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| author | Prarit Bhargava <prarit@redhat.com> | 2018-01-18 10:09:51 -0500 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2018-02-07 11:39:58 +0100 |
| commit | 0231d00082f61cfe03f2b7c27e5356f8cdf0312c (patch) | |
| tree | 24f036cb972640ccdeed395a55d1c37571fcb3db /drivers/tty | |
| parent | 890674343bb2d546825f713542b1e199f0728732 (diff) | |
| download | linux-0231d00082f61cfe03f2b7c27e5356f8cdf0312c.tar.gz linux-0231d00082f61cfe03f2b7c27e5356f8cdf0312c.tar.bz2 linux-0231d00082f61cfe03f2b7c27e5356f8cdf0312c.zip | |
ACPI: SPCR: Make SPCR available to x86
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>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/earlycon.c | 15 |
1 files changed, 5 insertions, 10 deletions
diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c index 4c8b80f1c688..870e84fb6e39 100644 --- a/drivers/tty/serial/earlycon.c +++ b/drivers/tty/serial/earlycon.c @@ -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(); |