From patchwork Thu Mar 16 15:57:33 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Charles Keepax X-Patchwork-Id: 664009 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 alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (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 EA7C7C7618B for ; Thu, 16 Mar 2023 15:59:04 +0000 (UTC) Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id 1DFAD10DA; Thu, 16 Mar 2023 16:58:12 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 1DFAD10DA DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1678982342; bh=wh2ncfWA9fsUStaeuBhB1EgIxUEL0K6LB8MRtJYYzks=; h=To:Subject:Date:List-Id:List-Archive:List-Help:List-Owner: List-Post:List-Subscribe:List-Unsubscribe:From:Reply-To:Cc:From; b=VAyTzUJ8noWvlbezLxve1WBJHfJSUbU+MPz22M+2wHbywuRRpFyHlmADvu1BlL9VM Uvx8b8yq9LWHNI7TzGsgHcXfrk1llOPoE5H09joot4dEqHZ3aXHbFAJKReukRv0SAA 5LaR5IGdpDGNMKk8iUfy8JAz4CrOnguDMKlG0+zE= Received: from mailman-core.alsa-project.org (mailman-core.alsa-project.org [10.254.200.10]) by alsa1.perex.cz (Postfix) with ESMTP id 8C5ACF80423; Thu, 16 Mar 2023 16:57:50 +0100 (CET) To: Subject: [PATCH 1/2] soundwire: bus: Remove now outdated comments on no_pm IO Date: Thu, 16 Mar 2023 15:57:33 +0000 X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.8 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <167898226908.26.506808194693360278@mailman-core.alsa-project.org> X-Patchwork-Original-From: Charles Keepax via Alsa-devel From: Charles Keepax Reply-To: Charles Keepax Cc: yung-chuan.liao@linux.intel.com, pierre-louis.bossart@linux.intel.com, sanyog.r.kale@intel.com, alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, patches@opensource.cirrus.com Content-Disposition: inline Things have moved more towards end drivers using the no_pm versions of the IO functions. See commits: commit 167790abb90f ("soundwire: export sdw_write/read_no_pm functions") commit 62dc9f3f2fd0 ("soundwire: bus: export sdw_nwrite_no_pm and sdw_nread_no_pm functions") As such this comment is now misleading, so remove it. Signed-off-by: Charles Keepax --- drivers/soundwire/bus.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c index b6aca59c31300..3c67266f94834 100644 --- a/drivers/soundwire/bus.c +++ b/drivers/soundwire/bus.c @@ -384,9 +384,6 @@ int sdw_fill_msg(struct sdw_msg *msg, struct sdw_slave *slave, /* * Read/Write IO functions. - * no_pm versions can only be called by the bus, e.g. while enumerating or - * handling suspend-resume sequences. - * all clients need to use the pm versions */ int sdw_nread_no_pm(struct sdw_slave *slave, u32 addr, size_t count, u8 *val) From patchwork Thu Mar 16 15:57:34 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Charles Keepax X-Patchwork-Id: 664564 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 alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (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 91DE7C7618B for ; Thu, 16 Mar 2023 15:59:34 +0000 (UTC) Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id A41EA10E9; Thu, 16 Mar 2023 16:58:41 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz A41EA10E9 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1678982371; bh=+NIXVypj3mPSjYmkKruxPPpCcGhKjct/8+Amql9AO48=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Archive: List-Help:List-Owner:List-Post:List-Subscribe:List-Unsubscribe: From:Reply-To:Cc:From; b=QPDC3OVpxCDc2EhfhiVPuXEsrkbjrdbQNgFjBvPzXWh+APaIX/75vuZCUKFRb4wb6 VxbGqEJN+9caeO1K2zltLm7Sd0Q5Vb2sSd9xS4TIxc50YvCXs5g4DWQ+rk3TXvwhST