From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755872AbbAFQxE (ORCPT ); Tue, 6 Jan 2015 11:53:04 -0500 Received: from devils.ext.ti.com ([198.47.26.153]:60691 "EHLO devils.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755830AbbAFQxC (ORCPT ); Tue, 6 Jan 2015 11:53:02 -0500 From: Felipe Balbi To: Tony Lindgren , Thomas Gleixner , Jason Cooper CC: Aaro Koskinen , Linux ARM Kernel Mailing List , Linux OMAP Mailing List , Linux Kernel Mailing List , =?UTF-8?q?Peter=20K=C3=BCmmel?= , Pavel Machek , Santosh Shilimkar , Felipe Balbi Subject: [PATCH] irqchip: omap-intc: fix legacy DMA regression Date: Tue, 6 Jan 2015 10:51:33 -0600 Message-ID: <1420563093-26026-1-git-send-email-balbi@ti.com> X-Mailer: git-send-email 2.2.0 In-Reply-To: <20150106123830.GD30544@fuloong-minipc.musicnaut.iki.fi> References: <20150106123830.GD30544@fuloong-minipc.musicnaut.iki.fi> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org commit 55601c9f2467 (arm: omap: intc: switch over to linear irq domain) introduced a regression with SDMA legacy driver because that driver strictly depends on INTC's IRQs starting at NR_IRQs. Aparently irq_domain_add_linear() won't guarantee that, since we see a 7 IRQs difference when booting with and without the commit cited above. Until arch/arm/plat-omap/dma.c is properly fixed, we must maintain OMAP2/3 using irq_domain_add_legacy(). A FIXME note was added so people know to delete that code once that legacy DMA driver is fixed up. Fixes: 55601c9f2467 (arm: omap: intc: switch over to linear irq domain) Signed-off-by: Felipe Balbi --- drivers/irqchip/irq-omap-intc.c | 26 +++++++++++++++++++++----- 1 file changed, 21 insertions(+), 5 deletions(-) diff --git a/drivers/irqchip/irq-omap-intc.c b/drivers/irqchip/irq-omap-intc.c index 3c970259c0eb..6ef88f56cf8d 100644 --- a/drivers/irqchip/irq-omap-intc.c +++ b/drivers/irqchip/irq-omap-intc.c @@ -263,7 +263,7 @@ static int __init omap_init_irq_of(struct device_node *node) return ret; } -static int __init omap_init_irq_legacy(u32 base) +static int __init omap_init_irq_legacy(u32 base, struct device_node *node) { int j, irq_base; @@ -277,7 +277,7 @@ static int __init omap_init_irq_legacy(u32 base) irq_base = 0; } - domain = irq_domain_add_legacy(NULL, omap_nr_irqs, irq_base, 0, + domain = irq_domain_add_legacy(node, omap_nr_irqs, irq_base, 0, &irq_domain_simple_ops, NULL); omap_irq_soft_reset(); @@ -301,10 +301,26 @@ static int __init omap_init_irq(u32 base, struct device_node *node) { int ret; - if (node) + /* + * FIXME legacy OMAP DMA driver sitting under arch/arm/plat-omap/dma.c + * depends is still not ready for linear IRQ domains; because of that + * we need to temporarily "blacklist" OMAP2 and OMAP3 devices from using + * linear IRQ Domain until that driver is finally fixed. + */ + if (of_device_is_compatible(node, "ti,omap2-intc") || + of_device_is_compatible(node, "ti,omap3-intc")) { + struct resource res; + + if (of_address_to_resource(node, 0, &res)) + return -ENOMEM; + + base = res.start; + ret = omap_init_irq_legacy(base, node); + } else if (node) { ret = omap_init_irq_of(node); - else - ret = omap_init_irq_legacy(base); + } else { + ret = omap_init_irq_legacy(base, NULL); + } if (ret == 0) omap_irq_enable_protection(); -- 2.2.0