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[92.40.171.44]) by smtp.gmail.com with ESMTPSA id n14-20020a5d67ce000000b0021b89c07b6asm406757wrw.108.2022.06.23.13.53.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 23 Jun 2022 13:53:32 -0700 (PDT) References: <20220620200644.1961936-1-aidanmacdonald.0x0@gmail.com> <20220620200644.1961936-16-aidanmacdonald.0x0@gmail.com> From: Aidan MacDonald To: Andy Shevchenko Cc: Mark Brown , Andy Gross , Bjorn Andersson , Srinivas Kandagatla , Banajit Goswami , Greg Kroah-Hartman , "Rafael J. Wysocki" , Chanwoo Choi , Krzysztof Kozlowski , Bartlomiej Zolnierkiewicz , MyungJoo Ham , Michael Walle , Linus Walleij , Bartosz Golaszewski , Thomas Gleixner , Marc Zyngier , Lee Jones , Manivannan Sadhasivam , Cristian Ciocaltea , Chen-Yu Tsai , "tharvey@gateworks.com" , "rjones@gateworks.com" , Matti Vaittinen , "orsonzhai@gmail.com" , "baolin.wang7@gmail.com" , "zhang.lyra@gmail.com" , Jernej Skrabec , Samuel Holland , Liam Girdwood , Jaroslav Kysela , Takashi Iwai , Linux Kernel Mailing List , "open list:GPIO SUBSYSTEM" , "linux-actions@lists.infradead.org" , linux-arm-msm , linux-arm Mailing List , "linux-sunxi@lists.linux.dev" , ALSA Development Mailing List Subject: Re: [PATCH 15/49] regmap-irq: Change the behavior of mask_writeonly In-reply-to: Date: Thu, 23 Jun 2022 21:54:37 +0100 Message-ID: <8qRxwIYmbvte9HM2KVfkdhwPpeZ7oY9s@localhost> Precedence: bulk X-Mailing-List: linux-sunxi@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Andy Shevchenko writes: > On Tuesday, June 21, 2022, Aidan MacDonald = wrote: >> Andy Shevchenko writes: >> >> > On Mon, Jun 20, 2022 at 10:08 PM Aidan MacDonald >> > wrote: >> >> >> >> No drivers currently use mask_writeonly, and in its current form >> >> it seems a bit misleading. When set, mask registers will be >> >> updated with regmap_write_bits() instead of regmap_update_bits(), >> >> but regmap_write_bits() still does a read-modify-write under the >> >> hood. It's not a write-only operation. >> >> >> >> Performing a simple regmap_write() is probably more useful, since >> >> it can be used for chips that have separate set & clear registers >> >> for controlling mask bits. Such registers are normally volatile >> >> and read as 0, so avoiding a register read minimizes bus traffic. >> > >> > Reading your explanations and the code, I would rather think about >> > fixing the regmap_write_bits() to be writeonly op. >> >> That's impossible without special hardware support. >> >> > Otherwise it's unclear what's the difference between >> > regmap_write_bits() vs. regmap_update_bits(). >> >> This was not obvious to me either. They're the same except in how they >> issue the low-level write op -- regmap_update_bits() will only do the >> write if the new value differs from the current one. regmap_write_bits() >> will always do a write, even if the new value is the same. > > Okay, it makes a lot of sense for W1C type of bits in the register. > Also, =E2=80=9Creading=E2=80=9D might imply to restore last value from ca= che, no? Maybe there needs to be some explanation of what the typical use case is and why you'd choose write_bits() over update_bits(), because the more I think about it the less clear it is. You're right that the read could be served from a cache. But I'm not sure if a cache would be safe if even one bit in the register is volatile, and I can't really see a use case for write_bits() that doesn't involve volatile behavior of some sort. In any event, I'm just going to drop this patch and the related driver patches in favor of removing mask_writeonly entirely, since it looks like it was never used, and after thinking about it I'm not sure what I did helps much. If some driver needs write_bits() for mask registers down the road it's not a big deal to add this back. >> I think the problem is lack of documentation. I only figured this out >> by reading the implementation. >> >> >> if (d->chip->mask_writeonly) >> >> - return regmap_write_bits(d->map, reg, mask, val); >> >> + return regmap_write(d->map, reg, val & mask); >> >> else >> >> return regmap_update_bits(d->map, reg, mask, val); 