Whitespace/style and typos:
On 2020.08.14 00:00, Jeremy Linton wrote:
Now that we have a thermal zone we can add active cooling
by specifying active cooling points (_ACx) which can
be tied to fan objects that turn fans on/off using GPIO
pins.
Cc: Leif Lindholm
Cc: Pete Batard
Cc: Andrei Warkentin
Cc: Ard Biesheuvel
Cc: Samer El-Haj-Mahmoud
Signed-off-by: Jeremy Linton
---
.../RaspberryPi/Drivers/ConfigDxe/SsdtThermal.asl | 83 ++
1 file changed, 83 insertions(+)
create mode 100644 Platform/RaspberryPi/Drivers/ConfigDxe/SsdtThermal.asl
diff --git a/Platform/RaspberryPi/Drivers/ConfigDxe/SsdtThermal.asl
b/Platform/RaspberryPi/Drivers/ConfigDxe/SsdtThermal.asl
new file mode 100644
index 00..c87bda6dbc
--- /dev/null
+++ b/Platform/RaspberryPi/Drivers/ConfigDxe/SsdtThermal.asl
@@ -0,0 +1,83 @@
+/** @file
+ *
+ * Secondary System Description Table (SSDT) for active (fan) cooling
+ *
+ * Copyright (c) 2020, Arm Ltd. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause-Patent
+ *
+ **/
+
+#include
+#include
+#include
+
+#include
+
+DefinitionBlock(__FILE__, "SSDT", 5, "RPIFDN", "RPITHFAN", 2)
Space before '('
+{
+#if (GPIO_FAN_PIN != 0)
+ External(\_SB_.EC0, DeviceObj)
+ External(\_SB_.EC0.TZ0, DeviceObj)
+
+ Scope (\_SB_.EC0)
3 x Space before '('
+ {
+ // Describe a fan
+ PowerResource(PFAN, 0, 0) {
Space before '('
+OperationRegion (GPIO, SystemMemory, GPIO_BASE_ADDRESS, 0x1000)
+Field (GPIO, DWordAcc, NoLock, Preserve) {
+ Offset(0x1C),
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+ GPS0, 32,
+ GPS1, 32,
+ RES1, 32,
+ GPC0, 32,
+ GPC1, 32,
+ RES2, 32,
+ GPL1, 32,
+ GPL2, 32
+}
+// We are hitting a GPIO pin to on/off the fan
+// this assumes that UEFI has programmed the
+// direction as OUT.
+// (search "rpi gpio fan controller" for how to
+// wire this up if your not electrically inclined
"your" -> "you're"
+// the basic idea is to use a BJT/etc to switch a
+// larger voltage through a fan where the GPIO pin
+// feeds a NPN/PNP base. Thats because its unlikly
"Thats" -> "That's", "unlikly" -> "unlikely"
+// that the fan can be driven directly from the GPIO
+// pin due to hitting the current limit on the pins.
+// Matching a resistor between the GPIO->Base can
+// allow pretty much any random NPN with a reasonable
+// EC current to work (to limit the GPIO current).)
+Method (_STA) {
+ if ( GPL1 & (1 << GPIO_FAN_PIN) ) {
No space between '(' and 'GPL1', as well as between the last 2 ')'
+Return ( 1 ) // present and enabled
No spaces inside the parenthesis
+ }
+ Return ( 0 )
No spaces inside the parenthesis
+}
+Method (_ON) {//turn fan on
+ Store((1 << GPIO_FAN_PIN), GPS0)
Space before '('
+}
+Method (_OFF) {//turn fan off
+ Store((1 << GPIO_FAN_PIN), GPC0)
Space before '('
+}
+ }
+ Device(FAN) {
Space before '('
+// Note, not currently an ACPIv4 fan
+// the latter adds speed control/detection
+// but in the case of linux needs FIF, FPS, FSL, and FST
+Name(_HID, EISAID("PNP0C0B"))
+Name(_PR0, Package() {PFAN})
2 x Space before '(', space after '{' and before '}'
+ }
+ }
+
+ // merge in an active cooling point.
+ Scope (\_SB_.EC0.TZ0)
+ {
+Method(_AC0) { return(3332) }// (60K) active cooling trip point,
Space before '('
+ // if this is lower than PSV then we
+ // prefer active cooling
+Name(_AL0, Package(){\_SB_.EC0.FAN}) // the fan used for AC0 above
Space before '(' for 'Name' and 'Package', space after () of 'Package',
space after '{' and before '}'
+ }
+#endif
+}
Reviewed-by: Pete Batard
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