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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 13823C4332F for ; Mon, 22 Nov 2021 10:30:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236244AbhKVKdx (ORCPT ); Mon, 22 Nov 2021 05:33:53 -0500 Received: from mail.kernel.org ([198.145.29.99]:59794 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236184AbhKVKdx (ORCPT ); Mon, 22 Nov 2021 05:33:53 -0500 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C186660F6B; Mon, 22 Nov 2021 10:30:40 +0000 (UTC) Received: from sofa.misterjones.org ([185.219.108.64] helo=hot-poop.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1mp6as-0071pT-Gp; Mon, 22 Nov 2021 10:30:38 +0000 From: Marc Zyngier To: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Cc: kernel-team@android.com, Rob Herring , John Crispin , Biwen Li , Chris Brandt , Geert Uytterhoeven Subject: [PATCH] of/irq: Add a quirk for controllers with their own definition of interrupt-map Date: Mon, 22 Nov 2021 10:30:32 +0000 Message-Id: <20211122103032.517923-1-maz@kernel.org> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, kernel-team@android.com, robh@kernel.org, john@phrozen.org, biwen.li@nxp.com, chris.brandt@renesas.com, geert+renesas@glider.be X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Since 041284181226 ("of/irq: Allow matching of an interrupt-map local to an interrupt controller"), a handful of interrupt controllers have stopped working correctly. This is due to the DT exposing a non-sensical interrupt-map property, and their drivers relying on the kernel ignoring this property. Since we cannot realistically fix this terrible behaviour, add a quirk for the limited set of devices that have implemented this monster, and document that this is a pretty bad practice. Cc: Rob Herring Cc: John Crispin Cc: Biwen Li Cc: Chris Brandt Cc: Geert Uytterhoeven Signed-off-by: Marc Zyngier --- drivers/of/irq.c | 37 +++++++++++++++++++++++++++++++++++-- 1 file changed, 35 insertions(+), 2 deletions(-) diff --git a/drivers/of/irq.c b/drivers/of/irq.c index b10f015b2e37..27a5173c813c 100644 --- a/drivers/of/irq.c +++ b/drivers/of/irq.c @@ -76,6 +76,36 @@ struct device_node *of_irq_find_parent(struct device_node *child) } EXPORT_SYMBOL_GPL(of_irq_find_parent); +/* + * These interrupt controllers abuse interrupt-map for unspeakable + * reasons and rely on the core code to *ignore* it (the drivers do + * their own parsing of the property). + * + * If you think of adding to the list for something *new*, think + * again. There is a high chance that you will be sent back to the + * drawing board. + */ +static const char * const of_irq_imap_abusers[] = { + "CBEA,platform-spider-pic", + "sti,platform-spider-pic", + "realtek,rtl-intc", + "fsl,ls1021a-extirq", + "fsl,ls1043a-extirq", + "fsl,ls1088a-extirq", + "renesas,rza1-irqc", +}; + +static bool of_irq_abuses_interrupt_map(struct device_node *np) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(of_irq_imap_abusers); i++) + if (of_device_is_compatible(np, of_irq_imap_abusers[i])) + return true; + + return false; +} + /** * of_irq_parse_raw - Low level interrupt tree parsing * @addr: address specifier (start of "reg" property of the device) in be32 format @@ -159,12 +189,15 @@ int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq) /* * Now check if cursor is an interrupt-controller and * if it is then we are done, unless there is an - * interrupt-map which takes precedence. + * interrupt-map which takes precedence if we're not + * in presence of once of these broken platform that + * want to parse interrupt-map themselves for $reason. */ bool intc = of_property_read_bool(ipar, "interrupt-controller"); imap = of_get_property(ipar, "interrupt-map", &imaplen); - if (imap == NULL && intc) { + if (intc && (imap == NULL || + (imap && of_irq_abuses_interrupt_map(ipar)))) { pr_debug(" -> got it !\n"); return 0; } -- 2.30.2