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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EAAD7C433EF for ; Fri, 15 Apr 2022 21:12:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1353572AbiDOVPT (ORCPT ); Fri, 15 Apr 2022 17:15:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53720 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244735AbiDOVPE (ORCPT ); Fri, 15 Apr 2022 17:15:04 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EB2071BE92; Fri, 15 Apr 2022 14:12:34 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 85FBB620BE; Fri, 15 Apr 2022 21:12:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 270F7C385A5; Fri, 15 Apr 2022 21:12:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1650057153; bh=S1eI5dmq775LCayHMx3N/pfPBenUwajWdt1s32ub72A=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=K1VZwuH7MkPb3eAokvmvG8/+fCa6eSxfTr8BBnOGXaCwICqPt8YBNxrkm3ssSXwPi GKQVr6OXxjWF2aEYUUk+XDwU2fguct5d7LOF4E74oEyc/P8lxF7qIdrLy4FV5VDQ5e VbL6/AYJmLSTib8bYYxzlQfRLhEz+0z6QN5D559XZ7+TEZKbfh/5Ax27hA8dkF7Qko 4t3KA/uqSMJvCOoSZnc2geB2qK7n25wWoaGmz3Fiy474jtdnMbqsWNcomnEXwOaggc QT7g9uKlozIB0Jz1J0mSS6sWMINxMCAWNVZg4ponL+V05da4eo4H5CJ+cwcKiM+QC9 YrmFs/7YOnS/Q== Date: Fri, 15 Apr 2022 23:12:28 +0200 From: Wolfram Sang To: Martin =?utf-8?Q?Povi=C5=A1er?= Cc: Hector Martin , Sven Peter , Michael Ellerman , Alyssa Rosenzweig , Benjamin Herrenschmidt , Paul Mackerras , Jean Delvare , Olof Johansson , linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, Janne Grunau Subject: Re: [PATCH] i2c: pasemi: Wait for write xfers to finish Message-ID: Mail-Followup-To: Wolfram Sang , Martin =?utf-8?Q?Povi=C5=A1er?= , Hector Martin , Sven Peter , Michael Ellerman , Alyssa Rosenzweig , Benjamin Herrenschmidt , Paul Mackerras , Jean Delvare , Olof Johansson , linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, Janne Grunau References: <20220329183817.21656-1-povik+lin@cutebit.org> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="h21sbJa9/A5zZIHK" Content-Disposition: inline In-Reply-To: <20220329183817.21656-1-povik+lin@cutebit.org> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --h21sbJa9/A5zZIHK Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Mar 29, 2022 at 08:38:17PM +0200, Martin Povi=C5=A1er wrote: > Wait for completion of write transfers before returning from the driver. > At first sight it may seem advantageous to leave write transfers queued > for the controller to carry out on its own time, but there's a couple of > issues with it: >=20 > * Driver doesn't check for FIFO space. >=20 > * The queued writes can complete while the driver is in its I2C read > transfer path which means it will get confused by the raising of > XEN (the 'transaction ended' signal). This can cause a spurious > ENODATA error due to premature reading of the MRXFIFO register. >=20 > Adding the wait fixes some unreliability issues with the driver. There's > some efficiency cost to it (especially with pasemi_smb_waitready doing > its polling), but that will be alleviated once the driver receives > interrupt support. >=20 > Fixes: beb58aa39e6e ("i2c: