From mboxrd@z Thu Jan 1 00:00:00 1970 From: sbabic at denx.de Date: Sat, 26 Dec 2020 16:54:06 +0100 (CET) Subject: [PATCH v3 1/3] ARM: dts: imx8m: increase off-on delay on the SD Vcc regulator In-Reply-To: <20201205172919.3421-2-andrey.zhizhikin@leica-geosystems.com> Message-ID: <20201226155406.DABD88269B@phobos.denx.de> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de > Some SD Card controller and power circuitry has increased capacitance, > which keeps the internal logic remains powered after regulator is switch > off. This is generally the case when card is switched to SD104 mode, > where a power cycle should be performed. In case if the card internal > logic remains powered, it causes a subsequent failure of mode > transition, effectively leading to failed enumeration. > Introduce a delay of 20 msec in order to provide a possibility for > internal card circuitry to drain voltages and perform a power cycle > correctly. > Similar fix is done in commit c49d0ac38a76 ("ARM: dts: rmobile: Increase > off-on delay on the SD Vcc regulator") targeted Renesas SOCs. > Signed-off-by: Andrey Zhizhikin > Cc: Stefano Babic Applied to u-boot-imx, master, thanks ! Best regards, Stefano Babic -- ===================================================================== DENX Software Engineering GmbH, Managing Director: Wolfgang Denk HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: +49-8142-66989-53 Fax: +49-8142-66989-80 Email: sbabic at denx.de =====================================================================