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=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 A869BC2BCC4 for ; Mon, 10 May 2021 12:02:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7B917613DF for ; Mon, 10 May 2021 12:02:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244790AbhEJMCK (ORCPT ); Mon, 10 May 2021 08:02:10 -0400 Received: from mail.kernel.org ([198.145.29.99]:46846 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236158AbhEJLHk (ORCPT ); Mon, 10 May 2021 07:07:40 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 4C4DD6191D; Mon, 10 May 2021 10:58:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1620644315; bh=dVDuS0/JAk3BBVKWAnP1KZ9W/o1EEu+0rnNq1zwcQUs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WM6nfXpuNpMUowVdF2/6cWib9C4zcmu3WIoRFrowQvOhSWHqXFPxiWMb82CgoAHy5 1+r4DE57JMt7n33IRdNakorZbqIiShFM5LO0BlG9uE9CAfJibDo1cU8550YH78WIkI AkNoOUPqfErlRZ/uiUzPX1u6CzPU/zEhq0BtKRck= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Christophe Kerello , Mark Brown Subject: [PATCH 5.12 031/384] spi: stm32-qspi: fix pm_runtime usage_count counter Date: Mon, 10 May 2021 12:17:00 +0200 Message-Id: <20210510102015.897829538@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210510102014.849075526@linuxfoundation.org> References: <20210510102014.849075526@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Christophe Kerello commit 102e9d1936569d43f55dd1ea89be355ad207143c upstream. pm_runtime usage_count counter is not well managed. pm_runtime_put_autosuspend callback drops the usage_counter but this one has never been increased. Add pm_runtime_get_sync callback to bump up the usage counter. It is also needed to use pm_runtime_force_suspend and pm_runtime_force_resume APIs to handle properly the clock. Fixes: 9d282c17b023 ("spi: stm32-qspi: Add pm_runtime support") Signed-off-by: Christophe Kerello Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20210419121541.11617-2-patrice.chotard@foss.st.com Signed-off-by: Mark Brown Signed-off-by: Greg Kroah-Hartman --- drivers/spi/spi-stm32-qspi.c | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-) --- a/drivers/spi/spi-stm32-qspi.c +++ b/drivers/spi/spi-stm32-qspi.c @@ -727,21 +727,31 @@ static int __maybe_unused stm32_qspi_sus { pinctrl_pm_select_sleep_state(dev); - return 0; + return pm_runtime_force_suspend(dev); } static int __maybe_unused stm32_qspi_resume(struct device *dev) { struct stm32_qspi *qspi = dev_get_drvdata(dev); + int ret; + + ret = pm_runtime_force_resume(dev); + if (ret < 0) + return ret; pinctrl_pm_select_default_state(dev); - clk_prepare_enable(qspi->clk); + + ret = pm_runtime_get_sync(dev); + if (ret < 0) { + pm_runtime_put_noidle(dev); + return ret; + } writel_relaxed(qspi->cr_reg, qspi->io_base + QSPI_CR); writel_relaxed(qspi->dcr_reg, qspi->io_base + QSPI_DCR); - pm_runtime_mark_last_busy(qspi->dev); - pm_runtime_put_autosuspend(qspi->dev); + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); return 0; }