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authorAngel Pons <th3fanbus@gmail.com>2021-01-22 15:12:14 +0100
committerPatrick Georgi <pgeorgi@google.com>2021-01-25 08:50:17 +0000
commite4abe7fd5afcf35db8ac51969f716592f4bdf253 (patch)
tree6e8b8a4f1b2d62f213f9b5652ec80a547e7831a7 /src/drivers/generic
parentf06d046c1041477adbd6e40a038667a620641b38 (diff)
downloadcoreboot-e4abe7fd5afcf35db8ac51969f716592f4bdf253.tar.xz
bayhub bh720: Configure VIH tuning via devicetree
There's no need to repeat the same code on every board. Change-Id: I2e19decfe8609fa644e609673a56ee5109bafefa Signed-off-by: Angel Pons <th3fanbus@gmail.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/49831 Reviewed-by: EricR Lai <ericr_lai@compal.corp-partner.google.com> Reviewed-by: Raul Rangel <rrangel@chromium.org> Reviewed-by: Martin Roth <martinroth@google.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/drivers/generic')
-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;
};