Commit 5bc08e19 authored by Luis Alves's avatar Luis Alves Committed by Mauro Carvalho Chehab
Browse files

[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: default avatarLuis Alves <ljalvs@gmail.com>
Acked-by: default avatarAndy Walls <awalls@md.metrocast.net>
Signed-off-by: default avatarMauro Carvalho Chehab <m.chehab@samsung.com>
parent 00865fe6

drivers/media/pci/cx23885/cx23885-av.c

+13 −0
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 


#include "cx23885.h"

#include "cx23885-av.h"

#include "cx23885-video.h"



void cx23885_av_work_handler(struct work_struct *work)

{
@@ -32,5 +33,17 @@ void cx23885_av_work_handler(struct work_struct *work) 


	v4l2_subdev_call(dev->sd_cx25840, core, interrupt_service_routine,

			 PCI_MSK_AV_CORE, &handled);



	/* Getting here with the interrupt not handled

	   then probbaly flatiron does have pending interrupts.

	*/

	if (!handled) {

		/* clear left and right adc channel interrupt request flag */

		cx23885_flatiron_write(dev, 0x1f,

			cx23885_flatiron_read(dev, 0x1f) | 0x80);

		cx23885_flatiron_write(dev, 0x23,

			cx23885_flatiron_read(dev, 0x23) | 0x80);

	}



	cx23885_irq_enable(dev, PCI_MSK_AV_CORE);

}

drivers/media/pci/cx23885/cx23885-video.c

+2 −2
Original line number Diff line number Diff line
@@ -417,7 +417,7 @@ static void res_free(struct cx23885_dev *dev, struct cx23885_fh *fh, 
	mutex_unlock(&dev->lock);

}



static int cx23885_flatiron_write(struct cx23885_dev *dev, u8 reg, u8 data)

int cx23885_flatiron_write(struct cx23885_dev *dev, u8 reg, u8 data)

{

	/* 8 bit registers, 8 bit values */

	u8 buf[] = { reg, data };
@@ -428,7 +428,7 @@ static int cx23885_flatiron_write(struct cx23885_dev *dev, u8 reg, u8 data) 
	return i2c_transfer(&dev->i2c_bus[2].i2c_adap, &msg, 1);

}



static u8 cx23885_flatiron_read(struct cx23885_dev *dev, u8 reg)

u8 cx23885_flatiron_read(struct cx23885_dev *dev, u8 reg)

{

	/* 8 bit registers, 8 bit values */

	int ret;

drivers/media/pci/cx23885/cx23885-video.h

0 → 100644
+26 −0
Original line number Diff line number Diff line 
/*

 *  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

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