diff options
| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2019-12-11 16:52:22 +0300 |
|---|---|---|
| committer | Geert Uytterhoeven <geert+renesas@glider.be> | 2020-02-10 15:44:29 +0300 |
| commit | 408324a3c5383716939eea8096a0f999a0665f7e (patch) | |
| tree | 02700b0c6edcbc8bbf6c395deeedf71194b851e3 /drivers/soc/renesas | |
| parent | bb6d3fb354c5ee8d6bde2d576eb7220ea09862b9 (diff) | |
| download | linux-408324a3c5383716939eea8096a0f999a0665f7e.tar.xz | |
ARM: shmobile: Enable ARM_GLOBAL_TIMER on Cortex-A9 MPCore SoCs
SH-Mobile AG5 and R-Car H1 SoCs are based on the Cortex-A9 MPCore, which
includes a global timer.
Enable the ARM global timer on these SoCs, which will be used for:
- the scheduler clock, improving scheduler accuracy from 10 ms to 3 or
4 ns,
- delay loops, allowing removal of calls to shmobile_init_delay() from
the corresponding machine vectors.
Note that when using an old DTB lacking the global timer, the kernel
will still work. However, loops-per-jiffies will no longer be preset,
and the delay loop will need to be calibrated during boot.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20191211135222.26770-5-geert+renesas@glider.be
Diffstat (limited to 'drivers/soc/renesas')
| -rw-r--r-- | drivers/soc/renesas/Kconfig | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/soc/renesas/Kconfig b/drivers/soc/renesas/Kconfig index ba2b8b51d2d9..de5cfe3fddd3 100644 --- a/drivers/soc/renesas/Kconfig +++ b/drivers/soc/renesas/Kconfig @@ -116,6 +116,7 @@ config ARCH_R8A7779 bool "R-Car H1 (R8A77790)" select ARCH_RCAR_GEN1 select ARM_ERRATA_754322 + select ARM_GLOBAL_TIMER select HAVE_ARM_SCU if SMP select HAVE_ARM_TWD if SMP select SYSC_R8A7779 @@ -163,6 +164,7 @@ config ARCH_SH73A0 bool "SH-Mobile AG5 (R8A73A00)" select ARCH_RMOBILE select ARM_ERRATA_754322 + select ARM_GLOBAL_TIMER select HAVE_ARM_SCU if SMP select HAVE_ARM_TWD if SMP select RENESAS_INTC_IRQPIN |