From patchwork Tue Sep 1 09:58:44 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shawn Lin X-Patchwork-Id: 7104391 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 1FBE89F36E for ; Tue, 1 Sep 2015 10:02:12 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 3538C20570 for ; Tue, 1 Sep 2015 10:02:11 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 3DFCF20567 for ; Tue, 1 Sep 2015 10:02:10 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZWiMh-00084z-CJ; Tue, 01 Sep 2015 10:00:31 +0000 Received: from lucky1.263xmail.com ([211.157.147.130]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZWiMd-0007OJ-KM; Tue, 01 Sep 2015 10:00:28 +0000 Received: from shawn.lin?rock-chips.com (unknown [192.168.167.110]) by lucky1.263xmail.com (Postfix) with SMTP id 969691E4A22; Tue, 1 Sep 2015 18:00:03 +0800 (CST) X-263anti-spam: KSV:0; X-MAIL-GRAY: 1 X-MAIL-DELIVERY: 0 X-KSVirus-check: 0 X-ABS-CHECKED: 4 X-ADDR-CHECKED: 0 Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.263.net (Postfix) with ESMTP id 59AEB2D3D1; Tue, 1 Sep 2015 17:59:57 +0800 (CST) X-RL-SENDER: shawn.lin@rock-chips.com X-FST-TO: vinod.koul@intel.com X-SENDER-IP: 58.22.7.114 X-LOGIN-NAME: shawn.lin@rock-chips.com X-UNIQUE-TAG: X-ATTACHMENT-NUM: 0 X-SENDER: lintao@rock-chips.com X-DNS-TYPE: 0 Received: from localhost.localdomain (unknown [58.22.7.114]) by smtp.263.net (Postfix) whith ESMTP id 115726WRR5P; Tue, 01 Sep 2015 17:59:59 +0800 (CST) From: Shawn Lin To: Vinod Koul , Heiko Stuebner , Jaroslav Kysela , Takashi Iwai , Mark Brown Subject: [PATCH v3 8/9] spi: rockchip: modify DMA max burst to 1 Date: Tue, 1 Sep 2015 17:58:44 +0800 Message-Id: <1441101524-1700-1-git-send-email-shawn.lin@rock-chips.com> X-Mailer: git-send-email 1.8.0 In-Reply-To: <1441101381-1329-1-git-send-email-shawn.lin@rock-chips.com> References: <1441101381-1329-1-git-send-email-shawn.lin@rock-chips.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150901_030027_992785_A5547569 X-CRM114-Status: UNSURE ( 8.27 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -1.9 (-) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Addy Ke , alsa-devel@alsa-project.org, Olof Johansson , Shawn Lin , Olof Johansson , Doug Anderson , linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org, dmaengine@vger.kernel.org, linux-spi@vger.kernel.org, Sonny Rao , linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Addy Ke Generic dma controller on Rockchips' platform cannot support DMAFLUSHP instruction which make dma to flush the req of non-aligned or non-multiple of what we need. That will cause an unrecoverable dma bus error. The saftest way is to set dma max burst to 1. Signed-off-by: Addy ke Fixes: 64e36824b32b06 ("spi/rockchip: add driver for Rockchip...") Signed-off-by: Shawn Lin cc: Heiko Stuebner cc: Olof Johansson cc: Doug Anderson cc: Sonny Rao --- Changes in v3: None Changes in v2: None Changes in v1: None drivers/spi/spi-rockchip.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c index 68e7efe..3748ca5 100644 --- a/drivers/spi/spi-rockchip.c +++ b/drivers/spi/spi-rockchip.c @@ -199,6 +199,8 @@ struct rockchip_spi { struct sg_table rx_sg; struct rockchip_spi_dma_data dma_rx; struct rockchip_spi_dma_data dma_tx; + int quirk; +#define ROCKCHIP_SPI_BORKEN_BURST_LEN (1<<0) /* broken burst len*/ }; static inline void spi_enable_chip(struct rockchip_spi *rs, int enable) @@ -449,7 +451,10 @@ static void rockchip_spi_prepare_dma(struct rockchip_spi *rs) rxconf.direction = rs->dma_rx.direction; rxconf.src_addr = rs->dma_rx.addr; rxconf.src_addr_width = rs->n_bytes; - rxconf.src_maxburst = rs->n_bytes; + if (rs->quirk & ROCKCHIP_SPI_BORKEN_BURST_LEN) + rxconf.src_maxburst = 1; + else + rxconf.src_maxburst = rs->n_bytes; dmaengine_slave_config(rs->dma_rx.ch, &rxconf); rxdesc = dmaengine_prep_slave_sg( @@ -466,7 +471,10 @@ static void rockchip_spi_prepare_dma(struct rockchip_spi *rs) txconf.direction = rs->dma_tx.direction; txconf.dst_addr = rs->dma_tx.addr; txconf.dst_addr_width = rs->n_bytes; - txconf.dst_maxburst = rs->n_bytes; + if (rs->quirk & ROCKCHIP_SPI_BORKEN_BURST_LEN) + txconf.dst_maxburst = 1; + else + txconf.dst_maxburst = rs->n_bytes; dmaengine_slave_config(rs->dma_tx.ch, &txconf); txdesc = dmaengine_prep_slave_sg( @@ -699,6 +707,10 @@ static int rockchip_spi_probe(struct platform_device *pdev) goto err_get_fifo_len; } + if (of_property_read_bool(pdev->dev.of_node, + "rockchip,spi-broken-burst-len")) + rs->quirk |= ROCKCHIP_SPI_BORKEN_BURST_LEN; + spin_lock_init(&rs->lock); pm_runtime_set_active(&pdev->dev);