diff options
| author | Andre Przywara | 2018-06-27 01:42:53 +0100 |
|---|---|---|
| committer | Jagan Teki | 2018-07-03 22:00:00 +0530 |
| commit | be0d217952222b2bd3ed071de9bb0c66d8cc80d9 (patch) | |
| tree | 54129545162b45102f9c1a80bee4f96e51248667 /arch/arm/mach-sunxi | |
| parent | 38651588d3d9a977ca457049d6357408ddad4a8b (diff) | |
arm: timer: sunxi: add Allwinner timer erratum workaround
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@arm.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Tested-by: Jagan Teki <jagan@amarulasolutions.com>
Tested-by: Andreas Färber <afaerber@suse.de>
Tested-by: Guillaume Gardet <guillaume.gardet@free.fr>
Diffstat (limited to 'arch/arm/mach-sunxi')
| -rw-r--r-- | arch/arm/mach-sunxi/Kconfig | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm/mach-sunxi/Kconfig b/arch/arm/mach-sunxi/Kconfig index a3f77230286..3624a03947f 100644 --- a/arch/arm/mach-sunxi/Kconfig +++ b/arch/arm/mach-sunxi/Kconfig @@ -84,6 +84,9 @@ config SUNXI_HIGH_SRAM Chips using the latter setup are supposed to select this option to adjust the addresses accordingly. +config SUNXI_A64_TIMER_ERRATUM + bool + # Note only one of these may be selected at a time! But hidden choices are # not supported by Kconfig config SUNXI_GEN_SUN4I @@ -270,6 +273,7 @@ config MACH_SUN50I select SUNXI_DRAM_DW_32BIT select FIT select SPL_LOAD_FIT + select SUNXI_A64_TIMER_ERRATUM config MACH_SUN50I_H5 bool "sun50i (Allwinner H5)" |