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From: Jiada Wang <jiada_wang@mentor.com>
To: <gregkh@linuxfoundation.org>, <jslaby@suse.cz>,
	<linux-serial@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Cc: <jiada_wang@mentor.com>, <anton_bondarenko@mentor.com>,
	<dirk.behme@de.bosch.com>
Subject: [PATCH v1 03/15] serial: imx: remove unneeded imx_transmit_buffer() from imx_start_tx()
Date: Tue, 9 Dec 2014 18:11:24 +0900	[thread overview]
Message-ID: <1418116296-12082-4-git-send-email-jiada_wang@mentor.com> (raw)
In-Reply-To: <1418116296-12082-1-git-send-email-jiada_wang@mentor.com>

From: Dirk Behme <dirk.behme@de.bosch.com>

Use imx_start_tx() just to enable the TX interrupt. It's the job of the
TX interrupt ISR to fill the transmit buffer, then. If the transmit buffer
is empty, the TX interrupt should be executed as soon as the start_tx()
enables the interrupt, so there is no reason for the extra
imx_transmit_buffer() call, here. Remove it.

Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
Signed-off-by: Andy Lowe <andy_lowe@mentor.com>
---
 drivers/tty/serial/imx.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 969bc65..be05b75 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -621,9 +621,6 @@ static void imx_start_tx(struct uart_port *port)
 			imx_dma_tx(sport);
 		return;
 	}
-
-	if (readl(sport->port.membase + uts_reg(sport)) & UTS_TXEMPTY)
-		imx_transmit_buffer(sport);
 }
 
 static irqreturn_t imx_rtsint(int irq, void *dev_id)
-- 
1.9.3


  parent reply	other threads:[~2014-12-09  9:11 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-12-09  9:11 [PATCH v1 00/15] serial: imx: misc fix and features Jiada Wang
2014-12-09  9:11 ` [PATCH v1 01/15] serial: imx: add CREAD flag support Jiada Wang
2014-12-09  9:11 ` [PATCH v1 02/15] serial: imx: use locking to stop concurrent access of UCR1 Jiada Wang
2014-12-09  9:11 ` Jiada Wang [this message]
2014-12-09  9:11 ` [PATCH v1 04/15] serial: imx: TX DMA: clean up sg initialization Jiada Wang
2014-12-09  9:11 ` [PATCH v1 05/15] serial: imx: unmap sg in case of dmaengine_prep_slave_sg() failure Jiada Wang
2014-12-09  9:11 ` [PATCH v1 06/15] serial: imx: unmap scatter gather list in imx_flush_buffer Jiada Wang
2014-12-09  9:11 ` [PATCH v1 07/15] serial: imx: use dma_is_txing to synchronize dma_tx_callback and imx_dma_tx Jiada Wang
2014-12-09  9:11 ` [PATCH v1 08/15] Revert "serial: imx: always wake up the processes in the TX callback" Jiada Wang
2014-12-09  9:11 ` [PATCH v1 09/15] serial: imx: call imx_dma_tx() again in dma_tx_callback Jiada Wang
2014-12-09  9:11 ` [PATCH v1 10/15] serial: imx: disable TDMAEN in imx_flush_buffer() Jiada Wang
2014-12-09  9:11 ` [PATCH v1 11/15] serial: imx: initialized DMA w/o HW flow enabled Jiada Wang
2015-04-09 12:00   ` Sebastian Andrzej Siewior
2015-04-13  7:40     ` jiwang
2015-04-13  8:06       ` Sebastian Andrzej Siewior
2015-04-17  9:18         ` jiwang
2015-04-17 10:31           ` Sebastian Andrzej Siewior
2015-05-06 16:08           ` Nicolae Rosia
2015-05-06 16:12             ` Sebastian Andrzej Siewior
2015-05-06 16:46               ` Nicolae Rosia
2015-05-06 17:30                 ` Sebastian Andrzej Siewior
2015-05-07 13:55                   ` Nicolae Rosia
2015-05-07 13:58                     ` Sebastian Andrzej Siewior
2014-12-09  9:11 ` [PATCH v1 12/15] serial: imx: start rx_dma once RXFIFO is not empty Jiada Wang
2014-12-09  9:11 ` [PATCH v1 13/15] serial: imx: Enable UCR4_OREN in startup interface Jiada Wang
2014-12-09  9:11 ` [PATCH v1 14/15] serial: imx: Fix issue in software flow control Jiada Wang
2014-12-09  9:11 ` [PATCH v1 15/15] serial: imx: Support sw flow control in DMA mode Jiada Wang

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