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-rw-r--r--src/soc/intel/skylake/bootblock/uart.c15
1 files changed, 10 insertions, 5 deletions
diff --git a/src/soc/intel/skylake/bootblock/uart.c b/src/soc/intel/skylake/bootblock/uart.c
index b7ab241f77..f6e7e13b8e 100644
--- a/src/soc/intel/skylake/bootblock/uart.c
+++ b/src/soc/intel/skylake/bootblock/uart.c
@@ -27,9 +27,7 @@
/* Serial IO UART controller legacy mode */
#define PCR_SERIAL_IO_GPPRVRW7 0x618
-#define PCR_SIO_PCH_LEGACY_UART0 (1 << 0)
-#define PCR_SIO_PCH_LEGACY_UART1 (1 << 1)
-#define PCR_SIO_PCH_LEGACY_UART2 (1 << 2)
+#define PCR_SIO_PCH_LEGACY_UART(idx) (1 << (idx))
/* UART2 pad configuration. Support RXD and TXD for now. */
static const struct pad_config uart2_pads[] = {
@@ -44,9 +42,16 @@ void pch_uart_init(void)
uart_common_init(PCH_DEV_UART2, base);
/* Put UART2 in byte access mode for 16550 compatibility */
- if (!IS_ENABLED(CONFIG_DRIVERS_UART_8250MEM_32))
+ if (!IS_ENABLED(CONFIG_DRIVERS_UART_8250MEM_32)) {
pcr_write32(PID_SERIALIO, PCR_SERIAL_IO_GPPRVRW7,
- PCR_SIO_PCH_LEGACY_UART2);
+ PCR_SIO_PCH_LEGACY_UART(CONFIG_UART_FOR_CONSOLE));
+
+ /*
+ * Dummy read after setting any of GPPRVRW7.
+ * Required for UART 16550 8-bit Legacy mode to become active
+ */
+ lpss_clk_read(base);
+ }
gpio_configure_pads(uart2_pads, ARRAY_SIZE(uart2_pads));
}