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Message-ID: <53EC21FC.4000204@gmail.com>
Date: Wed, 13 Aug 2014 19:42:04 -0700
From: Frank Rowand <frowand.list@...il.com>
To: frowand.list@...il.com
CC: Stephen Boyd <sboyd@...eaurora.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Linux Kernel list <linux-kernel@...r.kernel.org>,
"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH to be tested] serial: msm_serial: add missing sysrq handling
On 8/13/2014 7:33 PM, Frank Rowand wrote:
> On 8/12/2014 5:23 PM, Stephen Boyd wrote:
>> On 08/06/14 17:16, Frank Rowand wrote:
< snip >
> The patches you sent are a little hard to read since they modify further code
> that my patch modified. So I have redone your patches, as if my patch was
> not previously applied. Hopefully I did not make any mistakes there. I will
> reply to this email with each of your redone patches.
< snip >
Stephen's patch alternative number 1:
---
drivers/tty/serial/msm_serial.c | 44 ++++++++++++++++++++++++++++------------
drivers/tty/serial/msm_serial.h | 8 +++++++
2 files changed, 39 insertions(+), 13 deletions(-)
Index: b/drivers/tty/serial/msm_serial.c
===================================================================
--- a/drivers/tty/serial/msm_serial.c
+++ b/drivers/tty/serial/msm_serial.c
@@ -125,25 +125,28 @@ static void handle_rx_dm(struct uart_por
port->icount.rx += count;
while (count > 0) {
- unsigned int c;
+ unsigned char buf[4];
+ unsigned char *p = buf;
+ int sysrq, r_count;
sr = msm_read(port, UART_SR);
if ((sr & UART_SR_RX_READY) == 0) {
msm_port->old_snap_state -= count;
break;
}
- c = msm_read(port, UARTDM_RF);
- if (sr & UART_SR_RX_BREAK) {
- port->icount.brk++;
- if (uart_handle_break(port))
- continue;
- } else if (sr & UART_SR_PAR_FRAME_ERR)
- port->icount.frame++;
+ readsl(port->membase + UARTDM_RF, p, 1);
- /* TODO: handle sysrq */
- tty_insert_flip_string(tport, (char *)&c,
- (count > 4) ? 4 : count);
- count -= 4;
+ spin_unlock(&port->lock);
+ sysrq = uart_handle_sysrq_char(port, buf[0]);
+ spin_lock(&port->lock);
+ if (sysrq) {
+ p++;
+ count--;
+ }
+ r_count = min_t(int, count, sizeof(buf) - sysrq);
+ if (r_count)
+ tty_insert_flip_string(tport, p, r_count);
+ count -= r_count;
}
spin_unlock(&port->lock);
@@ -285,6 +288,17 @@ static irqreturn_t msm_irq(int irq, void
misr = msm_read(port, UART_MISR);
msm_write(port, 0, UART_IMR); /* disable interrupt */
+ if (misr & UART_IMR_RXBREAK_END) {
+ uart_handle_break(port);
+ port->icount.brk++;
+ msm_write(port, UART_CR_CMD_RESET_RXBREAK_END, UART_CR);
+ }
+
+ if (misr & UART_IMR_PAR_FRAME_ERR) {
+ port->icount.frame++;
+ msm_write(port, UART_CR_CMD_RESET_PAR_FRAME_ERR, UART_CR);
+ }
+
if (misr & (UART_IMR_RXLEV | UART_IMR_RXSTALE)) {
if (msm_port->is_uartdm)
handle_rx_dm(port, misr);
@@ -491,7 +505,8 @@ static int msm_startup(struct uart_port
/* turn on RX and CTS interrupts */
msm_port->imr = UART_IMR_RXLEV | UART_IMR_RXSTALE |
- UART_IMR_CURRENT_CTS;
+ UART_IMR_CURRENT_CTS | UART_IMR_RXBREAK_END |
+ UART_IMR_PAR_FRAME_ERR;
if (msm_port->is_uartdm) {
msm_write(port, 0xFFFFFF, UARTDM_DMRX);
@@ -566,6 +581,9 @@ static void msm_set_termios(struct uart_
else
mr |= UART_MR2_STOP_BIT_LEN_ONE;
+ mr |= UART_MR2_RX_BREAK_ZERO_CHAR_OFF;
+ mr |= UART_MR2_RX_ERROR_CHAR_OFF;
+
/* set parity, bits per char, and stop bit */
msm_write(port, mr, UART_MR2);
Index: b/drivers/tty/serial/msm_serial.h
===================================================================
--- a/drivers/tty/serial/msm_serial.h
+++ b/drivers/tty/serial/msm_serial.h
@@ -24,6 +24,8 @@
#define UART_MR1_CTS_CTL (1 << 6)
#define UART_MR2 0x0004
+#define UART_MR2_RX_ERROR_CHAR_OFF (1 << 9)
+#define UART_MR2_RX_BREAK_ZERO_CHAR_OFF (1 << 8)
#define UART_MR2_ERROR_MODE (1 << 6)
#define UART_MR2_BITS_PER_CHAR 0x30
#define UART_MR2_BITS_PER_CHAR_5 (0x0 << 4)
@@ -65,6 +67,9 @@
#define UART_CR_TX_ENABLE (1 << 2)
#define UART_CR_RX_DISABLE (1 << 1)
#define UART_CR_RX_ENABLE (1 << 0)
+#define UART_CR_CMD_RESET_RXBREAK_START ((1 << 11) | (2 << 4))
+#define UART_CR_CMD_RESET_RXBREAK_END ((1 << 11) | (3 << 4))
+#define UART_CR_CMD_RESET_PAR_FRAME_ERR ((1 << 11) | (4 << 4))
#define UART_IMR 0x0014
#define UART_IMR_TXLEV (1 << 0)
@@ -72,6 +77,9 @@
#define UART_IMR_RXLEV (1 << 4)
#define UART_IMR_DELTA_CTS (1 << 5)
#define UART_IMR_CURRENT_CTS (1 << 6)
+#define UART_IMR_RXBREAK_START (1 << 10)
+#define UART_IMR_RXBREAK_END (1 << 11)
+#define UART_IMR_PAR_FRAME_ERR (1 << 12)
#define UART_IPR_RXSTALE_LAST 0x20
#define UART_IPR_STALE_LSB 0x1F
--
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