From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751303AbdH1Mds (ORCPT ); Mon, 28 Aug 2017 08:33:48 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:57708 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750866AbdH1Mdp (ORCPT ); Mon, 28 Aug 2017 08:33:45 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org EBA0160241 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=vviswana@codeaurora.org Subject: Re: [PATCH 1/5] mmc: sdhci-msm: fix issue with power irq To: Adrian Hunter , ulf.hansson@linaro.org, will.deacon@arm.com Cc: linux-arm-kernel@lists.infradead.org, linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, asutoshd@codeaurora.org, stummala@codeaurora.org, riteshh@codeaurora.org, subhashj@codeaurora.org References: <1503033582-48703-1-git-send-email-vviswana@codeaurora.org> <1503033582-48703-2-git-send-email-vviswana@codeaurora.org> <7b85cd75-4f39-df08-eaa1-cd7f9499c29b@intel.com> From: Vijay Viswanath Message-ID: Date: Mon, 28 Aug 2017 18:03:38 +0530 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0 MIME-Version: 1.0 In-Reply-To: <7b85cd75-4f39-df08-eaa1-cd7f9499c29b@intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 8/24/2017 1:10 PM, Adrian Hunter wrote: > On 18/08/17 08:19, Vijay Viswanath wrote: >> From: Subhash Jadavani >> >> SDCC controller reset (SW_RST) during probe may trigger power irq if >> previous status of PWRCTL was either BUS_ON or IO_HIGH_V. So before we >> enable the power irq interrupt in GIC (by registering the interrupt >> handler), we need to ensure that any pending power irq interrupt status >> is acknowledged otherwise power irq interrupt handler would be fired >> prematurely. >> >> Signed-off-by: Subhash Jadavani >> Signed-off-by: Vijay Viswanath >> --- >> drivers/mmc/host/sdhci-msm.c | 26 ++++++++++++++++++++++++++ >> 1 file changed, 26 insertions(+) >> >> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c >> index 9d601dc..0957199 100644 >> --- a/drivers/mmc/host/sdhci-msm.c >> +++ b/drivers/mmc/host/sdhci-msm.c >> @@ -1128,6 +1128,7 @@ static int sdhci_msm_probe(struct platform_device *pdev) >> u16 host_version, core_minor; >> u32 core_version, config; >> u8 core_major; >> + u32 irq_status, irq_ctl; >> >> host = sdhci_pltfm_init(pdev, &sdhci_msm_pdata, sizeof(*msm_host)); >> if (IS_ERR(host)) >> @@ -1250,6 +1251,28 @@ static int sdhci_msm_probe(struct platform_device *pdev) >> CORE_VENDOR_SPEC_CAPABILITIES0); >> } >> >> + /* >> + * Power on reset state may trigger power irq if previous status of >> + * PWRCTL was either BUS_ON or IO_HIGH_V. So before enabling pwr irq >> + * interrupt in GIC, any pending power irq interrupt should be >> + * acknowledged. Otherwise power irq interrupt handler would be >> + * fired prematurely. >> + */ >> + >> + irq_status = readl_relaxed(msm_host->core_mem + CORE_PWRCTL_STATUS); >> + writel_relaxed(irq_status, msm_host->core_mem + CORE_PWRCTL_CLEAR); >> + irq_ctl = readl_relaxed(msm_host->core_mem + CORE_PWRCTL_CTL); >> + if (irq_status & (CORE_PWRCTL_BUS_ON | CORE_PWRCTL_BUS_OFF)) >> + irq_ctl |= CORE_PWRCTL_BUS_SUCCESS; >> + if (irq_status & (CORE_PWRCTL_IO_HIGH | CORE_PWRCTL_IO_LOW)) >> + irq_ctl |= CORE_PWRCTL_IO_SUCCESS; >> + writel_relaxed(irq_ctl, msm_host->core_mem + CORE_PWRCTL_CTL); > > This looks a lot like sdhci_msm_voltage_switch(). Can clearing the > interrupt be a common function? > This is better. Will change the patches to do it this way. >> + /* >> + * Ensure that above writes are propogated before interrupt enablement >> + * in GIC. >> + */ >> + mb(); >> + >> /* Setup IRQ for handling power/voltage tasks with PMIC */ >> msm_host->pwr_irq = platform_get_irq_byname(pdev, "pwr_irq"); >> if (msm_host->pwr_irq < 0) { >> @@ -1259,6 +1282,9 @@ static int sdhci_msm_probe(struct platform_device *pdev) >> goto clk_disable; >> } >> >> + /* Enable pwr irq interrupts */ >> + writel_relaxed(INT_MASK, msm_host->core_mem + CORE_PWRCTL_MASK); >> + >> ret = devm_request_threaded_irq(&pdev->dev, msm_host->pwr_irq, NULL, >> sdhci_msm_pwr_irq, IRQF_ONESHOT, >> dev_name(&pdev->dev), host); >> >