From patchwork Tue May 26 22:50:18 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 11571551 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 75550739 for ; Tue, 26 May 2020 22:52:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5AE7B2078C for ; Tue, 26 May 2020 22:52:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404643AbgEZWvx (ORCPT ); Tue, 26 May 2020 18:51:53 -0400 Received: from mail.baikalelectronics.com ([87.245.175.226]:60342 "EHLO mail.baikalelectronics.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404599AbgEZWvu (ORCPT ); Tue, 26 May 2020 18:51:50 -0400 Received: from localhost (unknown [127.0.0.1]) by mail.baikalelectronics.ru (Postfix) with ESMTP id 3A777803086E; Tue, 26 May 2020 22:51:43 +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 ObhvQUEQbJqY; Wed, 27 May 2020 01:51:42 +0300 (MSK) From: Serge Semin To: Vinod Koul , Viresh Kumar , Andy Shevchenko , Dan Williams CC: Serge Semin , Serge Semin , Alexey Malahov , Thomas Bogendoerfer , Arnd Bergmann , Rob Herring , , , , Subject: [PATCH v3 07/10] dmaengine: dw: Set DMA device max segment size parameter Date: Wed, 27 May 2020 01:50:18 +0300 Message-ID: <20200526225022.20405-8-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 Maximum block size DW DMAC configuration corresponds to the max segment size DMA parameter in the DMA core subsystem notation. Lets set it with a value specific to the probed DW DMA controller. It shall help the DMA clients to create size-optimized SG-list items for the controller. This in turn will cause less dw_desc allocations, less LLP reinitializations, better DMA device performance. Signed-off-by: Serge Semin Cc: Alexey Malahov Cc: Thomas Bogendoerfer Cc: Arnd Bergmann Cc: Rob Herring Cc: linux-mips@vger.kernel.org Cc: devicetree@vger.kernel.org --- Changelog v2: - This is a new patch created in place of the dropped one: "dmaengine: dw: Add LLP and block size config accessors". Changelog v3: - Use the block_size found for the very first channel instead of looking for the maximum of maximum block sizes. - Don't define device-specific device_dma_parameters object, since it has already been defined by the platform device core. --- drivers/dma/dw/core.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c index 33e99d95b3d3..fb95920c429e 100644 --- a/drivers/dma/dw/core.c +++ b/drivers/dma/dw/core.c @@ -1229,6 +1229,13 @@ int do_dma_probe(struct dw_dma_chip *chip) BIT(DMA_MEM_TO_MEM); dw->dma.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; + /* + * For now there is no hardware with non uniform maximum block size + * across all of the device channels, so we set the maximum segment + * size as the block size found for the very first channel. + */ + dma_set_max_seg_size(dw->dma.dev, dw->chan[0].block_size); + err = dma_async_device_register(&dw->dma); if (err) goto err_dma_register;