay-us in regulator
Message-ID: <20221119031157.GL16229@T480>
References: <20221117095403.1876071-1-peng.fan@oss.nxp.com>
 <20221117095403.1876071-12-peng.fan@oss.nxp.com>
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On Thu, Nov 17, 2022 at 05:54:02PM +0800, Peng Fan (OSS) wrote:
> From: Haibo Chen <haibo.chen@nxp.com>
> 
> Some SD Card controller and power circuitry has increased capacitance,
> so the usual toggling of regulator to power the card off and on
> is insufficient.
> 
> According to SD spec, for sd card power reset operation, the sd card
> supply voltage needs to be lower than 0.5v and keep over 1ms, otherwise,
> next time power back the sd card supply voltage to 3.3v, sd card can't
> support SD3.0 mode again.
> 
> This patch add the off-on-delay-us, make sure the sd power reset behavior
> is align with the specification. Without this patch, when do quick system
> suspend/resume test, some sd card can't work at SD3.0 mode after system
> resume back.
> 
> Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
> Signed-off-by: Peng Fan <peng.fan@nxp.com>
> Reviewed-by: Marco Felsch <m.felsch@pengutronix.de>

Applied, thanks!