From patchwork Fri Dec 7 19:08:29 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Lindgren X-Patchwork-Id: 10718757 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AEAE0109C for ; Fri, 7 Dec 2018 19:08:43 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9C11B2DA3F for ; Fri, 7 Dec 2018 19:08:43 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8FCA62DA27; Fri, 7 Dec 2018 19:08:43 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 068BE2DA11 for ; Fri, 7 Dec 2018 19:08:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726422AbeLGTIj (ORCPT ); Fri, 7 Dec 2018 14:08:39 -0500 Received: from muru.com ([72.249.23.125]:56810 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726415AbeLGTIj (ORCPT ); Fri, 7 Dec 2018 14:08:39 -0500 Received: from hillo.muru.com (localhost [127.0.0.1]) by muru.com (Postfix) with ESMTP id 67DEB80C0; Fri, 7 Dec 2018 19:08:40 +0000 (UTC) From: Tony Lindgren To: Linus Walleij , Alexandre Courbot Cc: linux-gpio@vger.kernel.org, linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Aaro Koskinen , Grygorii Strashko , Keerthy , Ladislav Michl , Russell King , Tero Kristo Subject: [PATCH] gpio: gpio-omap: Revert deferred wakeup quirk handling for regressions Date: Fri, 7 Dec 2018 11:08:29 -0800 Message-Id: <20181207190829.57864-1-tony@atomide.com> X-Mailer: git-send-email 2.19.2 MIME-Version: 1.0 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Commit ec0daae685b2 ("gpio: omap: Add level wakeup handling for omap4 based SoCs") attempted to fix omap4 GPIO wakeup handling as it was blocking deeper SoC idle states. However this caused a regression for GPIOs during runtime having over second long latencies for Ethernet GPIO interrupt as reportedy by Russell King . Let's fix this issue by doing a partial revert of the breaking commit. We still want to keep the quirk handling around as it is also used for OMAP_GPIO_QUIRK_IDLE_REMOVE_TRIGGER. The real fix for omap4 GPIO wakeup handling involves fixes for omap_set_gpio_trigger() and omap_gpio_unmask_irq() and will be posted separately. And we must keep the wakeup bit enabled during runtime because of module doing clock autogating with autoidle configured. Reported-by: Russell King Fixes: ec0daae685b2 ("gpio: omap: Add level wakeup handling for omap4 based SoCs") Cc: Aaro Koskinen Cc: Grygorii Strashko Cc: Keerthy Cc: Ladislav Michl Cc: Russell King Cc: Tero Kristo Signed-off-by: Tony Lindgren --- drivers/gpio/gpio-omap.c | 64 ++++------------------------------------ 1 file changed, 5 insertions(+), 59 deletions(-) diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c --- a/drivers/gpio/gpio-omap.c +++ b/drivers/gpio/gpio-omap.c @@ -32,7 +32,6 @@ #define OMAP4_GPIO_DEBOUNCINGTIME_MASK 0xFF #define OMAP_GPIO_QUIRK_IDLE_REMOVE_TRIGGER BIT(2) -#define OMAP_GPIO_QUIRK_DEFERRED_WKUP_EN BIT(1) struct gpio_regs { u32 irqenable1; @@ -379,18 +378,9 @@ static inline void omap_set_gpio_trigger(struct gpio_bank *bank, int gpio, readl_relaxed(bank->base + bank->regs->fallingdetect); if (likely(!(bank->non_wakeup_gpios & gpio_bit))) { - /* Defer wkup_en register update until we idle? */ - if (bank->quirks & OMAP_GPIO_QUIRK_DEFERRED_WKUP_EN) { - if (trigger) - bank->context.wake_en |= gpio_bit; - else - bank->context.wake_en &= ~gpio_bit; - } else { - omap_gpio_rmw(base, bank->regs->wkup_en, gpio_bit, - trigger != 0); - bank->context.wake_en = - readl_relaxed(bank->base + bank->regs->wkup_en); - } + omap_gpio_rmw(base, bank->regs->wkup_en, gpio_bit, trigger != 0); + bank->context.wake_en = + readl_relaxed(bank->base + bank->regs->wkup_en); } /* This part needs to be executed always for OMAP{34xx, 44xx} */ @@ -942,44 +932,6 @@ omap2_gpio_disable_level_quirk(struct gpio_bank *bank) bank->base + bank->regs->risingdetect); } -/* - * On omap4 and later SoC variants a level interrupt with wkup_en - * enabled blocks the GPIO functional clock from idling until the GPIO - * instance has been reset. To avoid that, we must set wkup_en only for - * idle for level interrupts, and clear level registers for the duration - * of idle. The level interrupts will be still there on wakeup by their - * nature. - */ -static void __maybe_unused -omap4_gpio_enable_level_quirk(struct gpio_bank *bank) -{ - /* Update wake register for idle, edge bits might be already set */ - writel_relaxed(bank->context.wake_en, - bank->base + bank->regs->wkup_en); - - /* Clear level registers for idle */ - writel_relaxed(0, bank->base + bank->regs->leveldetect0); - writel_relaxed(0, bank->base + bank->regs->leveldetect1); -} - -static void __maybe_unused -omap4_gpio_disable_level_quirk(struct gpio_bank *bank) -{ - /* Restore level registers after idle */ - writel_relaxed(bank->context.leveldetect0, - bank->base + bank->regs->leveldetect0); - writel_relaxed(bank->context.leveldetect1, - bank->base + bank->regs->leveldetect1); - - /* Clear saved wkup_en for level, it will be set for next idle again */ - bank->context.wake_en &= ~(bank->context.leveldetect0 | - bank->context.leveldetect1); - - /* Update wake with only edge configuration */ - writel_relaxed(bank->context.wake_en, - bank->base + bank->regs->wkup_en); -} - /*---------------------------------------------------------------------*/ static int omap_mpuio_suspend_noirq(struct device *dev) @@ -1412,12 +1364,7 @@ static int omap_gpio_probe(struct platform_device *pdev) omap_set_gpio_dataout_mask_multiple; } - if (bank->quirks & OMAP_GPIO_QUIRK_DEFERRED_WKUP_EN) { - bank->funcs.idle_enable_level_quirk = - omap4_gpio_enable_level_quirk; - bank->funcs.idle_disable_level_quirk = - omap4_gpio_disable_level_quirk; - } else if (bank->quirks & OMAP_GPIO_QUIRK_IDLE_REMOVE_TRIGGER) { + if (bank->quirks & OMAP_GPIO_QUIRK_IDLE_REMOVE_TRIGGER) { bank->funcs.idle_enable_level_quirk = omap2_gpio_enable_level_quirk; bank->funcs.idle_disable_level_quirk = @@ -1806,8 +1753,7 @@ static const struct omap_gpio_platform_data omap4_pdata = { .regs = &omap4_gpio_regs, .bank_width = 32, .dbck_flag = true, - .quirks = OMAP_GPIO_QUIRK_IDLE_REMOVE_TRIGGER | - OMAP_GPIO_QUIRK_DEFERRED_WKUP_EN, + .quirks = OMAP_GPIO_QUIRK_IDLE_REMOVE_TRIGGER, }; static const struct of_device_id omap_gpio_match[] = {