linux-toradex.git/drivers/acpi/spcr.c, branch v4.16-rc6

ACPI: SPCR: Mark expected switch fall-through in acpi_parse_spcr

2018-02-12T09:31:26+00:00

In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.

Addresses-Coverity-ID: 1465078
Signed-off-by: Gustavo A. R. Silva 
Signed-off-by: Rafael J. Wysocki

ACPI: SPCR: Make SPCR available to x86

2018-02-07T10:39:58+00:00

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 
Acked-by: Ingo Molnar 
Reviewed-by: Mark Salter 
Tested-by: Mark Salter 
Signed-off-by: Rafael J. Wysocki

Merge branches 'acpi-video', 'acpi-battery', 'acpi-spcr' and 'acpi-misc'

2017-09-03T21:54:29+00:00

* acpi-video:
  ACPI / video: Add force_none quirk for Dell OptiPlex 9020M

* acpi-battery:
  ACPI: make device_attribute const

* acpi-spcr:
  ACPI: SPCR: work around clock issue on xgene UART
  ACPI: SPCR: extend XGENE 8250 workaround to m400

* acpi-misc:
  ACPI / dock: constify attribute_group structure
  MAINTAINERS: Add Tony and Boris as ACPI/APEI reviewers
  ACPI / lpat: Fix typos in comments and kerneldoc style
  MAINTAINERS: device property: ACPI: add fwnode.h

Merge branch 'acpica'

2017-09-03T21:53:05+00:00

* acpica: (32 commits)
  ACPICA: Update version to 20170728
  ACPICA: Revert "Update resource descriptor handling"
  ACPICA: Resources: Allow _DMA method in walk resources
  ACPICA: Ensure all instances of AE_AML_INTERNAL have error messages
  ACPICA: Implement deferred resolution of reference package elements
  ACPICA: Debugger: Improve support for Alias objects
  ACPICA: Interpreter: Update handling for Alias operator
  ACPICA: EFI/EDK2: Cleanup to enable /WX for MSVC builds
  ACPICA: acpidump: Add DSDT/FACS instance support for Linux and EFI
  ACPICA: CLib: Add short multiply/shift support
  ACPICA: EFI/EDK2: Sort acpi.h inclusion order
  ACPICA: Add a comment, no functional change
  ACPICA: Namespace: Update/fix an error message
  ACPICA: iASL: Add support for the SDEI table
  ACPICA: Divergences: reduce access size definitions
  ACPICA: Update version to 20170629
  ACPICA: Update resource descriptor handling
  ACPICA: iasl: Update to IORT SMMUv3 disassembling
  ACPICA: Disassembler: skip parsing of incorrect external declarations
  ACPICA: iASL: Ensure that the target node is valid in acpi_ex_create_alias
  ...

ACPI: SPCR: work around clock issue on xgene UART

2017-08-16T16:16:46+00:00

xgene v1/v2 8250 UARTs don't run at the standard clock rate expected by
the driver and there is no information on clocking available from the
SPCR table. As there has been no progress on relevant vendors updating
DBG2/SPCR specifications to fix this work around this using the previous
xgene quirk handling to avoid setting a baud rate and therefore using
the UART as configured by firmware.

Signed-off-by: Graeme Gregory 
Tested-by: Mark Salter 
Reviewed-by: Mark Salter 
Signed-off-by: Rafael J. Wysocki

ACPI: SPCR: extend XGENE 8250 workaround to m400

2017-08-15T12:17:08+00:00

xgene v1/v2 chips are also used on moonshot cartridges that have
different table headers to the ones on Mustang. Extend the quirk
so it also recognises the Moonshot M400 variant too.

Signed-off-by: Graeme Gregory 
Tested-by: Mark Salter 
Reviewed-by: Mark Salter 
Signed-off-by: Rafael J. Wysocki

ACPICA: Divergences: reduce access size definitions

2017-08-03T21:34:15+00:00

ACPICA commit cf27b3c98883d2a15d932016792fcb8272ace96d

The following commit introduces definition of access width to ACPICA.
  Commit: 2bece49394872d36bbc5767fd643deac05920c55
  Subject: ACPI: SPCR: Use access width to determine mmio usage

Actually the access bit width can be calculated via access width. It
would be better to define a macro calculating bit width rather than
defining fixed values. This patch thus cleans up the definitions to
reduce divergences.

Link: https://github.com/acpica/acpica/commit/cf27b3c9
Signed-off-by: Lv Zheng 
Signed-off-by: Rafael J. Wysocki

tty: pl011: fix initialization order of QDF2400 E44

2017-07-30T14:53:44+00:00

The work-around for Qualcomm Technologies QDF2400 Erratum 44 hinges on a
global variable defined in the pl011 driver.  The ACPI SPCR parsing code
determines whether the work-around is needed, and if so, it changes the
console name from "pl011" to "qdf2400_e44".  The expectation is that
the pl011 driver will implement the work-around when it sees the console
name.  The global variable qdf2400_e44_present is set when that happens.

The problem is that work-around needs to be enabled when the pl011
driver probes, not when the console name is queried.  However, sbsa_probe()
is called before pl011_console_match().  The work-around appeared to work
previously because the default console on QDF2400 platforms was always
ttyAMA1.  The first time sbsa_probe() is called (for ttyAMA0),
qdf2400_e44_present is still false.  Then pl011_console_match() is called,
and it sets qdf2400_e44_present to true.  All subsequent calls to
sbsa_probe() enable the work-around.

The solution is to move the global variable into spcr.c and let the
pl011 driver query it during probe time.  This works because all QDF2400
platforms require SPCR, so parse_spcr() will always be called.
pl011_console_match still checks for the "qdf2400_e44" console name,
but it doesn't do anything else special.

Fixes: 5a0722b898f8 ("tty: pl011: use "qdf2400_e44" as the earlycon name for QDF2400 E44")
Tested-by: Jeffrey Hugo 
Signed-off-by: Timur Tabi 
Signed-off-by: Greg Kroah-Hartman

ACPI: SPCR: Workaround for APM X-Gene 8250 UART 32-alignment errata

2017-07-04T19:29:38+00:00

APM X-Gene verion 1 and 2 have an 8250 UART with its register
aligned to 32-bit. In addition, the latest released BIOS
encodes the access field as 8-bit access instead 32-bit access.
This causes no console with ACPI boot as the console
will not match X-Gene UART port due to the lack of mmio32
option.

Signed-off-by: Loc Ho 
Acked-by: Greg Kroah-Hartman 
Signed-off-by: Rafael J. Wysocki

ACPI: SPCR: Use access width to determine mmio usage

2017-07-04T19:29:38+00:00

The current SPCR code does not check the access width of the MMIO, and
uses a default of 8bit register accesses.  This prevents devices that
only do 16 or 32bit register accesses from working.  By simply checking
this field and setting the MMIO string appropriately, this issue can be
corrected.  To prevent any legacy issues, the code will default to 8bit
accesses if the value is anything but 16 or 32.

Signed-off-by: Jon Mason 
Signed-off-by: Loc Ho 
Acked-by: Greg Kroah-Hartman 
Signed-off-by: Rafael J. Wysocki