From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vinod Koul Subject: Re: [PATCH 0/5] dmaengine: ti: edma: Multicore usage related fixes Date: Wed, 4 Sep 2019 15:19:56 +0530 Message-ID: <20190904094956.GT2672@vkoul-mobl> References: <20190823125618.8133-1-peter.ujfalusi@ti.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20190823125618.8133-1-peter.ujfalusi@ti.com> Sender: linux-kernel-owner@vger.kernel.org To: Peter Ujfalusi Cc: robh+dt@kernel.org, dan.j.williams@intel.com, dmaengine@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org List-Id: devicetree@vger.kernel.org On 23-08-19, 15:56, Peter Ujfalusi wrote: > Hi, > > When other cores want to use EDMA for their use cases Linux was not playing > nicely. > By design EDMA is supporting shared use with shadow regions. Linux is using > region0, others can be used by other cores. > > In order to not break multicore shared usage of EDMA: > - do not reset paRAM slots which is not allocated for Linux (reserved paRAM > slots) > - Only reset region0 access registers, do not touch other regions > - Add option for reserved channels which should not be used by Linux in a similar > fashion as we already have for reserved paRAM slots. Applied 1 to 3, thanks -- ~Vinod