1 files changed, 69 insertions, 0 deletions
diff --git a/target/linux/pxa/patches-2.6.21/024-bugfix-serial-register-status.patch b/target/linux/pxa/patches-2.6.21/024-bugfix-serial-register-status.patch
new file mode 100644
index 0000000000..e25436b8ee
--- /dev/null
+++ b/target/linux/pxa/patches-2.6.21/024-bugfix-serial-register-status.patch
@@ -0,0 +1,69 @@
+Index: linux-2.6.21gum/drivers/serial/pxa.c
+===================================================================
+--- linux-2.6.21gum.orig/drivers/serial/pxa.c
++++ linux-2.6.21gum/drivers/serial/pxa.c
+@@ -57,6 +57,8 @@ struct uart_pxa_port {
+ 	unsigned int            lsr_break_flag;
+ 	unsigned int		cken;
+ 	char			*name;
++	unsigned int		msr;
++	unsigned int		lsr;
+ };
+ 
+ static inline unsigned int serial_in(struct uart_pxa_port *up, int offset)
+@@ -159,6 +161,7 @@ static inline void receive_chars(struct 
+ 
+ 	ignore_char:
+ 		*status = serial_in(up, UART_LSR);
++		up->lsr = *status;
+ 	} while ((*status & UART_LSR_DR) && (max_count-- > 0));
+ 	tty_flip_buffer_push(tty);
+ }
+@@ -211,7 +214,7 @@ static inline void check_modem_status(st
+ 	int status;
+ 
+ 	status = serial_in(up, UART_MSR);
+-
++	up->msr = status;
+ 	if ((status & UART_MSR_ANY_DELTA) == 0)
+ 		return;
+ 
+@@ -242,6 +245,7 @@ static inline irqreturn_t serial_pxa_irq
+ 		//printk(KERN_WARNING "serial_pxa_irq: odd -- interrupt triggered, but no interrupt in IIR: %08x\n",iir);
+ 	}
+ 	lsr = serial_in(up, UART_LSR);
++	up->lsr = lsr;
+ 	if (lsr & UART_LSR_DR)
+ 		receive_chars(up, &lsr);
+ 	check_modem_status(up);
+@@ -258,7 +262,7 @@ static unsigned int serial_pxa_tx_empty(
+ 	unsigned int ret;
+ 
+ 	spin_lock_irqsave(&up->port.lock, flags);
+-	ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
++	ret = up->lsr & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
+ 	spin_unlock_irqrestore(&up->port.lock, flags);
+ 
+ 	return ret;
+@@ -270,7 +274,7 @@ static unsigned int serial_pxa_get_mctrl
+ 	unsigned char status;
+ 	unsigned int ret;
+ 
+-	status = serial_in(up, UART_MSR);
++	status = up->msr;
+ 
+ 	ret = 0;
+ 	if (status & UART_MSR_DCD)
+@@ -400,10 +404,10 @@ static int serial_pxa_startup(struct uar
+ 	/*
+ 	 * And clear the interrupt registers again for luck.
+ 	 */
+-	(void) serial_in(up, UART_LSR);
++	up->lsr = serial_in(up, UART_LSR);
+ 	(void) serial_in(up, UART_RX);
+ 	(void) serial_in(up, UART_IIR);
+-	(void) serial_in(up, UART_MSR);
++	up->msr = serial_in(up, UART_MSR);
+ 
+ 	return 0;
+ }