From mboxrd@z Thu Jan 1 00:00:00 1970 From: Len Brown Subject: Re: [PATCH][drivers/misc/thinkpad_acpi.c] duplicate test if (level & TP_EC_FAN_FULLSPEED) Date: Thu, 7 Feb 2008 01:17:44 -0500 Message-ID: <200802070117.45119.lenb@kernel.org> References: <47A78CBB.2090401@tiscali.nl> <47A79EC8.6060700@tiscali.nl> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <47A79EC8.6060700-IWqWACnzNjzz+pZb47iToQ@public.gmane.org> Content-Disposition: inline List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: ibm-acpi-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: ibm-acpi-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org To: Roel Kluin <12o3l-IWqWACnzNjzz+pZb47iToQ@public.gmane.org> Cc: len.brown-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, ibm-acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org, Roland Dreier , ibm-acpi-N3TV7GIv+o9fyO9Q7EP/yw@public.gmane.org, lkml , linux-acpi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-acpi@vger.kernel.org Applied. thanks, -Len On Monday 04 February 2008 18:24, Roel Kluin wrote: > Roland Dreier wrote: > > > /* safety net should the EC not support AUTO > > > * or FULLSPEED mode bits and just ignore them */ > > > if (level & TP_EC_FAN_FULLSPEED) > > > level |= 7; /* safety min speed 7 */ > > > else if (level & TP_EC_FAN_FULLSPEED) > > > level |= 4; /* safety min speed 4 */ > > > > > > Note the duplicate test 'if (level & TP_EC_FAN_FULLSPEED)'. should > > > this be replaced by > > > > Actually I suspect one of the two tests should be against TP_EC_FAN_AUTO > > (based on the comment). > > > > Thanks Roland, for your info > > based on the comments in commit eaa7571b2d1a08873e4bdd8e6db3431df61cd9ad, > I think this should be modified like below: > > ACPI: thinkpad-acpi: add a safety net for TPEC fan control mode > The Linux ThinkPad community is not positive that all ThinkPads that do > HFSP EC fan control do implement full-speed and auto modes, some of the > earlier ones supporting HFSP might not. > > If the EC ignores the AUTO or FULL-SPEED bits, it will pay attention to the > lower three bits that set the fan level. And as thinkpad-acpi was leaving > these set to zero, it would stop(!) the fan, which is Not A Good Thing. > So, as a safety net, we now make sure to also set the fan level part of the > HFSP register to speed 7 for full-speed, and a minimum of speed 4 for auto > mode. > -- > second TP_EC_FAN_FULLSPEED should be P_EC_FAN_AUTO > > > Signed-off-by: Roel Kluin <12o3l-IWqWACnzNjzz+pZb47iToQ@public.gmane.org> > --- > diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c > index cf56647..3c323fe 100644 > --- a/drivers/misc/thinkpad_acpi.c > +++ b/drivers/misc/thinkpad_acpi.c > @@ -4138,7 +4138,7 @@ static int fan_set_level(int level) > * or FULLSPEED mode bits and just ignore them */ > if (level & TP_EC_FAN_FULLSPEED) > level |= 7; /* safety min speed 7 */ > - else if (level & TP_EC_FAN_FULLSPEED) > + else if (level & TP_EC_FAN_AUTO) > level |= 4; /* safety min speed 4 */ > > if (!acpi_ec_write(fan_status_offset, level)) > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/