From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.6 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 519F8C433DF for ; Thu, 15 Oct 2020 03:28:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CD54322241 for ; Thu, 15 Oct 2020 03:28:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="cuHHROqd" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726474AbgJOD2m (ORCPT ); Wed, 14 Oct 2020 23:28:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39612 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726012AbgJOD2m (ORCPT ); Wed, 14 Oct 2020 23:28:42 -0400 Received: from mail-pj1-x1041.google.com (mail-pj1-x1041.google.com [IPv6:2607:f8b0:4864:20::1041]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2769DC061755 for ; Wed, 14 Oct 2020 20:28:42 -0700 (PDT) Received: by mail-pj1-x1041.google.com with SMTP id gm14so963642pjb.2 for ; Wed, 14 Oct 2020 20:28:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:date:to:cc:subject:message-id:references:mime-version :content-disposition:content-transfer-encoding:in-reply-to; bh=14SuGuVOXVo93HjQdVSyi3/rxyEL0Oq/qFpXvjsBQ1w=; b=cuHHROqd2tNKZOVMQ2DKul4n54bWQAxIadRKcl6uZNlMRvAZz0DRfOWAQbQ8NgN9o3 mi40nNh19FQ5Z0ESRvW887dUIUCf7P7JiL3x9jWq/tab9a6ugkmHIfk+g5QkS3wwBQYq WWp/bU3azyZDAC6ficeOy5SCPCG/TZ6GAaFvv8XtyFUwuEJQwBjEiU2bTVIsMliJrl7t iJXX7QKRcY19YkhRWn9ifaXpgu+2zh8p12te6P4bg3YHxmhlwyMsT0K6Uj/afoEIOiWt vHOzRhd/NyDLQbdugDLrkyKzdykcL1L5kvItuV7jbzJUkyT7ZZK5rpi57MFgIZpAh5gm 8fBw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:date:to:cc:subject:message-id:references :mime-version:content-disposition:content-transfer-encoding :in-reply-to; bh=14SuGuVOXVo93HjQdVSyi3/rxyEL0Oq/qFpXvjsBQ1w=; b=qHBi1UHktX+r/PWBTKtf+alJpcdOXJaSzNpiSDdtPrpqK4oOY9VnpJR49XeHsTxknU iAPRT8h6NL8GLRsnsVCbHwMerZYFq/Ut0ffjewF78TuHHCXH/tZE3DjLd8AN9xlAsKGE gSFf6sjEz6vWnG9GkpbzZmh9drRMHSQ/AzDxcMNkSkiU6h1ajGCOwhh7LU31M81iLuTX TBt0t2Z3HqflKwGmDpsqwKUCLbAYzOKfVQfFiHHtYlNylRYdTREiyUlW/CwATZJDY45O yowzb1Zv8u5yR7Ve7GC/G5xouUDyvJ/DAYA08iaAiLaAbjD7tD8ttwMcldtSe2FeS2NI Z+hA== X-Gm-Message-State: AOAM532S8X2w+6B88kjUtoQkHT2L0fhxJnRjd8SLxXMwrvBbTTeJetTH 4IHrjsj5hPwv0RT4jussAeA= X-Google-Smtp-Source: ABdhPJxeJPeYC+kzgVWV5gvb+kgQtRnX0vtNAdw05eyURaXVwVqxLqjsAWYZBKBMIXpyrTvZ7muEfA== X-Received: by 2002:a17:902:9f96:b029:d4:c459:a181 with SMTP id g22-20020a1709029f96b02900d4c459a181mr2343123plq.28.1602732521408; Wed, 14 Oct 2020 20:28:41 -0700 (PDT) Received: from localhost ([2001:e42:102:1532:160:16:113:140]) by smtp.gmail.com with ESMTPSA id d145sm1244410pfd.136.2020.10.14.20.28.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 14 Oct 2020 20:28:40 -0700 (PDT) From: Coiby Xu X-Google-Original-From: Coiby Xu Date: Thu, 15 Oct 2020 11:27:04 +0800 To: Hans de Goede Cc: Linus Walleij , "open list:GPIO SUBSYSTEM" , wang jun , Nehal Shah , Shyam Sundar S K , linux-kernel-mentees@lists.linuxfoundation.org Subject: Re: Any other ways to debug GPIO interrupt controller (pinctrl-amd) for broken touchpads of a new laptop model? Message-ID: <20201015032704.6qgnj5wnzo2dovgq@Rk> References: <20201003230340.42mtl35n4ka4d5qw@Rk> <20201004051644.f3fg2oavbobrwhf6@Rk> <20201006044941.fdjsp346kc5thyzy@Rk> <20201006083157.3pg6zvju5buxspns@Rk> <69853d2b-239c-79d5-bf6f-7dc0eec65602@redhat.com> <4f02cbdf-e1dd-b138-4975-118dd4f86089@redhat.com> <20201014042420.fkkyabmrkiekpmfw@Rk> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org On Wed, Oct 14, 2020 at 01:46:14PM +0200, Hans de