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Tue, 06 Feb 2024 19:08:41 +0100 Message-ID: <42e760f9-8304-4237-bb68-54c98eb7fcb9@gmx.net> Date: Tue, 6 Feb 2024 19:08:40 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 02/12] bcm2835-dma: Add proper 40-bit DMA support To: Dave Stevenson , Andrea della Porta Cc: Vinod Koul , Florian Fainelli , Ray Jui , Scott Branden , Broadcom internal kernel review list , dmaengine@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Maxime Ripard , Dom Cobley , Phil Elwell References: <8736c115-e11c-41ca-85eb-7cd19a205068@gmx.net> Content-Language: en-US From: Stefan Wahren In-Reply-To: X-Provags-ID: V03:K1:82iQlRV0DZeC1hAWFcigJgICSkiPyPuQqoLMtpl5EGz6/okZ3fE I6SidVufMLwq7EC1vruL05BJaE5u0q/VGaSys3AbvrQD8uxR2U+HsJwuTKDo5d3Jp5L3eMs HUDAajmfPFfluKH+FrQfUop7UA4q95fLfhJz9IwiXwrmlfh4WuldAkk0RfUs/XNMQIcSjPa K6Eu6Kwlz66lDe5rQyf1Q== UI-OutboundReport: notjunk:1;M01:P0:rGYYoGkFhs8=;E2CkH0DchG7qHZki2J7Pqf6e/Y9 O3nyAvJr4ZdrVhtDOWtSV0gngMgbdBULBSXrol6BvL01MoaQe4/QT9yCZm40aSu6voYAuZHIO ZqXjplQMVZnxpYbIzb7eL+FJY7vu/f32oMjjCIZRPrlwsdY32Axp8MVdGqWa06gCGB6xsW507 sqOtxghlNUeAQg59SSY1fnDYY/QfXlwwnobXi9iX4C7ucy+ERlWp+RMZxgjtTA1Oy9NvL7tED dtXxZMfHZaMai1TCQ3Nndy2p4GxoryYiXRXeKeW2F+6Rd8i2XsY18iVP3bPjcCXr6nHHfHTd0 TaKCmnryV8KOdpwH0W3bfmWtHfqbuFLyj4jiPp3VZpDRtWQP1nfh3/RabAxasiyYKqIhdM3T/ bEaqIjAPBMGzYxnOqsMN36FdboKiQs9BdLAYag0tCRJZcCROQB9VGgEH2WQcX+t9UTK3e888Q cmnyjtwKGacbndniuFapznFbuuCq8eKcR57rg2i6AyMoLORYL9CL7KdJgsSRyq/ki4LFptnR/ BdhCGGaSB9jvcNg6SH2kkaw77h9ilJr88qHQtQ5LHAnL+vBkCLmwoHKYbv4MvdYL3gzt0Y/A+ +7k0iHQhKzrsayGAPU2UG1YvmpWSSgZeQZ/zPikBWypK6QY70/lmVZDdmSnVf9rO2OfJ+aZpB OLCSJWUfFGysEyLGopIqhGKGFuWa1oXXQeIKNyRnb+a2x0Rnmes8J/UljrIb4Gnp3pWMV39I5 LlYEI0RdK130rVHsUe91Z4I2liPtv5MUTVEfkhIEsBA88plryq3ZRuCfQOBnIO59uM49xbNhm xB8k7jy4E6JboWXln/ta28Nm31V+2fM/B0X+WTMNC0zPU= X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240206_100851_232237_4B1762E6 X-CRM114-Status: GOOD ( 17.75 ) 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: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Dave and Andrea, Am 06.02.24 um 17:31 schrieb Dave Stevenson: > Hi Stefan and Andrea > > On Mon, 5 Feb 2024 at 18:50, Stefan Wahren wrote: >> Hi Andrea, >> >> [add Dave] >> >> Am 04.02.24 um 07:59 schrieb Andrea della Porta: >>> From: Phil Elwell >>> >>> BCM2711 has 4 DMA channels with a 40-bit address range, allowing them >>> to access the full 4GB of memory on a Pi 4. >>> >>> Cc: Phil Elwell >>> Cc: Maxime Ripard >>> Signed-off-by: Andrea della Porta >> mainlining isn't that simple by sending just the downstream patches to >> the mailing list. In many cases there reasons why this hasn't been >> upstreamed yet. >> >> In my opinion just this feature is worth a separate patch series. In >> 2021 i already send an initial version, which tried to implement it in a >> cleaner & maintainabler way [1]. In the meantime Dave Stevenson from >> Raspberry Pi wrote that he also wanted to work on this. Maybe you want >> to work on this together? > Yes, I'm looking at reworking Stefan's series to work on Pi4 & Pi5 as > it's needed for HDMI audio (and other things) on those platforms which > I'm working to upstream. > > I was getting weirdness from the sdhci block when I was last looking > at it, so it was just proving a little trickier than first thought. > Hopefully I'll get some time on it in the next couple of weeks. i must confess that my series was just a draft to see that the general approach would be accepted. Yes, it's possible that there are issues :-( Maybe i can help you a little bit by taking care of first two patches (node name fix & YAML conversion)? Regards > Dave > >> [1] - >> https://lore.kernel.org/linux-arm-kernel/13ec386b-2305-27da-9765-8fa3ad71146c@i2se.com/T/ _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel