From patchwork Mon Jun 22 09:31:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maulik Shah X-Patchwork-Id: 11617333 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 80E0490 for ; Mon, 22 Jun 2020 09:33:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6822520738 for ; Mon, 22 Jun 2020 09:33:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="NWsp0wTF" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726973AbgFVJc6 (ORCPT ); Mon, 22 Jun 2020 05:32:58 -0400 Received: from m43-7.mailgun.net ([69.72.43.7]:28517 "EHLO m43-7.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726428AbgFVJc5 (ORCPT ); Mon, 22 Jun 2020 05:32:57 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1592818377; h=Message-Id: Date: Subject: Cc: To: From: Sender; bh=twvgkS9AkIqS69gxNCwbc02nHjwY7DpJVme1N0POgTk=; b=NWsp0wTFA3XH9sVzpuSrPqpAQSumU058vJkgkTsZGaDgnW8P52YrK9odnCKsPqwyyOI/HmqZ eRtvx1hZ7hnM3wYGLiISkcRZ+Zmm8gfPRJOYzgZ5wNHAHa93SPWKRq+9NT/j6tMw8oPMbdoO WE4IwuCxIc6k4fL+DBesDoifvDI= X-Mailgun-Sending-Ip: 69.72.43.7 X-Mailgun-Sid: WyI1MzIzYiIsICJsaW51eC1hcm0tbXNtQHZnZXIua2VybmVsLm9yZyIsICJiZTllNGEiXQ== Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n04.prod.us-west-2.postgun.com with SMTP id 5ef07ab5f3deea03f3a8f6ad (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Mon, 22 Jun 2020 09:32:37 GMT Received: by smtp.codeaurora.org (Postfix, from userid 1001) id C6C8AC433CB; Mon, 22 Jun 2020 09:32:36 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-caf-mail-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=2.0 tests=ALL_TRUSTED,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mkshah-linux.qualcomm.com (blr-c-bdr-fw-01_GlobalNAT_AllZones-Outside.qualcomm.com [103.229.19.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: mkshah) by smtp.codeaurora.org (Postfix) with ESMTPSA id 1003CC433C6; Mon, 22 Jun 2020 09:32:30 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 1003CC433C6 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=none smtp.mailfrom=mkshah@codeaurora.org From: Maulik Shah To: bjorn.andersson@linaro.org, maz@kernel.org, linus.walleij@linaro.org, swboyd@chromium.org, evgreen@chromium.org, mka@chromium.org Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-gpio@vger.kernel.org, agross@kernel.org, tglx@linutronix.de, jason@lakedaemon.net, dianders@chromium.org, rnayak@codeaurora.org, ilina@codeaurora.org, lsrao@codeaurora.org, Maulik Shah Subject: [PATCH v3 0/5] irqchip: qcom: pdc: Introduce irq_set_wake call Date: Mon, 22 Jun 2020 15:01:43 +0530 Message-Id: <1592818308-23001-1-git-send-email-mkshah@codeaurora.org> X-Mailer: git-send-email 2.7.4 Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Changes in v3: - Drop gpiolib change (v2 patch 1) since its already in linux-next - Add Acked-by Linus Walleij for v2 patch 2 and v2 patch 3. - Address Stephen's comment to on v2 patch 3 - Address Stephen's comment to change variable to static on v2 patch 4. - Add a new change to use return value from .irq_set_wake callback - Add a new change to reset PDC irq enable bank during init time Changes in v2: - Fix compiler error on gpiolib patch This series adds support to lazy disable pdc interrupt. Some drivers using gpio interrupts want to configure gpio for wakeup using enable_irq_wake() but during suspend entry disables irq and expects system to resume when interrupt occurs. In the driver resume call interrupt is re-enabled and removes wakeup capability using disable_irq_wake() one such example is cros ec driver. With [1] in documentation saying "An irq can be disabled with disable_irq() and still wake the system as long as the irq has wake enabled". The PDC IRQs are currently "unlazy disabled" (disable here means that it will be masked in PDC & GIC HW GICD_ISENABLER, the moment driver invokes disable_irq()) such IRQs can not wakeup from low power modes like suspend to RAM since the driver chosen to disable this. During suspend entry, no one re-enable/unmask in HW, even if its marked for wakeup. One solutions thought to address this problem was...During suspend entry at last point, irq chip driver re-enable/unmask IRQs in HW that are marked for wakeup. This was attemped in [2]. This series adds alternate solution to [2] by "lazy disable" IRQs in HW. The genirq takes care of lazy disable in case if irqchip did not implement irq_disable callback. Below is high level steps on how this works out.. a. During driver's disable_irq() call, IRQ will be marked disabled in SW b. IRQ will still be enabled(read unmasked in HW) c. The device then enters low power mode like suspend to RAM d. The HW detects unmasked IRQs and wakesup the CPU e. During resume after local_irq_enable() CPU goes to handle the wake IRQ f. Generic handler comes to know that IRQ is disabled in SW g. Generic handler marks IRQ as pending and now invokes mask callback h. IRQ gets disabled/masked in HW now i. When driver invokes enable_irq() the SW pending IRQ leads IRQ's handler j. enable_irq() will again enable/unmask in HW [1] https://www.spinics.net/lists/kernel/msg3398294.html [2] https://patchwork.kernel.org/patch/11466021/ Maulik Shah (5): pinctrl: qcom: Remove irq_disable callback from msmgpio irqchip pinctrl: qcom: Add msmgpio irqchip flags pinctrl: qcom: Use return value from irq_set_wake call irqchip: qcom-pdc: Introduce irq_set_wake call irqchip: qcom-pdc: Reset all pdc interrupts during init drivers/irqchip/qcom-pdc.c | 47 +++++++++++++++++++++++--------------- drivers/pinctrl/qcom/pinctrl-msm.c | 23 ++++--------------- 2 files changed, 34 insertions(+), 36 deletions(-)