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serial: 8250_pxa: Configure tx_loadsz to match FIFO IRQ level

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The FIFO is 64 bytes, but the FCR is configured to fire the TX interrupt
when the FIFO is half empty (bit 3 = 0). Thus, we should only write 32
bytes when a TX interrupt occurs.

This fixes a problem observed on the PXA168 that dropped a bunch of TX
bytes during large transmissions.

Fixes: ab28f51c77cd ("serial: rewrite pxa2xx-uart to use 8250_core")
Signed-off-by: Doug Brown <doug@schmorgal.com>
Link: https://lore.kernel.org/r/20240519191929.122202-1-doug@schmorgal.com
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Doug Brown 2024-05-19 12:19:30 -07:00 committed by Greg Kroah-Hartman
parent 2c94512055
commit 5208e7ced5
1 changed files with 1 additions and 0 deletions
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drivers/tty/serial/8250/8250_pxa.c
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@ -125,6 +125,7 @@ static int serial_pxa_probe(struct platform_device *pdev)
uart.port.iotype = UPIO_MEM32;
uart.port.regshift = 2;
uart.port.fifosize = 64;
uart.tx_loadsz = 32;
uart.dl_write = serial_pxa_dl_write;
ret = serial8250_register_8250_port(&uart);