soc/intel/jasperlake: CNVi: Enable fewer wakeups to reduce SoC power consumption

According to Intel TA#724456, work around the higher SoC power
consumption in S0iX when CNVI has background activity.

BUG=b:201263040
TEST=Turn on this setting and build and verify on Drawcia.
     The SLP_S0 toggling become slower or gone at the same CNVI
     background activity.

Change-Id: I56439a406547e2ee1e47d34be14ecc9a8df04693
Signed-off-by: Jamie Chen <jamie.chen@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63675
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/jasperlake/chip.h

@@ -421,6 +421,19 @@ struct soc_intel_jasperlake_config {
 		CD_CLOCK_652_8_MHZ = 9,
 	} cd_clock;
 
+	/*
+	 * This is a workaround to mitigate higher SoC power consumption in S0ix
+	 * when the CNVI has background activity.
+	 *
+	 * Setting this on a system that supports S0i3 (set xtalsdqdis [Bit 22] in
+	 * cppmvric1 register to 0) will break CNVI timing.
+	 * Affected Intel wireless chipsets: AC9560 (JfP2), AC9461/AC9462 (JfP1) and
+	 * AX201 (HrP2)
+	 *
+	 * true: Enabled (fewer wakes, lower power)
+	 * false: Disabled (more wakes, higher power)
+	 */
+	bool cnvi_reduce_s0ix_pwr_usage;
 };
 
 typedef struct soc_intel_jasperlake_config config_t;

src/soc/intel/jasperlake/finalize.c

@@ -59,6 +59,11 @@ static void pch_finalize(void)
 		reg32 = read32(pmcbase + CPPMVRIC3);
 		reg32 &= ~USBSUSPGQDIS;
 		write32(pmcbase + CPPMVRIC3, reg32);
+
+		if (config->cnvi_reduce_s0ix_pwr_usage) {
+			setbits32(pmcbase + CPPMVRIC2, CNVIVNNAONREQQDIS);
+			setbits32(pmcbase + CORE_SPARE_GCR_0, BIT(0));
+		}
 	}
 
 	pch_handle_sideband(config);

src/soc/intel/jasperlake/include/soc/pmc.h

@@ -121,9 +121,14 @@
 
 #define SLP_S0_RES			0x193c
 
+#define CORE_SPARE_GCR_0		0x195C
+
 #define CPPMVRIC			0x1B1C
 #define   XTALSDQDIS			(1 << 22)
 
+#define CPPMVRIC2			0x1B4C
+#define   CNVIVNNAONREQQDIS		(1 << 26)
+
 #define CPPMVRIC3			0x1E4C
 #define   USBSUSPGQDIS			(1 << 15)