[linux-dvb] PATCH: Leadtek DTVb1800H require longer delay for tuner reset

[linux-dvb] PATCH: Leadtek DTVb1800H require longer delay for tuner reset

[Mirek Slugeň]

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Hi,

	I am using alot of tuners Leadtek DTV1800H under Linux, minimum 5 
devices per one PC with kernel 2.6.37.4. I discovered bug which I can se 
very often but not always. When device tuner is reseted there is not 
enough time to do all needed stuff and sometimes (randomly) kernel show 
this message:

[  821.369647] cx88[0]/1: IRQ loop detected, disabling interrupts

Patch is again very simple, we need to adjust time in reset function 
after cx_clear and cx_set calls from 50 to 75 us. I tested this patch on 
4 PC with similar problems and all are without this issue.

M. Slugen

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diff -Naur linux-2.6.37.4.old//drivers/media/video/cx88/cx88-cards.c linux-2.6.37.4/drivers/media/video/cx88/cx88-cards.c
--- linux-2.6.37.4.old//drivers/media/video/cx88/cx88-cards.c	2011-03-20 21:30:52.000000000 +0100
+++ linux-2.6.37.4/drivers/media/video/cx88/cx88-cards.c	2011-03-20 22:25:54.710228001 +0100
@@ -3019,9 +3019,9 @@
 		cx_set(MO_GP1_IO, 0x1010);
 		mdelay(50);
 		cx_clear(MO_GP1_IO, 0x10);
-		mdelay(50);
+		mdelay(75);
 		cx_set(MO_GP1_IO, 0x10);
-		mdelay(50);
+		mdelay(75);
 		return 0;
 	}
 	return -EINVAL;

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