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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1A11EC433EF for ; Thu, 23 Jun 2022 20:54:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date: In-reply-to:Subject:Cc:To:From:References:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=UVN40cU9f7cAXx98HmQO2rbezE3K+KS5NB2GiG6upVo=; b=U8SHUDdO2CKSL1ruAzRzqhkCDD c5gnqQLGyLdKiuxrb3pA3TlFt/MeJip3Bilwl/ECi9Bzon6Gs6WuZWLUxry5B66idZ4MBh0x5ydmx fXFFne2V+PeEn7nLghwf1Vwab+N9gzZixUKX/VPMQTGIC9NkXUFkoElJ9QnD8mzalc3Y/ombNWnDh nRpx7XiAd719JLZUsNzBLJ2oz3FGlpoGuznJimAkij6j0zgjIoT2GX6/2KsT5+Pic8JLV6YfGC3mo 4/jDbCzD1eLMlP36DDpjCkwpwTM1DRyIfZISO/E4Swe9sDONHV27xhoWrXQP+qkmypC3tXtoRzQu7 kVhIIGDA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1o4Tpe-00Gnpe-2P; Thu, 23 Jun 2022 20:53:42 +0000 Received: from mail-wm1-x334.google.com ([2a00:1450:4864:20::334]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1o4Tpa-00Gnlo-0M; Thu, 23 Jun 2022 20:53:39 +0000 Received: by mail-wm1-x334.google.com with SMTP id u12-20020a05600c210c00b003a02b16d2b8so400986wml.2; Thu, 23 Jun 2022 13:53:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=references:from:to:cc:subject:in-reply-to:date:message-id :mime-version:content-transfer-encoding; bh=uR19dUJmcNaxBwdM2oTyzNVaO2KBzPX6s9JgcdgMii0=; b=ij55DIpBjm/hJbjc0ntL8Q2eWnzNJC2eDhKfxvV1EykMihvHpPJDo3uD/32lOcvKvF +Nub1SNXWszsbsqNrrOZywFANBPl6ZQxpN+ByL6OCsk5SheLF4ClaATXOY2xs7A0cBlg JAh8CpZNLrm1wTf/ZyU42B38HdJvGMfVTdfI7NPHrngS9uVghyow7eDum8QPsJURP/lm nGsgFVuP5u+Sj/fy1JQvRyFUTWu4ChJBQh70+mErYPMicSVDCWeFZv0Qmp42+DP8RQWH 37PqXCX0mjI5Ww40jRdGzUjybml3+Zz/VJod3AczUP5t0Ncdc/pVDM3foOeWPsbmZdmU YUEg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:references:from:to:cc:subject:in-reply-to:date :message-id:mime-version:content-transfer-encoding; bh=uR19dUJmcNaxBwdM2oTyzNVaO2KBzPX6s9JgcdgMii0=; b=FAQ4cFY6hMfYqDInwtlRaE8BFlvF/cDf2h6MAP5g7fPgPrgpKsyj+dZJZAhnVggn1n LVbtgafGc3bZJz7VSDPaFyEXew6Dima0RnN6eY5l7aGP/8lqQ28EoRzulGHbxZFLchPy tC/7m5DgtDcAHvPYJe6Vvl8MHhVkA+2s1GW2A7a1XzdyYaE+vQjd01FfaZBefImPjQlk IS5hbKxi/ep+OnaJ4fT28UgjQibFBXFAciS/Si1pFlglsEXHavM+lyfnRcTvoqpSE0ge 64dxbFdTUE3GGn5eyV3yksKjpjwPz+01LmbiZII+hu84XGJoPRnDPSz77csIc6rlRxIB OEDA== X-Gm-Message-State: AJIora8FhwYbNTNwInWYeL7Q/LHIvwNQmMXICIZIGHYSroCEhoHny7vb ErvCsUXaE1EFxMFjakSaTYg= X-Google-Smtp-Source: AGRyM1tIBcbqqjiLWicrbHaR6vX8/2L6/5uVJuB9R6VbK4sR7Y33O50Sc4VbODYyYuYA5cMC0BoYeA== X-Received: by 2002:a05:600c:4f15:b0:39c:7eaf:97e7 with SMTP id l21-20020a05600c4f1500b0039c7eaf97e7mr6415694wmq.199.1656017612752; Thu, 23 Jun 2022 13:53:32 -0700 (PDT) Received: from localhost (92.40.171.44.threembb.co.uk. [92.40.171.44]) by smtp.gmail.com with ESMTPSA id n14-20020a5d67ce000000b0021b89c07b6asm406757wrw.108.2022.06.23.13.53.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 23 Jun 2022 13:53:32 -0700 (PDT) References: <20220620200644.1961936-1-aidanmacdonald.0x0@gmail.com> <20220620200644.1961936-16-aidanmacdonald.0x0@gmail.com> From: Aidan MacDonald To: Andy Shevchenko Cc: Mark Brown , Andy Gross , Bjorn Andersson , Srinivas Kandagatla , Banajit Goswami , Greg Kroah-Hartman , "Rafael J. Wysocki" , Chanwoo Choi , Krzysztof Kozlowski , Bartlomiej Zolnierkiewicz , MyungJoo Ham , Michael Walle , Linus Walleij , Bartosz Golaszewski , Thomas Gleixner , Marc Zyngier , Lee Jones , Manivannan Sadhasivam , Cristian Ciocaltea , Chen-Yu Tsai , "tharvey@gateworks.com" , "rjones@gateworks.com" , Matti Vaittinen , "orsonzhai@gmail.com" , "baolin.wang7@gmail.com" , "zhang.lyra@gmail.com" , Jernej Skrabec , Samuel Holland , Liam Girdwood , Jaroslav Kysela , Takashi Iwai , Linux Kernel Mailing List , "open list:GPIO SUBSYSTEM" , "linux-actions@lists.infradead.org" , linux-arm-msm , linux-arm Mailing List , "linux-sunxi@lists.linux.dev" , ALSA Development Mailing List Subject: Re: [PATCH 15/49] regmap-irq: Change the behavior of mask_writeonly In-reply-to: Date: Thu, 23 Jun 2022 21:54:37 +0100 Message-ID: <8qRxwIYmbvte9HM2KVfkdhwPpeZ7oY9s@localhost> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220623_135338_096268_296EABBC X-CRM114-Status: GOOD ( 27.94 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; 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