soc/intel/cannonlake: Set correct serirq mode

Set FSP params PchSirqEnable/PchSirqMode based on board
setting of serirq_mode. Matches implementation on Skylake.

This is a no-change for existing boards since the default
remains SERIRQ_QUIET mode.

Tested on system76 galp3-c, out-of-tree WHL-U board

Change-Id: I9ad4f5a6c7391fc6e813ec1306c708f449a69f59
Signed-off-by: Jeremy Soller <jeremy@system76.com>
Signed-off-by: Matt DeVillier <matt.devillier@puri.sm>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31536
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Nathaniel L Desimone <nathaniel.l.desimone@intel.com>

src/soc/intel/cannonlake/chip.h

@@ -22,6 +22,7 @@
 #include <drivers/i2c/designware/dw_i2c.h>
 #include <intelblocks/gpio.h>
 #include <intelblocks/gspi.h>
+#include <intelblocks/lpc_lib.h>
 #include <smbios.h>
 #include <stdint.h>
 #include <soc/gpio.h>
@@ -360,6 +361,8 @@ struct soc_intel_cannonlake_config {
 	 */
 	uint8_t SerialIoDevMode[PchSerialIoIndexMAX];
 
+	enum serirq_mode serirq_mode;
+
 	/* GPIO SD card detect pin */
 	unsigned int sdcard_cd_gpio;
 

src/soc/intel/cannonlake/fsp_params.c

@@ -416,6 +416,10 @@ void platform_fsp_silicon_init_params_cb(FSPS_UPD *supd)
 	/* Unlock all GPIO pads */
 	tconfig->PchUnlockGpioPads = config->PchUnlockGpioPads;
 
+	/* Set correct Sirq mode based on config */
+	params->PchSirqEnable = config->serirq_mode != SERIRQ_OFF;
+	params->PchSirqMode = config->serirq_mode == SERIRQ_CONTINUOUS;
+
 	/*
 	 * GSPI Chip Select parameters
 	 * The GSPI driver assumes that CS0 is the used chip-select line,

src/soc/intel/cannonlake/lpc.c

@@ -210,6 +210,8 @@ static void pch_misc_init(void)
 
 void lpc_soc_init(struct device *dev)
 {
+	const config_t *config = dev->chip_info;
+
 	/* Legacy initialization */
 	isa_dma_init();
 	pch_misc_init();
@@ -218,10 +220,7 @@ void lpc_soc_init(struct device *dev)
 	lpc_enable_pci_clk_cntl();
 
 	/* Set LPC Serial IRQ mode */
-	if (CONFIG(SERIRQ_CONTINUOUS_MODE))
+	lpc_set_serirq_mode(config->serirq_mode);
-		lpc_set_serirq_mode(SERIRQ_CONTINUOUS);
-	else
-		lpc_set_serirq_mode(SERIRQ_QUIET);
 
 	/* Interrupt configuration */
 	pch_enable_ioapic(dev);