Merge tag 'u-boot-imx-20220919' of https://gitlab.denx.de/u-boot/custodians/u-boot-imx

u-boot-imx-20220919
-------------------

CI: https://source.denx.de/u-boot/custodians/u-boot-imx/-/pipelines/13500

- Fix imx8mn-beacon-kit-u-boot
- Merged Purism
- imxrt1170 (already merged in u-boot-imx)
- Fixes in crypto FSL
- Toradex : fixes Verdin
- Serial Driver: fixes when not used as console
- DH Boards : fixes + USB
- Fix CONFIG_SYS_MALLOC_F_LEN (Kconfig)
- Add imx6ulz_smm_m2

1 files changed, 14 insertions, 1 deletions

diff --git a/drivers/serial/serial_mxc.c b/drivers/serial/serial_mxc.c
index 70a0e5e9197..af1fd1ea9bc 100644
--- a/drivers/serial/serial_mxc.c
+++ b/drivers/serial/serial_mxc.c
@@ -61,6 +61,11 @@
 #define UCR3_AWAKEN	(1<<4)  /* Async wake interrupt enable */
 #define UCR3_REF25	(1<<3)  /* Ref freq 25 MHz */
 #define UCR3_REF30	(1<<2)  /* Ref Freq 30 MHz */
+
+/* imx8 names these bitsfields instead: */
+#define UCR3_DTRDEN	BIT(3)  /* bit not used in this chip */
+#define UCR3_RXDMUXSEL	BIT(2)  /* RXD muxed input selected; 'should always be set' */
+
 #define UCR3_INVT	(1<<1)  /* Inverted Infrared transmission */
 #define UCR3_BPEN	(1<<0)  /* Preset registers enable */
 #define UCR4_CTSTL_32	(32<<10) /* CTS trigger level (32 chars) */
@@ -176,6 +181,14 @@ static void _mxc_serial_setbrg(struct mxc_uart *base, unsigned long clk,
 
 	writel(UCR2_WS | UCR2_IRTS | UCR2_RXEN | UCR2_TXEN | UCR2_SRST,
 	       &base->cr2);
+
+	/*
+	 * setting the baudrate triggers a reset, returning cr3 to its
+	 * reset value but UCR3_RXDMUXSEL "should always be set."
+	 * according to the imx8 reference-manual
+	 */
+	writel(readl(&base->cr3) | UCR3_RXDMUXSEL, &base->cr3);
+
 	writel(UCR1_UARTEN, &base->cr1);
 }
 
@@ -298,7 +311,7 @@ static int mxc_serial_putc(struct udevice *dev, const char ch)
 	struct mxc_serial_plat *plat = dev_get_plat(dev);
 	struct mxc_uart *const uart = plat->reg;
 
-	if (!(readl(&uart->ts) & UTS_TXEMPTY))
+	if (readl(&uart->ts) & UTS_TXFULL)
 		return -EAGAIN;
 
 	writel(ch, &uart->txd);