diff options
| author |   Geert Uytterhoeven <geert+renesas@glider.be> | 2019-12-11 14:52:22 +0100 |
|---|---|---|
| committer | Geert Uytterhoeven <geert+renesas@glider.be> | 2020-02-10 13:44:29 +0100 |
| commit | 408324a3c5383716939eea8096a0f999a0665f7e (patch) | |
| tree | 02700b0c6edcbc8bbf6c395deeedf71194b851e3 /arch/arm/mach-shmobile | |
| parent | Linux 5.6-rc1 (diff) | |
| download | linux-dev-408324a3c5383716939eea8096a0f999a0665f7e.tar.xz linux-dev-408324a3c5383716939eea8096a0f999a0665f7e.zip | |
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 'arch/arm/mach-shmobile')
| -rw-r--r-- | arch/arm/mach-shmobile/setup-r8a7779.c | 1 | ||||
| -rw-r--r-- | arch/arm/mach-shmobile/setup-sh73a0.c | 1 |
2 files changed, 0 insertions, 2 deletions
diff --git a/arch/arm/mach-shmobile/setup-r8a7779.c b/arch/arm/mach-shmobile/setup-r8a7779.c index b13ec9088ce5..86406e3f9b22 100644 --- a/arch/arm/mach-shmobile/setup-r8a7779.c +++ b/arch/arm/mach-shmobile/setup-r8a7779.c @@ -72,7 +72,6 @@ static const char *const r8a7779_compat_dt[] __initconst = { DT_MACHINE_START(R8A7779_DT, "Generic R8A7779 (Flattened Device Tree)") .smp = smp_ops(r8a7779_smp_ops), .map_io = r8a7779_map_io, - .init_early = shmobile_init_delay, .init_irq = r8a7779_init_irq_dt, .init_late = shmobile_init_late, .dt_compat = r8a7779_compat_dt, diff --git a/arch/arm/mach-shmobile/setup-sh73a0.c b/arch/arm/mach-shmobile/setup-sh73a0.c index cc08aa752244..eb4a62fa4289 100644 --- a/arch/arm/mach-shmobile/setup-sh73a0.c +++ b/arch/arm/mach-shmobile/setup-sh73a0.c @@ -56,7 +56,6 @@ static const char *const sh73a0_boards_compat_dt[] __initconst = { DT_MACHINE_START(SH73A0_DT, "Generic SH73A0 (Flattened Device Tree)") .smp = smp_ops(sh73a0_smp_ops), .map_io = sh73a0_map_io, - .init_early = shmobile_init_delay, .init_machine = sh73a0_generic_init, .init_late = shmobile_init_late, .dt_compat = sh73a0_boards_compat_dt, |