PA Semi SMBus driver") > Signed-off-by: Martin Povi=C5=A1er Applied to for-current, thanks! --h21sbJa9/A5zZIHK Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEOZGx6rniZ1Gk92RdFA3kzBSgKbYFAmJZ37wACgkQFA3kzBSg KbZQYBAAiTUhdwY7QAuznZSfhNwuVynUucrnWrVKfFiiZWjtxraHqVHG0lN0Mz0I v56ZVw9aBFtCcK/FaipcGLOm/7JPnIJEovhp7Gjq73BImwBQ/ox/SZ0YQ2uGgt7v JxGzwpUrInswF6+DL9XpoHBcAEr35BXZ2ZGIb6GbuV/Jalj7BldDCWxHB1O4gsUL yhDhnj1bmNVG+zzHAHG6nr/ZX8QJk6dm1JvV9W4MlvmRugDRciBLACsNqf4Ffw48 eTdKxGBbDmjPNnYtUplgVV2SZw1uo7lrQLhVHvkcJhE3F9G8InygwWYrmKAMx3ye TdYI96LNyvTu5C8NQe/+qQCijogwVNm7ZpyXSZ42nciBqdq/1WkiS615cLW5GkVX x27uKGhldwMUfcr2b4PB8R6rh7OxM9Y/cp3P4+R40fHnrR0y4Ip06BaOhKhn8R6O kLu/ZuqZ3PhgIelJTE7rnY04FAWcrHHv8PrIClmKgzhWee1WhWmyDfZ2lWJ4UJLs E/zHma87dnykwAJtUmBIobXle/SZqfUYyrUq0BfGFYlIwQwPxwUVkxrIdS9P9wYg LG/gy4fD757d3BOQTcYhfzhx/BO7IeCkJEO8GXrHkiUZ92ymy372FUZH+2SHoIyy HhVFfV6BjTS4A+CAEKVZZ94+S/J1U+kKPUE3R300kMh2FONXNcw= =47X8 -----END PGP SIGNATURE----- --h21sbJa9/A5zZIHK-- 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 lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (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 95D73C433F5 for ; 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Sat, 16 Apr 2022 07:12:38 +1000 (AEST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sin.source.kernel.org (Postfix) with ESMTPS id 6AE5ECE300F; Fri, 15 Apr 2022 21:12:35 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 270F7C385A5; Fri, 15 Apr 2022 21:12:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1650057153; bh=S1eI5dmq775LCayHMx3N/pfPBenUwajWdt1s32ub72A=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=K1VZwuH7MkPb3eAokvmvG8/+fCa6eSxfTr8BBnOGXaCwICqPt8YBNxrkm3ssSXwPi GKQVr6OXxjWF2aEYUUk+XDwU2fguct5d7LOF4E74oEyc/P8lxF7qIdrLy4FV5VDQ5e VbL6/AYJmLSTib8bYYxzlQfRLhEz+0z6QN5D559XZ7+TEZKbfh/5Ax27hA8dkF7Qko 4t3KA/uqSMJvCOoSZnc2geB2qK7n25wWoaGmz3Fiy474jtdnMbqsWNcomnEXwOaggc QT7g9uKlozIB0Jz1J0mSS6sWMINxMCAWNVZg4ponL+V05da4eo4H5CJ+cwcKiM+QC9 YrmFs/7YOnS/Q== Date: Fri, 15 Apr 2022 23:12:28 +0200 From: Wolfram Sang To: Martin =?utf-8?Q?Povi=C5=A1er?= Subject: Re: [PATCH] i2c: pasemi: Wait for write xfers to finish Message-ID: Mail-Followup-To: Wolfram Sang , Martin =?utf-8?Q?Povi=C5=A1er?= , Hector Martin , Sven Peter , Michael Ellerman , Alyssa Rosenzweig , Benjamin Herrenschmidt , Paul Mackerras , Jean Delvare , Olof Johansson , linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, Janne Grunau References: <20220329183817.21656-1-povik+lin@cutebit.org> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="h21sbJa9/A5zZIHK" Content-Disposition: inline In-Reply-To: <20220329183817.21656-1-povik+lin@cutebit.org> X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sven Peter , Hector Martin , linux-kernel@vger.kernel.org, Olof Johansson , Paul Mackerras , linux-arm-kernel@lists.infradead.org, Jean Delvare , Janne Grunau , linuxppc-dev@lists.ozlabs.org, Alyssa Rosenzweig , linux-i2c@vger.kernel.