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=-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=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 97663C47097 for ; Thu, 3 Jun 2021 07:34:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7D794613E3 for ; Thu, 3 Jun 2021 07:34:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229925AbhFCHg3 (ORCPT ); Thu, 3 Jun 2021 03:36:29 -0400 Received: from mx08-00178001.pphosted.com ([91.207.212.93]:28472 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S229567AbhFCHg2 (ORCPT ); Thu, 3 Jun 2021 03:36:28 -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 1537ROxn019474; Thu, 3 Jun 2021 09:34:31 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=foss.st.com; h=from : to : cc : subject : date : message-id : mime-version : content-type; s=selector1; bh=M8auMruCTancpOkSvfb5Dqc6xkUzb7oAmg9WAVNNKKw=; b=sE/6zk8pEdJUvam5nVDtSSp5T4mk7u6Cwgioe0iSaLimTF99/PSM0708+HCHb+y7FpT2 hM0PvzsspYHy6edpPJkOSELH9Hvjnda3M9fJKJarUeNczCXns5C4EVDu/yN0vGmNAyPm wnBCPtAW+k5ZvTsyUGNazCws18wv+8jZOwbb2birdTXk5uj4mNoVB4AjlK+jedxaUBBR lwTGYdpHMeHVJIFoHXGSyMpRWRZVeQuUROF8/WoMhe6n2nbk4pJ8L5trLefCSZwd0OcX vyUTchffh6BMjYgdj0I3IFvowL99j7+XPEJZn9I0ACDs68KjRQY4Vfn9f9ZVypoplY05 qQ== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com with ESMTP id 38x3gv33cx-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 03 Jun 2021 09:34:31 +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 CF02010002A; Thu, 3 Jun 2021 09:34:30 +0200 (CEST) Received: from Webmail-eu.st.com (sfhdag2node3.st.com [10.75.127.6]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 3FD1B2138CF; Thu, 3 Jun 2021 09:34:30 +0200 (CEST) Received: from localhost (10.75.127.48) by SFHDAG2NODE3.st.com (10.75.127.6) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 3 Jun 2021 09:34:29 +0200 From: To: Mark Brown , Alexandre Torgue CC: , , , , , Subject: spi: stm32-qspi: Always wait BUSY bit to be cleared in stm32_qspi_wait_cmd() Date: Thu, 3 Jun 2021 09:34:21 +0200 Message-ID: <20210603073421.8441-1-patrice.chotard@foss.st.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.75.127.48] X-ClientProxiedBy: SFHDAG2NODE1.st.com (10.75.127.4) To SFHDAG2NODE3.st.com (10.75.127.6) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.761 definitions=2021-06-03_04:2021-06-02,2021-06-03 signatures=0 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Patrice Chotard In U-boot side, an issue has been encountered when QSPI source clock is running at low frequency (24 MHz for example), waiting for TCF bit to be set didn't ensure that all data has been send out the FIFO, we should also wait that BUSY bit is cleared. To prevent similar issue in kernel driver, we implement similar behavior by always waiting BUSY bit to be cleared. Signed-off-by: Patrice Chotard --- drivers/spi/spi-stm32-qspi.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-stm32-qspi.c b/drivers/spi/spi-stm32-qspi.c index 7e640ccc7e77..594f64136208 100644 --- a/drivers/spi/spi-stm32-qspi.c +++ b/drivers/spi/spi-stm32-qspi.c @@ -294,7 +294,7 @@ static int stm32_qspi_wait_cmd(struct stm32_qspi *qspi, int err = 0; if (!op->data.nbytes) - return stm32_qspi_wait_nobusy(qspi); + goto wait_nobusy; if (readl_relaxed(qspi->io_base + QSPI_SR) & SR_TCF) goto out; @@ -315,6 +315,9 @@ static int stm32_qspi_wait_cmd(struct stm32_qspi *qspi, out: /* clear flags */ writel_relaxed(FCR_CTCF | FCR_CTEF, qspi->io_base + QSPI_FCR); +wait_nobusy: + if (!err) + err = stm32_qspi_wait_nobusy(qspi); return err; } -- 2.17.1