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Fri, 8 May 2020 18:49:19 +0000 From: Vineet Gupta To: Andy Shevchenko , Serge Semin Subject: Re: [PATCH v2 3/6] dmaengine: dw: Set DMA device max segment size parameter Thread-Topic: [PATCH v2 3/6] dmaengine: dw: Set DMA device max segment size parameter Thread-Index: AQHWJSrw/8Ye7R9luE+OOOxxh6OCIqieiGqA Date: Fri, 8 May 2020 18:49:18 +0000 Message-ID: <5c83eabd-08c9-fdae-d13f-49c177b6c5bf@synopsys.com> References: <20200306131048.ADBE18030797@mail.baikalelectronics.ru> <20200508105304.14065-1-Sergey.Semin@baikalelectronics.ru> <20200508105304.14065-4-Sergey.Semin@baikalelectronics.ru> <20200508112152.GI185537@smile.fi.intel.com> In-Reply-To: <20200508112152.GI185537@smile.fi.intel.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 authentication-results: linux.intel.com; dkim=none (message not signed) header.d=none;linux.intel.com; dmarc=none action=none header.from=synopsys.com; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-snps-arc" Errors-To: linux-snps-arc-bounces+linux-snps-arc=archiver.kernel.org@lists.infradead.org On 5/8/20 4:21 AM, Andy Shevchenko wrote: > Yeah, I have locally something like this and I didn't dare to upstream because > there is an issue. We have this information per DMA controller, while we > actually need this on per DMA channel basis. > > Above will work only for synthesized DMA with all channels having same block > size. That's why above conditional is not needed anyway. > > OTOH, I never saw the DesignWare DMA to be synthesized differently (I remember > that Intel Medfield has interesting settings, but I don't remember if DMA > channels are different inside the same controller). > > Vineet, do you have any information that Synopsys customers synthesized DMA > controllers with different channel characteristics inside one DMA IP? The IP drivers are done by different teams, but I can try and ask around. _______________________________________________ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc