Re: [PATCH v3 08/13] tty: serial: qcom-geni-serial: refactor qcom_geni_serial_handle_tx()

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On 23. 11. 22, 12:07, 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().

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

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
---
  drivers/tty/serial/qcom_geni_serial.c | 54 +++++++++++++--------------
  1 file changed, 27 insertions(+), 27 deletions(-)

diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index 68a1402fbe58..658b6d596f58 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -704,19 +704,42 @@ static void qcom_geni_serial_start_rx(struct uart_port *uport)
  	writel(irq_en, uport->membase + SE_GENI_M_IRQ_EN);
  }

I know you just shuffle the code, but:

+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;
+	u8 buf[BYTES_PER_FIFO_WORD];
+	size_t remaining = chunk;

Why size_t when the others are uints? Well, BYTES_PER_FIFO_WORD should be defined as 4U.

+	unsigned int tx_bytes;
+	int c;
+
+	while (remaining) {
+		memset(buf, 0, sizeof(buf));
+		tx_bytes = min_t(size_t, remaining, BYTES_PER_FIFO_WORD);

Then, no need for min_t.

+
+		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);

I wonder, why is _rep variant used to transfer a single word? Only to hide the cast?

thanks,
--
js
suse labs




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