linux-kernel - PATCH: Leadtek DTVb1800H require longer delay for tuner reset

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Message-ID: <4D867A0C.7050809@email.cz>
Date:	Sun, 20 Mar 2011 23:05:00 +0100 
From:	Mirek Slugeň <thunder.m@...il.cz>
To:	linux-dvb@...uxtv.org
CC:	linux-kernel@...r.kernel.org
Subject: PATCH: Leadtek DTVb1800H require longer delay for tuner reset 

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

View attachment "kernel_cx88_reset.diff" of type "text/x-patch" (534 bytes)