diff mbox series

[v2,4/4] serial: 8250_dw: Add Allwinner A733 UART

Message ID a3505ad8e74a08faa270881f0efbfe0d0d82d6e0.1792439398.git.vinicius.eduardo.pedrosa@gmail.com (mailing list archive)
State New
Headers
Series serial: 8250_dw: Allwinner A733 UART support |

Commit Message

Vinicius Pedrosa Oct. 19, 2026, 8:06 p.m. UTC 
On the A733, dw8250_set_termios() stops the UART clock around
clk_set_rate() on every termios change that reaches the driver. If TX is
active at that moment, the character being shifted out is corrupted.

No baud rate change is required to trigger the problem. Toggling only
CLOCAL or CSTOPB 300 times during continuous console output corrupted
bytes in every run without the quirk and in none with it.

Use the existing SKIP_SET_RATE quirk, as the JH7100 and SG2044 UARTs do.

Signed-off-by: Vinicius Pedrosa <vinicius.eduardo.pedrosa@gmail.com>
---
 drivers/tty/serial/8250/8250_dw.c | 1 +
 1 file changed, 1 insertion(+)
diff mbox series

Patch

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index 4c86aaf9c121..718ec44135e4 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -906,6 +906,7 @@  static const struct dw8250_platform_data dw8250_tda54 = {
 
 static const struct of_device_id dw8250_of_match[] = {
 	{ .compatible = "snps,dw-apb-uart", .data = &dw8250_dw_apb },
+	{ .compatible = "allwinner,sun60i-a733-uart", .data = &dw8250_skip_set_rate_data },
 	{ .compatible = "cavium,octeon-3860-uart", .data = &dw8250_octeon_3860_data },
 	{ .compatible = "marvell,armada-38x-uart", .data = &dw8250_armada_38x_data },
 	{ .compatible = "renesas,rzn1-uart", .data = &dw8250_renesas_rzn1_data },