From patchwork Fri Nov 17 20:13:04 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Lechner X-Patchwork-Id: 13459252 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 469B9C072A2 for ; Fri, 17 Nov 2023 20:14:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235726AbjKQUOY (ORCPT ); Fri, 17 Nov 2023 15:14:24 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54192 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235704AbjKQUOV (ORCPT ); Fri, 17 Nov 2023 15:14:21 -0500 Received: from mail-oi1-x229.google.com (mail-oi1-x229.google.com [IPv6:2607:f8b0:4864:20::229]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1B4FC173F for ; Fri, 17 Nov 2023 12:14:03 -0800 (PST) Received: by mail-oi1-x229.google.com with SMTP id 5614622812f47-3b2ea7cc821so1443667b6e.1 for ; Fri, 17 Nov 2023 12:14:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20230601.gappssmtp.com; s=20230601; t=1700252042; x=1700856842; darn=vger.kernel.org; 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=6P+/RJb/cpUDSZO9aZmvZcYWX64h3DCpi271jxLHolk=; b=mJuBTJQyYIMZXnaCfua6kd7F4fee5sTKKD/NSeXd0DEH8JMEXpWpvWeYM+UxSvPdhL igr9ZTk3aWYW4EKOr4jJmq74uKxBn/zMM8srLf/HJz3ldK9b2vekNqWIZJgMt+3LbZh7 DkFozzyjukJtnZ0lw9w+YW1yas8rIYPyhPlHRujUhO4Y/o0k5GGMC260bA1fLKq6I+iD dXG9qfwYI5ov35igQhrlHcO7GoiKNV0otvgNcaasvQr7hk26GpRfztiet6KrD1Xm9M7s /emAhjdEVL2TWm0gLBpDsWQwpu3bO7B9kpYAkkIAMbb8cEkPX+Jc2XwiYRqqH5gULECB 2A7w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1700252042; x=1700856842; 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=6P+/RJb/cpUDSZO9aZmvZcYWX64h3DCpi271jxLHolk=; b=A0GGuOYZSJ7EmH2iYNowDsfflwhYY9fMn96mZVjNpyYz9OjN6Fz9nEXT6EXstbPhSO qKtikyRfJyye2ZpudLVH1tFm2CCZTA5+QuEiL0ooxyv8t9zCKEUtU3fX7qSuOP4s0kkj Wv+FimGoxHp5F2jcCjiCyF7hHh9Vv8N7ws1C1gZHQywSfDJEHPpCe9foT4+FUAD+4G3N Y3sGoo3hkumTaPgaImERNIC2qVhDdBMa+kBc9rG1cC1wzkMYTh6o/zNuQOUq5r8pQuHf COXu2gqcRRHLtxHjzLr9oAPu3yYAF9Gzo9SajeufvSy78vtr4B/a/DcRcJ+OIcez0bRk wi5g== X-Gm-Message-State: AOJu0YwTQhNdG1zEaw42fOHVQJRd+9T73TWNEk4z3J+KH6IG1uTby/xF 4OAXxQxzHkRZLPWN36bg6J3b4le9g7r9Xuze4LL+YQ== X-Google-Smtp-Source: AGHT+IFEitzBPfYZPR5lABqTFEOeHF0t8EqCeQ2/c/+BO/rZ9LzA3npUgrEGfGJe2sKopIY/JWdDoQ== X-Received: by 2002:a05:6808:f07:b0:3b2:d8c8:7bfa with SMTP id m7-20020a0568080f0700b003b2d8c87bfamr555396oiw.8.1700252042081; Fri, 17 Nov 2023 12:14:02 -0800 (PST) Received: from freyr.lechnology.com (ip98-183-112-25.ok.ok.cox.net. [98.183.112.25]) by smtp.gmail.com with ESMTPSA id l21-20020a544515000000b003a8560a9d34sm393814oil.25.2023.11.17.12.14.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 17 Nov 2023 12:14:01 -0800 (PST) From: David Lechner To: linux-spi@vger.kernel.org, devicetree@vger.kernel.org Cc: David Lechner , Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Michael Hennerich , =?utf-8?q?Nuno_S=C3=A1?= , Lars-Peter Clausen , linux-kernel@vger.kernel.org Subject: [PATCH 13/14] spi: axi-spi-engine: add support for cs_off Date: Fri, 17 Nov 2023 14:13:04 -0600 Message-ID: <20231117-axi-spi-engine-series-1-v1-13-cc59db999b87@baylibre.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231117-axi-spi-engine-series-1-v1-0-cc59db999b87@baylibre.com> References: <20231117-axi-spi-engine-series-1-v1-0-cc59db999b87@baylibre.com> MIME-Version: 1.0 X-Mailer: b4 0.12.4 Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org This adds support for the spi_transfer::cs_off flag to the AXI SPI Engine driver. The logic is copied from the generic spi_transfer_one_message() in spi.c. Signed-off-by: David Lechner --- drivers/spi/spi-axi-spi-engine.c | 31 +++++++++++++++++++++---------- 1 file changed, 21 insertions(+), 10 deletions(-) diff --git a/drivers/spi/spi-axi-spi-engine.c b/drivers/spi/spi-axi-spi-engine.c index c39f478f34a7..1c60e6486ee2 100644 --- a/drivers/spi/spi-axi-spi-engine.c +++ b/drivers/spi/spi-axi-spi-engine.c @@ -216,7 +216,7 @@ static int spi_engine_compile_message(struct spi_engine *spi_engine, struct spi_device *spi = msg->spi; struct spi_transfer *xfer; int clk_div, new_clk_div; - bool cs_change = true; + bool keep_cs = false; clk_div = -1; @@ -224,6 +224,9 @@ static int spi_engine_compile_message(struct spi_engine *spi_engine, SPI_ENGINE_CMD_WRITE(SPI_ENGINE_CMD_REG_CONFIG, spi_engine_get_config(spi))); + xfer = list_first_entry(&msg->transfers, struct spi_transfer, transfer_list); + spi_engine_gen_cs(p, dry, spi, !xfer->cs_off); + list_for_each_entry(xfer, &msg->transfers, transfer_list) { new_clk_div = spi_engine_get_clk_div(spi_engine, spi, xfer); if (new_clk_div != clk_div) { @@ -233,20 +236,28 @@ static int spi_engine_compile_message(struct spi_engine *spi_engine, clk_div)); } - if (cs_change) - spi_engine_gen_cs(p, dry, spi, true); - spi_engine_gen_xfer(p, dry, xfer); spi_engine_gen_sleep(p, dry, spi_engine, clk_div, xfer); - cs_change = xfer->cs_change; - if (list_is_last(&xfer->transfer_list, &msg->transfers)) - cs_change = !cs_change; - - if (cs_change) - spi_engine_gen_cs(p, dry, spi, false); + if (xfer->cs_change) { + if (list_is_last(&xfer->transfer_list, &msg->transfers)) { + keep_cs = true; + } else { + if (!xfer->cs_off) + spi_engine_gen_cs(p, dry, spi, false); + + if (!list_next_entry(xfer, transfer_list)->cs_off) + spi_engine_gen_cs(p, dry, spi, true); + } + } else if (!list_is_last(&xfer->transfer_list, &msg->transfers) && + xfer->cs_off != list_next_entry(xfer, transfer_list)->cs_off) { + spi_engine_gen_cs(p, dry, spi, xfer->cs_off); + } } + if (!keep_cs) + spi_engine_gen_cs(p, dry, spi, false); + return 0; }