From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751885Ab3ARMOc (ORCPT ); Fri, 18 Jan 2013 07:14:32 -0500 Received: from mga14.intel.com ([143.182.124.37]:34376 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750980Ab3ARMOa (ORCPT ); Fri, 18 Jan 2013 07:14:30 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.84,491,1355126400"; d="scan'208";a="192609696" From: Andy Shevchenko To: Viresh Kumar , Vinod Koul , linux-kernel@vger.kernel.org, spear-devel Cc: Andy Shevchenko Subject: [PATCH] dw_dmac: move soft LLP code from tasklet to dwc_scan_descriptors Date: Fri, 18 Jan 2013 14:14:15 +0200 Message-Id: <1358511255-6324-1-git-send-email-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 1.7.10.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The proper place for the main logic of the soft LLP mode is dwc_scan_descriptors. It prevents to get the transfer unexpectedly aborted in case the user calls dwc_tx_status. Signed-off-by: Andy Shevchenko --- drivers/dma/dw_dmac.c | 43 +++++++++++++++++++++---------------------- 1 file changed, 21 insertions(+), 22 deletions(-) diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c index 28593b7..3935ed7 100644 --- a/drivers/dma/dw_dmac.c +++ b/drivers/dma/dw_dmac.c @@ -400,6 +400,20 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc) if (status_xfer & dwc->mask) { /* Everything we've submitted is done */ dma_writel(dw, CLEAR.XFER, dwc->mask); + + if (test_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags)) { + if (dwc->tx_node_active != dwc->tx_list) { + desc = to_dw_desc(dwc->tx_node_active); + + /* Submit next block */ + dwc_do_single_block(dwc, desc); + spin_unlock_irqrestore(&dwc->lock, flags); + + return; + } + /* We are done here */ + clear_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags); + } spin_unlock_irqrestore(&dwc->lock, flags); dwc_complete_all(dw, dwc); @@ -411,6 +425,12 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc) return; } + if (test_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags)) { + dev_vdbg(chan2dev(&dwc->chan), "%s: soft LLP mode\n", __func__); + spin_unlock_irqrestore(&dwc->lock, flags); + return; + } + dev_vdbg(chan2dev(&dwc->chan), "%s: llp=0x%llx\n", __func__, (unsigned long long)llp); @@ -596,29 +616,8 @@ static void dw_dma_tasklet(unsigned long data) dwc_handle_cyclic(dw, dwc, status_err, status_xfer); else if (status_err & (1 << i)) dwc_handle_error(dw, dwc); - else if (status_xfer & (1 << i)) { - unsigned long flags; - - spin_lock_irqsave(&dwc->lock, flags); - if (test_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags)) { - if (dwc->tx_node_active != dwc->tx_list) { - struct dw_desc *desc = - to_dw_desc(dwc->tx_node_active); - - dma_writel(dw, CLEAR.XFER, dwc->mask); - - dwc_do_single_block(dwc, desc); - - spin_unlock_irqrestore(&dwc->lock, flags); - continue; - } - /* we are done here */ - clear_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags); - } - spin_unlock_irqrestore(&dwc->lock, flags); - + else if (status_xfer & (1 << i)) dwc_scan_descriptors(dw, dwc); - } } /* -- 1.7.10.4