From patchwork Tue Aug 18 02:41:20 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Liao, Bard" X-Patchwork-Id: 251383 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=-11.2 required=3.0 tests=BAYES_00, DATE_IN_PAST_06_12, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=unavailable 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 AE564C433DF for ; Tue, 18 Aug 2020 14:42:51 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 3E061207DA for ; Tue, 18 Aug 2020 14:42:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alsa-project.org header.i=@alsa-project.org header.b="t7Tnbw5x" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3E061207DA Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=alsa-devel-bounces@alsa-project.org Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id D1ACC1769; Tue, 18 Aug 2020 16:41:59 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz D1ACC1769 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1597761769; bh=VEWeXHW45HNwfkOyH+/Rn+5R5PisIwmeFWq1ozqm8BA=; h=From:To:Subject:Date:In-Reply-To:References:Cc:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=t7Tnbw5x9xolUogTXTItn+b+ENziqCePDhT4jd8DObDWwxvGhFx0M+B4oGafxKOdV G/BF0/g6VXL5grrINm3B8+RT1E0SbFpGQryARo24w9HX9c/eTV6nmAAFB27kmJBHlR z++/ccOp77zzNgJU3CELn0vHd5hrOFj0j5qYwPSQ= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id 6E8B1F8032A; Tue, 18 Aug 2020 16:36:05 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 43BDCF80323; Tue, 18 Aug 2020 16:36:02 +0200 (CEST) Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 2A1DDF80322 for ; Tue, 18 Aug 2020 16:35:58 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 2A1DDF80322 IronPort-SDR: 7uc6dLRZDJq0pYxWYoCjLAR3vWaAQCw/+nc1JRvY4cUG1skWUmcI9Wumfx5DEtTdAKYetsLmmt 3BzQ8A8xgF8A== X-IronPort-AV: E=McAfee;i="6000,8403,9716"; a="219223608" X-IronPort-AV: E=Sophos;i="5.76,327,1592895600"; d="scan'208";a="219223608" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Aug 2020 07:35:58 -0700 IronPort-SDR: pYASlFNwMd+E6GmvVY2K0hPj6X6RBKwWRPIgbELDlzpSI8BP2Gv2bFjzeOhMIX99aZ3keJVKEq bIv23cQ8RUSw== X-IronPort-AV: E=Sophos;i="5.76,327,1592895600"; d="scan'208";a="471830800" Received: from bard-ubuntu.sh.intel.com ([10.239.13.33]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Aug 2020 07:35:54 -0700 From: Bard Liao To: alsa-devel@alsa-project.org, vkoul@kernel.org Subject: [PATCH 11/11] soundwire: intel: don't manage link power individually Date: Tue, 18 Aug 2020 10:41:20 +0800 Message-Id: <20200818024120.20721-12-yung-chuan.liao@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200818024120.20721-1-yung-chuan.liao@linux.intel.com> References: <20200818024120.20721-1-yung-chuan.liao@linux.intel.com> Cc: pierre-louis.bossart@linux.intel.com, vinod.koul@linaro.org, tiwai@suse.de, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, ranjani.sridharan@linux.intel.com, hui.wang@canonical.com, broonie@kernel.org, srinivas.kandagatla@linaro.org, jank@cadence.com, mengdong.lin@intel.com, sanyog.r.kale@intel.com, rander.wang@linux.intel.com, bard.liao@intel.com X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" From: Pierre-Louis Bossart Each link has separate power controls, but experimental results show we need to use an all-or-none approach to the link power management. This change has marginal power impacts, the DSP needs to be powered anyways before SoundWire links can be powered, and even when powered a link can be in clock-stopped mode. Signed-off-by: Pierre-Louis Bossart Signed-off-by: Bard Liao --- drivers/soundwire/intel.c | 70 +++++++++++++++++++++++++-------------- 1 file changed, 46 insertions(+), 24 deletions(-) diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c index b82d02af3c4f..154aa7c0561a 100644 --- a/drivers/soundwire/intel.c +++ b/drivers/soundwire/intel.c @@ -63,7 +63,9 @@ MODULE_PARM_DESC(sdw_md_flags, "SoundWire Intel Master device flags (0x0 all off #define SDW_SHIM_WAKESTS 0x192 #define SDW_SHIM_LCTL_SPA BIT(0) +#define SDW_SHIM_LCTL_SPA_MASK GENMASK(3, 0) #define SDW_SHIM_LCTL_CPA BIT(8) +#define SDW_SHIM_LCTL_CPA_MASK GENMASK(11, 8) #define SDW_SHIM_SYNC_SYNCPRD_VAL_24 (24000 / SDW_CADENCE_GSYNC_KHZ - 1) #define SDW_SHIM_SYNC_SYNCPRD_VAL_38_4 (38400 / SDW_CADENCE_GSYNC_KHZ - 1) @@ -295,8 +297,8 @@ static int intel_link_power_up(struct sdw_intel *sdw) u32 *shim_mask = sdw->link_res->shim_mask; struct sdw_bus *bus = &sdw->cdns.bus; struct sdw_master_prop *prop = &bus->prop; - int spa_mask, cpa_mask; - int link_control; + u32 spa_mask, cpa_mask; + u32 link_control; int ret = 0; u32 syncprd; u32 sync_reg; @@ -319,6 +321,8 @@ static int intel_link_power_up(struct sdw_intel *sdw) syncprd = SDW_SHIM_SYNC_SYNCPRD_VAL_24; if (!*shim_mask) { + dev_dbg(sdw->cdns.dev, "%s: powering up all links\n", __func__); + /* we first need to program the SyncPRD/CPU registers */ dev_dbg(sdw->cdns.dev, "%s: first link up, programming SYNCPRD\n", __func__); @@ -331,21 +335,24 @@ static int intel_link_power_up(struct sdw_intel *sdw) /* Set SyncCPU bit */ sync_reg |= SDW_SHIM_SYNC_SYNCCPU; intel_writel(shim, SDW_SHIM_SYNC, sync_reg); - } - /* Link power up sequence */ - link_control = intel_readl(shim, SDW_SHIM_LCTL); - spa_mask = (SDW_SHIM_LCTL_SPA << link_id); - cpa_mask = (SDW_SHIM_LCTL_CPA << link_id); - link_control |= spa_mask; + /* Link power up sequence */ + link_control = intel_readl(shim, SDW_SHIM_LCTL); - ret = intel_set_bit(shim, SDW_SHIM_LCTL, link_control, cpa_mask); - if (ret < 0) { - dev_err(sdw->cdns.dev, "Failed to power up link: %d\n", ret); - goto out; - } + /* only power-up enabled links */ + spa_mask = sdw->link_res->link_mask << + SDW_REG_SHIFT(SDW_SHIM_LCTL_SPA_MASK); + cpa_mask = sdw->link_res->link_mask << + SDW_REG_SHIFT(SDW_SHIM_LCTL_CPA_MASK); + + link_control |= spa_mask; + + ret = intel_set_bit(shim, SDW_SHIM_LCTL, link_control, cpa_mask); + if (ret < 0) { + dev_err(sdw->cdns.dev, "Failed to power up link: %d\n", ret); + goto out; + } - if (!*shim_mask) { /* SyncCPU will change once link is active */ ret = intel_wait_bit(shim, SDW_SHIM_SYNC, SDW_SHIM_SYNC_SYNCCPU, 0); @@ -483,7 +490,7 @@ static void intel_shim_wake(struct sdw_intel *sdw, bool wake_enable) static int intel_link_power_down(struct sdw_intel *sdw) { - int link_control, spa_mask, cpa_mask; + u32 link_control, spa_mask, cpa_mask; unsigned int link_id = sdw->instance; void __iomem *shim = sdw->link_res->shim; u32 *shim_mask = sdw->link_res->shim_mask; @@ -493,24 +500,39 @@ static int intel_link_power_down(struct sdw_intel *sdw) intel_shim_master_ip_to_glue(sdw); - /* Link power down sequence */ - link_control = intel_readl(shim, SDW_SHIM_LCTL); - spa_mask = ~(SDW_SHIM_LCTL_SPA << link_id); - cpa_mask = (SDW_SHIM_LCTL_CPA << link_id); - link_control &= spa_mask; - - ret = intel_clear_bit(shim, SDW_SHIM_LCTL, link_control, cpa_mask); - if (!(*shim_mask & BIT(link_id))) dev_err(sdw->cdns.dev, "%s: Unbalanced power-up/down calls\n", __func__); *shim_mask &= ~BIT(link_id); + if (!*shim_mask) { + + dev_dbg(sdw->cdns.dev, "%s: powering down all links\n", __func__); + + /* Link power down sequence */ + link_control = intel_readl(shim, SDW_SHIM_LCTL); + + /* only power-down enabled links */ + spa_mask = (~sdw->link_res->link_mask) << + SDW_REG_SHIFT(SDW_SHIM_LCTL_SPA_MASK); + cpa_mask = sdw->link_res->link_mask << + SDW_REG_SHIFT(SDW_SHIM_LCTL_CPA_MASK); + + link_control &= spa_mask; + + ret = intel_clear_bit(shim, SDW_SHIM_LCTL, link_control, cpa_mask); + } + + link_control = intel_readl(shim, SDW_SHIM_LCTL); + mutex_unlock(sdw->link_res->shim_lock); - if (ret < 0) + if (ret < 0) { + dev_err(sdw->cdns.dev, "%s: could not power down link\n", __func__); + return ret; + } sdw->cdns.link_up = false; return 0;