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Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1t3XTJ-0000000DkST-3rYd; Wed, 23 Oct 2024 09:16:05 +0000 Received: from nyc.source.kernel.org ([147.75.193.91]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1t3XDx-0000000Dg6a-0BdL for linux-arm-kernel@lists.infradead.org; Wed, 23 Oct 2024 09:00:14 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id DC776A4498A; Wed, 23 Oct 2024 09:00:02 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 783ADC4CEC7; Wed, 23 Oct 2024 09:00:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729674011; bh=hfXXhjN8IBJs2miuXdU3mNQG85wax8LY7e36g/COuxE=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=t31n1GEmRRzHzzXXxA1f+Nm+OkfDgsCiRvZrGlyDE89ZMgc09HTmRMNigyFkXdV/U Pj5L/JWTFfyjUwW0EC0tkPComEAa+ltVdZetx2WrdxxyyIq6nd9YDbpJVL1eypwQlU N+shisCk8toZ88D61nLZ+1+2uqmQKu3fbfW25C/2cIhNqePNYDldq4NUCCWjFphsR9 2USemQI4SNQYT+d9HvFRGgvXv3A21NAypPo0O7BOGIEDUFgABgqL8/pneRg1pR0KEM /6tO8a7PxnjVvjsiDCRzXk6IiAl0UFyw0p6AqJQlBhs1Vi8sY8AFgztAyzKMs9HYNH QCdNWjl9sUk+w== Message-ID: <1e76bc70-21a6-4ac7-99ea-30a7ccf387bb@kernel.org> Date: Wed, 23 Oct 2024 11:00:04 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/2] firmware: add exynos acpm driver To: Tudor Ambarus , jassisinghbrar@gmail.com Cc: alim.akhtar@samsung.com, mst@redhat.com, javierm@redhat.com, tzimmermann@suse.de, bartosz.golaszewski@linaro.org, luzmaximilian@gmail.com, sudeep.holla@arm.com, conor.dooley@microchip.com, bjorn@rivosinc.com, ulf.hansson@linaro.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, marcan@marcan.st, neal@gompa.dev, alyssa@rosenzweig.io, broonie@kernel.org, andre.draszik@linaro.org, willmcvicker@google.com, peter.griffin@linaro.org, kernel-team@android.com, vincent.guittot@linaro.org, daniel.lezcano@linaro.org References: <20241017163649.3007062-1-tudor.ambarus@linaro.org> <20241017163649.3007062-3-tudor.ambarus@linaro.org> <955530a5-ef88-4ed1-94cf-fcd48fd248b2@kernel.org> <1ece02e6-bf78-443a-8143-a54e94dd744c@kernel.org> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241023_020013_253675_FC23E9F0 X-CRM114-Status: GOOD ( 17.59 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 22/10/2024 09:58, Tudor Ambarus wrote: > >>>> >>>> I also cannot find any piece of code setting several of above, e.g. tx_base >>> >>> I'm not writing any SRAM configuration fields, these fields are used to >>> read/retrive the channel parameters from SRAM. >> >> I meany tx_base is always 0. Where is this property set? Ever? > > It's not zero. My assumption is it is set in the acpm firmware, but I Where is any assignment to this member? > don't have access to that to verify. Here are some debug prints made in > the linux driver: > > [ 0.069575][ T1] gs-acpm-ipc 17610000.mailbox: > exynos_mbox_chan_init ID = 2 poll = 1, mlen = 16, qlen = 5 > [ 0.069927][ T1] gs-acpm-ipc 17610000.mailbox: > exynos_mbox_chan_init ID = 2 offsets: rx_base = 0x00038290 rx_front = > 0x0003828c, rx_rear = 0x00038288 > [ 0.070449][ T1] gs-acpm-ipc 17610000.mailbox: > exynos_mbox_chan_init ID = 2 offsets: tx_base = 0x000382f0 tx_front = > 0x000382ec, tx_rear = 0x000382e8 > > > tx_base contains the SRAM offset of the RX queue used in linux. The > offset is relative to the base address of the SRAM config data. > > tx_base is seen/named from the firmware's point of view, thus named TX. > I assume the same struct is defined in the acpm firmware. > > > Somewhere below in the linux driver I get the RX ring base address by doing: > > rx->base = exynos_acpm_get_iomem_addr(base, &shmem_chan->tx_base); tx_base is still 0. > > where base is the SRAM base address of the channels configuration data. > > static void __iomem *exynos_acpm_get_iomem_addr(void __iomem *base, > > > void __iomem *addr) > > > { > > > u32 offset; > > > > > > offset = readl_relaxed(addr); > > > return base + offset; > > > } > > Hope this clarifies a bit these struct members. No, where is tx_base assigned? Best regards, Krzysztof