[PATCH] arm: mach-k3: Workaround errata ID i2331

[Tom Rini]

On Thu, Apr 06, 2023 at 01:29:36PM +0530, Vignesh Raghavendra wrote:

> From: Nitin Yadav <n-yadav at ti.com>
> 
> Errata doc: https://www.ti.com/lit/pdf/sprz457
> 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 at ti.com>
> Signed-off-by: Vignesh Raghavendra <vigneshr at ti.com>
> Reviewed-by: Bryan Brattlof <bb at ti.com>

Applied to u-boot/master, thanks!

-- 
Tom
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