linux-kernel - Re: [PATCH v4 08/13] tty: serial: qcom-geni-serial: refactor qcom_geni_serial_handle

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Date:   Wed, 30 Nov 2022 10:35:56 +0100
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Bartosz Golaszewski <brgl@...ev.pl>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Vinod Koul <vkoul@...nel.org>, Alex Elder <elder@...nel.org>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-serial@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v4 08/13] tty: serial: qcom-geni-serial: refactor
 qcom_geni_serial_handle_tx()

On 29. 11. 22, 12:00, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> 
> qcom_geni_serial_handle_tx() is pretty big, let's move the code that
> handles the actual writing of data to a separate function which makes
> sense in preparation for introducing a dma variant of handle_tx().

I think you should split this patch into two. One to extract the code 
^^^. And one to clean it up:

> Let's also shuffle the code a bit, drop unneeded variables and use
> uart_xmit_advance() instead of handling tail->xmit manually.

As it is, it's hard to follow what is being changed.


...
> @@ -704,19 +704,41 @@ static void qcom_geni_serial_start_rx(struct uart_port *uport)
>   	writel(irq_en, uport->membase + SE_GENI_M_IRQ_EN);
>   }
>   
> +static void qcom_geni_serial_send_chunk_fifo(struct uart_port *uport,
> +					     unsigned int chunk)
> +{
> +	struct qcom_geni_serial_port *port = to_dev_port(uport);
> +	struct circ_buf *xmit = &uport->state->xmit;
> +	unsigned int tx_bytes, remaining = chunk;
> +	u8 buf[BYTES_PER_FIFO_WORD];
> +	int c;

c can/should be uint too.

> +
> +	while (remaining) {
> +		memset(buf, 0, sizeof(buf));
> +		tx_bytes = min(remaining, BYTES_PER_FIFO_WORD);
> +
> +		for (c = 0; c < tx_bytes ; c++) {
> +			buf[c] = xmit->buf[xmit->tail];
> +			uart_xmit_advance(uport, 1);
> +		}
> +
> +		iowrite32_rep(uport->membase + SE_GENI_TX_FIFOn, buf, 1);
> +
> +		remaining -= tx_bytes;
> +		port->tx_remaining -= tx_bytes;
> +	}
> +}

thanks,
-- 
-- 
js
suse labs