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ACPI: SPCR: Make SPCR available to x86

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SPCR is currently only enabled or ARM64 and x86 can use SPCR to setup
an early console.

General fixes include updating Documentation & Kconfig (for x86),
updating comments, and changing parse_spcr() to acpi_parse_spcr(),
and earlycon_init_is_deferred to earlycon_acpi_spcr_enable to be
more descriptive.

On x86, many systems have a valid SPCR table but the table version is
not 2 so the table version check must be a warning.

On ARM64 when the kernel parameter earlycon is used both the early console
and console are enabled.  On x86, only the earlycon should be enabled by
by default.  Modify acpi_parse_spcr() to allow options for initializing
the early console and console separately.

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Mark Salter <msalter@redhat.com>
Tested-by: Mark Salter <msalter@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Prarit Bhargava
2018-01-18 10:09:51 -05:00
committed by Rafael J. Wysocki
parent 890674343b
commit 0231d00082
8 changed files with 44 additions and 34 deletions
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4
include/linux/serial_core.h
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@@ -376,10 +376,10 @@ extern int of_setup_earlycon(const struct earlycon_id *match,
const char *options);
#ifdef CONFIG_SERIAL_EARLYCON
extern bool earlycon_init_is_deferred __initdata;
extern bool earlycon_acpi_spcr_enable __initdata;
int setup_earlycon(char *buf);
#else
static const bool earlycon_init_is_deferred;
static const bool earlycon_acpi_spcr_enable;
static inline int setup_earlycon(char *buf) { return 0; }
#endif