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authorMichal Simek <michal.simek@xilinx.com>2015-04-15 13:05:06 +0200
committerMichal Simek <michal.simek@xilinx.com>2015-04-29 11:19:01 +0200
commit04bc5c939a79c796374ffb93251841317ef8cf6f (patch)
tree5fde93d281648bdb65e642d21c7d8e25da7da47b /drivers
parentcaacb33fd1f9c270b0f0c878cfca08b56c0b257c (diff)
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serial: zynq: Add support for slow emulation platform
On slow platforms not all baudrate setting is valid. Check it directly in the driver and setup maximum possible frequency. Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/serial/serial_zynq.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/serial/serial_zynq.c b/drivers/serial/serial_zynq.c
index 3e2b8dc..9278763 100644
--- a/drivers/serial/serial_zynq.c
+++ b/drivers/serial/serial_zynq.c
@@ -48,10 +48,16 @@ static void uart_zynq_serial_setbrg(const int port)
/* Calculation results. */
unsigned int calc_bauderror, bdiv, bgen;
unsigned long calc_baud = 0;
- unsigned long baud = gd->baudrate;
+ unsigned long baud;
unsigned long clock = get_uart_clk(port);
struct uart_zynq *regs = uart_zynq_ports[port];
+ /* Covering case where input clock is so slow */
+ if (clock < 1000000 && gd->baudrate > 4800)
+ gd->baudrate = 4800;
+
+ baud = gd->baudrate;
+
/* master clock
* Baud rate = ------------------
* bgen * (bdiv + 1)