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charset=UTF-8 Content-Transfer-Encoding: 7bit On 19/08/2024 22:43, Judith Mendez wrote: > SK-AM62A-LP is a device targeting automotive front-camera applications > among other use-cases. It utilizes the TPS6593x PMIC (interfaced over I2C) > to power the SoC and various other peripherals on the board [1]. > > MMCSD requires the PMIC to be setup correctly before setting the bus > pins to 1.8V using the TPS6594 driver interfaced over i2c. > > Currently, the following could be seen when booting the am62ax platform: > > "platform fa00000.mmc: deferred probe pending: platform: supplier regulator-5 not ready" > "vdd_mmc1: disabling" > > and a failure to boot the SK-AM62A-LP. > > One solution is to use initramfs [2], but using initramfs increases the > boot time for this automotive solution which requires faster boot time > parameters. This is a defconfig, not a distro/product config, so your product constraints are not really relevant. You are supposed to boot defconfig with proper initramfs with necessary modules. I don't get why people mistake defconfig with their product stuff... > > Another solution is to change MFD_TPS6594_I2C to built-in, that way the > PMIC is setup and the regulators are ready before MMCSD switches to UHS > mode, this is the preferred solution since it does not increase boot time > like the initramfs solution does. Use initramfs. Several devices, e.g. most Android ones, have fixed size of boot partition, so size of kernel is important. > > [1] https://www.ti.com/lit/zip/sprr459 > [2] https://lore.kernel.org/linux-devicetree/5f03207b-c29b-4d16-92b0-d14eef77bf17@linaro.org/ > Fixes: f9010eb938be ("arm64: defconfig: Enable TPS6593 PMIC for SK-AM62A") No bug here to be fixed. You miss initramfs. > > Signed-off-by: Judith Mendez Best regards, Krzysztof