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| author | Michal Simek <michal.simek@xilinx.com> | 2018-06-14 10:41:35 +0200 |
|---|---|---|
| committer | Michal Simek <michal.simek@xilinx.com> | 2018-06-15 08:54:05 +0200 |
| commit | a673025535ae6b559be9badb9fd4c2c9e692b880 (patch) | |
| tree | 4d166fbb52f04218d26c28c73d8320a2046f28fc /drivers/serial/serial_zynq.c | |
| parent | e90d2659e46ab9483c24e08611c06922a8ec25d4 (diff) | |
| download | u-boot-a673025535ae6b559be9badb9fd4c2c9e692b880.tar.gz | |
serial: zynq: Initialize uart only before relocation
This issue was found when OF_LIVE was enabled that there are scrambled
chars on the console like this:
Chip ID: zu3eg
Watchdog: Started��j� sdhci@ff160000: 0, sdhci@ff170000: 1
In: serial@ff010000
I found a solution for this problem exactly the same as I found later in
serial_msm fixed by:
"serial: serial_msm: initialize uart only before relocation"
(sha1: 7e5ad796bcd65772a87da236ae21cd536ae3a4d2)
What it is happening is that output TX fifo still contains chars to be
sent and _uart_zynq_serial_init() resets TX fifo even in the middle of
transfer.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers/serial/serial_zynq.c')
| -rw-r--r-- | drivers/serial/serial_zynq.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/serial/serial_zynq.c b/drivers/serial/serial_zynq.c index 4ae24939ab..cc14bfa39c 100644 --- a/drivers/serial/serial_zynq.c +++ b/drivers/serial/serial_zynq.c @@ -15,6 +15,8 @@ #include <linux/compiler.h> #include <serial.h> +DECLARE_GLOBAL_DATA_PTR; + #define ZYNQ_UART_SR_TXACTIVE BIT(11) /* TX active */ #define ZYNQ_UART_SR_TXFULL BIT(4) /* TX FIFO full */ #define ZYNQ_UART_SR_RXEMPTY BIT(1) /* RX FIFO empty */ @@ -137,6 +139,10 @@ static int zynq_serial_probe(struct udevice *dev) { struct zynq_uart_priv *priv = dev_get_priv(dev); + /* No need to reinitialize the UART after relocation */ + if (gd->flags & GD_FLG_RELOC) + return 0; + _uart_zynq_serial_init(priv->regs); return 0; |