linux-kernel - Re: [PATCH v5 13/14] serial: liteuart: add IRQ support for the TX path

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Date:   Mon, 21 Nov 2022 09:58:41 +0100
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Gabriel Somlo <gsomlo@...il.com>, linux-kernel@...r.kernel.org
Cc:     linux-serial@...r.kernel.org, gregkh@...uxfoundation.org,
        kgugala@...micro.com, mholenko@...micro.com, joel@....id.au,
        david.abdurachmanov@...il.com, florent@...oy-digital.fr,
        geert@...ux-m68k.org, ilpo.jarvinen@...ux.intel.com
Subject: Re: [PATCH v5 13/14] serial: liteuart: add IRQ support for the TX
 path

On 18. 11. 22, 15:55, Gabriel Somlo wrote:
> Switch the TX path to IRQ-driven operation, while maintaining support
> for polling mode via the poll timer.
> 
> Signed-off-by: Gabriel Somlo <gsomlo@...il.com>
> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
...
> @@ -154,6 +148,8 @@ static irqreturn_t liteuart_interrupt(int irq, void *data)
>   	isr = litex_read8(port->membase + OFF_EV_PENDING) & uart->irq_reg;
>   	if (isr & EV_RX)
>   		liteuart_rx_chars(port);
> +	if (isr & EV_TX)
> +		liteuart_tx_chars(port);

Wait, how do you ensure the OFF_EV_PENDING reg contains EV_RX and/or 
EV_TX in the polling mode?

thanks,
-- 
js
suse labs