Hi,
Forwarding to linux-media mailing list, hoping that someone there can
help out. I havn't worked in the code for years now, can't remember
what the AR irq bit is and can't find my copy of the saa7134 data sheet
too ...
cheers,
Gerd
-------- Original Message --------
Subject: hello kraxel
Date: Tue, 02 Apr 2013 15:48:42 +0800
From: zhaokai <zhaokai@xxxxxxxxxxx>
To: kraxel@xxxxxxxxxxx
Dear Kraxel:
My name is zhaokai, I am a soft developer working in beijing.
This is my first mail to The Kernel Developer, I am very excited.
Now I have a question about your code for saa7134 driver in linux kernel
2.6.21.
We use Loongson CPU,I compile kernel and run the image,when I run my
test app for saa7134 camera
this message will print:
saa7130[0]/irq: looping -- clearing all enable bits
I study the saa7134 driver code,find the message come from the follow code:
if (10 == loop) {
print_irqstatus(dev,loop,report,status);
if (report & SAA7134_IRQ_REPORT_PE) {
/* disable all parity error */
printk(KERN_WARNING "%s/irq: looping -- "
"clearing PE (parity error!) enable bit\n",dev->name);
saa_clearl(SAA7134_IRQ2,SAA7134_IRQ2_INTE_PE);
} else if (report & SAA7134_IRQ_REPORT_GPIO16) {
/* disable gpio16 IRQ */
printk(KERN_WARNING "%s/irq: looping -- "
"clearing GPIO16 enable bit\n",dev->name);
saa_clearl(SAA7134_IRQ2, SAA7134_IRQ2_INTE_GPIO16);
} else if (report & SAA7134_IRQ_REPORT_GPIO18) {
/* disable gpio18 IRQs */
printk(KERN_WARNING "%s/irq: looping -- "
"clearing GPIO18 enable bit\n",dev->name);
saa_clearl(SAA7134_IRQ2, SAA7134_IRQ2_INTE_GPIO18);
} else {
/* disable all irqs */
printk(KERN_WARNING "%s/irq: looping -- "
"clearing all enable bits\n",dev->name);
saa_writel(SAA7134_IRQ1,0);
saa_writel(SAA7134_IRQ2,0);
}
}
this is in the interrupt handle function,I add some print and find the
value of SAA7134_IRQ_REPORT register is 0x11 or 0x10, normally it would
be 0x1 or 0x0,
0x1x means SAA7134_IRQ_REPORT_AR, So what is the meaning of
SAA7134_IRQ_REPORT_AR ?
Best regards,
ZhaoKai
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