On 8/31/20 5:13 PM, Jeremy Linton wrote:
Hi,
On 8/31/20 8:15 AM, Pete Batard wrote:
One general, non-blocking comment below:
On 2020.08.28 23:02, Jeremy Linton wrote:
Rather than exporting the temp sensor or mailbox
in ACPI land we can wrap them in AML and use the default
ACPI drivers provided by the OS. This enables the use of
"sensors" in linux to report the SOC temp.
As a first pass add a basic passive cooling ACPI thermalzone
with trip points for passive cooling (throttling) handled
by the vc firmware, hibernate and critical shutdown. The
vc apparently kicks in at ~80C, so the hibernate and critical
set points are set at +5 and +10 of that. In the future
CPPC should be able to monitor the thermal throttling.
Cc: Leif Lindholm <l...@nuviainc.com>
Cc: Pete Batard <p...@akeo.ie>
Cc: Andrei Warkentin <awarken...@vmware.com>
Cc: Ard Biesheuvel <ard.biesheu...@arm.com>
Cc: Samer El-Haj-Mahmoud <samer.el-haj-mahm...@arm.com>
Signed-off-by: Jeremy Linton <jeremy.lin...@arm.com>
Reviewed-by: Pete Batard <@pbatard>
---
Platform/RaspberryPi/AcpiTables/Dsdt.asl | 31
++++++++++++++++++++++
.../Bcm27xx/Include/IndustryStandard/Bcm2711.h | 2 ++
2 files changed, 33 insertions(+)
diff --git a/Platform/RaspberryPi/AcpiTables/Dsdt.asl
b/Platform/RaspberryPi/AcpiTables/Dsdt.asl
index 353af2d876..73067aefd2 100644
--- a/Platform/RaspberryPi/AcpiTables/Dsdt.asl
+++ b/Platform/RaspberryPi/AcpiTables/Dsdt.asl
@@ -252,6 +252,37 @@ DefinitionBlock ("Dsdt.aml", "DSDT", 5,
"RPIFDN", "RPI", 2)
}
})
}
+
+ // Define a simple thermal zone. The idea here is we compute the
SOC temp
+ // via a register we can read, and give it to the OS. This
enables basic
+ // reports from the "sensors" utility, and the OS can then poll
and take
+ // actions if that temp exceeds any of the given thresholds.
+ Device (EC0)
Just going to point out that all the other ACPI devices we seem to
define have 4 characters, so I'm not sure if we're breaking a
convention by introducing a 3 character one here...
Well not an ACPI spec convention, because it seems the spec examples are
mostly 3 characters. EDK2 OTOH, seems to be largely 4 but there are a
fair number of 3 character device/etc methods around
I'm not sure it matters, unless there is a edk2 convention I'm unaware of.
I don't think such a convention exists, although I never tried the MS
iasl compiler, and the RPi asl code (which was contributed by MS)
suspiciously uses 4 letter identifiers everywhere.
Samer, any clue?
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