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=-19.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 BE438C4320E for ; Tue, 27 Jul 2021 13:30:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 98EBD61A7F for ; Tue, 27 Jul 2021 13:30:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236774AbhG0N35 (ORCPT ); Tue, 27 Jul 2021 09:29:57 -0400 Received: from mail.kernel.org ([198.145.29.99]:57238 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236945AbhG0NU3 (ORCPT ); Tue, 27 Jul 2021 09:20:29 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 5F53F61AF0; Tue, 27 Jul 2021 13:20:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1627392005; bh=ZrM7mpef1J97AF2lCJYTrQjbSs1wkpfGPP0dtCY0iiA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=C28G0BfjRuBrQLNqvShvZPl28TlgjhMaUvvimZwAUxdyEuxSAbw9izZIJC0j+WZkD fJ81EmGBKL7jmBnImf5H/+VTYH1TOyLVu+XgONinmXXoHQdXqQZBPKpHKdAr2vnKjO 1ClSWTZsmslyPWQZjA4OqgXvn3Ly7tsH0S3cuNarjoPj36P1M6+naJnG3yU51WOGhJ oz/zgee8Ryg6sH8Xiu+gigzvt7hnBsonHLetiBcYUD/GEbvMNZeefXPXLnnEzaT+iG ANeJynTnI5DZTQ2KL52YaCQOlgDLNJlMrBkVNSo/h+ONg6iSmTIOsBlIXXesOA5FgD 5WOdViSgGQKCQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Alain Volmat , Amelie Delaunay , Mark Brown , Sasha Levin , linux-spi@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org Subject: [PATCH AUTOSEL 5.4 2/9] spi: stm32h7: fix full duplex irq handler handling Date: Tue, 27 Jul 2021 09:19:54 -0400 Message-Id: <20210727132002.835130-2-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210727132002.835130-1-sashal@kernel.org> References: <20210727132002.835130-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org From: Alain Volmat [ Upstream commit e4a5c19888a5f8a9390860ca493e643be58c8791 ] In case of Full-Duplex mode, DXP flag is set when RXP and TXP flags are set. But to avoid 2 different handlings, just add TXP and RXP flag in the mask instead of DXP, and then keep the initial handling of TXP and RXP events. Also rephrase comment about EOTIE which is one of the interrupt enable bits. It is not triggered by any event. Signed-off-by: Amelie Delaunay Signed-off-by: Alain Volmat Reviewed-by: Amelie Delaunay Link: https://lore.kernel.org/r/1625042723-661-3-git-send-email-alain.volmat@foss.st.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/spi/spi-stm32.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c index 3af6a5a3a4b2..92bf667951b0 100644 --- a/drivers/spi/spi-stm32.c +++ b/drivers/spi/spi-stm32.c @@ -913,15 +913,18 @@ static irqreturn_t stm32h7_spi_irq_thread(int irq, void *dev_id) ier = readl_relaxed(spi->base + STM32H7_SPI_IER); mask = ier; - /* EOTIE is triggered on EOT, SUSP and TXC events. */ + /* + * EOTIE enables irq from EOT, SUSP and TXC events. We need to set + * SUSP to acknowledge it later. TXC is automatically cleared + */ + mask |= STM32H7_SPI_SR_SUSP; /* - * When TXTF is set, DXPIE and TXPIE are cleared. So in case of - * Full-Duplex, need to poll RXP event to know if there are remaining - * data, before disabling SPI. + * DXPIE is set in Full-Duplex, one IT will be raised if TXP and RXP + * are set. So in case of Full-Duplex, need to poll TXP and RXP event. */ - if (spi->rx_buf && !spi->cur_usedma) - mask |= STM32H7_SPI_SR_RXP; + if ((spi->cur_comm == SPI_FULL_DUPLEX) && !spi->cur_usedma) + mask |= STM32H7_SPI_SR_TXP | STM32H7_SPI_SR_RXP; if (!(sr & mask)) { dev_warn(spi->dev, "spurious IT (sr=0x%08x, ier=0x%08x)\n", -- 2.30.2