From: satya priya <skakit@codeaurora.org>
To: gregkh@linuxfoundation.org
Cc: swboyd@chromium.org, mgautam@codeaurora.org,
linux-arm-msm@vger.kernel.org, linux-serial@vger.kernel.org,
akashast@codeaurora.org, rojay@codeaurora.org,
msavaliy@qti.qualcomm.com, satya priya <skakit@codeaurora.org>
Subject: [PATCH V2 2/2] tty: serial: qcom_geni_serial: Fix RX cancel command failure
Date: Tue, 25 Feb 2020 19:24:22 +0530 [thread overview]
Message-ID: <1582638862-9344-3-git-send-email-skakit@codeaurora.org> (raw)
In-Reply-To: <1582638862-9344-1-git-send-email-skakit@codeaurora.org>
RX cancel command fails when BT is switched on and off multiple times.
To handle this, poll for the cancel bit in SE_GENI_S_IRQ_STATUS register
instead of SE_GENI_S_CMD_CTRL_REG.
As per the HPG update, handle the RX last bit after cancel command
and flush out the RX FIFO buffer.
Signed-off-by: satya priya <skakit@codeaurora.org>
---
drivers/tty/serial/qcom_geni_serial.c | 18 ++++++++++++++----
1 file changed, 14 insertions(+), 4 deletions(-)
diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index d2a909c..22d99b0 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -129,6 +129,7 @@ static int handle_rx_console(struct uart_port *uport, u32 bytes, bool drop);
static int handle_rx_uart(struct uart_port *uport, u32 bytes, bool drop);
static unsigned int qcom_geni_serial_tx_empty(struct uart_port *port);
static void qcom_geni_serial_stop_rx(struct uart_port *uport);
+static void qcom_geni_serial_handle_rx(struct uart_port *uport, bool drop);
static const unsigned long root_freq[] = {7372800, 14745600, 19200000, 29491200,
32000000, 48000000, 64000000, 80000000,
@@ -599,7 +600,7 @@ static void qcom_geni_serial_stop_rx(struct uart_port *uport)
u32 irq_en;
u32 status;
struct qcom_geni_serial_port *port = to_dev_port(uport, uport);
- u32 irq_clear = S_CMD_DONE_EN;
+ u32 s_irq_status;
irq_en = readl(uport->membase + SE_GENI_S_IRQ_EN);
irq_en &= ~(S_RX_FIFO_WATERMARK_EN | S_RX_FIFO_LAST_EN);
@@ -615,10 +616,19 @@ static void qcom_geni_serial_stop_rx(struct uart_port *uport)
return;
geni_se_cancel_s_cmd(&port->se);
- qcom_geni_serial_poll_bit(uport, SE_GENI_S_CMD_CTRL_REG,
- S_GENI_CMD_CANCEL, false);
+ qcom_geni_serial_poll_bit(uport, SE_GENI_S_IRQ_STATUS,
+ S_CMD_CANCEL_EN, true);
+ /*
+ * If timeout occurs secondary engine remains active
+ * and Abort sequence is executed.
+ */
+ s_irq_status = readl(uport->membase + SE_GENI_S_IRQ_STATUS);
+ /* Flush the Rx buffer */
+ if (s_irq_status & S_RX_FIFO_LAST_EN)
+ qcom_geni_serial_handle_rx(uport, true);
+ writel(s_irq_status, uport->membase + SE_GENI_S_IRQ_CLEAR);
+
status = readl(uport->membase + SE_GENI_STATUS);
- writel(irq_clear, uport->membase + SE_GENI_S_IRQ_CLEAR);
if (status & S_GENI_CMD_ACTIVE)
qcom_geni_serial_abort_rx(uport);
}
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation
prev parent reply other threads:[~2020-02-25 13:56 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-25 13:54 [PATCH V2 0/2] Fix RX cancel command failure satya priya
2020-02-25 13:54 ` [PATCH V2 1/2] tty: serial: qcom_geni_serial: Allocate port->rx_fifo buffer in probe satya priya
2020-02-28 22:54 ` Stephen Boyd
2020-03-04 13:38 ` skakit
2020-02-28 23:01 ` Stephen Boyd
2020-03-04 13:34 ` skakit
2020-03-04 17:48 ` Stephen Boyd
2020-02-25 13:54 ` satya priya [this message]
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