From:   Johan Hovold <johan+linaro@kernel.org>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     Bjorn Andersson <andersson@kernel.org>,
        Andy Gross <agross@kernel.org>,
        Konrad Dybcio <konrad.dybcio@linaro.org>,
        Jiri Slaby <jirislaby@kernel.org>,
        Bartosz Golaszewski <bartosz.golaszewski@linaro.org>,
        Douglas Anderson <dianders@chromium.org>,
        Daniel Thompson <daniel.thompson@linaro.org>,
        linux-arm-msm@vger.kernel.org, linux-serial@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Johan Hovold <johan+linaro@kernel.org>
Subject: [PATCH 4/4] serial: qcom-geni: drop bogus uart_write_wakeup()
Date:   Tue,  7 Mar 2023 17:44:05 +0100
Message-Id: <20230307164405.14218-5-johan+linaro@kernel.org>
In-Reply-To: <20230307164405.14218-1-johan+linaro@kernel.org>
References: <20230307164405.14218-1-johan+linaro@kernel.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Drop the bogus uart_write_wakeup() from when setting up a new DMA
transfer, which does not free up any more space in the ring buffer.

Any pending writers will be woken up when the transfer completes.

Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
---
 drivers/tty/serial/qcom_geni_serial.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index 9871225b2f9b..28fbc927a546 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -634,10 +634,6 @@ static void qcom_geni_serial_start_tx_dma(struct uart_port *uport)
 	if (uart_circ_empty(xmit))
 		return;
 
-	xmit_size = uart_circ_chars_pending(xmit);
-	if (xmit_size < WAKEUP_CHARS)
-		uart_write_wakeup(uport);
-
 	xmit_size = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
 
 	qcom_geni_serial_setup_tx(uport, xmit_size);
-- 
2.39.2