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ACPI: SPCR: Make SPCR available to x86

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

7
drivers/acpi/Kconfig
View file

@ -79,7 +79,12 @@ config ACPI_DEBUGGER_USER
endif
config ACPI_SPCR_TABLE
bool
bool "ACPI Serial Port Console Redirection Support"
default y if X86
help
Enable support for Serial Port Console Redirection (SPCR) Table.
This table provides information about the configuration of the
earlycon console.
config ACPI_LPIT
bool

29
drivers/acpi/spcr.c
View file

@ -21,7 +21,7 @@
* occasionally getting stuck as 1. To avoid the potential for a hang, check
* TXFE == 0 instead of BUSY == 1. This may not be suitable for all UART
* implementations, so only do so if an affected platform is detected in
* parse_spcr().
* acpi_parse_spcr().
*/
bool qdf2400_e44_present;
EXPORT_SYMBOL(qdf2400_e44_present);
@ -74,19 +74,21 @@ static bool xgene_8250_erratum_present(struct acpi_table_spcr *tb)
}
/**
* parse_spcr() - parse ACPI SPCR table and add preferred console
* acpi_parse_spcr() - parse ACPI SPCR table and add preferred console
*
* @earlycon: set up earlycon for the console specified by the table
* @enable_earlycon: set up earlycon for the console specified by the table
* @enable_console: setup the console specified by the table.
*
* For the architectures with support for ACPI, CONFIG_ACPI_SPCR_TABLE may be
* defined to parse ACPI SPCR table. As a result of the parsing preferred
* console is registered and if @earlycon is true, earlycon is set up.
* console is registered and if @enable_earlycon is true, earlycon is set up.
* If @enable_console is true the system console is also configured.
*
* When CONFIG_ACPI_SPCR_TABLE is defined, this function should be called
* from arch initialization code as soon as the DT/ACPI decision is made.
*
*/
int __init parse_spcr(bool earlycon)
int __init acpi_parse_spcr(bool enable_earlycon, bool enable_console)
{
static char opts[64];
struct acpi_table_spcr *table;
@ -105,11 +107,8 @@ int __init parse_spcr(bool earlycon)
if (ACPI_FAILURE(status))
return -ENOENT;
if (table->header.revision < 2) {
err = -ENOENT;
pr_err("wrong table version\n");
goto done;
}
if (table->header.revision < 2)
pr_info("SPCR table version %d\n", table->header.revision);
if (table->serial_port.space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) {
switch (ACPI_ACCESS_BIT_WIDTH((
@ -185,7 +184,7 @@ int __init parse_spcr(bool earlycon)
*/
if (qdf2400_erratum_44_present(&table->header)) {
qdf2400_e44_present = true;
if (earlycon)
if (enable_earlycon)
uart = "qdf2400_e44";
}
@ -205,11 +204,13 @@ int __init parse_spcr(bool earlycon)
pr_info("console: %s\n", opts);
if (earlycon)
if (enable_earlycon)
setup_earlycon(opts);
err = add_preferred_console(uart, 0, opts + strlen(uart) + 1);
if (enable_console)
err = add_preferred_console(uart, 0, opts + strlen(uart) + 1);
else
err = 0;
done:
acpi_put_table((struct acpi_table_header *)table);
return err;