From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964989AbbDIJhH (ORCPT ); Thu, 9 Apr 2015 05:37:07 -0400 Received: from devils.ext.ti.com ([198.47.26.153]:38791 "EHLO devils.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964970AbbDIJg6 (ORCPT ); Thu, 9 Apr 2015 05:36:58 -0400 From: Peter Ujfalusi To: , , CC: , , , , , , , , , Subject: [PATCH v5 6/8] dmaengine: omap-dma: Remove mapping between virtual channels and requests Date: Thu, 9 Apr 2015 12:35:52 +0300 Message-ID: <1428572154-3548-7-git-send-email-peter.ujfalusi@ti.com> X-Mailer: git-send-email 2.3.5 In-Reply-To: <1428572154-3548-1-git-send-email-peter.ujfalusi@ti.com> References: <1428572154-3548-1-git-send-email-peter.ujfalusi@ti.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Do not direct map the virtual channels to sDMA request number. When the sDMA is behind of a crossbar this direct mapping can cause situations when certain channel can not be requested since the crossbar request number will no longer match with the sDMA request line. The direct mapping for virtual channels with HW request lines will make it harder to implement MEM_TO_MEM mode for the driver. Signed-off-by: Peter Ujfalusi --- drivers/dma/omap-dma.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c index 211c9c1edf08..b19b9ee8f1d1 100644 --- a/drivers/dma/omap-dma.c +++ b/drivers/dma/omap-dma.c @@ -593,6 +593,7 @@ static void omap_dma_free_chan_resources(struct dma_chan *chan) omap_free_dma(c->dma_ch); dev_dbg(od->ddev.dev, "freeing channel for %u\n", c->dma_sig); + c->dma_sig = 0; } static size_t omap_dma_sg_size(struct omap_sg *sg) @@ -1041,7 +1042,7 @@ static int omap_dma_resume(struct dma_chan *chan) return 0; } -static int omap_dma_chan_init(struct omap_dmadev *od, int dma_sig) +static int omap_dma_chan_init(struct omap_dmadev *od) { struct omap_chan *c; @@ -1050,7 +1051,6 @@ static int omap_dma_chan_init(struct omap_dmadev *od, int dma_sig) return -ENOMEM; c->reg_map = od->reg_map; - c->dma_sig = dma_sig; c->vc.desc_free = omap_dma_desc_free; vchan_init(&c->vc, &od->ddev); INIT_LIST_HEAD(&c->node); @@ -1130,7 +1130,7 @@ static int omap_dma_probe(struct platform_device *pdev) } for (i = 0; i < od->dma_requests; i++) { - rc = omap_dma_chan_init(od, i); + rc = omap_dma_chan_init(od); if (rc) { omap_dma_free(od); return rc; @@ -1221,10 +1221,14 @@ static struct platform_driver omap_dma_driver = { bool omap_dma_filter_fn(struct dma_chan *chan, void *param) { if (chan->device->dev->driver == &omap_dma_driver.driver) { + struct omap_dmadev *od = to_omap_dma_dev(chan->device); struct omap_chan *c = to_omap_dma_chan(chan); unsigned req = *(unsigned *)param; - return req == c->dma_sig; + if (req <= od->dma_requests) { + c->dma_sig = req; + return true; + } } return false; } -- 2.3.5