From patchwork Thu Aug 20 09:20:33 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 265588 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=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, 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 1A683C433E1 for ; Thu, 20 Aug 2020 11:08:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E83AF2072D for ; Thu, 20 Aug 2020 11:08:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597921734; bh=XJ5DmlNOlYa9O5RhsrLNP3SNVFa/vv5QstJP+KMrTms=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Z6XhSsptwC6yZshRY7UN0A25JhunbsbbKXzaHCONxpuKC4r83fRF0bfehE8SNonOe ESmlJD1PZzhsy8M+LSKrOsN7blUmjBeHSCLuU1m9ttrIPpQ6nJ/PphK9yCDh0KtNZF RlqSYC1Nn7FgjWout5Sa74awpZMOexIe+8C0Vlzo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726772AbgHTLIy (ORCPT ); Thu, 20 Aug 2020 07:08:54 -0400 Received: from mail.kernel.org ([198.145.29.99]:45652 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730648AbgHTKKE (ORCPT ); Thu, 20 Aug 2020 06:10:04 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 243BC2067C; Thu, 20 Aug 2020 10:10:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597918203; bh=XJ5DmlNOlYa9O5RhsrLNP3SNVFa/vv5QstJP+KMrTms=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=b36zhDYbvBr+965GA0WamGSxJ9k8ma6qRuWsZ2CcVcRNUot2Db6iC5zjrua0l/OXb bqnV6Rq+FQWQcewZhugZ3r4ZKM/UrcMs+JJOyPJGO/5dj7U0JvsKYv1q2YZsaFc/9A khzvkpUyrL2bQ4bOuO/bejkaCoMGf4x9mBcgVwPo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dilip Kota , Mark Brown , Sasha Levin Subject: [PATCH 4.14 058/228] spi: lantiq: fix: Rx overflow error in full duplex mode Date: Thu, 20 Aug 2020 11:20:33 +0200 Message-Id: <20200820091610.506196666@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200820091607.532711107@linuxfoundation.org> References: <20200820091607.532711107@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Dilip Kota [ Upstream commit 661ccf2b3f1360be50242726f7c26ced6a9e7d52 ] In full duplex mode, rx overflow error is observed. To overcome the error, wait until the complete data got received and proceed further. Fixes: 17f84b793c01 ("spi: lantiq-ssc: add support for Lantiq SSC SPI controller") Signed-off-by: Dilip Kota Link: https://lore.kernel.org/r/efb650b0faa49a00788c4e0ca8ef7196bdba851d.1594957019.git.eswara.kota@linux.intel.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/spi/spi-lantiq-ssc.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/spi/spi-lantiq-ssc.c b/drivers/spi/spi-lantiq-ssc.c index d5976615d924b..dc740b5f720ba 100644 --- a/drivers/spi/spi-lantiq-ssc.c +++ b/drivers/spi/spi-lantiq-ssc.c @@ -187,6 +187,7 @@ struct lantiq_ssc_spi { unsigned int tx_fifo_size; unsigned int rx_fifo_size; unsigned int base_cs; + unsigned int fdx_tx_level; }; static u32 lantiq_ssc_readl(const struct lantiq_ssc_spi *spi, u32 reg) @@ -484,6 +485,7 @@ static void tx_fifo_write(struct lantiq_ssc_spi *spi) u32 data; unsigned int tx_free = tx_fifo_free(spi); + spi->fdx_tx_level = 0; while (spi->tx_todo && tx_free) { switch (spi->bits_per_word) { case 2 ... 8: @@ -512,6 +514,7 @@ static void tx_fifo_write(struct lantiq_ssc_spi *spi) lantiq_ssc_writel(spi, data, LTQ_SPI_TB); tx_free--; + spi->fdx_tx_level++; } } @@ -523,6 +526,13 @@ static void rx_fifo_read_full_duplex(struct lantiq_ssc_spi *spi) u32 data; unsigned int rx_fill = rx_fifo_level(spi); + /* + * Wait until all expected data to be shifted in. + * Otherwise, rx overrun may occur. + */ + while (rx_fill != spi->fdx_tx_level) + rx_fill = rx_fifo_level(spi); + while (rx_fill) { data = lantiq_ssc_readl(spi, LTQ_SPI_RB);