[U-Boot] [PATCH 2/2] arm: timer: sunxi: add Allwinner timer erratum workaround

[Jagan Teki]

On Wed, Jun 27, 2018 at 6:12 AM, Andre Przywara <andre.przywara at arm.com> wrote:
> The Allwinner A64 SoCs suffers from an arch timer implementation erratum,
> where sometimes the lower 11 bits of the counter value erroneously
> become all 0's or all 1's [1]. This leads to sudden jumps, both forwards and
> backwards, with the latter one often showing weird behaviour.
> Port the workaround proposed for Linux to U-Boot and activate it for all
> A64 boards.
> This fixes crashes when accessing MMC devices (SD cards), caused by a
> recent change to actually use the counter value for timeout checks.
>
> Fixes: 5ff8e54888e4d26a352453564f7f599d29696dc9 ("sunxi: improve throughput
> in the sunxi_mmc driver")
>
> [1] http://lists.infradead.org/pipermail/linux-arm-kernel/2018-May/576886.html
>
> Signed-off-by: Andre Przywara <andre.przywara at arm.com>
> ---

Tested-by: Jagan Teki <jagan at amarulasolutions.com>