Ovev7JgmUHPHNTUhE3BCsFOBHPUq0e+dZJa9CRwU= Received: from mailman-core.alsa-project.org (mailman-core.alsa-project.org [10.254.200.10]) by alsa1.perex.cz (Postfix) with ESMTP id 9BC0DF804FE; Thu, 16 Mar 2023 16:57:52 +0100 (CET) To: Subject: [PATCH 2/2] soundwire: bus: Update sdw_nread/nwrite_no_pm to handle page boundaries Date: Thu, 16 Mar 2023 15:57:34 +0000 In-Reply-To: <20230316155734.3191577-1-ckeepax@opensource.cirrus.com> References: <20230316155734.3191577-1-ckeepax@opensource.cirrus.com> X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.8 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <167898227099.26.9813853342986450785@mailman-core.alsa-project.org> X-Patchwork-Original-From: Charles Keepax via Alsa-devel From: Charles Keepax Reply-To: Charles Keepax Cc: yung-chuan.liao@linux.intel.com, pierre-louis.bossart@linux.intel.com, sanyog.r.kale@intel.com, alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, patches@opensource.cirrus.com Content-Disposition: inline Currently issuing a sdw_nread/nwrite_no_pm across a page boundary will silently fail to write correctly as nothing updates the page registers, meaning the same page of the chip will get rewritten with each successive page of data. As the sdw_msg structure contains page information it seems reasonable that a single sdw_msg should always be within one page. It is also mostly simpler to handle the paging at the bus level rather than each master having to handle it in their xfer_msg callback. As such add handling to the bus code to split up a transfer into multiple sdw_msg's when they go across page boundaries. Signed-off-by: Charles Keepax --- drivers/soundwire/bus.c | 47 +++++++++++++++++++++++------------------ 1 file changed, 26 insertions(+), 21 deletions(-) diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c index 3c67266f94834..bdd251e871694 100644 --- a/drivers/soundwire/bus.c +++ b/drivers/soundwire/bus.c @@ -386,37 +386,42 @@ int sdw_fill_msg(struct sdw_msg *msg, struct sdw_slave *slave, * Read/Write IO functions. */ -int sdw_nread_no_pm(struct sdw_slave *slave, u32 addr, size_t count, u8 *val) +static int sdw_ntransfer_no_pm(struct sdw_slave *slave, u32 addr, u8 flags, + size_t count, u8 *val) { struct sdw_msg msg; + size_t size; int ret; - ret = sdw_fill_msg(&msg, slave, addr, count, - slave->dev_num, SDW_MSG_FLAG_READ, val); - if (ret < 0) - return ret; + while (count) { + // Only handle bytes up to next page boundary + size = min(count, (SDW_REGADDR + 1) - (addr & SDW_REGADDR)); - ret = sdw_transfer(slave->bus, &msg); - if (slave->is_mockup_device) - ret = 0; - return ret; + ret = sdw_fill_msg(&msg, slave, addr, size, slave->dev_num, flags, val); + if (ret < 0) + return ret; + + ret = sdw_transfer(slave->bus, &msg); + if (ret < 0 && !slave->is_mockup_device) + return ret; + + addr += size; + val += size; + count -= size; + } + + return 0; +} + +int sdw_nread_no_pm(struct sdw_slave *slave, u32 addr, size_t count, u8 *val) +{ + return sdw_ntransfer_no_pm(slave, addr, SDW_MSG_FLAG_READ, count, val); } EXPORT_SYMBOL(sdw_nread_no_pm); int sdw_nwrite_no_pm(struct sdw_slave *slave, u32 addr, size_t count, const u8 *val) { - struct sdw_msg msg; - int ret; - - ret = sdw_fill_msg(&msg, slave, addr, count, - slave->dev_num, SDW_MSG_FLAG_WRITE, (u8 *)val); - if (ret < 0) - return ret; - - ret = sdw_transfer(slave->bus, &msg); - if (slave->is_mockup_device) - ret = 0; - return ret; + return sdw_ntransfer_no_pm(slave, addr, SDW_MSG_FLAG_WRITE, count, (u8 *)val); } EXPORT_SYMBOL(sdw_nwrite_no_pm);