From patchwork Mon Dec 12 18:07:19 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sudip Mukherjee X-Patchwork-Id: 633478 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 01612C10F31 for ; Mon, 12 Dec 2022 18:08:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233058AbiLLSIl (ORCPT ); Mon, 12 Dec 2022 13:08:41 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34156 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233060AbiLLSIL (ORCPT ); Mon, 12 Dec 2022 13:08:11 -0500 Received: from mail-wm1-x331.google.com (mail-wm1-x331.google.com [IPv6:2a00:1450:4864:20::331]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2D97F5F7A for ; Mon, 12 Dec 2022 10:07:44 -0800 (PST) Received: by mail-wm1-x331.google.com with SMTP id ay40so6225507wmb.2 for ; Mon, 12 Dec 2022 10:07:44 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sifive.com; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=QJpkfVk+rL7x2b/nU0sS6OBZ4oN2z+03SLnndpdgjrU=; b=coay2wl1/s4NDUzaAH2FelFujb/pQqhfoq0CyZRpTKnSSwiKcrzDD+0bA4jNeymiZq G6f/dJWF/DY2krfbefg0qOwxesLZjGG9xa095p/CHtnx54LwSN/fhQvceSupQdQjrTDu n9E3MRzbuQI1d3G16erMlXsPmD/wqVgbaDynUY2jXO9sWteacVm0Jm0htSHkQqurCeEL lbZiNQLFjqXhS98gCH2lw+ifkT5cVUP6awQdApA5uARg4sBrrqBSR03Fq6a2eRVB2vkg X3tUGPhyuNH5knqXkzt3HFg3bzQJ8dgYnSZu5Hp8LcAu7q9DqCXjL5fSNOF1q99kpYSi CuXw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=QJpkfVk+rL7x2b/nU0sS6OBZ4oN2z+03SLnndpdgjrU=; b=JjbfadHeO1fk4D9n1iDRHnASQ5NhXDF2EnMNhNGlQNQDdR1eW9QlMvItBR7VMgCVp2 WfXDlYXY1Wkp1rUCXk2mmr3E5VKj1KPEJsSoGwqnX1CgaC2bV1EfT2ZljxZ/PK6P8it4 BMsCRpUdyQaJ3HZry4iin0TryWXsMAte88uvrzejO6hNBzvjX+uSmWZ1EeAtnKx852B9 vd5P/X27WLAa46+a9o/911kwE3INbdTpOtgTYiM8YH5rEZHU7W5kBoT7N8vI7d51/i1a CU7vXQWDv4REf0lp7Bp/qPNkQO7rLyl9GUTqDidWLbt3is1p+rB4F2zLM9tCic1Xlgoo pACA== X-Gm-Message-State: ANoB5pkqSziccGS38JyKaUXxI8gbxsoARXbVrODXVW2yi59UoIVyMvlm 6NlMFmQok5I+xwhkJhw9R5RtKw== X-Google-Smtp-Source: AA0mqf5cAskf49A0ST3HZiQkCFRj43GVuLuMuTT6xeW8YU6CvinMbu6M9kKaMkfbKpgF9qujMnRkLw== X-Received: by 2002:a7b:c5c4:0:b0:3d1:f234:12cc with SMTP id n4-20020a7bc5c4000000b003d1f23412ccmr12919514wmk.33.1670868463449; Mon, 12 Dec 2022 10:07:43 -0800 (PST) Received: from localhost.localdomain (host-78-150-37-98.as13285.net. [78.150.37.98]) by smtp.gmail.com with ESMTPSA id t123-20020a1c4681000000b003a3170a7af9sm10156808wma.4.2022.12.12.10.07.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 12 Dec 2022 10:07:43 -0800 (PST) From: Sudip Mukherjee To: Serge Semin , Mark Brown , Rob Herring , Krzysztof Kozlowski Cc: jude.onyenegecha@sifive.com, ben.dooks@sifive.com, jeegar.lakhani@sifive.com, linux-spi@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Sudip Mukherjee Subject: [PATCH v2 02/15] spi: dw: update NDF while using enhanced spi mode Date: Mon, 12 Dec 2022 18:07:19 +0000 Message-Id: <20221212180732.79167-3-sudip.mukherjee@sifive.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20221212180732.79167-1-sudip.mukherjee@sifive.com> References: <20221212180732.79167-1-sudip.mukherjee@sifive.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org If the transfer of Transmit only mode is using dual/quad/octal SPI then NDF needs to be updated with the number of data frames. If the Transmit FIFO goes empty in-between, DWC_ssi masks the serial clock and wait for rest of the data until the programmed amount of frames are transferred successfully. Signed-off-by: Sudip Mukherjee --- drivers/spi/spi-dw-core.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-dw-core.c b/drivers/spi/spi-dw-core.c index 77c23772bb3d9..8c47a4d14b666 100644 --- a/drivers/spi/spi-dw-core.c +++ b/drivers/spi/spi-dw-core.c @@ -346,7 +346,9 @@ void dw_spi_update_config(struct dw_spi *dws, struct spi_device *spi, dw_writel(dws, DW_SPI_CTRLR0, cr0); if (cfg->tmode == DW_SPI_CTRLR0_TMOD_EPROMREAD || - cfg->tmode == DW_SPI_CTRLR0_TMOD_RO) + cfg->tmode == DW_SPI_CTRLR0_TMOD_RO || + (cfg->tmode == DW_SPI_CTRLR0_TMOD_TO && + cfg->spi_frf != DW_SPI_CTRLR0_SPI_FRF_STD_SPI)) dw_writel(dws, DW_SPI_CTRLR1, cfg->ndf ? cfg->ndf - 1 : 0); /* Note DW APB SSI clock divider doesn't support odd numbers */