From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757197Ab0KOOUV (ORCPT ); Mon, 15 Nov 2010 09:20:21 -0500 Received: from mail-out.m-online.net ([212.18.0.9]:52300 "EHLO mail-out.m-online.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756862Ab0KOOUT (ORCPT ); Mon, 15 Nov 2010 09:20:19 -0500 X-Auth-Info: QW+Jg3CBsmKPfeHRRompl20ujpFaSLUqGmLeunr0w+I= Message-ID: <4CE141EA.5070702@grandegger.com> Date: Mon, 15 Nov 2010 15:21:30 +0100 From: Wolfgang Grandegger User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.12) Gecko/20100907 Fedora/3.0.7-1.fc12 Thunderbird/3.0.7 MIME-Version: 1.0 To: Tomoya MORINAGA CC: "David S. Miller" , Wolfram Sang , Christian Pellegrin , Barry Song <21cnbao@gmail.com>, Samuel Ortiz , socketcan-core@lists.berlios.de, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, andrew.chih.howe.khor@intel.com, qi.wang@intel.com, margie.foster@intel.com, yong.y.wang@intel.com, Masayuki Ohtake , kok.howg.ewe@intel.com, joel.clark@intel.com Subject: Re: [PATCH net-next-2.6 v2] can: Topcliff: PCH_CAN driver: Add Flow control, References: <4CE0EFA7.9020007@dsn.okisemi.com> In-Reply-To: <4CE0EFA7.9020007@dsn.okisemi.com> X-Enigmail-Version: 1.0.1 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, On 11/15/2010 09:30 AM, Tomoya MORINAGA wrote: > * Add Flow control > * Fix Data copy issue (endianness) > * Add Macro prefix "PCH_" > * Separate interface register structure > * Some functions are unified. > * Change MessageObject indication(PCH_RX_OBJ_START, etc..) > * Enumerate LEC macro > * Move MSI processing from open/close to probe/remove processing > * Use BIT(x) > * and more... > > Signed-off-by: Tomoya MORINAGA > --- > drivers/net/can/pch_can.c | 1348 ++++++++++++++++++++------------------------- > 1 files changed, 595 insertions(+), 753 deletions(-) > > diff --git a/drivers/net/can/pch_can.c b/drivers/net/can/pch_can.c > index 6727182..6a38593 100644 > --- a/drivers/net/can/pch_can.c > +++ b/drivers/net/can/pch_can.c ... > - if (status & PCH_LEC_ALL) { > + lec = status & PCH_LEC_ALL; > + switch (lec) { > + case PCH_STUF_ERR: > + cf->data[2] |= CAN_ERR_PROT_STUFF; > priv->can.can_stats.bus_error++; > stats->rx_errors++; > - switch (status & PCH_LEC_ALL) { > - case PCH_STUF_ERR: > - cf->data[2] |= CAN_ERR_PROT_STUFF; > - break; > - case PCH_FORM_ERR: > - cf->data[2] |= CAN_ERR_PROT_FORM; > - break; > - case PCH_ACK_ERR: > - cf->data[2] |= CAN_ERR_PROT_LOC_ACK | > - CAN_ERR_PROT_LOC_ACK_DEL; > - break; > - case PCH_BIT1_ERR: > - case PCH_BIT0_ERR: > - cf->data[2] |= CAN_ERR_PROT_BIT; > - break; > - case PCH_CRC_ERR: > - cf->data[2] |= CAN_ERR_PROT_LOC_CRC_SEQ | > - CAN_ERR_PROT_LOC_CRC_DEL; > - break; > - default: > - iowrite32(status | PCH_LEC_ALL, &priv->regs->stat); > - break; > - } > - > + break; > + case PCH_FORM_ERR: > + cf->data[2] |= CAN_ERR_PROT_FORM; > + priv->can.can_stats.bus_error++; > + stats->rx_errors++; > + break; > + case PCH_ACK_ERR: > + cf->can_id |= CAN_ERR_ACK; > + priv->can.can_stats.bus_error++; > + stats->rx_errors++; > + break; > + case PCH_BIT1_ERR: > + case PCH_BIT0_ERR: > + cf->data[2] |= CAN_ERR_PROT_BIT; > + priv->can.can_stats.bus_error++; > + stats->rx_errors++; > + break; > + case PCH_CRC_ERR: > + cf->data[2] |= CAN_ERR_PROT_LOC_CRC_SEQ | > + CAN_ERR_PROT_LOC_CRC_DEL; > + priv->can.can_stats.bus_error++; > + stats->rx_errors++; > + break; > + case PCH_LEC_ALL: /* Written by CPU. No error status */ > + break; > } More comments to the lec handling below. > + cf->data[6] = ioread32(&priv->regs->errc) & PCH_TEC; > + cf->data[7] = (ioread32(&priv->regs->errc) & PCH_REC) >> 8; Could be handle with just *one* register access. ... > static int pch_can_rx_poll(struct napi_struct *napi, int quota) > { > struct net_device *ndev = napi->dev; > struct pch_can_priv *priv = netdev_priv(ndev); > - struct net_device_stats *stats = &(priv->ndev->stats); > - u32 dlc; > u32 int_stat; > int rcv_pkts = 0; > u32 reg_stat; > - unsigned long flags; > > int_stat = pch_can_int_pending(priv); > if (!int_stat) > - return 0; > + goto end; > > -INT_STAT: > - if (int_stat == CAN_STATUS_INT) { > + if ((int_stat == PCH_STATUS_INT) && (quota > 0)) { > reg_stat = ioread32(&priv->regs->stat); > if (reg_stat & (PCH_BUS_OFF | PCH_LEC_ALL)) { > - if ((reg_stat & PCH_LEC_ALL) != PCH_LEC_ALL) > + if ((reg_stat & PCH_LEC_ALL) != PCH_LEC_ALL) { > pch_can_error(ndev, reg_stat); > + quota--; > + } Should be: if (reg_stat & PCH_BUS_OFF || (reg_stat & PCH_LEC_ALL) != PCH_LEC_ALL) { Your lec handling is still not correc, I believe. The driver needs to write PCH_LEC_ALL to the "stat" register once in the initialization code and then after each error observed (lec != PCH_LEC_ALL). I still do not find such code. Could you show us the output of "# candump any,0:0,#FFFFFFFF" when yo send CAN messages *without* a cable connected?. Thanks, Wolfgang.