> -----Original Message-----
> From: Robert Hodaszi <robert.hodaszi@xxxxxxxx>
> Sent: 2023年6月8日 17:36
> To: Sherry Sun <sherry.sun@xxxxxxx>; gregkh@xxxxxxxxxxxxxxxxxxx;
> jirislaby@xxxxxxxxxx; linux-serial@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH] Revert "tty: serial: fsl_lpuart: Fix the wrong RXWATER
> setting for rx dma case"
>
> On 2023. 06. 08. 4:20, Sherry Sun wrote:
> > Hi Robert,
> > I understand your concern, fortunately, LPUART IP provides the Receiver
> Idle Empty function, which can avoid the receive data being trapped in the RX
> FIFO. For more details you can check my patch below.
> >
> Hi,
>
> Although I can see RXIDEN in the i.MX8 RM, it's not in LS1028A's LPUART FIFO
> register. Seems not all LPUART IPs have this.
>
Oh, maybe LS1028 use the old IP version LPUART.
If this is the case, I suggest that you can set the rx_watermark of ls1028 to 0.
static const struct lpuart_soc_data ls1028a_data = {
.devtype = LS1028A_LPUART,
.iotype = UPIO_MEM32,
.rx_watermark = 0,
};
Best Regards
Sherry
