From patchwork Wed Nov 17 10:44:10 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sekhar Nori X-Patchwork-Id: 332201 Received: from lists.sourceforge.net (lists.sourceforge.net [216.34.181.88]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id oAHB3l07017149 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Wed, 17 Nov 2010 11:04:07 GMT Received: from localhost ([127.0.0.1] helo=sfs-ml-4.v29.ch3.sourceforge.com) by sfs-ml-4.v29.ch3.sourceforge.com with esmtp (Exim 4.69) (envelope-from ) id 1PIfnm-0002J8-TA; Wed, 17 Nov 2010 11:03:46 +0000 Received: from sog-mx-3.v43.ch3.sourceforge.com ([172.29.43.193] helo=mx.sourceforge.net) by sfs-ml-4.v29.ch3.sourceforge.com with esmtp (Exim 4.69) (envelope-from ) id 1PIfnl-0002J3-7y for spi-devel-general@lists.sourceforge.net; Wed, 17 Nov 2010 11:03:45 +0000 Received-SPF: pass (sog-mx-3.v43.ch3.sourceforge.com: domain of india.ti.com designates 192.94.94.40 as permitted sender) client-ip=192.94.94.40; envelope-from=a0875516@india.ti.com; helo=arroyo.ext.ti.com; Received: from arroyo.ext.ti.com ([192.94.94.40]) by sog-mx-3.v43.ch3.sourceforge.com with esmtps (TLSv1:AES256-SHA:256) (Exim 4.69) id 1PIfnk-0001uE-BW; Wed, 17 Nov 2010 11:03:45 +0000 Received: from dbdp31.itg.ti.com ([172.24.170.98]) by arroyo.ext.ti.com (8.13.7/8.13.7) with ESMTP id oAHAiZeJ031555 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Wed, 17 Nov 2010 04:44:37 -0600 Received: from psplinux051.india.ti.com (localhost [127.0.0.1]) by dbdp31.itg.ti.com (8.13.8/8.13.8) with ESMTP id oAHAiU3A021921; Wed, 17 Nov 2010 16:14:31 +0530 (IST) Received: from psplinux051.india.ti.com (localhost [127.0.0.1]) by psplinux051.india.ti.com (8.13.1/8.13.1) with ESMTP id oAHAiQoI030525; Wed, 17 Nov 2010 16:14:26 +0530 Received: (from a0875516@localhost) by psplinux051.india.ti.com (8.13.1/8.13.1/Submit) id oAHAiQXU030522; Wed, 17 Nov 2010 16:14:26 +0530 From: Sekhar Nori To: spi-devel-general@lists.sourceforge.net Subject: [PATCH 38/49] spi: davinci: fix EDMA CC errors at end of transfers Date: Wed, 17 Nov 2010 16:14:10 +0530 Message-Id: <1289990661-30126-39-git-send-email-nsekhar@ti.com> X-Mailer: git-send-email 1.6.2.4 In-Reply-To: <1289990661-30126-38-git-send-email-nsekhar@ti.com> References: <1289990661-30126-1-git-send-email-nsekhar@ti.com> <1289990661-30126-2-git-send-email-nsekhar@ti.com> <1289990661-30126-3-git-send-email-nsekhar@ti.com> <1289990661-30126-4-git-send-email-nsekhar@ti.com> <1289990661-30126-5-git-send-email-nsekhar@ti.com> <1289990661-30126-6-git-send-email-nsekhar@ti.com> <1289990661-30126-7-git-send-email-nsekhar@ti.com> <1289990661-30126-8-git-send-email-nsekhar@ti.com> <1289990661-30126-9-git-send-email-nsekhar@ti.com> <1289990661-30126-10-git-send-email-nsekhar@ti.com> <1289990661-30126-11-git-send-email-nsekhar@ti.com> <1289990661-30126-12-git-send-email-nsekhar@ti.com> <1289990661-30126-13-git-send-email-nsekhar@ti.com> <1289990661-30126-14-git-send-email-nsekhar@ti.com> <1289990661-30126-15-git-send-email-nsekhar@ti.com> <1289990661-30126-16-git-send-email-nsekhar@ti.com> <1289990661-30126-17-git-send-email-nsekhar@ti.com> <1289990661-30126-18-git-send-email-nsekhar@ti.com> <1289990661-30126-19-git-send-email-nsekhar@ti.com> <1289990661-30126-20-git-send-email-nsekhar@ti.com> <1289990661-30126-21-git-send-email-nsekhar@ti.com> <1289990661-30126-22-git-send-email-nsekhar@ti.com> <1289990661-30126-23-git-send-email-nsekhar@ti.com> <1289990661-30126-24-git-send-email-nsekhar@ti.com> <1289990661-30126-25-git-send