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65 lines
2.5 KiB
Diff
65 lines
2.5 KiB
Diff
From patchwork Fri Feb 7 09:53:35 2020
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Content-Type: text/plain; charset="utf-8"
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MIME-Version: 1.0
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Content-Transfer-Encoding: 7bit
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X-Patchwork-Submitter: Daniel Golle <daniel@makrotopia.org>
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X-Patchwork-Id: 1190470
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Date: Fri, 7 Feb 2020 11:53:35 +0200
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From: Daniel Golle <daniel@makrotopia.org>
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To: linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org
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Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
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Jiri Slaby <jslaby@suse.com>,
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Chuanhong Guo <gch981213@gmail.com>,
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Eitan Cohen <eitan@neot-semadar.com>,
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Ori Gofen <origofen@gmail.com>
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Subject: [PATCH] serial: ar933x_uart: set UART_CS_{RX,TX}_READY_ORIDE
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Message-ID: <20200207095335.GA179836@makrotopia.org>
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MIME-Version: 1.0
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Content-Disposition: inline
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Sender: linux-kernel-owner@vger.kernel.org
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Precedence: bulk
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List-ID: <linux-kernel.vger.kernel.org>
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X-Mailing-List: linux-kernel@vger.kernel.org
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On AR934x this UART is usually not initialized by the bootloader
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as it is only used as a secondary serial port while the primary
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UART is a newly introduced NS16550-compatible.
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In order to make use of the ar933x-uart on AR934x without RTS/CTS
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hardware flow control, one needs to set the
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UART_CS_{RX,TX}_READY_ORIDE bits as other than on AR933x where this
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UART is used as primary/console, the bootloader on AR934x typically
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doesn't set those bits.
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Setting them explicitely on AR933x should not do any harm, so just
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set them unconditionally.
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Tested-by: Chuanhong Guo <gch981213@gmail.com>
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Signed-off-by: Daniel Golle <daniel@makrotopia.org>
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---
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drivers/tty/serial/ar933x_uart.c | 8 ++++++++
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1 file changed, 8 insertions(+)
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--- a/drivers/tty/serial/ar933x_uart.c
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+++ b/drivers/tty/serial/ar933x_uart.c
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@@ -286,6 +286,10 @@ static void ar933x_uart_set_termios(stru
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ar933x_uart_rmw_set(up, AR933X_UART_CS_REG,
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AR933X_UART_CS_HOST_INT_EN);
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+ /* enable RX and TX ready overide */
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+ ar933x_uart_rmw_set(up, AR933X_UART_CS_REG,
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+ AR933X_UART_CS_TX_READY_ORIDE | AR933X_UART_CS_RX_READY_ORIDE);
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+
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/* reenable the UART */
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ar933x_uart_rmw(up, AR933X_UART_CS_REG,
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AR933X_UART_CS_IF_MODE_M << AR933X_UART_CS_IF_MODE_S,
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@@ -418,6 +422,10 @@ static int ar933x_uart_startup(struct ua
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ar933x_uart_rmw_set(up, AR933X_UART_CS_REG,
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AR933X_UART_CS_HOST_INT_EN);
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+ /* enable RX and TX ready overide */
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+ ar933x_uart_rmw_set(up, AR933X_UART_CS_REG,
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+ AR933X_UART_CS_TX_READY_ORIDE | AR933X_UART_CS_RX_READY_ORIDE);
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+
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/* Enable RX interrupts */
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up->ier = AR933X_UART_INT_RX_VALID;
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ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier);
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