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-rw-r--r--src/soc/intel/apollolake/include/soc/spi.h9
-rw-r--r--src/soc/intel/apollolake/spi.c5
2 files changed, 10 insertions, 4 deletions
diff --git a/src/soc/intel/apollolake/include/soc/spi.h b/src/soc/intel/apollolake/include/soc/spi.h
index 20e78d7843..cc508e1b67 100644
--- a/src/soc/intel/apollolake/include/soc/spi.h
+++ b/src/soc/intel/apollolake/include/soc/spi.h
@@ -19,14 +19,15 @@
/* PCI configuration registers */
#define SPIBAR_BIOS_CONTROL 0xdc
+/* Bit definitions for BIOS_CONTROL */
+#define SPIBAR_BIOS_CONTROL_WPD (1 << 0)
+#define SPIBAR_BIOS_CONTROL_CACHE_DISABLE (1 << 2)
+#define SPIBAR_BIOS_CONTROL_PREFETCH_ENABLE (1 << 3)
+#define SPIBAR_BIOS_CONTROL_EISS (1 << 5)
/* Maximum bytes of data that can fit in FDATAn registers */
#define SPIBAR_FDATA_FIFO_SIZE 0x40
-/* Bit definitions for BIOS_CONTROL */
-#define SPIBAR_BIOS_CONTROL_WPD (1 << 0)
-#define SPIBAR_BIOS_CONTROL_EISS (1 << 5)
-
/* Register offsets from the MMIO region base (PCI_BASE_ADDRESS_0) */
#define SPIBAR_BIOS_BFPREG 0x00
#define SPIBAR_HSFSTS_CTL 0x04
diff --git a/src/soc/intel/apollolake/spi.c b/src/soc/intel/apollolake/spi.c
index 282ed013a6..7b390bb2b9 100644
--- a/src/soc/intel/apollolake/spi.c
+++ b/src/soc/intel/apollolake/spi.c
@@ -203,6 +203,11 @@ void spi_init(void)
bios_ctl = pci_read_config32(ctx->pci_dev, SPIBAR_BIOS_CONTROL);
bios_ctl |= SPIBAR_BIOS_CONTROL_WPD;
bios_ctl &= ~SPIBAR_BIOS_CONTROL_EISS;
+
+ /* Enable Prefetching and caching. */
+ bios_ctl |= SPIBAR_BIOS_CONTROL_PREFETCH_ENABLE;
+ bios_ctl &= ~SPIBAR_BIOS_CONTROL_CACHE_DISABLE;
+
pci_write_config32(ctx->pci_dev, SPIBAR_BIOS_CONTROL, bios_ctl);
}