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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 <[email protected]>
Acked-by: Ingo Molnar <[email protected]>
Reviewed-by: Mark Salter <[email protected]>
Tested-by: Mark Salter <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Prarit Bhargava 2018-01-18 10:09:51 -05:00 • committed by Rafael J. Wysocki
commit 0231d00082
8 changed files with 44 additions and 34 deletions
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15
drivers/tty/serial/earlycon.c
View file

@ -197,25 +197,20 @@ int __init setup_earlycon(char *buf)
}
/*
* When CONFIG_ACPI_SPCR_TABLE is defined, "earlycon" without parameters in
* command line does not start DT earlycon immediately, instead it defers
* starting it until DT/ACPI decision is made. At that time if ACPI is enabled
* call parse_spcr(), else call early_init_dt_scan_chosen_stdout()
* This defers the initialization of the early console until after ACPI has
* been initialized.
*/
bool earlycon_init_is_deferred __initdata;
bool earlycon_acpi_spcr_enable __initdata;
/* early_param wrapper for setup_earlycon() */
static int __init param_setup_earlycon(char *buf)
{
int err;
/*
* Just 'earlycon' is a valid param for devicetree earlycons;
* don't generate a warning from parse_early_params() in that case
*/
/* Just 'earlycon' is a valid param for devicetree and ACPI SPCR. */
if (!buf || !buf[0]) {
if (IS_ENABLED(CONFIG_ACPI_SPCR_TABLE)) {
earlycon_init_is_deferred = true;
earlycon_acpi_spcr_enable = true;
return 0;
} else if (!buf) {
return early_init_dt_scan_chosen_stdout();