From patchwork Wed Nov 6 12:52:12 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zoie Lin X-Patchwork-Id: 13864913 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 9DD92D44D58 for ; Wed, 6 Nov 2024 13:28:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type:MIME-Version: References:In-Reply-To:Message-ID:Date:Subject:CC:To:From:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=g0st/8R2qgIpfSgF7sej0N9L/I6NYiIrFWt3AZT0jGc=; b=H5xmEmBrs69UnoiudUuIzJ1st5 i6N+buwlgg2cUE04Zq/2zRwOihFaWcHkfK/+LDuEuDBWy9pOLyDNbc/IXhgCPvfdn/tuyoHMwRtOV WW9aURJpYN8Wjwm/tHxZR/Vry7jQx9cwPA9XC95yT5zbwMyfBgr0dtgn7qrJADFGtOyEfkyHq9r66 3Mw8qHYK77Pdt/+Zt3s3Qj388D/7M34FQNFmkAcVljMAv6v+ff+6y+q134YVQk6xcf7+m1SQ/xm1G tqMukqnIdujE7GtjT+zBQZhhKEZ3xwZQEH8q7rG4/ZQBybJInoCPX3MgkCfRkxzYyQOIPi/FDbgBZ D4lS0sFA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1t8g5J-00000003Pxm-0JYB; Wed, 06 Nov 2024 13:28:33 +0000 Received: from mailgw01.mediatek.com ([216.200.240.184]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1t8fYX-00000003KEc-3LlV; Wed, 06 Nov 2024 12:54:43 +0000 X-UUID: 491bdcf29c3e11ef82ff63e91e7eb18c-20241106 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From; bh=g0st/8R2qgIpfSgF7sej0N9L/I6NYiIrFWt3AZT0jGc=; b=VA548CbeVyGMAY6hLMXrvccvBWcla1R+L3IgueH4D/FcVvZHAiVW7cBFKE8qBywxLDEZ2GBHLGQKS5jC+1NmSBIVoQmSH4Q0Zc3IWO+oBhzBPQdnwzsoislKCkLJsltJsIjQWGu2AcICZuVDy3lAinws257SgAANOlARSieiOLM=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.42,REQID:2684c8c4-78eb-447a-9727-bf65cab9641e,IP:0,U RL:0,TC:0,Content:-25,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTIO N:release,TS:-25 X-CID-META: VersionHash:b0fcdc3,CLOUDID:6d4fb81b-4f51-4e1d-bb6a-1fd98b6b19d2,B ulkID:nil,BulkQuantity:0,Recheck:0,SF:102,TC:nil,Content:0,EDM:-3,IP:nil,U RL:0,File:nil,RT:nil,Bulk:nil,QS:nil,BEC:nil,COL:0,OSI:0,OSA:0,AV:0,LES:1, SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0,ARC:0 X-CID-BVR: 0 X-CID-BAS: 0,_,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR X-UUID: 491bdcf29c3e11ef82ff63e91e7eb18c-20241106 Received: from mtkmbs11n2.mediatek.inc [(172.21.101.187)] by mailgw01.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 222700788; Wed, 06 Nov 2024 05:54:40 -0700 Received: from mtkmbs13n2.mediatek.inc (172.21.101.108) by mtkmbs13n2.mediatek.inc (172.21.101.108) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Wed, 6 Nov 2024 20:54:37 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkmbs13n2.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1118.26 via Frontend Transport; Wed, 6 Nov 2024 20:54:37 +0800 From: Zoie Lin To: Qii Wang , Andi Shyti , Matthias Brugger , AngeloGioacchino Del Regno CC: , , , , , , Zoie Lin Subject: [v2,1/1] i2c: mediatek: add runtime PM operations and bus regulator control Date: Wed, 6 Nov 2024 20:52:12 +0800 Message-ID: <20241106125212.27362-2-zoie.lin@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20241106125212.27362-1-zoie.lin@mediatek.com> References: <20241106125212.27362-1-zoie.lin@mediatek.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241106_045441_864603_1898FFA3 X-CRM114-Status: GOOD ( 17.66 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This commit introduces support for runtime PM operations in the I2C driver, enabling runtime suspend and resume functionality. Although in the most platforms, the bus power of i2c are always on, some platforms disable the i2c bus power in order to meet low power request. This implementation includes bus regulator control to facilitate proper handling of the bus power based on platform requirements. Signed-off-by: Zoie Lin --- drivers/i2c/busses/i2c-mt65xx.c | 77 ++++++++++++++++++++++++++++----- 1 file changed, 65 insertions(+), 12 deletions(-) diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c index 5bd342047d59..4209daec1efa 100644 --- a/drivers/i2c/busses/i2c-mt65xx.c +++ b/drivers/i2c/busses/i2c-mt65xx.c @@ -21,6 +21,7 @@ #include #include #include +#include #include #include #include @@ -1245,8 +1246,8 @@ static int mtk_i2c_transfer(struct i2c_adapter *adap, int left_num = num; struct mtk_i2c *i2c = i2c_get_adapdata(adap); - ret = clk_bulk_enable(I2C_MT65XX_CLK_MAX, i2c->clocks); - if (ret) + ret = pm_runtime_resume_and_get(i2c->dev); + if (ret < 0) return ret; i2c->auto_restart = i2c->dev_comp->auto_restart; @@ -1299,7 +1300,9 @@ static int mtk_i2c_transfer(struct i2c_adapter *adap, ret = num; err_exit: - clk_bulk_disable(I2C_MT65XX_CLK_MAX, i2c->clocks); + pm_runtime_mark_last_busy(i2c->dev); + pm_runtime_put_autosuspend(i2c->dev); + return ret; } @@ -1370,6 +1373,40 @@ static int mtk_i2c_parse_dt(struct device_node *np, struct mtk_i2c *i2c) return 0; } +static int mtk_i2c_runtime_suspend(struct device *dev) +{ + struct mtk_i2c *i2c = dev_get_drvdata(dev); + + clk_bulk_disable(I2C_MT65XX_CLK_MAX, i2c->clocks); + if (i2c->adap.bus_regulator) + regulator_disable(i2c->adap.bus_regulator); + + return 0; +} + +static int mtk_i2c_runtime_resume(struct device *dev) +{ + int ret = 0; + struct mtk_i2c *i2c = dev_get_drvdata(dev); + + if (i2c->adap.bus_regulator) { + ret = regulator_enable(i2c->adap.bus_regulator); + if (ret) { + dev_err(dev, "enable regulator failed!\n"); + return ret; + } + } + + ret = clk_bulk_enable(I2C_MT65XX_CLK_MAX, i2c->clocks); + if (ret) { + if (i2c->adap.bus_regulator) + regulator_disable(i2c->adap.bus_regulator); + return ret; + } + + return 0; +} + static int mtk_i2c_probe(struct platform_device *pdev) { int ret = 0; @@ -1472,13 +1509,18 @@ static int mtk_i2c_probe(struct platform_device *pdev) } } - ret = clk_bulk_prepare_enable(I2C_MT65XX_CLK_MAX, i2c->clocks); + ret = clk_bulk_prepare(I2C_MT65XX_CLK_MAX, i2c->clocks); if (ret) { - dev_err(&pdev->dev, "clock enable failed!\n"); return ret; } + + platform_set_drvdata(pdev, i2c); + + ret = mtk_i2c_runtime_resume(i2c->dev); + if (ret < 0) + goto err_clk_bulk_unprepare; mtk_i2c_init_hw(i2c); - clk_bulk_disable(I2C_MT65XX_CLK_MAX, i2c->clocks); + mtk_i2c_runtime_suspend(i2c->dev); ret = devm_request_irq(&pdev->dev, irq, mtk_i2c_irq, IRQF_NO_SUSPEND | IRQF_TRIGGER_NONE, @@ -1486,19 +1528,22 @@ static int mtk_i2c_probe(struct platform_device *pdev) if (ret < 0) { dev_err(&pdev->dev, "Request I2C IRQ %d fail\n", irq); - goto err_bulk_unprepare; + goto err_clk_bulk_unprepare; } + pm_runtime_set_autosuspend_delay(&pdev->dev, 1000); + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_enable(&pdev->dev); i2c_set_adapdata(&i2c->adap, i2c); ret = i2c_add_adapter(&i2c->adap); if (ret) - goto err_bulk_unprepare; - - platform_set_drvdata(pdev, i2c); + goto err_pm_runtime_disable; return 0; -err_bulk_unprepare: +err_pm_runtime_disable: + pm_runtime_disable(&pdev->dev); +err_clk_bulk_unprepare: clk_bulk_unprepare(I2C_MT65XX_CLK_MAX, i2c->clocks); return ret; @@ -1510,6 +1555,7 @@ static void mtk_i2c_remove(struct platform_device *pdev) i2c_del_adapter(&i2c->adap); + pm_runtime_disable(&pdev->dev); clk_bulk_unprepare(I2C_MT65XX_CLK_MAX, i2c->clocks); } @@ -1518,6 +1564,10 @@ static int mtk_i2c_suspend_noirq(struct device *dev) struct mtk_i2c *i2c = dev_get_drvdata(dev); i2c_mark_adapter_suspended(&i2c->adap); + + if (!pm_runtime_status_suspended(dev)) + mtk_i2c_runtime_suspend(dev); + clk_bulk_unprepare(I2C_MT65XX_CLK_MAX, i2c->clocks); return 0; @@ -1536,7 +1586,8 @@ static int mtk_i2c_resume_noirq(struct device *dev) mtk_i2c_init_hw(i2c); - clk_bulk_disable(I2C_MT65XX_CLK_MAX, i2c->clocks); + if (pm_runtime_status_suspended(dev)) + mtk_i2c_runtime_suspend(dev); i2c_mark_adapter_resumed(&i2c->adap); @@ -1546,6 +1597,8 @@ static int mtk_i2c_resume_noirq(struct device *dev) static const struct dev_pm_ops mtk_i2c_pm = { NOIRQ_SYSTEM_SLEEP_PM_OPS(mtk_i2c_suspend_noirq, mtk_i2c_resume_noirq) + SET_RUNTIME_PM_OPS(mtk_i2c_runtime_suspend, mtk_i2c_runtime_resume, + NULL) }; static struct platform_driver mtk_i2c_driver = {