From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756242Ab3CEKDq (ORCPT ); Tue, 5 Mar 2013 05:03:46 -0500 Received: from mga14.intel.com ([143.182.124.37]:42706 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755882Ab3CEKDo (ORCPT ); Tue, 5 Mar 2013 05:03:44 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.84,786,1355126400"; d="scan'208";a="264510453" From: Mika Westerberg To: linux-kernel@vger.kernel.org Cc: Eric Miao , Russell King , Haojian Zhuang , Grant Likely , Mark Brown , Mika Westerberg Subject: [PATCH 2/2] spi/pxa2xx: enable multiblock DMA transfers for LPSS devices Date: Tue, 5 Mar 2013 12:05:17 +0200 Message-Id: <1362477917-24904-2-git-send-email-mika.westerberg@linux.intel.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1362477917-24904-1-git-send-email-mika.westerberg@linux.intel.com> References: <1362477917-24904-1-git-send-email-mika.westerberg@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Intel LPSS SPI controllers need to have bit 0 (disable_ssp_dma_finish) set in SSP_REG in order to properly perform DMA transfers spanning over multiple blocks. Signed-off-by: Mika Westerberg --- drivers/spi/spi-pxa2xx.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c index 90b27a3..c6d5b97 100644 --- a/drivers/spi/spi-pxa2xx.c +++ b/drivers/spi/spi-pxa2xx.c @@ -68,6 +68,7 @@ MODULE_ALIAS("platform:pxa2xx-spi"); #define LPSS_TX_HITHRESH_DFLT 224 /* Offset from drv_data->lpss_base */ +#define SSP_REG 0x0c #define SPI_CS_CONTROL 0x18 #define SPI_CS_CONTROL_SW_MODE BIT(0) #define SPI_CS_CONTROL_CS_HIGH BIT(1) @@ -138,6 +139,10 @@ detection_done: /* Enable software chip select control */ value = SPI_CS_CONTROL_SW_MODE | SPI_CS_CONTROL_CS_HIGH; __lpss_ssp_write_priv(drv_data, SPI_CS_CONTROL, value); + + /* Enable multiblock DMA transfers */ + if (drv_data->master_info->enable_dma) + __lpss_ssp_write_priv(drv_data, SSP_REG, 1); } static void lpss_ssp_cs_control(struct driver_data *drv_data, bool enable) -- 1.7.10.4