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=-8.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 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 BAD5EC49ED7 for ; Mon, 16 Sep 2019 10:35:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8F7DC21670 for ; Mon, 16 Sep 2019 10:35:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="rV7iLfdP" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730795AbfIPKfX (ORCPT ); Mon, 16 Sep 2019 06:35:23 -0400 Received: from hqemgate15.nvidia.com ([216.228.121.64]:18437 "EHLO hqemgate15.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725951AbfIPKfX (ORCPT ); Mon, 16 Sep 2019 06:35:23 -0400 Received: from hqpgpgate102.nvidia.com (Not Verified[216.228.121.13]) by hqemgate15.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Mon, 16 Sep 2019 03:35:27 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate102.nvidia.com (PGP Universal service); Mon, 16 Sep 2019 03:35:22 -0700 X-PGP-Universal: processed; by hqpgpgate102.nvidia.com on Mon, 16 Sep 2019 03:35:22 -0700 Received: from DRHQMAIL107.nvidia.com (10.27.9.16) by HQMAIL105.nvidia.com (172.20.187.12) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Mon, 16 Sep 2019 10:35:21 +0000 Received: from [10.21.132.148] (10.124.1.5) by DRHQMAIL107.nvidia.com (10.27.9.16) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Mon, 16 Sep 2019 10:35:19 +0000 Subject: Re: [PATCH v4] dmaengine: tegra210-adma: fix transfer failure To: Sameer Pujar , , CC: , , , References: <1568626513-16541-1-git-send-email-spujar@nvidia.com> From: Jon Hunter Message-ID: <13f32a5b-7c90-4909-bb23-fe95c572857c@nvidia.com> Date: Mon, 16 Sep 2019 11:35:17 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <1568626513-16541-1-git-send-email-spujar@nvidia.com> X-Originating-IP: [10.124.1.5] X-ClientProxiedBy: HQMAIL101.nvidia.com (172.20.187.10) To DRHQMAIL107.nvidia.com (10.27.9.16) Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 7bit DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1568630127; bh=S6NL50hAM1XR14TGnyKj929JaX+MCLO9cOEicP+6BQY=; h=X-PGP-Universal:Subject:To:CC:References:From:Message-ID:Date: User-Agent:MIME-Version:In-Reply-To:X-Originating-IP: X-ClientProxiedBy:Content-Type:Content-Language: Content-Transfer-Encoding; b=rV7iLfdPkuQNJH6FByxfyE2O0irJTdfWvXHzlrt9mpW2upXW6Ep/Y6p9Shzg8eMK6 rddtXEu/dFlm+hoDbVQI0QUJFL5qRxL5DfC2Us/x20v6l9/+BD7iWl7risPHxrwVpH qE3IhziqMDON4cjIA9Wo54qGT4AwuB7r2m6hZn3EUyXP5LgJvg8xzOurR7hp7A8u0M bQHqlHELFlBGI22VqcyY7RmhoxuifXHLeG2HWm7oNcjzc44QoiePbYi9HIni4za94i fqlzKIFCTGasUIvoOx8XD5nearEfsp0n9FmOT/S/jjyFltLVwfDwUMfXiHjbO29Mkr UZnMS50ot8NCA== Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org On 16/09/2019 10:35, Sameer Pujar wrote: > From Tegra186 onwards OUTSTANDING_REQUESTS field is added in channel > configuration register(bits 7:4) which defines the maximum number of reads > from the source and writes to the destination that may be outstanding at > any given point of time. This field must be programmed with a value > between 1 and 8. A value of 0 will prevent any transfers from happening. > > Thus added 'has_outstanding_reqs' bool member in chip data structure and is > set to false for Tegra210, since the field is not applicable. For Tegra186 > it is set to true and channel configuration is updated with maximum > outstanding requests. > > Fixes: 433de642a76c ("dmaengine: tegra210-adma: add support for Tegra186/Tegra194") > Cc: stable@vger.kernel.org > > Signed-off-by: Sameer Pujar > --- > drivers/dma/tegra210-adma.c | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/drivers/dma/tegra210-adma.c b/drivers/dma/tegra210-adma.c > index 5f8adf5..6e12685 100644 > --- a/drivers/dma/tegra210-adma.c > +++ b/drivers/dma/tegra210-adma.c > @@ -40,6 +40,7 @@ > #define ADMA_CH_CONFIG_MAX_BURST_SIZE 16 > #define ADMA_CH_CONFIG_WEIGHT_FOR_WRR(val) ((val) & 0xf) > #define ADMA_CH_CONFIG_MAX_BUFS 8 > +#define TEGRA186_ADMA_CH_CONFIG_OUTSTANDING_REQS(reqs) (reqs << 4) > > #define ADMA_CH_FIFO_CTRL 0x2c > #define TEGRA210_ADMA_CH_FIFO_CTRL_TXSIZE(val) (((val) & 0xf) << 8) > @@ -77,6 +78,7 @@ struct tegra_adma; > * @ch_req_tx_shift: Register offset for AHUB transmit channel select. > * @ch_req_rx_shift: Register offset for AHUB receive channel select. > * @ch_base_offset: Register offset of DMA channel registers. > + * @has_outstanding_reqs: If DMA channel can have outstanding requests. > * @ch_fifo_ctrl: Default value for channel FIFO CTRL register. > * @ch_req_mask: Mask for Tx or Rx channel select. > * @ch_req_max: Maximum number of Tx or Rx channels available. > @@ -95,6 +97,7 @@ struct tegra_adma_chip_data { > unsigned int ch_req_max; > unsigned int ch_reg_size; > unsigned int nr_channels; > + bool has_outstanding_reqs; > }; > > /* > @@ -594,6 +597,8 @@ static int tegra_adma_set_xfer_params(struct tegra_adma_chan *tdc, > ADMA_CH_CTRL_FLOWCTRL_EN; > ch_regs->config |= cdata->adma_get_burst_config(burst_size); > ch_regs->config |= ADMA_CH_CONFIG_WEIGHT_FOR_WRR(1); > + if (cdata->has_outstanding_reqs) > + ch_regs->config |= TEGRA186_ADMA_CH_CONFIG_OUTSTANDING_REQS(8); > ch_regs->fifo_ctrl = cdata->ch_fifo_ctrl; > ch_regs->tc = desc->period_len & ADMA_CH_TC_COUNT_MASK; > > @@ -778,6 +783,7 @@ static const struct tegra_adma_chip_data tegra210_chip_data = { > .ch_req_tx_shift = 28, > .ch_req_rx_shift = 24, > .ch_base_offset = 0, > + .has_outstanding_reqs = false, > .ch_fifo_ctrl = TEGRA210_FIFO_CTRL_DEFAULT, > .ch_req_mask = 0xf, > .ch_req_max = 10, > @@ -792,6 +798,7 @@ static const struct tegra_adma_chip_data tegra186_chip_data = { > .ch_req_tx_shift = 27, > .ch_req_rx_shift = 22, > .ch_base_offset = 0x10000, > + .has_outstanding_reqs = true, > .ch_fifo_ctrl = TEGRA186_FIFO_CTRL_DEFAULT, > .ch_req_mask = 0x1f, > .ch_req_max = 20, > Acked-by: Jon Hunter Cheers Jon -- nvpublic