Hi,
On Wed, Feb 25, 2015 at 04:39:51PM +0800, Hanjun Guo wrote:
> From: Graeme Gregory <graeme.gregory@xxxxxxxxxx>
>
> There are two flags: PSCI_COMPLIANT and PSCI_USE_HVC. When set,
> the former signals to the OS that the firmware is PSCI compliant.
> The latter selects the appropriate conduit for PSCI calls by
> toggling between Hypervisor Calls (HVC) and Secure Monitor Calls
> (SMC).
>
> FADT table contains such information in ACPI 5.1, FADT table was
> parsed in ACPI table init and copy to struct acpi_gbl_FADT, so
> use the flags in struct acpi_gbl_FADT for PSCI init.
>
> Since ACPI 5.1 doesn't support self defined PSCI function IDs,
> which means that only PSCI 0.2+ is supported in ACPI.
>
> CC: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
> CC: Catalin Marinas <catalin.marinas@xxxxxxx>
> CC: Will Deacon <will.deacon@xxxxxxx>
> Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
> Tested-by: Yijing Wang <wangyijing@xxxxxxxxxx>
> Tested-by: Mark Langsdorf <mlangsdo@xxxxxxxxxx>
> Tested-by: Jon Masters <jcm@xxxxxxxxxx>
> Tested-by: Timur Tabi <timur@xxxxxxxxxxxxxx>
> Tested-by: Robert Richter <rrichter@xxxxxxxxxx>
> Acked-by: Robert Richter <rrichter@xxxxxxxxxx>
> Signed-off-by: Graeme Gregory <graeme.gregory@xxxxxxxxxx>
> Signed-off-by: Tomasz Nowicki <tomasz.nowicki@xxxxxxxxxx>
> Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
Acked-by: Olof Johansson <olof@xxxxxxxxx>
However, a comment on the color of the bike shed below. I'm fine with this
being addressed with an incremental patch instead of respun:
> diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
> index e8c7000..97fa7f3 100644
> --- a/arch/arm64/kernel/setup.c
> +++ b/arch/arm64/kernel/setup.c
> @@ -390,10 +390,12 @@ void __init setup_arch(char **cmdline_p)
>
> early_ioremap_reset();
>
> - if (acpi_disabled)
> + if (acpi_disabled) {
> unflatten_device_tree();
> -
> - psci_init();
> + psci_dt_init();
> + } else {
> + psci_acpi_init();
> + }
I would prefer having a common psci_init() in psci.c, which in turn calls
either the dt or the acpi version, and after that calls the set_functions
if the init function passed -- it'll keep more code common as new versions
of PSCI is added.
It also keeps setup_arch() somewhat cleaner, and avoids bubbling up the
dt-vs-acpi differences to the top level.
-Olof
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