From mboxrd@z Thu Jan 1 00:00:00 1970 From: Russell King - ARM Linux admin Subject: Re: [PATCH 02/10] ARM: disable CONFIG_IDE in footbridge_defconfig Date: Fri, 19 Mar 2021 17:53:12 +0000 Message-ID: <20210319175311.GW1463@shell.armlinux.org.uk> References: <20210318045706.200458-1-hch@lst.de> <20210318045706.200458-3-hch@lst.de> <20210319170753.GV1463@shell.armlinux.org.uk> Mime-Version: 1.0 Return-path: DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Sender:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=5b5bolNJYoHvpbguUfHCrjOiVB1eiZ/SyLUPdIsBqrE=; b=fapckYyyVxKxd05dheNDlrTlv uFcmGtMwFwzwBPEbnfZHhBlGlW9zqTLadk1HYzxRYAwklFLtV9Ox76oL3XfZFqn6UE1mg/IROkVj3 79f+WCg+fD7E2jnn1NqHDS3WGxIyuIatzqJmPNCsZxFSkCBNJu9EFI0JI2gN0m43clGoTG/R0W/fh oEixbjDCYeE7nceZZwUWWrI/Ve1MweoQ8ZXHSGEwt/4o53r61OjolSZJcVNk3E10ogAN9vvDsQqgy MhUzclWSUDU/yZFF8vu1i02HG9tGrP42frcpWnKzo5X6m8xslMqMzvtfBYxMIR2nmTOd6rlatvgWI vvWNoMRwA==; Content-Disposition: inline In-Reply-To: <20210319170753.GV1463@shell.armlinux.org.uk> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linuxppc-dev-bounces+glppd-linuxppc64-dev=m.gmane-mx.org@lists.ozlabs.org Sender: "Linuxppc-dev" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Christoph Hellwig Cc: Jens Axboe , Thomas Bogendoerfer , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-ide@vger.kernel.org, linux-m68k@lists.linux-m68k.org, Ivan Kokshaysky , linux-alpha@vger.kernel.org, Geert Uytterhoeven , Matt Turner , linuxppc-dev@lists.ozlabs.org, "David S. Miller" , linux-arm-kernel@lists.infradead.org, Richard Henderson On Fri, Mar 19, 2021 at 05:07:53PM +0000, Russell King - ARM Linux admin wrote: > On Thu, Mar 18, 2021 at 05:56:58AM +0100, Christoph Hellwig wrote: > > footbridge_defconfig enables CONFIG_IDE but no actual host controller > > driver, so just drop it. > > I have been using the Cypress 82C693 IDE driver on Footbridge for a > CD ROM drive, and I know it doesn't work with the PATA driver - as > I need to disable BM DMA, otherwise the 82C693/DC21285 combination > deadlocks the PCI bus. The PATA driver doesn't support disabling > BM DMA without disabling it for all PATA ports, which is really > annoying for my IT821x card in the same machine. > > So, I'm rather stuck using the PATA driver for the HDDs and the > IDE driver for the CD ROM. > > That said, a commit a while back "cleaning up" the PCI layer appears > to have totally shafted the 82C693, as the kernel tries to request > IO resources at the legacy IDE addresses against the PCI bus resource > which only covers 0x1000-0xffff. Hence, the 82C693 IDE ports are non- > functional at the moment. > > I'm debating about trying to find a fix to the PCI breakage that was > introduced by "ARM: move PCI i/o resource setup into common code". > > I hadn't noticed it because I don't use the CD ROM drive very often, > and I don't upgrade the kernel that often either on the machine - > but it has been running 24x7 for almost two decades. Okay, a bit more on this... If I extend the arch/arm/kernel/bios32.c code to kill BARs 2/3 (which actually are not present on the CY82C693) then the IDE driver works for me, but the PATA driver does not: cy82c693 0000:00:06.1: IDE controller (0x1080:0xc693 rev 0x00) cy82c693 0000:00:06.1: not 100% native mode: will probe irqs later legacy IDE will be removed in 2021, please switch to libata Report any missing HW support to linux-ide@vger.kernel.org ide0: BM-DMA at 0x1080-0x1087 ide1: BM-DMA at 0x1088-0x108f Probing IDE interface ide0... hda: PIONEER DVD-RW DVR-105, ATAPI CD/DVD-ROM drive hda: host max PIO4 wanted PIO255(auto-tune) selected PIO4 ... (unbind Cypress_IDE and try binding pata_cypress) pata_cypress 0000:00:06.1: no available native port -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!