Re: [PATCH 08/15] tty: serial: qcom-geni-serial: split out the FIFO tx code

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On 18/11/2022 13:25, Bartosz Golaszewski wrote:
From: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>

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().

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
---
Reviewed-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>

Konrad
  drivers/tty/serial/qcom_geni_serial.c | 60 +++++++++++++++------------
  1 file changed, 33 insertions(+), 27 deletions(-)

diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index 39041538e5d2..4b155ca0ac74 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -701,19 +701,48 @@ static void qcom_geni_serial_start_rx(struct uart_port *uport)
  	writel(irq_en, uport->membase + SE_GENI_M_IRQ_EN);
  }
+static int 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;
+	size_t remaining = chunk;
+	int i, tail = xmit->tail;
+
+	for (i = 0; i < chunk; ) {
+		unsigned int tx_bytes;
+		u8 buf[sizeof(u32)];
+		int c;
+
+		memset(buf, 0, sizeof(buf));
+		tx_bytes = min_t(size_t, remaining, BYTES_PER_FIFO_WORD);
+
+		for (c = 0; c < tx_bytes ; c++) {
+			buf[c] = xmit->buf[tail++];
+			tail &= UART_XMIT_SIZE - 1;
+		}
+
+		iowrite32_rep(uport->membase + SE_GENI_TX_FIFOn, buf, 1);
+
+		i += tx_bytes;
+		uport->icount.tx += tx_bytes;
+		remaining -= tx_bytes;
+		port->tx_remaining -= tx_bytes;
+	}
+
+	return tail;
+}
+
  static void qcom_geni_serial_handle_tx(struct uart_port *uport, bool done,
  		bool active)
  {
  	struct qcom_geni_serial_port *port = to_dev_port(uport);
  	struct circ_buf *xmit = &uport->state->xmit;
  	size_t avail;
-	size_t remaining;
  	size_t pending;
-	int i;
  	u32 status;
  	u32 irq_en;
  	unsigned int chunk;
-	int tail;
status = readl(uport->membase + SE_GENI_TX_FIFO_STATUS); @@ -732,7 +761,6 @@ static void qcom_geni_serial_handle_tx(struct uart_port *uport, bool done,
  	avail = port->tx_fifo_depth - (status & TX_FIFO_WC);
  	avail *= BYTES_PER_FIFO_WORD;
- tail = xmit->tail;
  	chunk = min(avail, pending);
  	if (!chunk)
  		goto out_write_wakeup;
@@ -747,29 +775,7 @@ static void qcom_geni_serial_handle_tx(struct uart_port *uport, bool done,
  					uport->membase + SE_GENI_M_IRQ_EN);
  	}
- remaining = chunk;
-	for (i = 0; i < chunk; ) {
-		unsigned int tx_bytes;
-		u8 buf[sizeof(u32)];
-		int c;
-
-		memset(buf, 0, sizeof(buf));
-		tx_bytes = min_t(size_t, remaining, BYTES_PER_FIFO_WORD);
-
-		for (c = 0; c < tx_bytes ; c++) {
-			buf[c] = xmit->buf[tail++];
-			tail &= UART_XMIT_SIZE - 1;
-		}
-
-		iowrite32_rep(uport->membase + SE_GENI_TX_FIFOn, buf, 1);
-
-		i += tx_bytes;
-		uport->icount.tx += tx_bytes;
-		remaining -= tx_bytes;
-		port->tx_remaining -= tx_bytes;
-	}
-
-	xmit->tail = tail;
+	xmit->tail = qcom_geni_serial_send_chunk_fifo(uport, chunk);
/*
  	 * The tx fifo watermark is level triggered and latched. Though we had



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