[PATCHv3] arm64: gic-v3-its: Clear the Pending table before enabling LPIs

[Tom Rini <trini@konsulko.com>]

On Fri, Mar 05, 2021 at 03:02:35PM +0800, Zhiqiang Hou wrote:

> From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
> 
> The GICv3 RM requires "The first 1KB of memory for the LPI Pending tables
> must contain only zeros on initial allocation, and this must be visible
> to the Redistributors, or else the effect is UNPREDICTABLE".
> 
> And as the following statement, we here clear the whole Pending tables
> instead of the first 1KB.
> "An LPI Pending table that contains only zeros, including in the first 1KB,
> indicates that there are no pending LPIs.
> The first 1KB of the LPI Pending table is IMPLEMENTATION DEFINED. However,
> if the first 1KB of the LPI Pending table and the rest of the table contain
> only zeros, this must indicate that there are no pending LPIs."
> 
> And there isn't any pending LPI under U-Boot, so it's unnecessary to
> load the contents of the Pending table during the enablement, then set
> the GICR_PENDBASER.PTZ flag.
> 
> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
> Tested-by: Vladimir Oltean <vladimir.oltean@nxp.com> # NXP LS1028A
> Reviewed-by: Wasim Khan <wasim.khan@nxp.com>

Applied to u-boot/master, thanks!

-- 
Tom
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