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-rw-r--r--target/linux/pxa/patches-2.6.21/023-bugfix-serial-interrupt.patch25
1 files changed, 25 insertions, 0 deletions
diff --git a/target/linux/pxa/patches-2.6.21/023-bugfix-serial-interrupt.patch b/target/linux/pxa/patches-2.6.21/023-bugfix-serial-interrupt.patch
new file mode 100644
index 0000000000..7f2487ec00
--- /dev/null
+++ b/target/linux/pxa/patches-2.6.21/023-bugfix-serial-interrupt.patch
@@ -0,0 +1,25 @@
+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
+@@ -235,15 +235,19 @@ static inline irqreturn_t serial_pxa_irq
+ struct uart_pxa_port *up = dev_id;
+ unsigned int iir, lsr;
+
++ serial_out(up, UART_MCR, serial_in(up, UART_MCR) & ~UART_MCR_RTS); // Clear RTS
+ iir = serial_in(up, UART_IIR);
+ if (iir & UART_IIR_NO_INT)
+- return IRQ_NONE;
++ {
++ //printk(KERN_WARNING "serial_pxa_irq: odd -- interrupt triggered, but no interrupt in IIR: %08x\n",iir);
++ }
+ lsr = serial_in(up, UART_LSR);
+ if (lsr & UART_LSR_DR)
+ receive_chars(up, &lsr);
+ check_modem_status(up);
+ if (lsr & UART_LSR_THRE)
+ transmit_chars(up);
++ serial_out(up, UART_MCR, serial_in(up, UART_MCR) | UART_MCR_RTS); // Assert RTS
+ return IRQ_HANDLED;
+ }
+