From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751394Ab2IFFA4 (ORCPT ); Thu, 6 Sep 2012 01:00:56 -0400 Received: from ch1ehsobe005.messaging.microsoft.com ([216.32.181.185]:27756 "EHLO ch1outboundpool.messaging.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750883Ab2IFFAy (ORCPT ); Thu, 6 Sep 2012 01:00:54 -0400 X-Forefront-Antispam-Report: CIP:70.37.183.190;KIP:(null);UIP:(null);IPV:NLI;H:mail.freescale.net;RD:none;EFVD:NLI X-SpamScore: 0 X-BigFish: VS0(zzzz1202hzz8275bhz2dh2a8h668h839he5bhf0ah107ah1155h) From: Shaohui Xie To: , CC: , , , Shaohui Xie , Anju Bhartiya Subject: [PATCH] [v2] sata_fsl: add workaround for data length mismatch on freescale V2 controller Date: Thu, 6 Sep 2012 12:28:06 +0800 Message-ID: <1346905686-27912-1-git-send-email-Shaohui.Xie@freescale.com> X-Mailer: git-send-email 1.6.4 MIME-Version: 1.0 Content-Type: text/plain X-OriginatorOrg: freescale.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The freescale V2 SATA controller checks if the received data length matches the programmed length 'ttl', if not, it assumes that this is an error. In ATAPI, the 'ttl' is based on max allocation length and not the actual data transfer length, controller will raise 'DLM' (Data length Mismatch) error bit in Hstatus register. Along with 'DLM', DE (Device error) and FE (fatal Error) bits are also set in Hstatus register, 'E' (Internal Error) bit is set in Serror register and CE (Command Error) and DE (Device error) registers have the corresponding bit set. In this condition, we need to clear errors in following way: in the service routine, based on 'DLM' flag, HCONTROL[27] operation clears Hstatus, CE and DE registers, clear Serror register. Signed-off-by: Shaohui Xie Signed-off-by: Anju Bhartiya --- changes for V2: 1. remove the using of quirk; 2. wrap errata codes in condition; drivers/ata/sata_fsl.c | 40 +++++++++++++++++++++++++++++++++++----- 1 files changed, 35 insertions(+), 5 deletions(-) diff --git a/drivers/ata/sata_fsl.c b/drivers/ata/sata_fsl.c index d6577b9..6b7b73e 100644 --- a/drivers/ata/sata_fsl.c +++ b/drivers/ata/sata_fsl.c @@ -143,6 +143,7 @@ enum { FATAL_ERR_CRC_ERR_RX | FATAL_ERR_FIFO_OVRFL_TX | FATAL_ERR_FIFO_OVRFL_RX, + INT_ON_DATA_LENGTH_MISMATCH = (1 << 12), INT_ON_FATAL_ERR = (1 << 5), INT_ON_PHYRDY_CHG = (1 << 4), @@ -1180,26 +1181,55 @@ static void sata_fsl_host_intr(struct ata_port *ap) void __iomem *hcr_base = host_priv->hcr_base; u32 hstatus, done_mask = 0; struct ata_queued_cmd *qc; - u32 SError; + u32 SError, tag; + u32 status_mask = INT_ON_ERROR; hstatus = ioread32(hcr_base + HSTATUS); sata_fsl_scr_read(&ap->link, SCR_ERROR, &SError); + /* Read command completed register */ + done_mask = ioread32(hcr_base + CC); + + /* Workaround for data length mismatch errata */ + if (unlikely(hstatus & INT_ON_DATA_LENGTH_MISMATCH)) { + for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { + qc = ata_qc_from_tag(ap, tag); + if (qc && ata_is_atapi(qc->tf.protocol)) { + u32 Hcontrol; +#define HCONTROL_CLEAR_ERROR (1 << 27) + /* Set HControl[27] to clear error registers */ + Hcontrol = ioread32(hcr_base + HCONTROL); + iowrite32(Hcontrol | HCONTROL_CLEAR_ERROR, + hcr_base + HCONTROL); + + /* Clear HControl[27] */ + iowrite32(Hcontrol & (~HCONTROL_CLEAR_ERROR), + hcr_base + HCONTROL); + + /* Clear SError[E] bit */ + sata_fsl_scr_write(&ap->link, SCR_ERROR, + SError); + + /* Ignore fatal error and device error */ + status_mask &= ~(INT_ON_SINGL_DEVICE_ERR + | INT_ON_FATAL_ERR); + break; + } + } + } + if (unlikely(SError & 0xFFFF0000)) { DPRINTK("serror @host_intr : 0x%x\n", SError); sata_fsl_error_intr(ap); } - if (unlikely(hstatus & INT_ON_ERROR)) { + if (unlikely(hstatus & status_mask)) { DPRINTK("error interrupt!!\n"); sata_fsl_error_intr(ap); return; } - /* Read command completed register */ - done_mask = ioread32(hcr_base + CC); - VPRINTK("Status of all queues :\n"); VPRINTK("done_mask/CC = 0x%x, CA = 0x%x, CE=0x%x,CQ=0x%x,apqa=0x%x\n", done_mask, -- 1.6.4