Goede wrote: >Hi, > >On 10/14/20 6:24 AM, Coiby Xu wrote: >>On Tue, Oct 06, 2020 at 11:29:40AM +0200, Hans de Goede wrote: >>> >>> >>>On 10/6/20 11:28 AM, Hans de Goede wrote: >>>>Hi, >>>> >>>>On 10/6/20 10:55 AM, Hans de Goede wrote: >>>>>Hi, >>>>> >>>>>On 10/6/20 10:31 AM, Coiby Xu wrote: >>>>>>On Tue, Oct 06, 2020 at 08:28:40AM +0200, Hans de Goede wrote: >>>>>>>Hi, >>>>>>> >>>>>>>On 10/6/20 6:49 AM, Coiby Xu wrote: >>>>>>>>Hi Hans and Linus, >>>>>>>> >>>>>>>>I've found the direct evidence proving the GPIO interrupt controller is >>>>>>>>malfunctioning. >>>>>>>> >>>>>>>>I've found a way to let the GPIO chip trigger an interrupt by accident >>>>>>>>when playing with the GPIO sysfs interface, >>>>>>>> >>>>>>>> - export pin130 which is used by the touchad >>>>>>>> - set the direction to be "out" >>>>>>>> - `echo 0 > value` will trigger the GPIO controller's parent irq and >>>>>>>>   "echo 1 > value" will make it stop firing >>>>>>>> >>>>>>>>(I'm not sure if this is yet another bug of the GPIO chip. Anyway I can >>>>>>>>manually trigger an interrupt now.) >>>>>>>> >>>>>>>>I wrote a C program is to let GPIO controller quickly generate some >>>>>>>>interrupts then disable the firing of interrupts by toggling pin#130's >>>>>>>>value with an specified time interval, i.e., set the value to 0 first >>>>>>>>and then after some time, re-set the value to 1. There is no interrupt >>>>>>>>firing unless time internal > 120ms (~7Hz). This explains why we can >>>>>>>>only see 7 interrupts for the GPIO controller's parent irq. >>>>>>> >>>>>>>That is a great find, well done. >>>>>>> >>>>>>>>My hypothesis is the GPIO doesn't have proper power setting so it stays >>>>>>>>in an idle state or its clock frequency is too low by default thus not >>>>>>>>quick enough to read interrupt input. Then pinctrl-amd must miss some >>>>>>>>code to configure the chip and I need a hardware reference manual of this >>>>>>>>GPIO chip (HID: AMDI0030) or reverse-engineer the driver for Windows >>>>>>>>since I couldn't find a copy of reference manual online? What would you >>>>>>>>suggest? >>>>>>> >>>>>>>This sounds like it might have something to do with the glitch filter. >>>>>>>The code in pinctrl-amd.c to setup the trigger-type also configures >>>>>>>the glitch filter, you could try changing that code to disable the >>>>>>>glitch-filter. The defines for setting the glitch-filter bits to >>>>>>>disabled are already there. >>>>>>> >>>>>> >>>>>>Disabling the glitch filter works like a charm! Other enthusiastic >>>>>>Linux users who have been troubled by this issue for months would >>>>>>also feel great to know this small tweaking could bring their >>>>>>touchpad back to life:) Thank you! >>>>> >>>>>That is good to hear, I'm glad that we have finally found a solution. >>>>> >>>>>>$ git diff >>>>>>diff --git a/drivers/pinctrl/pinctrl-amd.c b/drivers/pinctrl/pinctrl-amd.c >>>>>>index 9a760f5cd7ed..e786d779d6c8 100644 >>>>>>--- a/drivers/pinctrl/pinctrl-amd.c >>>>>>+++ b/drivers/pinctrl/pinctrl-amd.c >>>>>>@@ -463,7 +463,7 @@ static int amd_gpio_irq_set_type(struct irq_data *d, unsigned int type) >>>>>>                 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF); >>>>>>                 pin_reg |= ACTIVE_LOW << ACTIVE_LEVEL_OFF; >>>>>>                 pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF); >>>>>>-               pin_reg |= DB_TYPE_PRESERVE_HIGH_GLITCH << DB_CNTRL_OFF; >>>>>>+               /** pin_reg |= DB_TYPE_PRESERVE_HIGH_GLITCH << DB_CNTRL_OFF; */ >>>>>>                 irq_set_handler_locked(d, handle_level_irq); >>>>>>                 break; >>>>>> >>>>>>I will learn more about the glitch filter and the implementation of >>>>>>pinctrl and see if I can disable glitch filter only for this touchpad. >>>>> >>>>>The glitch filter likely also has settings for how long a glitch >>>>>lasts, which apparently goes all the way up to 120ms. If it would >>>>>only delay reporting by say 0.1ms and consider any pulse longer >>>>>then 0.1s not a glitch, then having it enabled would be fine. >>>>> >>>>>I don't think we want some sort of quirk here to only disable the >>>>>glitch filter for some touchpads. One approach might be to simply >>>>>disable it completely for level type irqs. >>>>> >>>>>What we really need here is some input from AMD engineers with how >>>>>this is all supposed to work. >>>>> >>>>>E.g. maybe the glitch-filter is setup by the BIOS and we should not >>>>>touch it all ? >>>>> >>>>>Or maybe instead of DB_TYPE_PRESERVE_HIGH_GLITCH low level interrupts >>>>>should use DB_TYPE_PRESERVE_LOW_GLITCH ?   Some docs for the hw >>>>>would really help here ... >>>> >>>>So I've been digging through the history of the pinctrl-amd.c driver >>>>and once upon a time it used to set a default debounce time of >>>>2.75 ms. >>>> >>>>See the patch generated by doing: >>>> >>>>git format-patch 8cf4345575a416e6856a6856ac6eaa31ad883126~..8cf4345575a416e6856a6856ac6eaa31ad883126 >>>> >>>>In a linux kernel checkout. >>>> >>>>So it would be interesting to add a debugging printk to see >>>>what the value of pin_reg & DB_TMR_OUT_MASK is for the troublesome >>>>GPIO. >>>> >>>>I guess that it might be all 1s (0xfffffffff) or some such which >>>>might be a way to check that we should disable the glitch-filter >>>>for this pin? >>> >>>p.s. >>> >>>Or maybe we should simply stop touching all the glitch-filter >>>related bits, in the same way as that old commit has already >>>removed the code setting the timing of the filter ? >>> >>>At least is seems that forcing the filter to be on without >>>sanitizing the de-bounce time is not a good idea. >>> >>Today I find an inconsistency in drivers/pinctrl/pinctrl-amd.c >>so there must be a bug. As far as I can understand pinctrl-amd, >>"pin_reg & ~DB_CNTRl_MASK" is used to mask out the debouncing >>feature, >> >>static int amd_gpio_set_debounce(struct gpio_chip *gc, unsigned offset, >>         unsigned debounce) >>{ >>     ... >>     if (debounce) { >>         ... >>         if (debounce < 61) { >>             pin_reg |= 1; >>             pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF); >>             pin_reg &= ~BIT(DB_TMR_LARGE_OFF); >>         ... >>         } else if (debounce < 1000000) { >>             time = debounce / 62500; >>             pin_reg |= time & DB_TMR_OUT_MASK; >>             pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF); >>             pin_reg |= BIT(DB_TMR_LARGE_OFF); >>         } else { >>             pin_reg &= ~DB_CNTRl_MASK; >>             ret = -EINVAL; >>         } >> >>     } else { >>         ... >>         pin_reg &= ~DB_CNTRl_MASK; >>     } >>     ... >>} >> >>However in amd_gpio_irq_set_type, "ping_reg & ~(DB_CNTRl_MASK << DB_CNTRL_OFF)" >>is used, >> >>static int amd_gpio_irq_set_type(struct irq_data *d, unsigned int type) >>{ >> >>     ... >>     case IRQ_TYPE_LEVEL_LOW: >>         