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Diffstat (limited to 'packages/linux/gumstix-kernel-2.6.21/bugfix-serial-register-status.patch')
-rw-r--r--packages/linux/gumstix-kernel-2.6.21/bugfix-serial-register-status.patch69
1 files changed, 69 insertions, 0 deletions
diff --git a/packages/linux/gumstix-kernel-2.6.21/bugfix-serial-register-status.patch b/packages/linux/gumstix-kernel-2.6.21/bugfix-serial-register-status.patch
new file mode 100644
index 0000000000..e25436b8ee
--- /dev/null
+++ b/packages/linux/gumstix-kernel-2.6.21/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;
+ }