[media] cx23885[v4]: Fix interrupt storm when enabling IR receiver

Apparently the Flatiron genereates an interrupt after the built-in self
test for each of its left and right channels has completed.

Apparently Conexant wire-OR'ed the Flatiron's interrupt output with the
interrupt output of the CX23885 A/V core.

Those interrupts need to be handled, otherwise, they generate an
interrrupt request storm.

So:

- Add flatiron readreg and writereg functions prototypes
  on a new header file;
- Modify the av interrupt handler to cleanup flatiron IRQs if no other
  interrupt handling happens.

Signed-off-by: Luis Alves <ljalvs@gmail.com>
Acked-by: Andy Walls <awalls@md.metrocast.net>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/drivers/media/pci/cx23885/cx23885-video.h b/drivers/media/pci/cx23885/cx23885-video.h
new file mode 100644
index 000000000000..c961a2b0de0f
--- /dev/null
+++ b/drivers/media/pci/cx23885/cx23885-video.h
@@ -0,0 +1,26 @@
+/*
+ *  Driver for the Conexant CX23885/7/8 PCIe bridge
+ *
+ *  Copyright (C) 2010  Andy Walls <awalls@md.metrocast.net>
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License
+ *  as published by the Free Software Foundation; either version 2
+ *  of the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ *  02110-1301, USA.
+ */
+
+#ifndef _CX23885_VIDEO_H_
+#define _CX23885_VIDEO_H_
+int cx23885_flatiron_write(struct cx23885_dev *dev, u8 reg, u8 data);
+u8 cx23885_flatiron_read(struct cx23885_dev *dev, u8 reg);
+#endif