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" --h21sbJa9/A5zZIHK Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Mar 29, 2022 at 08:38:17PM +0200, Martin Povi=C5=A1er wrote: > Wait for completion of write transfers before returning from the driver. > At first sight it may seem advantageous to leave write transfers queued > for the controller to carry out on its own time, but there's a couple of > issues with it: >=20 > * Driver doesn't check for FIFO space. >=20 > * The queued writes can complete while the driver is in its I2C read > transfer path which means it will get confused by the raising of > XEN (the 'transaction ended' signal). This can cause a spurious > ENODATA error due to premature reading of the MRXFIFO register. >=20 > Adding the wait fixes some unreliability issues with the driver. There's > some efficiency cost to it (especially with pasemi_smb_waitready doing > its polling), but that will be alleviated once the driver receives > interrupt support. >=20 > Fixes: beb58aa39e6e ("i2c: PA Semi SMBus driver") > Signed-off-by: Martin Povi=C5=A1er Applied to for-current, thanks! --h21sbJa9/A5zZIHK Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEOZGx6rniZ1Gk92RdFA3kzBSgKbYFAmJZ37wACgkQFA3kzBSg KbZQYBAAiTUhdwY7QAuznZSfhNwuVynUucrnWrVKfFiiZWjtxraHqVHG0lN0Mz0I v56ZVw9aBFtCcK/FaipcGLOm/7JPnIJEovhp7Gjq73BImwBQ/ox/SZ0YQ2uGgt7v JxGzwpUrInswF6+DL9XpoHBcAEr35BXZ2ZGIb6GbuV/Jalj7BldDCWxHB1O4gsUL yhDhnj1bmNVG+zzHAHG6nr/ZX8QJk6dm1JvV9W4MlvmRugDRciBLACsNqf4Ffw48 eTdKxGBbDmjPNnYtUplgVV2SZw1uo7lrQLhVHvkcJhE3F9G8InygwWYrmKAMx3ye TdYI96LNyvTu5C8NQe/+qQCijogwVNm7ZpyXSZ42nciBqdq/1WkiS615cLW5GkVX x27uKGhldwMUfcr2b4PB8R6rh7OxM9Y/cp3P4+R40fHnrR0y4Ip06BaOhKhn8R6O kLu/ZuqZ3PhgIelJTE7rnY04FAWcrHHv8PrIClmKgzhWee1WhWmyDfZ2lWJ4UJLs E/zHma87dnykwAJtUmBIobXle/SZqfUYyrUq0BfGFYlIwQwPxwUVkxrIdS9P9wYg LG/gy4fD757d3BOQTcYhfzhx/BO7IeCkJEO8GXrHkiUZ92ymy372FUZH+2SHoIyy HhVFfV6BjTS4A+CAEKVZZ94+S/J1U+kKPUE3R300kMh2FONXNcw= =47X8 -----END PGP SIGNATURE----- --h21sbJa9/A5zZIHK-- 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 2A221C433EF for ; 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Fri, 15 Apr 2022 21:12:45 +0000 Received: from sin.source.kernel.org ([145.40.73.55]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nfTFA-00BLGw-GQ for linux-arm-kernel@lists.infradead.org; Fri, 15 Apr 2022 21:12:42 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sin.source.kernel.org (Postfix) with ESMTPS id 6AE5ECE300F; Fri, 15 Apr 2022 21:12:35 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 270F7C385A5; Fri, 15 Apr 2022 21:12:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1650057153; bh=S1eI5dmq775LCayHMx3N/pfPBenUwajWdt1s32ub72A=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=K1VZwuH7MkPb3eAokvmvG8/+fCa6eSxfTr8BBnOGXaCwICqPt8YBNxrkm3ssSXwPi GKQVr6OXxjWF2aEYUUk+XDwU2fguct5d7LOF4E74oEyc/P8lxF7qIdrLy4FV5VDQ5e VbL6/AYJmLSTib8bYYxzlQfRLhEz+0z6QN5D559XZ7+TEZKbfh/5Ax27hA8dkF7Qko 4t3KA/uqSMJvCOoSZnc2geB2qK7n25wWoaGmz3Fiy474jtdnMbqsWNcomnEXwOaggc QT7g9uKlozIB0Jz1J0mSS6sWMINxMCAWNVZg4ponL+V05da4eo4H5CJ+cwcKiM+QC9 YrmFs/7YOnS/Q== Date: Fri, 15 Apr 2022 23:12:28 +0200 From: Wolfram Sang To: Martin =?utf-8?Q?Povi=C5=A1er?