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From: "Mirek Slugeň" <thunder.m@email.cz>
To: linux-dvb@linuxtv.org
Cc: linux-kernel@vger.kernel.org
Subject: PATCH: Leadtek DTVb1800H require longer delay for tuner reset
Date: Sun, 20 Mar 2011 23:05:00 +0100	[thread overview]
Message-ID: <4D867A0C.7050809@email.cz> (raw)

[-- Attachment #1: Type: text/plain, Size: 586 bytes --]

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

[-- Attachment #2: kernel_cx88_reset.diff --]
[-- Type: text/x-patch, Size: 533 bytes --]

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;

WARNING: multiple messages have this Message-ID (diff)
From: "Mirek Slugeň" <thunder.m@email.cz>
To: linux-dvb@linuxtv.org
Cc: linux-kernel@vger.kernel.org
Subject: [linux-dvb] PATCH: Leadtek DTVb1800H require longer delay for tuner reset
Date: Sun, 20 Mar 2011 23:05:00 +0100	[thread overview]
Message-ID: <4D867A0C.7050809@email.cz> (raw)

[-- Attachment #1: Type: text/plain, Size: 586 bytes --]

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

[-- Attachment #2: kernel_cx88_reset.diff --]
[-- Type: text/x-patch, Size: 533 bytes --]

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;

[-- Attachment #3: Type: text/plain, Size: 228 bytes --]

_______________________________________________
linux-dvb users mailing list
For V4L/DVB development, please use instead linux-media@vger.kernel.org
linux-dvb@linuxtv.org
http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb

             reply	other threads:[~2011-03-20 22:05 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-03-20 22:05 Mirek Slugeň [this message]
2011-03-20 22:05 ` [linux-dvb] PATCH: Leadtek DTVb1800H require longer delay for tuner reset Mirek Slugeň
2011-03-21  8:44 ` Jiri Slaby

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