From patchwork Tue May 26 22:50:16 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 11571545 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 09C72739 for ; Tue, 26 May 2020 22:51:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F023D2075F for ; Tue, 26 May 2020 22:51:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404627AbgEZWvt (ORCPT ); Tue, 26 May 2020 18:51:49 -0400 Received: from mail.baikalelectronics.com ([87.245.175.226]:60328 "EHLO mail.baikalelectronics.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404585AbgEZWvs (ORCPT ); Tue, 26 May 2020 18:51:48 -0400 Received: from localhost (unknown [127.0.0.1]) by mail.baikalelectronics.ru (Postfix) with ESMTP id C196F803086D; Tue, 26 May 2020 22:51:41 +0000 (UTC) X-Virus-Scanned: amavisd-new at baikalelectronics.ru Received: from mail.baikalelectronics.ru ([127.0.0.1]) by localhost (mail.baikalelectronics.ru [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id tkuLQxpXQUSi; Wed, 27 May 2020 01:51:41 +0300 (MSK) From: Serge Semin To: Vinod Koul , Viresh Kumar , Dan Williams CC: Serge Semin , Serge Semin , Alexey Malahov , Thomas Bogendoerfer , Arnd Bergmann , Andy Shevchenko , Rob Herring , , , , Subject: [PATCH v3 05/10] dmaengine: Introduce DMA-device device_caps callback Date: Wed, 27 May 2020 01:50:16 +0300 Message-ID: <20200526225022.20405-6-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20200526225022.20405-1-Sergey.Semin@baikalelectronics.ru> References: <20200526225022.20405-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org There are DMA devices (like ours version of Synopsys DW DMAC) which have DMA capabilities non-uniformly redistributed amongst the device channels. In order to provide a way of exposing the channel-specific parameters to the DMA engine consumers, we introduce a new DMA-device callback. In case if provided it gets called from the dma_get_slave_caps() method and is able to override the generic DMA-device capabilities. Signed-off-by: Serge Semin Cc: Alexey Malahov Cc: Thomas Bogendoerfer Cc: Arnd Bergmann Cc: Andy Shevchenko Cc: Rob Herring Cc: linux-mips@vger.kernel.org Cc: devicetree@vger.kernel.org --- Changelog v3: - This is a new patch created as a result of the discussion with Vinod and Andy in the framework of DW DMA burst and LLP capabilities. --- drivers/dma/dmaengine.c | 3 +++ include/linux/dmaengine.h | 2 ++ 2 files changed, 5 insertions(+) diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index ad56ad58932c..edbb11d56cde 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -599,6 +599,9 @@ int dma_get_slave_caps(struct dma_chan *chan, struct dma_slave_caps *caps) caps->cmd_resume = !!device->device_resume; caps->cmd_terminate = !!device->device_terminate_all; + if (device->device_caps) + device->device_caps(chan, caps); + return 0; } EXPORT_SYMBOL_GPL(dma_get_slave_caps); diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 6801200c76b6..429eef3a702b 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -899,6 +899,8 @@ struct dma_device { struct dma_chan *chan, dma_addr_t dst, u64 data, unsigned long flags); + void (*device_caps)(struct dma_chan *chan, + struct dma_slave_caps *caps); int (*device_config)(struct dma_chan *chan, struct dma_slave_config *config); int (*device_pause)(struct dma_chan *chan);