= Cc: Hector Martin , Sven Peter , Michael Ellerman , Alyssa Rosenzweig , Benjamin Herrenschmidt , Paul Mackerras , Jean Delvare , Olof Johansson , linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, Janne Grunau Subject: Re: [PATCH] i2c: pasemi: Wait for write xfers to finish Message-ID: Mail-Followup-To: Wolfram Sang , Martin =?utf-8?Q?Povi=C5=A1er?= , Hector Martin , Sven Peter , Michael Ellerman , Alyssa Rosenzweig , Benjamin Herrenschmidt , Paul Mackerras , Jean Delvare , Olof Johansson , linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, Janne Grunau References: <20220329183817.21656-1-povik+lin@cutebit.org> MIME-Version: 1.0 In-Reply-To: <20220329183817.21656-1-povik+lin@cutebit.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220415_141240_968247_377173B5 X-CRM114-Status: GOOD ( 17.26 ) 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: multipart/mixed; boundary="===============9068007914690512571==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============9068007914690512571== Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="h21sbJa9/A5zZIHK" Content-Disposition: inline --h21sbJa9/A5zZIHK Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Mar 29, 2022 at 08:38:17PM +0200, Martin Povi=C5=A1er wrote: > Wait for completion of write transfers before returning from the driver. > At first sight it may seem advantageous to leave write transfers queued > for the controller to carry out on its own time, but there's a couple of > issues with it: >=20 > * Driver doesn't check for FIFO space. >=20 > * The queued writes can complete while the driver is in its I2C read > transfer path which means it will get confused by the raising of > XEN (the 'transaction ended' signal). This can cause a spurious > ENODATA error due to premature reading of the MRXFIFO register. >=20 > Adding the wait fixes some unreliability issues with the driver. There's > some efficiency cost to it (especially with pasemi_smb_waitready doing > its polling), but that will be alleviated once the driver receives > interrupt support. >=20 > Fixes: beb58aa39e6e ("i2c: PA Semi SMBus driver") > Signed-off-by: Martin Povi=C5=A1er Applied to for-current, thanks! --h21sbJa9/A5zZIHK Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEOZGx6rniZ1Gk92RdFA3kzBSgKbYFAmJZ37wACgkQFA3kzBSg KbZQYBAAiTUhdwY7QAuznZSfhNwuVynUucrnWrVKfFiiZWjtxraHqVHG0lN0Mz0I v56ZVw9aBFtCcK/FaipcGLOm/7JPnIJEovhp7Gjq73BImwBQ/ox/SZ0YQ2uGgt7v JxGzwpUrInswF6+DL9XpoHBcAEr35BXZ2ZGIb6GbuV/Jalj7BldDCWxHB1O4gsUL yhDhnj1bmNVG+zzHAHG6nr/ZX8QJk6dm1JvV9W4MlvmRugDRciBLACsNqf4Ffw48 eTdKxGBbDmjPNnYtUplgVV2SZw1uo7lrQLhVHvkcJhE3F9G8InygwWYrmKAMx3ye TdYI96LNyvTu5C8NQe/+qQCijogwVNm7ZpyXSZ42nciBqdq/1WkiS615cLW5GkVX x27uKGhldwMUfcr2b4PB8R6rh7OxM9Y/cp3P4+R40fHnrR0y4Ip06BaOhKhn8R6O kLu/ZuqZ3PhgIelJTE7rnY04FAWcrHHv8PrIClmKgzhWee1WhWmyDfZ2lWJ4UJLs E/zHma87dnykwAJtUmBIobXle/SZqfUYyrUq0BfGFYlIwQwPxwUVkxrIdS9P9wYg LG/gy4fD757d3BOQTcYhfzhx/BO7IeCkJEO8GXrHkiUZ92ymy372FUZH+2SHoIyy HhVFfV6BjTS4A+CAEKVZZ94+S/J1U+kKPUE3R300kMh2FONXNcw= =47X8 -----END PGP SIGNATURE----- --h21sbJa9/A5zZIHK-- --===============9068007914690512571== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel --===============9068007914690512571==--