From patchwork Mon Feb 18 08:19:20 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mugunthan V N X-Patchwork-Id: 221151 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 621312C0089 for ; Mon, 18 Feb 2013 19:19:37 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754883Ab3BRITd (ORCPT ); Mon, 18 Feb 2013 03:19:33 -0500 Received: from devils.ext.ti.com ([198.47.26.153]:54334 "EHLO devils.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752204Ab3BRITc (ORCPT ); Mon, 18 Feb 2013 03:19:32 -0500 Received: from dbdp20.itg.ti.com ([172.24.170.38]) by devils.ext.ti.com (8.13.7/8.13.7) with ESMTP id r1I8JQBW000514; Mon, 18 Feb 2013 02:19:27 -0600 Received: from DBDE70.ent.ti.com (localhost [127.0.0.1]) by dbdp20.itg.ti.com (8.13.8/8.13.8) with ESMTP id r1I8JPiF016435; Mon, 18 Feb 2013 13:49:25 +0530 (IST) Received: from dbdp32.itg.ti.com (172.24.170.251) by dbde70.ent.ti.com (172.24.170.148) with Microsoft SMTP Server id 14.1.323.3; Mon, 18 Feb 2013 13:49:24 +0530 Received: from psplinux063.india.ti.com (dbdp20.itg.ti.com [172.24.170.38]) by dbdp32.itg.ti.com (8.13.8/8.13.8) with ESMTP id r1I8JMOA002507; Mon, 18 Feb 2013 13:49:23 +0530 From: Mugunthan V N To: CC: , , , Mugunthan V N Subject: [PATCH v3 net-next 1/1] drivers: net: davinci_cpdma: acknowledge interrupt properly Date: Mon, 18 Feb 2013 13:49:20 +0530 Message-ID: <1361175560-600-1-git-send-email-mugunthanvnm@ti.com> X-Mailer: git-send-email 1.8.1 MIME-Version: 1.0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org CPDMA interrupts are not properly acknowledged which leads to interrupt storm, only cpdma interrupt 0 is acknowledged in Davinci CPDMA driver. Changed cpdma_ctlr_eoi api to acknowledge 1 and 2 interrupts which are used for rx and tx respectively. Reported-by: Pantelis Antoniou Signed-off-by: Mugunthan V N --- Changes from v2: * Changed the hardware register values from enumeration to defines drivers/net/ethernet/ti/cpsw.c | 25 ++++++++++++++++--------- drivers/net/ethernet/ti/davinci_cpdma.c | 4 ++-- drivers/net/ethernet/ti/davinci_cpdma.h | 7 ++++++- 3 files changed, 24 insertions(+), 12 deletions(-) diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c index 4ceed6e..7e93df6 100644 --- a/drivers/net/ethernet/ti/cpsw.c +++ b/drivers/net/ethernet/ti/cpsw.c @@ -510,19 +510,21 @@ static int cpsw_poll(struct napi_struct *napi, int budget) int num_tx, num_rx; num_tx = cpdma_chan_process(priv->txch, 128); - num_rx = cpdma_chan_process(priv->rxch, budget); - - if (num_rx || num_tx) - cpsw_dbg(priv, intr, "poll %d rx, %d tx pkts\n", - num_rx, num_tx); + if (num_tx) + cpdma_ctlr_eoi(priv->dma, CPDMA_EOI_TX); + num_rx = cpdma_chan_process(priv->rxch, budget); if (num_rx < budget) { napi_complete(napi); cpsw_intr_enable(priv); - cpdma_ctlr_eoi(priv->dma); + cpdma_ctlr_eoi(priv->dma, CPDMA_EOI_RX); cpsw_enable_irq(priv); } + if (num_rx || num_tx) + cpsw_dbg(priv, intr, "poll %d rx, %d tx pkts\n", + num_rx, num_tx); + return num_rx; } @@ -835,7 +837,8 @@ static int cpsw_ndo_open(struct net_device *ndev) cpdma_ctlr_start(priv->dma); cpsw_intr_enable(priv); napi_enable(&priv->napi); - cpdma_ctlr_eoi(priv->dma); + cpdma_ctlr_eoi(priv->dma, CPDMA_EOI_RX); + cpdma_ctlr_eoi(priv->dma, CPDMA_EOI_TX); if (priv->data.dual_emac) priv->slaves[priv->emac_port].open_stat = true; @@ -1075,7 +1078,9 @@ static void cpsw_ndo_tx_timeout(struct net_device *ndev) cpdma_chan_start(priv->txch); cpdma_ctlr_int_ctrl(priv->dma, true); cpsw_intr_enable(priv); - cpdma_ctlr_eoi(priv->dma); + cpdma_ctlr_eoi(priv->dma, CPDMA_EOI_RX); + cpdma_ctlr_eoi(priv->dma, CPDMA_EOI_TX); + } static struct net_device_stats *cpsw_ndo_get_stats(struct net_device *ndev) @@ -1094,7 +1099,9 @@ static void cpsw_ndo_poll_controller(struct net_device *ndev) cpsw_interrupt(ndev->irq, priv); cpdma_ctlr_int_ctrl(priv->dma, true); cpsw_intr_enable(priv); - cpdma_ctlr_eoi(priv->dma); + cpdma_ctlr_eoi(priv->dma, CPDMA_EOI_RX); + cpdma_ctlr_eoi(priv->dma, CPDMA_EOI_TX); + } #endif diff --git a/drivers/net/ethernet/ti/davinci_cpdma.c b/drivers/net/ethernet/ti/davinci_cpdma.c index 7d3bffd..68c3418 100644 --- a/drivers/net/ethernet/ti/davinci_cpdma.c +++ b/drivers/net/ethernet/ti/davinci_cpdma.c @@ -493,9 +493,9 @@ int cpdma_ctlr_int_ctrl(struct cpdma_ctlr *ctlr, bool enable) return 0; } -void cpdma_ctlr_eoi(struct cpdma_ctlr *ctlr) +void cpdma_ctlr_eoi(struct cpdma_ctlr *ctlr, u32 value) { - dma_reg_write(ctlr, CPDMA_MACEOIVECTOR, 0); + dma_reg_write(ctlr, CPDMA_MACEOIVECTOR, value); } struct cpdma_chan *cpdma_chan_create(struct cpdma_ctlr *ctlr, int chan_num, diff --git a/drivers/net/ethernet/ti/davinci_cpdma.h b/drivers/net/ethernet/ti/davinci_cpdma.h index a97d6ab..d9bcc60 100644 --- a/drivers/net/ethernet/ti/davinci_cpdma.h +++ b/drivers/net/ethernet/ti/davinci_cpdma.h @@ -26,6 +26,11 @@ #define CPDMA_RX_SOURCE_PORT(__status__) ((__status__ >> 16) & 0x7) +#define CPDMA_EOI_RX_THRESH 0x0 +#define CPDMA_EOI_RX 0x1 +#define CPDMA_EOI_TX 0x2 +#define CPDMA_EOI_MISC 0x3 + struct cpdma_params { struct device *dev; void __iomem *dmaregs; @@ -88,7 +93,7 @@ int cpdma_chan_submit(struct cpdma_chan *chan, void *token, void *data, int cpdma_chan_process(struct cpdma_chan *chan, int quota); int cpdma_ctlr_int_ctrl(struct cpdma_ctlr *ctlr, bool enable); -void cpdma_ctlr_eoi(struct cpdma_ctlr *ctlr); +void cpdma_ctlr_eoi(struct cpdma_ctlr *ctlr, u32 value); int cpdma_chan_int_ctrl(struct cpdma_chan *chan, bool enable); bool cpdma_check_free_tx_desc(struct cpdma_chan *chan);