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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 03F3BC4167B for ; Tue, 5 Dec 2023 08:20:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=INw/trnqO68woue+AxVJwAky8+K+XXnT1BBpNK2BZTQ=; b=h0gSyUJfP8gEX8 SgyCUJcPNMb3CJ6E4wIAJGUqvYK0tE27KVNeJHmn61N+8UVmIued1ZT8GKZBtyWlCCEXvJMKfB1EG YSmeGxwTwZcqJjUBQ0m7l9xrPVRVXSUC3kKie3eVlwinAIHAWvJWd3Z39sVVBJymLtOFwRCjoXRdJ 7W6VBH7K6HcgrP3Asl+YkyWyKYqOWrrZG5S1/oLMbidO0d0E1vyJ/Qf4NARG0AM6tfUuJ67exVVKE /Cq6hL8BtStYTLNe32dT0ZoCYslUpbNe8aLdZ5kR1a6rPeRrUchPCyAr9VVzZ44gReR5kUV34hb5H 2Ya1xxJ/KQ24n/a/ZmSg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1rAQf9-006dAq-0t; Tue, 05 Dec 2023 08:20:15 +0000 Received: from perceval.ideasonboard.com ([213.167.242.64]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1rAQf5-006d9A-2t; Tue, 05 Dec 2023 08:20:13 +0000 Received: from pendragon.ideasonboard.com (213-243-189-158.bb.dnainternet.fi [213.243.189.158]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 0071D4DB; Tue, 5 Dec 2023 09:19:28 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1701764369; bh=as9eWJPgC11SsS4l6Lvvaa+kNs5Pv8jA5yRszHq/yuw=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=NG5AsM1WDj/dpFyJXpfYG2U5Wk/Q8d2hWl9HP/Fi8TetGLkByR35i57owTTYVsXyF /Cjng5whpC2Ol5A6X4s58FNdlkLFMBUrWBwElrEja5csvQigusRNURPuNXtYd0zVV4 +2EHuUz31Bv8ROLQhwOtdRTqg3lF3O4FVjhJgoDs= Date: Tue, 5 Dec 2023 10:20:16 +0200 From: Laurent Pinchart To: Tomi Valkeinen Cc: Dafna Hirschfeld , Mauro Carvalho Chehab , Heiko Stuebner , Paul Elder , Alexander Stein , kieran.bingham@ideasonboard.com, umang.jain@ideasonboard.com, aford173@gmail.com, linux-media@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 3/4] media: rkisp1: Fix IRQ handling due to shared interrupts Message-ID: <20231205082016.GA17394@pendragon.ideasonboard.com> References: <20231205-rkisp-irq-fix-v1-0-f4045c74ba45@ideasonboard.com> <20231205-rkisp-irq-fix-v1-3-f4045c74ba45@ideasonboard.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20231205-rkisp-irq-fix-v1-3-f4045c74ba45@ideasonboard.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231205_002012_099151_FB0545AD X-CRM114-Status: GOOD ( 27.93 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Tomi, Thank you for the patch. On Tue, Dec 05, 2023 at 10:09:34AM +0200, Tomi Valkeinen wrote: > The driver requests the interrupts as IRQF_SHARED, so the interrupt > handlers can be called at any time. If such a call happens while the ISP > is powered down, the SoC will hang as the driver tries to access the > ISP registers. Is IRQF_SHARED actually needed ? > Fix this by adding a new field, 'irqs_enabled', which is used to bail > out from the interrupt handler when the ISP is not operational. > > Signed-off-by: Tomi Valkeinen > --- > .../media/platform/rockchip/rkisp1/rkisp1-capture.c | 3 +++ > .../media/platform/rockchip/rkisp1/rkisp1-common.h | 2 ++ > drivers/media/platform/rockchip/rkisp1/rkisp1-csi.c | 3 +++ > drivers/media/platform/rockchip/rkisp1/rkisp1-dev.c | 21 +++++++++++++++++++++ > drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c | 3 +++ > 5 files changed, 32 insertions(+) > > diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-capture.c b/drivers/media/platform/rockchip/rkisp1/rkisp1-capture.c > index b50b044d22af..e92067897f28 100644 > --- a/drivers/media/platform/rockchip/rkisp1/rkisp1-capture.c > +++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-capture.c > @@ -779,6 +779,9 @@ irqreturn_t rkisp1_capture_isr(int irq, void *ctx) > unsigned int i; > u32 status; > > + if (!rkisp1->irqs_enabled) > + return IRQ_NONE; > + > status = rkisp1_read(rkisp1, RKISP1_CIF_MI_MIS); > if (!status) > return IRQ_NONE; > diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-common.h b/drivers/media/platform/rockchip/rkisp1/rkisp1-common.h > index ec28907d978e..7f97fdf6e24c 100644 > --- a/drivers/media/platform/rockchip/rkisp1/rkisp1-common.h > +++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-common.h > @@ -465,6 +465,7 @@ struct rkisp1_debug { > * @debug: debug params to be exposed on debugfs > * @info: version-specific ISP information > * @irqs: IRQ line numbers > + * @irqs_enabled: the hardware is enabled and can cause interrupts > */ > struct rkisp1_device { > void __iomem *base_addr; > @@ -488,6 +489,7 @@ struct rkisp1_device { > struct rkisp1_debug debug; > const struct rkisp1_info *info; > int irqs[RKISP1_NUM_IRQS]; > + bool irqs_enabled; > }; > > /* > diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-csi.c b/drivers/media/platform/rockchip/rkisp1/rkisp1-csi.c > index 47f4353a1784..f6b54654b435 100644 > --- a/drivers/media/platform/rockchip/rkisp1/rkisp1-csi.c > +++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-csi.c > @@ -184,6 +184,9 @@ irqreturn_t rkisp1_csi_isr(int irq, void *ctx) > struct rkisp1_device *rkisp1 = dev_get_drvdata(dev); > u32 val, status; > > + if (!rkisp1->irqs_enabled) > + return IRQ_NONE; > + > status = rkisp1_read(rkisp1, RKISP1_CIF_MIPI_MIS); > if (!status) > return IRQ_NONE; > diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-dev.c b/drivers/media/platform/rockchip/rkisp1/rkisp1-dev.c > index 1d60f4b8bd09..fbe03f7864e3 100644 > --- a/drivers/media/platform/rockchip/rkisp1/rkisp1-dev.c > +++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-dev.c > @@ -306,6 +306,23 @@ static int __maybe_unused rkisp1_runtime_suspend(struct device *dev) > { > struct rkisp1_device *rkisp1 = dev_get_drvdata(dev); > > + rkisp1->irqs_enabled = false; > + /* Make sure the IRQ handler will see the above */ > + mb(); > + > + /* > + * Wait until any running IRQ handler has returned. The IRQ handler > + * may get called even after this (as it's a shared interrupt line) > + * but the 'irqs_enabled' flag will make the handler return immediately. > + */ > + for (unsigned int i = 0; i < RKISP1_NUM_IRQS; ++i) { > + if (rkisp1->irqs[i] == -1) > + continue; > + > + if (i == 0 || rkisp1->irqs[i - 1] != rkisp1->irqs[i]) > + synchronize_irq(rkisp1->irqs[i]); > + } > + > clk_bulk_disable_unprepare(rkisp1->clk_size, rkisp1->clks); > return pinctrl_pm_select_sleep_state(dev); > } > @@ -322,6 +339,10 @@ static int __maybe_unused rkisp1_runtime_resume(struct device *dev) > if (ret) > return ret; > > + rkisp1->irqs_enabled = true; > + /* Make sure the IRQ handler will see the above */ > + mb(); > + > return 0; > } > > diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c b/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c > index dafbfd230542..d6b8786661ad 100644 > --- a/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c > +++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c > @@ -1082,6 +1082,9 @@ irqreturn_t rkisp1_isp_isr(int irq, void *ctx) > struct rkisp1_device *rkisp1 = dev_get_drvdata(dev); > u32 status, isp_err; > > + if (!rkisp1->irqs_enabled) > + return IRQ_NONE; > + > status = rkisp1_read(rkisp1, RKISP1_CIF_ISP_MIS); > if (!status) > return IRQ_NONE; -- Regards, Laurent Pinchart _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel