[PATCH] armv8: Initialize CNTFRQ if at highest exception level

[Tom Rini]

On Mon, Jul 12, 2021 at 03:04:21PM +0100, Peter Hoyes wrote:

> From: Peter Hoyes <Peter.Hoyes at arm.com>
> 
> CNTFRQ_EL0 is only writable from the highest supported exception
> level on the platform. For Armv8-A, this is typically EL3, but
> technically EL2 and EL3 are optional so it may need to be
> initialized at EL2 or EL1. For Armv8-R, the highest exception
> level is always EL2.
> 
> This patch moves the initialization outside of the switch_el
> block and uses a new macro branch_if_not_highest_el which
> dynamically detects whether it is at the highest supported
> exception level.
> 
> Linux's docs state that CNTFRQ_EL0 should be initialized by the
> bootloader. If not set, the the U-Boot prompt countdown hangs.
> 
> Signed-off-by: Peter Hoyes <Peter.Hoyes at arm.com>

Applied to u-boot/master, thanks!

-- 
Tom
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