Revert "drivers/intel/dptf: Add multiple fan support under dptf"

This reverts commit 672bd9bee5.

Reason for revert: Gmeet resolution dropped. When system starts
Gmeet video call, it uses the hardware accelerated encoder as per
the expectation. But, as soon as another system connects to the call,
the immediate fallback observed from hardware to software encoder.
Due to this, Gmeet resolution dropped from 720p to 180p.
Currently, this issue observed on AlderLake-N SoC based fanless
platforms. This issue is not seen on fan based systems.

BUG=b:246535768,b:235254828
BRANCH=None
TEST=Built and tested on Alderlake-N systems. With this revert
Gmeet resolution drop not observed.

Change-Id: Idaeaeaed47be44166a7cba9a0a1fac50d2688e50
Signed-off-by: Sumeet Pawnikar <sumeet.r.pawnikar@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68568
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Baieswara Reddy Sagili <baieswara.reddy.sagili@intel.com>
Reviewed-by: V Sowmya <v.sowmya@intel.com>

src/ec/google/chromeec/acpi/emem.asl

@@ -16,7 +16,6 @@ TIN8, 8,	// Temperature 8
 TIN9, 8,	// Temperature 9
 Offset (0x10),
 FAN0, 16,	// Fan Speed 0
-FAN1, 16,	// Fan Speed 1
 Offset (0x24),
 BTVR, 8,	// Battery structure version
 Offset (0x30),

src/ec/google/chromeec/chip.h

@@ -12,7 +12,6 @@ struct ec_google_chromeec_config {
 	/* Pointer to PMC Mux connector for each Type-C port */
 	DEVTREE_CONST struct device *mux_conn[MAX_TYPEC_PORTS];
 	DEVTREE_CONST struct device *retimer_conn[MAX_TYPEC_PORTS];
-	bool ec_multifan_support;
 };
 
 #endif /* EC_GOOGLE_CHROMEEC_CHIP_H */

src/ec/google/chromeec/ec_acpi.c

@@ -276,7 +276,7 @@ void google_chromeec_fill_ssdt_generator(const struct device *dev)
 	ec->ops = &ec_ops;
 
 	if (CONFIG(DRIVERS_INTEL_DPTF))
-		ec_fill_dptf_helpers(ec, dev);
+		ec_fill_dptf_helpers(ec);
 
 	fill_ssdt_typec_device(dev);
 	fill_ssdt_ps2_keyboard(dev);

src/ec/google/chromeec/ec_dptf_helpers.c

@@ -3,9 +3,7 @@
 #include <acpi/acpigen.h>
 #include <acpi/acpigen_dptf.h>
 #include <ec/google/common/dptf.h>
-#include <drivers/intel/dptf/chip.h>
 
-#include "chip.h"
 /*
  * The Chrome EC is typically in charge of many system functions, including battery charging and
  * fan PWM control. This places it in the middle of a DPTF implementation and therefore, many of
@@ -24,19 +22,6 @@ enum {
 	EC_FAN_DUTY_AUTO		= 0xFF,
 };
 
-/* Return the fan number as a string for the FAN participant */
-static const char *fan_num_namestring_of(enum dptf_participant participant)
-{
-	switch (participant) {
-	case DPTF_FAN:
-		return "FAN0";
-	case DPTF_FAN_2:
-		return "FAN1";
-	default:
-		return "";
-	}
-}
-
 static void write_charger_PPPC(const struct device *ec)
 {
 	acpigen_write_method_serialized("PPPC", 0);
@@ -106,7 +91,7 @@ static void write_charger_SPPC(const struct device *ec)
 	acpigen_pop_len(); /* Method */
 }
 
-static void write_fan_fst(const struct device *ec, int participant)
+static void write_fan_fst(const struct device *ec)
 {
 	/* TFST is a package that is used to store data from FAND */
 	acpigen_write_name("TFST");
@@ -125,7 +110,7 @@ static void write_fan_fst(const struct device *ec, int participant)
 	acpigen_write_integer(1);
 	acpigen_emit_byte(ZERO_OP); /* 3rd arg to Index */
 	acpigen_write_store();
-	acpigen_emit_namestring(acpi_device_path_join(ec, fan_num_namestring_of(participant)));
+	acpigen_emit_namestring(acpi_device_path_join(ec, "FAN0"));
 	acpigen_emit_byte(INDEX_OP);
 	acpigen_emit_namestring("TFST");
 	acpigen_write_integer(2);
@@ -315,11 +300,11 @@ static void write_charger_methods(const struct device *ec)
 	acpigen_pop_len(); /* Scope */
 }
 
-static void write_fan_methods(const struct device *ec, int participant)
+static void write_fan_methods(const struct device *ec)
 {
-	dptf_write_scope(participant);
+	dptf_write_scope(DPTF_FAN);
 	write_fan_fsl(ec);
-	write_fan_fst(ec, participant);
+	write_fan_fst(ec);
 	acpigen_pop_len(); /* Scope */
 }
 
@@ -367,20 +352,14 @@ static void write_thermal_methods(const struct device *ec, enum dptf_participant
 	acpigen_pop_len(); /* Scope */
 }
 
-void ec_fill_dptf_helpers(const struct device *ec, const struct device *fan_dev)
+void ec_fill_dptf_helpers(const struct device *ec)
 {
 	enum dptf_participant p;
 	int i;
-	struct ec_google_chromeec_config *config = fan_dev->chip_info;
 
 	write_dppm_methods(ec);
 	write_charger_methods(ec);
-
-	if (config->ec_multifan_support) {
-		for (p = DPTF_FAN; p <= DPTF_FAN_2; ++p)
-			write_fan_methods(ec, p);
-	} else
-		write_fan_methods(ec, DPTF_FAN);
+	write_fan_methods(ec);
 
 	for (p = DPTF_TEMP_SENSOR_0, i = 0; p <= DPTF_TEMP_SENSOR_4; ++p, ++i)
 		write_thermal_methods(ec, p, i);

src/ec/google/common/dptf.h

@@ -6,6 +6,6 @@
 #include <device/device.h>
 
 /* Called by google_chromeec_fill_ssdt_generator */
-void ec_fill_dptf_helpers(const struct device *dev, const struct device *fan_dev);
+void ec_fill_dptf_helpers(const struct device *dev);
 
 #endif /* EC_GOOGLE_COMMON_DPTF_H */