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arch: arm: mach-k3: Workaround errata ID i2331

Safae Ouajih requested to merge souajih/add_persist into integ/ti-u-boot-2021.01

Errata doc: https://www.ti.com/lit/er/sprz457e/sprz457e.pdf

Errata ID i2331 CPSW: Device lockup when reading CPSW registers

Details: A device lockup can occur during the second read of any CPSW subsystem register after any MAIN domain power on reset (POR). A MAIN domain POR occurs using the hardware MCU_PORz signal, or via software using CTRLMMR_RST_CTRL.SW_MAIN_POR or CTRLMMR_MCU_RST_CTRL.SW_MAIN_POR. After these resets, the processor and internal bus structures may get into a state which is only recoverable with full device reset using MCU_PORz. Due to this errata, Ethernet boot should not be used on this device.

Workaround(s): To avoid the lockup, a warm reset should be issued after a MAIN domain POR and before any access to the CPSW registers. The warm reset realigns internal clocks and prevents the lockup from happening. Workaround above errata by calling do_reset() in case of cold boot in order to trigger warm reset. This needs enabling SYSRESET driver in R5 SPL to enable TI SCI reset driver.

Signed-off-by: Nitin Yadav n-yadav@ti.com

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