From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS, UNWANTED_LANGUAGE_BODY,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 11465C43387 for ; Fri, 18 Jan 2019 03:33:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D714A20855 for ; Fri, 18 Jan 2019 03:33:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727091AbfARDdN (ORCPT ); Thu, 17 Jan 2019 22:33:13 -0500 Received: from mail.windriver.com ([147.11.1.11]:45024 "EHLO mail.windriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726858AbfARDdM (ORCPT ); Thu, 17 Jan 2019 22:33:12 -0500 Received: from ALA-HCA.corp.ad.wrs.com ([147.11.189.40]) by mail.windriver.com (8.15.2/8.15.1) with ESMTPS id x0I3X2ne007638 (version=TLSv1 cipher=AES128-SHA bits=128 verify=FAIL); Thu, 17 Jan 2019 19:33:02 -0800 (PST) Received: from pek-jsun4-d1.corp.ad.wrs.com (128.224.155.96) by ALA-HCA.corp.ad.wrs.com (147.11.189.50) with Microsoft SMTP Server id 14.3.408.0; Thu, 17 Jan 2019 19:33:02 -0800 From: Jiwei Sun To: , CC: , , Subject: [PATCH]spi: pl022: add a message state STATE_TIMEOUT for timeout transfer Date: Fri, 18 Jan 2019 11:32:29 +0800 Message-ID: <20190118033229.22553-1-jiwei.sun@windriver.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When transfer timeout, give -EAGAIN to the message's status, and it can make the spi device driver choose repeated transimation or not. And if transfer timeout, output some useful information for tracing the issue. Signed-off-by: Jiwei Sun --- drivers/spi/spi-pl022.c | 30 +++++++++++++++++++++++++++++- 1 file changed, 29 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c index 0c793e31d60f..26684178786f 100644 --- a/drivers/spi/spi-pl022.c +++ b/drivers/spi/spi-pl022.c @@ -253,6 +253,7 @@ #define STATE_RUNNING ((void *) 1) #define STATE_DONE ((void *) 2) #define STATE_ERROR ((void *) -1) +#define STATE_TIMEOUT ((void *) -2) /* * SSP State - Whether Enabled or Disabled @@ -1484,6 +1485,30 @@ static void do_interrupt_dma_transfer(struct pl022 *pl022) writew(irqflags, SSP_IMSC(pl022->virtbase)); } +static void print_current_status(struct pl022 *pl022) +{ + u32 read_cr0; + u16 read_cr1, read_dmacr, read_sr; + + if (pl022->vendor->extended_cr) + read_cr0 = readl(SSP_CR0(pl022->virtbase)); + else + read_cr0 = readw(SSP_CR0(pl022->virtbase)); + read_cr1 = readw(SSP_CR1(pl022->virtbase)); + read_dmacr = readw(SSP_DMACR(pl022->virtbase)); + read_sr = readw(SSP_SR(pl022->virtbase)); + + dev_warn(&pl022->adev->dev, "spi-pl022 CR0: %x\n", read_cr0); + dev_warn(&pl022->adev->dev, "spi-pl022 CR1: %x\n", read_cr1); + dev_warn(&pl022->adev->dev, "spi-pl022 DMACR: %x\n", read_dmacr); + dev_warn(&pl022->adev->dev, "spi-pl022 SR: %x\n", read_sr); + dev_warn(&pl022->adev->dev, + "spi-pl022 exp_fifo_level/fifodepth: %u/%d\n", + pl022->exp_fifo_level, + pl022->vendor->fifodepth); + +} + static void do_polling_transfer(struct pl022 *pl022) { struct spi_message *message = NULL; @@ -1535,7 +1560,8 @@ static void do_polling_transfer(struct pl022 *pl022) if (time_after(time, timeout)) { dev_warn(&pl022->adev->dev, "%s: timeout!\n", __func__); - message->state = STATE_ERROR; + message->state = STATE_TIMEOUT; + print_current_status(pl022); goto out; } cpu_relax(); @@ -1553,6 +1579,8 @@ static void do_polling_transfer(struct pl022 *pl022) /* Handle end of message */ if (message->state == STATE_DONE) message->status = 0; + else if (message->state == STATE_TIMEOUT) + message->status = -EAGAIN; else message->status = -EIO; -- 2.20.1