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 X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 4713CC32793 for ; Sun, 29 Sep 2019 17:42:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1922F2086A for ; Sun, 29 Sep 2019 17:42:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569778952; bh=hDhef2aTdq4qR/BBdAQqoM/CUsEQJstjxEaKYJBV94I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=hwfpvdq+CsY3/As0JG80raaXbDEJV+IvuOVpNREc6xHVAq3AK3IdE6q3IWkZ67KHV 073sAzHQOJ/nyC9MaggQxRvkxfdR6GQUd+QOMxG4rWRNvDb8Lni+V2cvrqFLmB8zZ2 8UEhhWIj+4Uwc2T3EUCzTvRiLIAtFaz2I/KzYy1o= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729646AbfI2RcH (ORCPT ); Sun, 29 Sep 2019 13:32:07 -0400 Received: from mail.kernel.org ([198.145.29.99]:42782 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729605AbfI2RcF (ORCPT ); Sun, 29 Sep 2019 13:32:05 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 7B36221906; Sun, 29 Sep 2019 17:32:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569778323; bh=hDhef2aTdq4qR/BBdAQqoM/CUsEQJstjxEaKYJBV94I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GlZaC3/F4VqLK7g32dCqxE36bUzCIINQFHN9jA/gmrk43+0A/jc+c7+EyNOKnXXx/ kdXGonuQwDTtQDgUD2JiSswfQIAdwvALyin4hfHPr+ZyR9vfAH3snvd9Yhk1IdX3xc /fDpUr4EJ0L/9YV1FnP/5I5JgnmmAE4v2gEteQyY= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Jon Hunter , Thierry Reding , Wolfram Sang , Sasha Levin , linux-i2c@vger.kernel.org, linux-tegra@vger.kernel.org Subject: [PATCH AUTOSEL 5.3 35/49] i2c: tegra: Move suspend handling to NOIRQ phase Date: Sun, 29 Sep 2019 13:30:35 -0400 Message-Id: <20190929173053.8400-35-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190929173053.8400-1-sashal@kernel.org> References: <20190929173053.8400-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jon Hunter [ Upstream commit 8ebf15e9c869e764b3aab4928938ee68c0e2bd6d ] Commit acc8abcb2a9c ("i2c: tegra: Add suspend-resume support") added suspend support for the Tegra I2C driver and following this change on Tegra30 the following WARNING is seen on entering suspend ... WARNING: CPU: 2 PID: 689 at /dvs/git/dirty/git-master_l4t-upstream/kernel/drivers/i2c/i2c-core.h:54 __i2c_transfer+0x35c/0x70c i2c i2c-4: Transfer while suspended Modules linked in: brcmfmac brcmutil CPU: 2 PID: 689 Comm: rtcwake Not tainted 5.3.0-rc7-g089cf7f6ecb2 #1 Hardware name: NVIDIA Tegra SoC (Flattened Device Tree) [] (unwind_backtrace) from [] (show_stack+0x10/0x14) [] (show_stack) from [] (dump_stack+0xb4/0xc8) [] (dump_stack) from [] (__warn+0xe0/0xf8) [] (__warn) from [] (warn_slowpath_fmt+0x48/0x6c) [] (warn_slowpath_fmt) from [] (__i2c_transfer+0x35c/0x70c) [] (__i2c_transfer) from [] (i2c_transfer+0x58/0xf4) [] (i2c_transfer) from [] (i2c_transfer_buffer_flags+0x4c/0x70) [] (i2c_transfer_buffer_flags) from [] (regmap_i2c_write+0x14/0x30) [] (regmap_i2c_write) from [] (_regmap_raw_write_impl+0x35c/0x868) [] (_regmap_raw_write_impl) from [] (_regmap_update_bits+0xe4/0xec) [] (_regmap_update_bits) from [] (regmap_update_bits_base+0x50/0x74) [] (regmap_update_bits_base) from [] (regulator_disable_regmap+0x44/0x54) [] (regulator_disable_regmap) from [] (_regulator_do_disable+0xf8/0x268) [] (_regulator_do_disable) from [] (_regulator_disable+0xf4/0x19c) [] (_regulator_disable) from [] (regulator_disable+0x34/0x64) [] (regulator_disable) from [] (regulator_bulk_disable+0x28/0xb4) [] (regulator_bulk_disable) from [] (tegra_pcie_power_off+0x64/0xa8) [] (tegra_pcie_power_off) from [] (tegra_pcie_pm_suspend+0x25c/0x3f4) [] (tegra_pcie_pm_suspend) from [] (dpm_run_callback+0x38/0x1d4) [] (dpm_run_callback) from [] (__device_suspend_noirq+0xc0/0x2b8) [] (__device_suspend_noirq) from [] (dpm_noirq_suspend_devices+0x100/0x37c) [] (dpm_noirq_suspend_devices) from [] (dpm_suspend_noirq+0x1c/0x48) [] (dpm_suspend_noirq) from [] (suspend_devices_and_enter+0x1d0/0xa00) [] (suspend_devices_and_enter) from [] (pm_suspend+0x220/0x74c) [] (pm_suspend) from [] (state_store+0x6c/0xc8) [] (state_store) from [] (kernfs_fop_write+0xe8/0x1c4) [] (kernfs_fop_write) from [] (__vfs_write+0x2c/0x1c4) [] (__vfs_write) from [] (vfs_write+0xa4/0x184) [] (vfs_write) from [] (ksys_write+0x9c/0xdc) [] (ksys_write) from [] (ret_fast_syscall+0x0/0x54) Exception stack(0xe9f21fa8 to 0xe9f21ff0) 1fa0: 0000006c 004b2438 00000004 004b2438 00000004 00000000 1fc0: 0000006c 004b2438 004b1228 00000004 00000004 00000004 0049e78c 004b1228 1fe0: 00000004 be9809b8 b6f0bc0b b6e96206 The problem is that the Tegra PCIe driver indirectly uses I2C for controlling some regulators and the I2C driver is now being suspended before the PCIe driver causing the PCIe suspend to fail. The Tegra PCIe driver is suspended during the NOIRQ phase and this cannot be changed due to other dependencies. Therefore, we also need to move the suspend handling for the Tegra I2C driver to the NOIRQ phase as well. In order to move the I2C suspend handling to the NOIRQ phase we also need to avoid calling pm_runtime_get/put() because per commit 1e2ef05bb8cf ("PM: Limit race conditions between runtime PM and system sleep (v2)") these cannot be called early in resume. The function tegra_i2c_init(), called during resume, calls pm_runtime_get/put() and so move these calls outside of tegra_i2c_init(), so this function can be used during the NOIRQ resume phase. Fixes: acc8abcb2a9c ("i2c: tegra: Add suspend-resume support") Signed-off-by: Jon Hunter Acked-by: Thierry Reding Signed-off-by: Wolfram Sang Signed-off-by: Sasha Levin --- drivers/i2c/busses/i2c-tegra.c | 40 +++++++++++++++++++--------------- 1 file changed, 22 insertions(+), 18 deletions(-) diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c index 9fcb13beeb8f4..7a3291d91a5ee 100644 --- a/drivers/i2c/busses/i2c-tegra.c +++ b/drivers/i2c/busses/i2c-tegra.c @@ -713,12 +713,6 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev, bool clk_reinit) u32 tsu_thd; u8 tlow, thigh; - err = pm_runtime_get_sync(i2c_dev->dev); - if (err < 0) { - dev_err(i2c_dev->dev, "runtime resume failed %d\n", err); - return err; - } - reset_control_assert(i2c_dev->rst); udelay(2); reset_control_deassert(i2c_dev->rst); @@ -772,7 +766,7 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev, bool clk_reinit) if (err) { dev_err(i2c_dev->dev, "failed changing clock rate: %d\n", err); - goto err; + return err; } } @@ -787,23 +781,21 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev, bool clk_reinit) err = tegra_i2c_flush_fifos(i2c_dev); if (err) - goto err; + return err; if (i2c_dev->is_multimaster_mode && i2c_dev->hw->has_slcg_override_reg) i2c_writel(i2c_dev, I2C_MST_CORE_CLKEN_OVR, I2C_CLKEN_OVERRIDE); err = tegra_i2c_wait_for_config_load(i2c_dev); if (err) - goto err; + return err; if (i2c_dev->irq_disabled) { i2c_dev->irq_disabled = false; enable_irq(i2c_dev->irq); } -err: - pm_runtime_put(i2c_dev->dev); - return err; + return 0; } static int tegra_i2c_disable_packet_mode(struct tegra_i2c_dev *i2c_dev) @@ -1616,12 +1608,14 @@ static int tegra_i2c_probe(struct platform_device *pdev) } pm_runtime_enable(&pdev->dev); - if (!pm_runtime_enabled(&pdev->dev)) { + if (!pm_runtime_enabled(&pdev->dev)) ret = tegra_i2c_runtime_resume(&pdev->dev); - if (ret < 0) { - dev_err(&pdev->dev, "runtime resume failed\n"); - goto unprepare_div_clk; - } + else + ret = pm_runtime_get_sync(i2c_dev->dev); + + if (ret < 0) { + dev_err(&pdev->dev, "runtime resume failed\n"); + goto unprepare_div_clk; } if (i2c_dev->is_multimaster_mode) { @@ -1666,6 +1660,8 @@ static int tegra_i2c_probe(struct platform_device *pdev) if (ret) goto release_dma; + pm_runtime_put(&pdev->dev); + return 0; release_dma: @@ -1726,17 +1722,25 @@ static int tegra_i2c_resume(struct device *dev) struct tegra_i2c_dev *i2c_dev = dev_get_drvdata(dev); int err; + err = tegra_i2c_runtime_resume(dev); + if (err) + return err; + err = tegra_i2c_init(i2c_dev, false); if (err) return err; + err = tegra_i2c_runtime_suspend(dev); + if (err) + return err; + i2c_mark_adapter_resumed(&i2c_dev->adapter); return 0; } static const struct dev_pm_ops tegra_i2c_pm = { - SET_SYSTEM_SLEEP_PM_OPS(tegra_i2c_suspend, tegra_i2c_resume) + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(tegra_i2c_suspend, tegra_i2c_resume) SET_RUNTIME_PM_OPS(tegra_i2c_runtime_suspend, tegra_i2c_runtime_resume, NULL) }; -- 2.20.1