pin_reg |= LEVEL_TRIGGER << LEVEL_TRIG_OFF; >>         pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF); >>         pin_reg |= ACTIVE_LOW << ACTIVE_LEVEL_OFF; >>         pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF); >>         pin_reg |= DB_TYPE_PRESERVE_HIGH_GLITCH << DB_CNTRL_OFF; >>         irq_set_handler_locked(d, handle_level_irq); >>         break; >>     ... >>} >> >>If "pin_reg & ~DB_CNTRl_MASK" is used instead, the touchpad will work >>flawlessly. So I believe "pin_reg & ~DB_CNTRl_MASK" is the correct way >>to mask out the debouncing filter and the bug lies in amd_gpio_set_type. > >I'm afraid that that is not the case, the current code is correct, >it clears bit 5 and 6 of the register which are the bits which control >the debounce type. > Thank you for the explanation. As mentioned in another email (that email was supposed to be delivered much yesterday, but I forgot to run msmtp-runqueue.sh to send offline emails), this hack led to some issues. So it must be amd_gpio_set_debounce that makes the mistake of incorrectly masking out the bits of controlling the debounce type. Btw, amd_gpio_set_debounce seems to be never used because "struct acpi_gpio_info" doesn't has the debounce_timeout field. So the bug has never been exposed. >You mentioned in an earlier mail that the value of the register is >0x500e8 before this function runs. > >If you drop the "<< DB_CNTRL_OFF" part then instead you are masking out >bits 0 and 1 which are already 0, so the mask becomes a no-op. > >>Btw, can you explain what's the difference between glitch filter and >>debouncing filter? > >There is no difference the driver mixes the terms, but they both refer >to the same thing this is most clear in the defines for the DB_CNTRL bits >(bits 5 and 6 of the register): > >#define DB_TYPE_NO_DEBOUNCE 0x0UL >#define DB_TYPE_PRESERVE_LOW_GLITCH 0x1UL >#define DB_TYPE_PRESERVE_HIGH_GLITCH 0x2UL >#define DB_TYPE_REMOVE_GLITCH 0x3UL > Thank you for the clarification! This makes it much easier to understanding the behaviour of the GPIO controller. >Which is interesting because bits 5 and 6 are both 1 as set by the BIOS, >so with your little hack to dro the "<< DB_CNTRL_OFF" you are in essence >keeping bits 5 and 6 as DB_TYPE_REMOVE_GLITCH. > But the line before the hacked line is, pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF); which will mask out bits 5 and 6. So my little hack essentially disables the glitch filter. >So it seems that the problem is that the irq_set_type code changes >the glitch filter type from DB_TYPE_REMOVE_GLITCH (filter out all >glitches) to DB_TYPE_PRESERVE_HIGH_GLITCH, which apperently breaks >things. > >To test this you could replace the: > >DB_TYPE_PRESERVE_HIGH_GLITCH > >bit in the case IRQ_TYPE_LEVEL_LOW path with: > >DB_TYPE_REMOVE_GLITCH > >Which I would expect to also fix your touchpad. > Changing to DB_TYPE_REMOVE_GLITCH doesn't completely fix the touchpad. The touchpad is not as sensitive as the hack of disabling the glitch filter, for example, often two fingers touching will trigger right-mouse action. hid-recorder shows there are duplicate HID reports being received. However, if I set the debounce timeout to be 610us, the touchpad would work flawlessly and no issue of duplicate HID reports. >If that is the case an interesting experiment would be to >replace DB_TYPE_PRESERVE_HIGH_GLITCH with >DB_TYPE_PRESERVE_LOW_GLITCH instead. > Changing