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Mon, 12 May 2025 07:38:13 -0700 (PDT) Received: from [10.229.41.21] ([192.19.176.250]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-442d67df574sm126777665e9.11.2025.05.12.07.38.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 12 May 2025 07:38:12 -0700 (PDT) Message-ID: Date: Mon, 12 May 2025 16:38:10 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: mtd: rawnand: brcmnand: exec_op patch broke < v5.0 controllers To: =?UTF-8?Q?=C3=81lvaro_Fern=C3=A1ndez_Rojas?= , dregan@broadcom.com, Miquel Raynal , bcm-kernel-feedback-list , MTD Maling List , =?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?= , Brian Norris , dan.beygelman@broadcom.com, William Zhang , frieder.schrempf@kontron.de, Linux Kernel Mailing List , Vignesh R , Richard Weinberger , bbrezillon@kernel.org, Kamal Dasu , liao jaime , kilobyte@angband.pl, Jonas Gorski , dgcbueu References: Content-Language: en-US From: Florian Fainelli Autocrypt: addr=florian.fainelli@broadcom.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 5/11/2025 11:42 AM, Álvaro Fernández Rojas wrote: > Hi David, > > I've just realized that your exec_op implementation patch broke > support of v2.1, v2.2 and v4.0 controllers. > https://github.com/torvalds/linux/commit/3c8260ce76634291aed877032a41e373884d69e4 > https://patchwork.ozlabs.org/project/linux-mtd/patch/20231125012438.15191-4-dregan@broadcom.com/ > I know it's an old patch from 6.8 but I just discovered this while > trying to add 6.12 support for bmips on OpenWrt (from 6.6): > https://github.com/openwrt/openwrt/pull/18746 > > The issue is that low level ops always return 0 on v4.0 controllers > and v2.1/v2.2 controllers don't even have the low level registers > defined: > https://github.com/torvalds/linux/blob/3ce9925823c7d6bb0e6eb951bf2db0e9e182582d/drivers/mtd/nand/raw/brcmnand/brcmnand.c#L357 > https://github.com/torvalds/linux/blob/3ce9925823c7d6bb0e6eb951bf2db0e9e182582d/drivers/mtd/nand/raw/brcmnand/brcmnand.c#L371 > > I guess that restoring the legacy functions isn't going to happen, but > is it possible to restore < v5.0 compatibility on the new exec_op > implementation? Unfortunately, I don't think we have any other choice unless we want to have a functional NAND driver for these older chips. Would you be willing to do that? Thanks -- Florian