From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-3444635-1521482970-2-9296356051853581437 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.25, ME_NOAUTH 0.01, RCVD_IN_DNSWL_HI -5, T_RP_MATCHES_RCVD -0.01, LANGUAGES en, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='CN', FromHeader='org', MailFrom='org' X-Spam-charsets: plain='UTF-8' X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: stable-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=arctest; t=1521482970; b=pS4x0lEzpzOabLesLmm1nvlB0bB+nggJSnPr2WPzeX8qQ7f 5NGP2gwzM4mLIr3Z1CaMGE9AVAflTgKaiRHeRVTAN6KqvELRyyFP4m8ghUICgBt5 u/088sGalkBKDQIEOOY7I25tibMUiGIjUD6IULbPuS4OnpPw1qzJc68P8KZ6zbCK Eo4x+3YYvteO2oRxyxLbTzZrQuenPbZQB0qZ/GBx94t9iYYqhMXIJUvtnCKOOjFk TSlsCtH/Ws0h91xgjblJWnYxNR2G01rVQTPfqhsMBhke7blnL0wfJle7XpMr67xn WyecVdMUNdOwODHULjjxG3CakBLpizXJCsEgJzA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=from:to:cc:subject:date:message-id :in-reply-to:references:mime-version:content-type:sender :list-id; s=arctest; t=1521482970; bh=n3dJ9KzaIMcoI3QR3p5i8WLsxM PzlBE6kt2Juz4vtAw=; b=SQWIOUu9V1Y/uNcOLBH+h0Q1CkqV+8lnrYl82ISz8Y GHm7VRottyh4VdmvSO9cNvmuTzvfCxZPXkpTKxCH8PsY3B9Aa34ryJoi2scvJqm1 fIq8kZjZ+w72F4UflvHv1baZMLeQ5SBlqEE9CQO0AJ/nnpokmUA6NP88m/lE/6yO a6t51buBrOdixtXEOYFfkwDnPPNWZWh+KRHqSuJWEQMP1PCVffcNVlWyNOYmyuXv UvdEEhirCgY38VWXyAmrs4V7ggAQPqBWpyLTW67DHAhDGUO1WXWvazszn3engPgH /w8JGwdfBYzrsW4hRILaOajBns2EmXQld2sUv+hDMZaw== ARC-Authentication-Results: i=1; mx4.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=linuxfoundation.org; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-category=clean score=-100 state=0 spamcause=gggruggvucftvghtrhhoucdtuddrgedtgedrudefgddutdelucdltddurdegtdefrddttddmucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlnecuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefhvffufffkofgjfhgfgggtshhpjeesthdtfedtreerjeenucfhrhhomhepifhrvghgucfmrhhorghhqdfjrghrthhmrghnuceoghhrvghgkhhhsehlihhnuhigfhhouhhnuggrthhiohhnrdhorhhgqeenucfkphepvddtledrudefvddrudektddrieejpdeltddrledvrdeiuddrvddtvdenucfrrghrrghmpehinhgvthepvddtledrudefvddrudektddrieejpdhhvghlohepvhhgvghrrdhkvghrnhgvlhdrohhrghdpmhgrihhlfhhrohhmpeeoshhtrggslhgvqdhofihnvghrsehvghgvrhdrkhgvrhhnvghlrdhorhhgqecuuefqffgjpeekuefkvffokffogfcuuffkkgfgpeefieeivdenucevlhhushhtvghrufhiiigvpeeg; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=linuxfoundation.org header.result=pass header_is_org_domain=yes Authentication-Results: mx4.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=linuxfoundation.org; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-category=clean score=-100 state=0 spamcause=gggruggvucftvghtrhhoucdtuddrgedtgedrudefgddutdelucdltddurdegtdefrddttddmucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlnecuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefhvffufffkofgjfhgfgggtshhpjeesthdtfedtreerjeenucfhrhhomhepifhrvghgucfmrhhorghhqdfjrghrthhmrghnuceoghhrvghgkhhhsehlihhnuhigfhhouhhnuggrthhiohhnrdhorhhgqeenucfkphepvddtledrudefvddrudektddrieejpdeltddrledvrdeiuddrvddtvdenucfrrghrrghmpehinhgvthepvddtledrudefvddrudektddrieejpdhhvghlohepvhhgvghrrdhkvghrnhgvlhdrohhrghdpmhgrihhlfhhrohhmpeeoshhtrggslhgvqdhofihnvghrsehvghgvrhdrkhgvrhhnvghlrdhorhhgqecuuefqffgjpeekuefkvffokffogfcuuffkkgfgpeefieeivdenucevlhhushhtvghrufhiiigvpeeg; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=linuxfoundation.org header.result=pass header_is_org_domain=yes Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S968641AbeCSSJ0 (ORCPT ); Mon, 19 Mar 2018 14:09:26 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:41402 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S968634AbeCSSJY (ORCPT ); Mon, 19 Mar 2018 14:09:24 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mark Brown , Akinobu Mita , Sasha Levin Subject: [PATCH 3.18 18/68] spi: omap2-mcspi: poll OMAP2_MCSPI_CHSTAT_RXS for PIO transfer Date: Mon, 19 Mar 2018 19:05:56 +0100 Message-Id: <20180319171830.418323122@linuxfoundation.org> X-Mailer: git-send-email 2.16.2 In-Reply-To: <20180319171827.899658615@linuxfoundation.org> References: <20180319171827.899658615@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 3.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Akinobu Mita [ Upstream commit 812613591cb652344186c4cd912304ed02138566 ] When running the spi-loopback-test with slower clock rate like 10 KHz, the test for 251 bytes transfer was failed. This failure triggered an spi-omap2-mcspi's error message "DMA RX last word empty". This message means that PIO for reading the remaining bytes due to the DMA transfer length reduction is failed. This problem can be fixed by polling OMAP2_MCSPI_CHSTAT_RXS bit in channel status register to wait until the receive buffer register is filled. Cc: Mark Brown Signed-off-by: Akinobu Mita Signed-off-by: Mark Brown Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/spi/spi-omap2-mcspi.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) --- a/drivers/spi/spi-omap2-mcspi.c +++ b/drivers/spi/spi-omap2-mcspi.c @@ -441,6 +441,8 @@ omap2_mcspi_rx_dma(struct spi_device *sp int elements = 0; int word_len, element_count; struct omap2_mcspi_cs *cs = spi->controller_state; + void __iomem *chstat_reg = cs->base + OMAP2_MCSPI_CHSTAT0; + mcspi = spi_master_get_devdata(spi->master); mcspi_dma = &mcspi->dma_channels[spi->chip_select]; count = xfer->len; @@ -501,8 +503,8 @@ omap2_mcspi_rx_dma(struct spi_device *sp if (l & OMAP2_MCSPI_CHCONF_TURBO) { elements--; - if (likely(mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHSTAT0) - & OMAP2_MCSPI_CHSTAT_RXS)) { + if (!mcspi_wait_for_reg_bit(chstat_reg, + OMAP2_MCSPI_CHSTAT_RXS)) { u32 w; w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0); @@ -520,8 +522,7 @@ omap2_mcspi_rx_dma(struct spi_device *sp return count; } } - if (likely(mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHSTAT0) - & OMAP2_MCSPI_CHSTAT_RXS)) { + if (!mcspi_wait_for_reg_bit(chstat_reg, OMAP2_MCSPI_CHSTAT_RXS)) { u32 w; w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0);