to DB_TYPE_PRESERVE_LOW_GLITCH could save the touchpad. Although hid-recorder shows there are also duplicate HID reports, but the touchpad work flawlessly (at least I couldn't notice any problem). I also did other experiments and found if we use DB_TYPE_PRESERVE_HIGH_GLITCH but set the debounce timeout to 610us, this could save the touchpad. Btw, based on on the code of set_debounce, I calculated the debounce timeout set by the BIOS and found the value is 124.8ms. This may explain why ~7 interrupts are fired when DB_TYPE_PRESERVE_HIGH_GLITCH is used. I tried to come up with a minimum set of rules to explain all observations about this GPIO controller, - the read value from the register equal to the written value written to the register - when the touchpad sends signal through its interrupt line to indicate arrival of new data, there are multiple cycles of signal debouncing, i.e., spurious interrupts would fired - When the debounce timeout is set, the GPIO chip will wait for specified time to collect enough data to judge if this is a valid signal thus eliminating spurious interrupts - DB_TYPE_PRESERVE_HIGH_GLITCH is for filtering high input while DB_TYPE_PRESERVE_LOW_GLITCH for filtering low input but obviously the above set of rules could not explain, - when debounce filter is disabled, no duplicate HID reports read by hid-recorder which indicates no spurious interrupts - with DB_TYPE_REMOVE_GLITCH and the default debounce timeout of 124.8ms, the interrupt fires at a much higher rate than 7Hz >I've never seen this kinda glitch/debounce filter where >you can filter out only one type of level before, so >I wonder if the code maybe simply got it wrong, also for >a level type irq I really see no objection to just >use DB_TYPE_REMOVE_GLITCH instead of the weird "half" >filters. > >So I just ran a git blame and the DB_TYPE_PRESERVE_HIGH_GLITCH >has been there from the very first commit of this driver, >I wonder if it has been wrong all this time and should be >inverted (so DB_TYPE_PRESERVE_LOW_GLITCH instead). > >I think we may want to just play it safe though and simply >switch to DB_TYPE_REMOVE_GLITCH as we already do for all >edge types and when amd_gpio_set_config() gets called! > >Linus, what do you think about just switching to >DB_TYPE_REMOVE_GLITCH for level type irqs (unifying them >with all the other modes) and not mucking with this weird, >undocumented "half" filter modes ? > >>Or can you point to some references? I've gain some >>experience about how to configure the GPIO controller by studying the >>code of pinctrl-amd and pinctrl-baytrail (I can't find the hardware >>reference manual for baytrail either). I also tweaked the configuration >>in pinctrl-amd, for example, setting the debounce timeout to 976 usec >>and 3.9 msec without disabling the glitch filter could also save the >>touchpad. But I need some knowledge to understand why this touchpad [1] >>which also uses the buggy pinctrl-amd isn't affected. >> >>[1] https://github.com/Syniurge/i2c-amd-mp2/issues/11#issuecomment-707427095 > >My guess would be that it uses edge types interrupts instead ? >I have seen that quite a few times, even though it is weird >to do that for i2c devices. > >Regards, > >Hans > -- Best regards, Coiby From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.3 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 45537C433DF for ; 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