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-rw-r--r--src/drivers/generic/bayhub/bh720.c13
-rw-r--r--src/drivers/generic/bayhub/chip.h3
2 files changed, 16 insertions, 0 deletions
diff --git a/src/drivers/generic/bayhub/bh720.c b/src/drivers/generic/bayhub/bh720.c
index cdac9fe35a..24386642eb 100644
--- a/src/drivers/generic/bayhub/bh720.c
+++ b/src/drivers/generic/bayhub/bh720.c
@@ -44,6 +44,19 @@ static void bh720_init(struct device *dev)
}
board_bh720(dev);
+
+ if (config && config->vih_tuning_value) {
+ /* Tune VIH */
+ u32 bh720_pcr_data;
+ pci_write_config32(dev, BH720_PROTECT,
+ BH720_PROTECT_OFF | BH720_PROTECT_LOCK_OFF);
+ bh720_pcr_data = pci_read_config32(dev, BH720_PCR_DrvStrength_PLL);
+ bh720_pcr_data &= 0xFFFFFF00;
+ bh720_pcr_data |= config->vih_tuning_value;
+ pci_write_config32(dev, BH720_PCR_DrvStrength_PLL, bh720_pcr_data);
+ pci_write_config32(dev, BH720_PROTECT,
+ BH720_PROTECT_ON | BH720_PROTECT_LOCK_ON);
+ }
}
static struct device_operations bh720_ops = {
diff --git a/src/drivers/generic/bayhub/chip.h b/src/drivers/generic/bayhub/chip.h
index dacad7cb84..f898378cb4 100644
--- a/src/drivers/generic/bayhub/chip.h
+++ b/src/drivers/generic/bayhub/chip.h
@@ -8,4 +8,7 @@
struct drivers_generic_bayhub_config {
/* 1 to enable power-saving mode, 0 to disable */
int power_saving;
+
+ /* CLK and DAT tuning values */
+ uint8_t vih_tuning_value;
};