From patchwork Wed Jul 7 08:27:04 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alain Volmat X-Patchwork-Id: 12362057 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 EB055C07E9C for ; Wed, 7 Jul 2021 08:27:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D637461CB0 for ; Wed, 7 Jul 2021 08:27:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231136AbhGGIai (ORCPT ); Wed, 7 Jul 2021 04:30:38 -0400 Received: from mx08-00178001.pphosted.com ([91.207.212.93]:29700 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S230492AbhGGIaf (ORCPT ); Wed, 7 Jul 2021 04:30:35 -0400 Received: from pps.filterd (m0046660.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 1678MhXF003169; Wed, 7 Jul 2021 10:27:43 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=foss.st.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=selector1; bh=JFihWyCt2PJ0euphUNgFoY2OzTe2RhTz2i7OqbL8v4o=; b=xi7MGojenQVRco8mrt0iGc3OEnNu1Z9IfqRHRkOHwGpoJC31kcRLIeCwwxSOZcEeeXrC YMi+UlHWBBzXC6ZwYMindiKak/5S7qMe6q22TnzGZHE2wNBmEz8/0RupDXPympNlXd45 /ByBDFgjxDT06xj49NWyi6jKxGkTi1Tfr97647aMMAOCbq0UBRoYaqO0majvqoWwQpm6 zVMSGuV3Kk9yLTgn5ShmrKcYuD93FtVg6mWNhqak+d4l/nSWpM7DsEwvmaPVARDuj69i ZwxUIHSUQ5soRqLtHIFDQlOWlZmzl4yHqsPU6Ta/idZUa2RdFlVy6Ugc+kVgdS1zZQvm Cw== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com with ESMTP id 39mxgxjrb4-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 07 Jul 2021 10:27:43 +0200 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id E764210002A; Wed, 7 Jul 2021 10:27:42 +0200 (CEST) Received: from Webmail-eu.st.com (sfhdag2node3.st.com [10.75.127.6]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id DB9E5215125; Wed, 7 Jul 2021 10:27:42 +0200 (CEST) Received: from localhost (10.75.127.49) by SFHDAG2NODE3.st.com (10.75.127.6) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 7 Jul 2021 10:27:42 +0200 From: Alain Volmat To: , CC: , , , , , , , Subject: [PATCH v2 5/7] spi: stm32h7: rework rx fifo read function Date: Wed, 7 Jul 2021 10:27:04 +0200 Message-ID: <1625646426-5826-6-git-send-email-alain.volmat@foss.st.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1625646426-5826-1-git-send-email-alain.volmat@foss.st.com> References: <1625646426-5826-1-git-send-email-alain.volmat@foss.st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.49] X-ClientProxiedBy: SFHDAG2NODE3.st.com (10.75.127.6) To SFHDAG2NODE3.st.com (10.75.127.6) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.790 definitions=2021-07-07_05:2021-07-06,2021-07-07 signatures=0 Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org From: Amelie Delaunay Remove flush parameter and check RXWNE or RXPLVL when end of transfer flag is set. Signed-off-by: Amelie Delaunay Signed-off-by: Alain Volmat --- drivers/spi/spi-stm32.c | 30 +++++++++++++----------------- 1 file changed, 13 insertions(+), 17 deletions(-) diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c index d37bfead4d8c..c2144e3c57eb 100644 --- a/drivers/spi/spi-stm32.c +++ b/drivers/spi/spi-stm32.c @@ -570,29 +570,30 @@ static void stm32f4_spi_read_rx(struct stm32_spi *spi) /** * stm32h7_spi_read_rxfifo - Read bytes in Receive Data Register * @spi: pointer to the spi controller data structure - * @flush: boolean indicating that FIFO should be flushed * * Write in rx_buf depends on remaining bytes to avoid to