From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932533AbbAFSeZ (ORCPT ); Tue, 6 Jan 2015 13:34:25 -0500 Received: from mho-02-ewr.mailhop.org ([204.13.248.72]:58277 "EHLO mho-02-ewr.mailhop.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755544AbbAFSeY (ORCPT ); Tue, 6 Jan 2015 13:34:24 -0500 X-Mail-Handler: Dyn Standard SMTP by Dyn X-Originating-IP: 104.193.169.186 X-Report-Abuse-To: abuse@dyndns.com (see http://www.dyndns.com/services/sendlabs/outbound_abuse.html for abuse reporting information) X-MHO-User: U2FsdGVkX1+Et/zV/0jaRpFWLUvVJAvr Date: Tue, 6 Jan 2015 10:30:22 -0800 From: Tony Lindgren To: Russell King - ARM Linux Cc: Felipe Balbi , Thomas Gleixner , Jason Cooper , Aaro Koskinen , Linux Kernel Mailing List , Pavel Machek , Santosh Shilimkar , Peter =?utf-8?Q?K=C3=BCmmel?= , Linux OMAP Mailing List , Linux ARM Kernel Mailing List Subject: Re: [PATCH] irqchip: omap-intc: fix legacy DMA regression Message-ID: <20150106183021.GV4081@atomide.com> References: <20150106123830.GD30544@fuloong-minipc.musicnaut.iki.fi> <1420563093-26026-1-git-send-email-balbi@ti.com> <20150106180532.GO11502@n2100.arm.linux.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150106180532.GO11502@n2100.arm.linux.org.uk> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Russell King - ARM Linux [150106 10:08]: > On Tue, Jan 06, 2015 at 10:51:33AM -0600, Felipe Balbi wrote: > > + /* > > + * 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. > > "finally fixed" or finally killed off like it really needs to be, once > all users of it are killed. > > We've been trying to do this for, what, three years now... I finally > pushed a WARN_ON() into that code to make it obvious to anyone who > uses omap_request_dma() that they really need to update their code. > > Here's the list of references to that symbol which *still* need to be > fixed so that we can kill the legacy DMA driver: > > drivers/media/platform/omap/omap_vout_vrfb.c: ret = omap_request_dma(vout->vrfb_dma_tx.dev_id, "VRFB DMA TX", > drivers/media/platform/omap3isp/isphist.c: ret = omap_request_dma(OMAP24XX_DMA_NO_DEVICE, "DMA_ISP_HIST", > drivers/media/platform/soc_camera/omap1_camera.c: err = omap_request_dma(OMAP_DMA_CAMERA_IF_RX, DRIVER_NAME, > drivers/mtd/onenand/omap2.c: r = omap_request_dma(0, pdev->dev.driver->name, AFAIK we should just remove DMA support from the drivers above. Nobody seems to be interested in doing anything about them. > drivers/usb/gadget/udc/omap_udc.c: status = omap_request_dma(dma_channel, > drivers/usb/gadget/udc/omap_udc.c: status = omap_request_dma(dma_channel, OK so Aaro picked this one. > drivers/usb/musb/tusb6010_omap.c: ret = omap_request_dma(chdat->sync_dev, dev_name, > drivers/usb/musb/tusb6010_omap.c: ret = omap_request_dma(tusb_dma->sync_dev, "TUSB shared", I'll update this one. FYI, I already have some work-in-progress MUSB DMA patches that allow building in all the MUSB DMA glue layers. I just need to finish that series for v3.20: https://git.kernel.org/cgit/linux/kernel/git/tmlind/linux-omap.git/log/?h=musb-dma-2014-11-25-v2 So converting tusb6010 over to the dmaengine API would be the next logical step after that series. Probably not going to happen before v3.21 though.. Regards, Tony