Henrique de Moraes Holschuh wrote: > On Tue, 05 Feb 2008, 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 <[EMAIL PROTECTED]> >> --- >> 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)) > > ACK. This needs to be sent to stable as well. I think both 2.6.22 and > 2.6.23 need this patch. >
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