write beyond * rx_buf end. */ -static void stm32h7_spi_read_rxfifo(struct stm32_spi *spi, bool flush) +static void stm32h7_spi_read_rxfifo(struct stm32_spi *spi) { u32 sr = readl_relaxed(spi->base + STM32H7_SPI_SR); u32 rxplvl = FIELD_GET(STM32H7_SPI_SR_RXPLVL, sr); while ((spi->rx_len > 0) && ((sr & STM32H7_SPI_SR_RXP) || - (flush && ((sr & STM32H7_SPI_SR_RXWNE) || (rxplvl > 0))))) { + ((sr & STM32H7_SPI_SR_EOT) && + ((sr & STM32H7_SPI_SR_RXWNE) || (rxplvl > 0))))) { u32 offs = spi->cur_xferlen - spi->rx_len; if ((spi->rx_len >= sizeof(u32)) || - (flush && (sr & STM32H7_SPI_SR_RXWNE))) { + (sr & STM32H7_SPI_SR_RXWNE)) { u32 *rx_buf32 = (u32 *)(spi->rx_buf + offs); *rx_buf32 = readl_relaxed(spi->base + STM32H7_SPI_RXDR); spi->rx_len -= sizeof(u32); } else if ((spi->rx_len >= sizeof(u16)) || - (flush && (rxplvl >= 2 || spi->cur_bpw > 8))) { + (!(sr & STM32H7_SPI_SR_RXWNE) && + (rxplvl >= 2 || spi->cur_bpw > 8))) { u16 *rx_buf16 = (u16 *)(spi->rx_buf + offs); *rx_buf16 = readw_relaxed(spi->base + STM32H7_SPI_RXDR); @@ -608,8 +609,8 @@ static void stm32h7_spi_read_rxfifo(struct stm32_spi *spi, bool flush) rxplvl = FIELD_GET(STM32H7_SPI_SR_RXPLVL, sr); } - dev_dbg(spi->dev, "%s%s: %d bytes left\n", __func__, - flush ? "(flush)" : "", spi->rx_len); + dev_dbg(spi->dev, "%s: %d bytes left (sr=%08x)\n", + __func__, spi->rx_len, sr); } /** @@ -677,12 +678,7 @@ static void stm32f4_spi_disable(struct stm32_spi *spi) * @spi: pointer to the spi controller data structure * * RX-Fifo is flushed when SPI controller is disabled. To prevent any data - * loss, use stm32h7_spi_read_rxfifo(flush) to read the remaining bytes in - * RX-Fifo. - * Normally, if TSIZE has been configured, we should relax the hardware at the - * reception of the EOT interrupt. But in case of error, EOT will not be - * raised. So the subsystem unprepare_message call allows us to properly - * complete the transfer from an hardware point of view. + * loss, use stm32_spi_read_rxfifo to read the remaining bytes in RX-Fifo. */ static void stm32h7_spi_disable(struct stm32_spi *spi) { @@ -717,7 +713,7 @@ static void stm32h7_spi_disable(struct stm32_spi *spi) } if (!spi->cur_usedma && spi->rx_buf && (spi->rx_len > 0)) - stm32h7_spi_read_rxfifo(spi, true); + stm32h7_spi_read_rxfifo(spi); if (spi->cur_usedma && spi->dma_tx) dmaengine_terminate_all(spi->dma_tx); @@ -913,7 +909,7 @@ static irqreturn_t stm32h7_spi_irq_thread(int irq, void *dev_id) if (__ratelimit(&rs)) dev_dbg_ratelimited(spi->dev, "Communication suspended\n"); if (!spi->cur_usedma && (spi->rx_buf && (spi->rx_len > 0))) - stm32h7_spi_read_rxfifo(spi, false); + stm32h7_spi_read_rxfifo(spi); /* * If communication is suspended while using DMA, it means * that something went wrong, so stop the current transfer @@ -934,7 +930,7 @@ static irqreturn_t stm32h7_spi_irq_thread(int irq, void *dev_id) if (sr & STM32H7_SPI_SR_EOT) { if (!spi->cur_usedma && (spi->rx_buf && (spi->rx_len > 0))) - stm32h7_spi_read_rxfifo(spi, true); + stm32h7_spi_read_rxfifo(spi); end = true; } @@ -944,7 +940,7 @@ static irqreturn_t stm32h7_spi_irq_thread(int irq, void *dev_id) if (sr & STM32H7_SPI_SR_RXP) if (!spi->cur_usedma && (spi->rx_buf && (spi->rx_len > 0))) - stm32h7_spi_read_rxfifo(spi, false); + stm32h7_spi_read_rxfifo(spi); writel_relaxed(sr & mask, spi->base + STM32H7_SPI_IFCR);