-email-nsekhar@ti.com> <1289990661-30126-26-git-send-email-nsekhar@ti.com> <1289990661-30126-27-git-send-email-nsekhar@ti.com> <1289990661-30126-28-git-send-email-nsekhar@ti.com> <1289990661-30126-29-git-send-email-nsekhar@ti.com> <1289990661-30126-30-git-send-email-nsekhar@ti.com> <1289990661-30126-31-git-send-email-nsekhar@ti.com> <1289990661-30126-32-git-send-email-nsekhar@ti.com> <1289990661-30126-33-git-send-email-nsekhar@ti.com> <1289990661-30126-34-git-send-email-nsekhar@ti.com> <1289990661-30126-35-git-send-email-nsekhar@ti.com> <1289990661-30126-36-git-send-email-nsekhar@ti.com> <1289990661-30126-37-git-send-email-nsekhar@ti.com> <1289990661-30126-38-git-send-email-nsekhar@ti.com> X-Spam-Score: -1.4 (-) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. -1.5 SPF_CHECK_PASS SPF reports sender host as permitted sender for sender-domain -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -0.0 SPF_PASS SPF: sender matches SPF record 0.1 AWL AWL: From: address is in the auto white-list X-Headers-End: 1PIfnk-0001uE-BW Cc: davinci-linux-open-source@linux.davincidsp.com, David Brownell , Sekhar Nori X-BeenThere: spi-devel-general@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: Linux SPI core/device drivers discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: spi-devel-general-bounces@lists.sourceforge.net X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter1.kernel.org [140.211.167.41]); Wed, 17 Nov 2010 11:04:07 +0000 (UTC) diff --git a/drivers/spi/davinci_spi.c b/drivers/spi/davinci_spi.c index 6db4786..975c2a2 100644 --- a/drivers/spi/davinci_spi.c +++ b/drivers/spi/davinci_spi.c @@ -116,6 +116,7 @@ struct davinci_spi_dma { int dma_tx_channel; int dma_rx_channel; + int dummy_param_slot; enum dma_event_q eventq; struct completion dma_tx_completion; @@ -697,6 +698,8 @@ static int davinci_spi_bufs_dma(struct spi_device *spi, struct spi_transfer *t) param.src_dst_cidx = 0; param.ccnt = 1; edma_write_slot(davinci_spi_dma->dma_tx_channel, ¶m); + edma_link(davinci_spi_dma->dma_tx_channel, + davinci_spi_dma->dummy_param_slot); /* * Receive DMA setup @@ -779,19 +782,37 @@ static int davinci_spi_request_dma(struct davinci_spi_dma *davinci_spi_dma) davinci_spi_dma->eventq); if (r < 0) { pr_err("Unable to request DMA channel for SPI RX\n"); - return -EAGAIN; + r = -EAGAIN; + goto rx_dma_failed; } r = edma_alloc_channel(davinci_spi_dma->dma_tx_channel, davinci_spi_dma_tx_callback, davinci_spi_dma, davinci_spi_dma->eventq); if (r < 0) { - edma_free_channel(davinci_spi_dma->dma_rx_channel); pr_err("Unable to request DMA channel for SPI TX\n"); - return -EAGAIN; + r = -EAGAIN; + goto tx_dma_failed; } + r = edma_alloc_slot(EDMA_CTLR(davinci_spi_dma->dma_tx_channel), + EDMA_SLOT_ANY); + if (r < 0) { + pr_err("Unable to request SPI TX DMA param slot\n"); + r = -EAGAIN; + goto param_failed; + } + davinci_spi_dma->dummy_param_slot = r; + edma_link(davinci_spi_dma->dummy_param_slot, + davinci_spi_dma->dummy_param_slot); + return 0; +param_failed: + edma_free_channel(davinci_spi_dma->dma_tx_channel); +tx_dma_failed: + edma_free_channel(davinci_spi_dma->dma_rx_channel); +rx_dma_failed: + return r; } /** @@ -970,6 +991,7 @@ static int davinci_spi_probe(struct platform_device *pdev) free_dma: edma_free_channel(davinci_spi->dma_channels.dma_tx_channel); edma_free_channel(davinci_spi->dma_channels.dma_rx_channel); + edma_free_slot(davinci_spi->dma_channels.dummy_param_slot); free_clk: clk_disable(davinci_spi->clk); clk_put(davinci_spi->clk);