From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753773Ab1IFISP (ORCPT ); Tue, 6 Sep 2011 04:18:15 -0400 Received: from sm-d311v.smileserver.ne.jp ([203.211.202.206]:38811 "EHLO sm-d311v.smileserver.ne.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753286Ab1IFISH (ORCPT ); Tue, 6 Sep 2011 04:18:07 -0400 From: Tomoya MORINAGA To: Grant Likely , spi-devel-general@lists.sourceforge.net, linux-kernel@vger.kernel.org Cc: qi.wang@intel.com, yong.y.wang@intel.com, joel.clark@intel.com, kok.howg.ewe@intel.com, toshiharu-linux@dsn.okisemi.com, Tomoya MORINAGA Subject: [PATCH 2/5 v2] spi-topcliff-pch: Fix SSN Control issue Date: Tue, 6 Sep 2011 17:16:35 +0900 Message-Id: <1315296998-7296-2-git-send-email-tomoya-linux@dsn.okisemi.com> X-Mailer: git-send-email 1.7.4.4 In-Reply-To: <1315296998-7296-1-git-send-email-tomoya-linux@dsn.okisemi.com> References: <1315296998-7296-1-git-send-email-tomoya-linux@dsn.okisemi.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org During processing 1 command/data series, SSN should keep LOW. However, currently, SSN becomes HIGH. This patch fixes the issue. Signed-off-by: Tomoya MORINAGA --- v2: v1 patch series are included invalid patch file --- drivers/spi/spi-topcliff-pch.c | 10 +++------- 1 files changed, 3 insertions(+), 7 deletions(-) diff --git a/drivers/spi/spi-topcliff-pch.c b/drivers/spi/spi-topcliff-pch.c index 7a98caa..c36d516 100644 --- a/drivers/spi/spi-topcliff-pch.c +++ b/drivers/spi/spi-topcliff-pch.c @@ -58,6 +58,7 @@ #define PCH_SLEEP_TIME 10 #define SSN_LOW 0x02U +#define SSN_HIGH 0x03U #define SSN_NO_CONTROL 0x00U #define PCH_MAX_CS 0xFF #define PCI_DEVICE_ID_GE_SPI 0x8816 @@ -756,10 +757,6 @@ static void pch_spi_set_ir(struct pch_spi_data *data) wait_event_interruptible(data->wait, data->transfer_complete); - pch_spi_writereg(data->master, PCH_SSNXCR, SSN_NO_CONTROL); - dev_dbg(&data->master->dev, - "%s:no more control over SSN-writing 0 to SSNXCR.", __func__); - /* clear all interrupts */ pch_spi_writereg(data->master, PCH_SPSR, pch_spi_readreg(data->master, PCH_SPSR)); @@ -848,9 +845,6 @@ static void pch_spi_start_transfer(struct pch_spi_data *data) kfree(dma->sg_rx_p); spin_lock_irqsave(&data->lock, flags); - pch_spi_writereg(data->master, PCH_SSNXCR, SSN_NO_CONTROL); - dev_dbg(&data->master->dev, - "%s:no more control over SSN-writing 0 to SSNXCR.", __func__); /* clear fifo threshold, disable interrupts, disable SPI transfer */ pch_spi_setclr_reg(data->master, PCH_SPCR, 0, @@ -1167,6 +1161,7 @@ static void pch_spi_process_messages(struct work_struct *pwork) if (data->use_dma) pch_spi_request_dma(data, data->current_msg->spi->bits_per_word); + pch_spi_writereg(data->master, PCH_SSNXCR, SSN_NO_CONTROL); do { /* If we are already processing a message get the next transfer structure from the message otherwise retrieve @@ -1227,6 +1222,7 @@ static void pch_spi_process_messages(struct work_struct *pwork) } while (data->cur_trans != NULL); + pch_spi_writereg(data->master, PCH_SSNXCR, SSN_HIGH); if (data->use_dma) pch_spi_release_dma(data); } -- 1.7.4.4