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Date: Thu, 27 Feb 2020 14:37:06 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Ryan Case <ryandcase@...omium.org>,
Evan Green <evgreen@...omium.org>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 58/97] tty: serial: qcom_geni_serial: Remove xfer_mode variable
From: Ryan Case <ryandcase@...omium.org>
[ Upstream commit bdc05a8a3f822ca0662464055f902faf760da6be ]
The driver only supports FIFO mode so setting and checking this variable
is unnecessary. If DMA support is ever added then such checks can be
introduced.
Signed-off-by: Ryan Case <ryandcase@...omium.org>
Reviewed-by: Evan Green <evgreen@...omium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/tty/serial/qcom_geni_serial.c | 67 ++++++++++-----------------
1 file changed, 24 insertions(+), 43 deletions(-)
diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index 080fa1d1ecbfd..4182129925dec 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -101,7 +101,6 @@ struct qcom_geni_serial_port {
u32 tx_fifo_depth;
u32 tx_fifo_width;
u32 rx_fifo_depth;
- enum geni_se_xfer_mode xfer_mode;
bool setup;
int (*handle_rx)(struct uart_port *uport, u32 bytes, bool drop);
unsigned int baud;
@@ -547,29 +546,20 @@ static int handle_rx_uart(struct uart_port *uport, u32 bytes, bool drop)
static void qcom_geni_serial_start_tx(struct uart_port *uport)
{
u32 irq_en;
- struct qcom_geni_serial_port *port = to_dev_port(uport, uport);
u32 status;
- if (port->xfer_mode == GENI_SE_FIFO) {
- /*
- * readl ensures reading & writing of IRQ_EN register
- * is not re-ordered before checking the status of the
- * Serial Engine.
- */
- status = readl(uport->membase + SE_GENI_STATUS);
- if (status & M_GENI_CMD_ACTIVE)
- return;
+ status = readl(uport->membase + SE_GENI_STATUS);
+ if (status & M_GENI_CMD_ACTIVE)
+ return;
- if (!qcom_geni_serial_tx_empty(uport))
- return;
+ if (!qcom_geni_serial_tx_empty(uport))
+ return;
- irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN);
- irq_en |= M_TX_FIFO_WATERMARK_EN | M_CMD_DONE_EN;
+ irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN);
+ irq_en |= M_TX_FIFO_WATERMARK_EN | M_CMD_DONE_EN;
- writel(DEF_TX_WM, uport->membase +
- SE_GENI_TX_WATERMARK_REG);
- writel(irq_en, uport->membase + SE_GENI_M_IRQ_EN);
- }
+ writel(DEF_TX_WM, uport->membase + SE_GENI_TX_WATERMARK_REG);
+ writel(irq_en, uport->membase + SE_GENI_M_IRQ_EN);
}
static void qcom_geni_serial_stop_tx(struct uart_port *uport)
@@ -579,12 +569,8 @@ static void qcom_geni_serial_stop_tx(struct uart_port *uport)
struct qcom_geni_serial_port *port = to_dev_port(uport, uport);
irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN);
- irq_en &= ~M_CMD_DONE_EN;
- if (port->xfer_mode == GENI_SE_FIFO) {
- irq_en &= ~M_TX_FIFO_WATERMARK_EN;
- writel(0, uport->membase +
- SE_GENI_TX_WATERMARK_REG);
- }
+ irq_en &= ~(M_CMD_DONE_EN | M_TX_FIFO_WATERMARK_EN);
+ writel(0, uport->membase + SE_GENI_TX_WATERMARK_REG);
writel(irq_en, uport->membase + SE_GENI_M_IRQ_EN);
status = readl(uport->membase + SE_GENI_STATUS);
/* Possible stop tx is called multiple times. */
@@ -614,15 +600,13 @@ static void qcom_geni_serial_start_rx(struct uart_port *uport)
geni_se_setup_s_cmd(&port->se, UART_START_READ, 0);
- if (port->xfer_mode == GENI_SE_FIFO) {
- irq_en = readl(uport->membase + SE_GENI_S_IRQ_EN);
- irq_en |= S_RX_FIFO_WATERMARK_EN | S_RX_FIFO_LAST_EN;
- writel(irq_en, uport->membase + SE_GENI_S_IRQ_EN);
+ irq_en = readl(uport->membase + SE_GENI_S_IRQ_EN);
+ irq_en |= S_RX_FIFO_WATERMARK_EN | S_RX_FIFO_LAST_EN;
+ writel(irq_en, uport->membase + SE_GENI_S_IRQ_EN);
- irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN);
- irq_en |= M_RX_FIFO_WATERMARK_EN | M_RX_FIFO_LAST_EN;
- writel(irq_en, uport->membase + SE_GENI_M_IRQ_EN);
- }
+ irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN);
+ irq_en |= M_RX_FIFO_WATERMARK_EN | M_RX_FIFO_LAST_EN;
+ writel(irq_en, uport->membase + SE_GENI_M_IRQ_EN);
}
static void qcom_geni_serial_stop_rx(struct uart_port *uport)
@@ -632,15 +616,13 @@ static void qcom_geni_serial_stop_rx(struct uart_port *uport)
struct qcom_geni_serial_port *port = to_dev_port(uport, uport);
u32 irq_clear = S_CMD_DONE_EN;
- if (port->xfer_mode == GENI_SE_FIFO) {
- irq_en = readl(uport->membase + SE_GENI_S_IRQ_EN);
- irq_en &= ~(S_RX_FIFO_WATERMARK_EN | S_RX_FIFO_LAST_EN);
- writel(irq_en, uport->membase + SE_GENI_S_IRQ_EN);
+ irq_en = readl(uport->membase + SE_GENI_S_IRQ_EN);
+ irq_en &= ~(S_RX_FIFO_WATERMARK_EN | S_RX_FIFO_LAST_EN);
+ writel(irq_en, uport->membase + SE_GENI_S_IRQ_EN);
- irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN);
- irq_en &= ~(M_RX_FIFO_WATERMARK_EN | M_RX_FIFO_LAST_EN);
- writel(irq_en, uport->membase + SE_GENI_M_IRQ_EN);
- }
+ irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN);
+ irq_en &= ~(M_RX_FIFO_WATERMARK_EN | M_RX_FIFO_LAST_EN);
+ writel(irq_en, uport->membase + SE_GENI_M_IRQ_EN);
status = readl(uport->membase + SE_GENI_STATUS);
/* Possible stop rx is called multiple times. */
@@ -878,7 +860,6 @@ static int qcom_geni_serial_port_setup(struct uart_port *uport)
* Make an unconditional cancel on the main sequencer to reset
* it else we could end up in data loss scenarios.
*/
- port->xfer_mode = GENI_SE_FIFO;
if (uart_console(uport))
qcom_geni_serial_poll_tx_done(uport);
geni_se_config_packing(&port->se, BITS_PER_BYTE, port->tx_bytes_pw,
@@ -886,7 +867,7 @@ static int qcom_geni_serial_port_setup(struct uart_port *uport)
geni_se_config_packing(&port->se, BITS_PER_BYTE, port->rx_bytes_pw,
false, false, true);
geni_se_init(&port->se, UART_RX_WM, port->rx_fifo_depth - 2);
- geni_se_select_mode(&port->se, port->xfer_mode);
+ geni_se_select_mode(&port->se, GENI_SE_FIFO);
if (!uart_console(uport)) {
port->rx_fifo = devm_kcalloc(uport->dev,
port->rx_fifo_depth, sizeof(u32), GFP_KERNEL);
--
2.20.1
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