From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_PASS,T_DKIMWL_WL_HIGH,URIBL_BLOCKED, USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5BD58C3279B for ; Tue, 10 Jul 2018 15:33:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 08E73208F7 for ; Tue, 10 Jul 2018 15:33:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="hRVAKyqD" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 08E73208F7 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934057AbeGJPdh (ORCPT ); Tue, 10 Jul 2018 11:33:37 -0400 Received: from mail.kernel.org ([198.145.29.99]:51642 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754260AbeGJPdf (ORCPT ); Tue, 10 Jul 2018 11:33:35 -0400 Received: from localhost (unknown [106.200.232.130]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 6618D208EB; Tue, 10 Jul 2018 15:33:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1531236815; bh=uo4nkp/+GVkjqV4NlAFGWkZyTk73wKIALNb1IBVOG7o=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=hRVAKyqD75gPs4Tzr5LOajLlsRDbM35eSyz6HjVnnIW8S/GAKZnDbOyUkI60YaITs Ai/9ZXzWAxjjmDtR06TSrbvLCD1cMQU2ZCC5bu7Az6k7uyLEyBeld8EzbMEDwRiU9F Crx78HCq7PNkyW3oYc9Or0z3kxfkhOlhfsBAKJkg= Date: Tue, 10 Jul 2018 21:03:26 +0530 From: Vinod To: Robin Gong Cc: dan.j.williams@intel.com, shawnguo@kernel.org, s.hauer@pengutronix.de, fabio.estevam@nxp.com, linux@armlinux.org.uk, linux-arm-kernel@lists.infradead.org, kernel@pengutronix.de, dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, linux-imx@nxp.com Subject: Re: [PATCH v1 3/4] dmaengine: imx-sdma: support dmatest Message-ID: <20180710153326.GG3219@vkoul-mobl> References: <1531239793-11781-1-git-send-email-yibin.gong@nxp.com> <1531239793-11781-4-git-send-email-yibin.gong@nxp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1531239793-11781-4-git-send-email-yibin.gong@nxp.com> User-Agent: Mutt/1.9.2 (2017-12-15) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11-07-18, 00:23, Robin Gong wrote: > dmatest(memcpy) will never call dmaengine_slave_config before prep, and that should have been a hint to you that you should not expect that > so jobs in dmaengine_slave_config need to be moved into somewhere > before device_prep_dma_memcpy. Besides, dmatest never setup chan > ->private as other common case like uart/audio/spi will always setup > chan->private. Here check it to judge if it's dmatest case and do > jobs in slave_config. and you should not do anything for dmatest. Supporting it means memcpy implementation is not correct :) > > Signed-off-by: Robin Gong > --- > drivers/dma/imx-sdma.c | 37 ++++++++++++++++++++++++++++--------- > 1 file changed, 28 insertions(+), 9 deletions(-) > > diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c > index ed2267d..48f3749 100644 > --- a/drivers/dma/imx-sdma.c > +++ b/drivers/dma/imx-sdma.c > @@ -1222,10 +1222,36 @@ static int sdma_alloc_chan_resources(struct dma_chan *chan) > { > struct sdma_channel *sdmac = to_sdma_chan(chan); > struct imx_dma_data *data = chan->private; > + struct imx_dma_data default_data; > int prio, ret; > > - if (!data) > - return -EINVAL; > + ret = clk_enable(sdmac->sdma->clk_ipg); > + if (ret) > + return ret; > + ret = clk_enable(sdmac->sdma->clk_ahb); > + if (ret) > + goto disable_clk_ipg; > + /* > + * dmatest(memcpy) will never call dmaengine_slave_config before prep, > + * so jobs in dmaengine_slave_config need to be moved into somewhere > + * before device_prep_dma_memcpy. Besides, dmatest never setup chan > + * ->private as other common cases like uart/audio/spi will setup > + * chan->private always. Here check it to judge if it's dmatest case > + * and do jobs in slave_config. > + */ > + if (!data) { > + dev_warn(sdmac->sdma->dev, "dmatest is running?\n"); why is that a warning! > + sdmac->word_size = sdmac->sdma->dma_device.copy_align; > + default_data.priority = 2; > + default_data.peripheral_type = IMX_DMATYPE_MEMORY; > + default_data.dma_request = 0; > + default_data.dma_request2 = 0; > + data = &default_data; > + > + sdma_config_ownership(sdmac, false, true, false); > + sdma_get_pc(sdmac, IMX_DMATYPE_MEMORY); > + sdma_load_context(sdmac); > + } this needs to be default for memcpy -- ~Vinod