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Diffstat (limited to 'packages/linux/linux-ezx-2.6.21/ezx-serial-bug-workaround.patch')
-rw-r--r--packages/linux/linux-ezx-2.6.21/ezx-serial-bug-workaround.patch45
1 files changed, 45 insertions, 0 deletions
diff --git a/packages/linux/linux-ezx-2.6.21/ezx-serial-bug-workaround.patch b/packages/linux/linux-ezx-2.6.21/ezx-serial-bug-workaround.patch
new file mode 100644
index 0000000000..9f30cc35fe
--- /dev/null
+++ b/packages/linux/linux-ezx-2.6.21/ezx-serial-bug-workaround.patch
@@ -0,0 +1,45 @@
+Work around some errata in the pxa serial code (copied from motorolas 2.4.x tree)
+
+Index: linux-2.6.20.7/drivers/serial/pxa.c
+===================================================================
+--- linux-2.6.20.7.orig/drivers/serial/pxa.c 2007-04-21 13:57:46.000000000 -0300
++++ linux-2.6.20.7/drivers/serial/pxa.c 2007-04-21 14:05:03.000000000 -0300
+@@ -29,6 +29,10 @@
+ #define SUPPORT_SYSRQ
+ #endif
+
++#define pxa_buggy_port(x) ({ \
++ int cpu_ver; asm("mrc%? p15, 0, %0, c0, c0" : "=r" (cpu_ver)); \
++ ((x) == PORT_PXA && (cpu_ver & ~1) == 0x69052100); })
++
+ #include <linux/module.h>
+ #include <linux/ioport.h>
+ #include <linux/init.h>
+@@ -195,7 +199,7 @@
+ if (uart_circ_empty(xmit))
+ serial_pxa_stop_tx(&up->port);
+ }
+-
++static inline irqreturn_t serial_pxa_irq(int, void *);
+ static void serial_pxa_start_tx(struct uart_port *port)
+ {
+ struct uart_pxa_port *up = (struct uart_pxa_port *)port;
+@@ -203,6 +207,8 @@
+ if (!(up->ier & UART_IER_THRI)) {
+ up->ier |= UART_IER_THRI;
+ serial_out(up, UART_IER, up->ier);
++ if (pxa_buggy_port(up->port.type))
++ serial_pxa_irq(up->port.irq, NULL);
+ }
+ }
+
+@@ -298,6 +304,9 @@
+
+ mcr |= up->mcr;
+
++ if (pxa_buggy_port(up->port.type) && up->port.irq != 0)
++ mcr ^= UART_MCR_OUT2;
++
+ serial_out(up, UART_MCR, mcr);
+ }
+