[SERIAL] Fix status reporting with PL011 serial driver

The receiver status register reports latched error conditions, which
must be cleared by writing to it.  However, the data register reports
unlatched conditions which are associated with the current character.
Use the data register to interpret error status rather than the RSR.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/asm-arm/hardware/amba_serial.h b/include/asm-arm/hardware/amba_serial.h
index 71770aa6389f..dc726ffccebd 100644
--- a/include/asm-arm/hardware/amba_serial.h
+++ b/include/asm-arm/hardware/amba_serial.h
@@ -50,6 +50,11 @@
 #define UART011_ICR             0x44    /* Interrupt clear register. */
 #define UART011_DMACR           0x48    /* DMA control register. */
 
+#define UART011_DR_OE           (1 << 11)
+#define UART011_DR_BE           (1 << 10)
+#define UART011_DR_PE           (1 << 9)
+#define UART011_DR_FE           (1 << 8)
+
 #define UART01x_RSR_OE          0x08
 #define UART01x_RSR_BE          0x04
 #define UART01x_RSR_PE          0x02