From patchwork Mon Dec 12 18:07:27 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sudip Mukherjee X-Patchwork-Id: 634149 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 B134CC10F1D for ; Mon, 12 Dec 2022 18:09:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233411AbiLLSJE (ORCPT ); Mon, 12 Dec 2022 13:09:04 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34296 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233290AbiLLSIT (ORCPT ); Mon, 12 Dec 2022 13:08:19 -0500 Received: from mail-wm1-x335.google.com (mail-wm1-x335.google.com [IPv6:2a00:1450:4864:20::335]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 346FB273B for ; Mon, 12 Dec 2022 10:07:51 -0800 (PST) Received: by mail-wm1-x335.google.com with SMTP id r7-20020a1c4407000000b003d1e906ca23so4745944wma.3 for ; Mon, 12 Dec 2022 10:07:51 -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=pQuE2K78uUlvCMGWFDZZHN9GOwoDWtlsbedBiWwRDfg=; b=jaHLnsIYEZXfnaU6a2ldMiE275sZuX9Wbq117I2Jw43JPyMxu5yo68Uj7Yy4ycmJYq PUU+LkMNy+SF81zAOHaS+BQhLkjgH+f+SfO+9q8ueaaMTUl1GJqJBJ3NhM8qojWlSrp7 MVoQtDGxSPWSWS30rW5bo4HsLRBgFJySBBdN/m9tNI/rX8f81dhAYmXSAh0rVY9wIwzY eil7uJupKi3DZb/is/7NEAJhn3eHqL9jQEutvZ9PBfwjzd2XQlpQTLCJmCgZlvsCwhZ1 v71KA5thTpBdW0xq+yO5YvO+xAuZR9nkEFA+djLJjQXonSxzmxygnS//vyON6nsl62Vp 298g== 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=pQuE2K78uUlvCMGWFDZZHN9GOwoDWtlsbedBiWwRDfg=; b=XBSW7093zZFeJsUWCmrCuFPDqDMsGqWahImEuMo06ON52qwUDj8CgaVziz5HJjG8yz VTMgztvq9Nv1y8EyJALtVt+vZAYwALnK0ptCZW+dPnskpb6Ik+eygsk57DBmYOTPBgrr S8ds3oJTyceGLBOSJwe1zQVZAj/xJCWz1ULNxt9pJHP3kofpB3cak08OafyVPKEp/La2 UDgjodt8AYwHe8EnSyVf8Nq6we5oFaoBRRvJB6BjOLF6PLj2GLQIZKSLznjZrpl/1moR Ic7PSWxtYnBj/QFd1ikDXItI7o9PrvMuDm1UxY71Y3y4UjlUeWt71iEuQ38WPf+VGcao +NZA== X-Gm-Message-State: ANoB5pn37UuK1Yt0mQlrg4x43yjIa7JzYGCPPHeYvb3zM2qLPRg93wdg 6cGpm09ZwvrQz36EpnZELqbwGg== X-Google-Smtp-Source: AA0mqf4YkjQSyvUPzCW5WFKTMeX06dUxr3FM0c1i93DR0EFe1wd0BuRBczuZcAm/hzFgM0p3opDFWg== X-Received: by 2002:a05:600c:1c90:b0:3d2:274d:be7c with SMTP id k16-20020a05600c1c9000b003d2274dbe7cmr3040697wms.19.1670868470682; Mon, 12 Dec 2022 10:07:50 -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.4.2022.12.12.10.07.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 12 Dec 2022 10:07:50 -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 10/15] spi: dw: Calculate Receive FIFO Threshold Level Date: Mon, 12 Dec 2022 18:07:27 +0000 Message-Id: <20221212180732.79167-11-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 In enhanced mode we need to calculate RXFTLR based on the length of data we are expecting to receive or the fifo length. Signed-off-by: Sudip Mukherjee --- drivers/spi/spi-dw-core.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/spi/spi-dw-core.c b/drivers/spi/spi-dw-core.c index 10d453228368f..75f5ce5f377ca 100644 --- a/drivers/spi/spi-dw-core.c +++ b/drivers/spi/spi-dw-core.c @@ -428,6 +428,14 @@ static void dw_spi_irq_setup(struct dw_spi *dws, */ level = min_t(u16, dws->fifo_len / 2, dws->tx_len); dw_writel(dws, DW_SPI_TXFTLR, level); + + /* + * In enhanced mode if we are reading then tx_len is 0 as we + * have nothing to transmit. Calculate DW_SPI_RXFTLR with + * rx_len. + */ + if (t_handler == dw_spi_enh_handler) + level = min_t(u16, dws->fifo_len / 2, dws->rx_len); dw_writel(dws, DW_SPI_RXFTLR, level - 1); dws->transfer_handler = t_handler;