From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753071AbZBFHQO (ORCPT ); Fri, 6 Feb 2009 02:16:14 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756608AbZBFHL1 (ORCPT ); Fri, 6 Feb 2009 02:11:27 -0500 Received: from nwd2mail10.analog.com ([137.71.25.55]:44045 "EHLO nwd2mail10.analog.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754230AbZBFHLU (ORCPT ); Fri, 6 Feb 2009 02:11:20 -0500 X-IronPort-AV: E=Sophos;i="4.37,390,1231131600"; d="scan'208";a="82422019" From: Bryan Wu To: dbrownell@users.sourceforge.net, akpm@linux-foundation.org Cc: spi-devel-general@lists.sourceforge.net, linux-kernel@vger.kernel.org, Mike Frysinger , Bryan Wu Subject: [PATCH 14/20] Blackfin SPI Driver: tweak magic spi dma sequence to get it working on BF54x Date: Fri, 6 Feb 2009 15:13:02 +0800 Message-Id: <1233904388-5765-15-git-send-email-cooloney@kernel.org> X-Mailer: git-send-email 1.5.6.3 In-Reply-To: <1233904388-5765-1-git-send-email-cooloney@kernel.org> References: <1233904388-5765-1-git-send-email-cooloney@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mike Frysinger Without this changes, SPI DMA is not reliably under stress tests. Obiviously it's a hardware issue which is not addressed by any document. Signed-off-by: Mike Frysinger Signed-off-by: Bryan Wu --- drivers/spi/spi_bfin5xx.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c index 748e98f..d8c4be1 100644 --- a/drivers/spi/spi_bfin5xx.c +++ b/drivers/spi/spi_bfin5xx.c @@ -862,8 +862,9 @@ static void pump_transfers(unsigned long data) set_dma_start_addr(drv_data->dma_channel, dma_start_addr); set_dma_config(drv_data->dma_channel, dma_config); local_irq_save(flags); - enable_dma(drv_data->dma_channel); + SSYNC(); write_CTRL(drv_data, cr); + enable_dma(drv_data->dma_channel); dma_enable_irq(drv_data->dma_channel); local_irq_restore(flags); -- 1.5.6.3