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=-9.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 7A1DDC282C3 for ; Fri, 25 Jan 2019 02:55:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4AB2B217D7 for ; Fri, 25 Jan 2019 02:55:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=akkea.ca header.i=@akkea.ca header.b="S/T368i0"; dkim=pass (1024-bit key) header.d=akkea.ca header.i=@akkea.ca header.b="S/T368i0" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728770AbfAYCzl (ORCPT ); Thu, 24 Jan 2019 21:55:41 -0500 Received: from node.akkea.ca ([192.155.83.177]:52092 "EHLO node.akkea.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726147AbfAYCzi (ORCPT ); Thu, 24 Jan 2019 21:55:38 -0500 Received: from localhost (localhost [127.0.0.1]) by node.akkea.ca (Postfix) with ESMTP id 941FC4E2051; Fri, 25 Jan 2019 02:55:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=akkea.ca; s=mail; t=1548384937; bh=+JXGIVucnYCY0cluddvyVeHVzItz/VTc2jupzPlE5mk=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=S/T368i0EE27Nh6XHcxhO1cbGHBeLDfxuHZ5N8hx6l+DAEHXkNUG6vShI91PFEH7c fY2Q6hN0bu9dtF7QyKs+brb281XIiCsHYKwnp6xT7gLLuVOupR6Bb0GjzZnF1WjIQ/ CLbrNz2JEkVOPgIILCjns859Z4HZn2A+GGi1/Tcw= X-Virus-Scanned: Debian amavisd-new at mail.akkea.ca Received: from node.akkea.ca ([127.0.0.1]) by localhost (mail.akkea.ca [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id yz-2hxMqnySQ; Fri, 25 Jan 2019 02:55:37 +0000 (UTC) Received: from localhost.localdomain (198-48-167-13.cpe.pppoe.ca [198.48.167.13]) by node.akkea.ca (Postfix) with ESMTPSA id 8ADFE4E204D; Fri, 25 Jan 2019 02:55:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=akkea.ca; s=mail; t=1548384937; bh=+JXGIVucnYCY0cluddvyVeHVzItz/VTc2jupzPlE5mk=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=S/T368i0EE27Nh6XHcxhO1cbGHBeLDfxuHZ5N8hx6l+DAEHXkNUG6vShI91PFEH7c fY2Q6hN0bu9dtF7QyKs+brb281XIiCsHYKwnp6xT7gLLuVOupR6Bb0GjzZnF1WjIQ/ CLbrNz2JEkVOPgIILCjns859Z4HZn2A+GGi1/Tcw= From: "Angus Ainslie (Purism)" To: angus@akkea.ca Cc: angus.ainslie@puri.sm, Vinod Koul , dmaengine@vger.kernel.org, NXP Linux Team , Pengutronix Kernel Team , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Lucas Stach , Daniel Baluta Subject: [PATCH v4 1/5] dmaengine: imx-sdma: add clock ratio 1:1 check Date: Thu, 24 Jan 2019 19:55:24 -0700 Message-Id: <20190125025528.15645-2-angus@akkea.ca> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190125025528.15645-1-angus@akkea.ca> References: <20190120023150.17138-1-angus@akkea.ca> <20190125025528.15645-1-angus@akkea.ca> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On i.mx8 mscale B0 chip, AHB/SDMA clock ratio 2:1 can't be supportted, since SDMA clock ratio has to be increased to 250Mhz, AHB can't reach to 500Mhz, so use 1:1 instead. Based on NXP commit MLK-16841-1 by Robin Gong Signed-off-by: Angus Ainslie (Purism) --- drivers/dma/imx-sdma.c | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-) diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index 0b3a67ff8e82..5e5ef0b5a973 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -440,6 +440,8 @@ struct sdma_engine { unsigned int irq; dma_addr_t bd0_phys; struct sdma_buffer_descriptor *bd0; + /* clock ratio for AHB:SDMA core. 1:1 is 1, 2:1 is 0*/ + bool clk_ratio; }; static int sdma_config_write(struct dma_chan *chan, @@ -662,8 +664,14 @@ static int sdma_run_channel0(struct sdma_engine *sdma) dev_err(sdma->dev, "Timeout waiting for CH0 ready\n"); /* Set bits of CONFIG register with dynamic context switching */ - if (readl(sdma->regs + SDMA_H_CONFIG) == 0) - writel_relaxed(SDMA_H_CONFIG_CSM, sdma->regs + SDMA_H_CONFIG); + if ((readl(sdma->regs + SDMA_H_CONFIG) & ~SDMA_H_CONFIG_ACR) == 0) { + reg = SDMA_H_CONFIG_CSM; + + if (sdma->clk_ratio) + reg |= SDMA_H_CONFIG_ACR; + + writel_relaxed(reg, sdma->regs + SDMA_H_CONFIG); + } return ret; } @@ -1840,6 +1848,9 @@ static int sdma_init(struct sdma_engine *sdma) if (ret) goto disable_clk_ipg; + if (clk_get_rate(sdma->clk_ahb) == clk_get_rate(sdma->clk_ipg)) + sdma->clk_ratio = 1; + /* Be sure SDMA has not started yet */ writel_relaxed(0, sdma->regs + SDMA_H_C0PTR); @@ -1880,8 +1891,10 @@ static int sdma_init(struct sdma_engine *sdma) writel_relaxed(0x4050, sdma->regs + SDMA_CHN0ADDR); /* Set bits of CONFIG register but with static context switching */ - /* FIXME: Check whether to set ACR bit depending on clock ratios */ - writel_relaxed(0, sdma->regs + SDMA_H_CONFIG); + if (sdma->clk_ratio) + writel_relaxed(SDMA_H_CONFIG_ACR, sdma->regs + SDMA_H_CONFIG); + else + writel_relaxed(0, sdma->regs + SDMA_H_CONFIG); writel_relaxed(ccb_phys, sdma->regs + SDMA_H_C0PTR); -- 2.17.1