From patchwork Fri May 5 09:57:49 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Petazzoni X-Patchwork-Id: 9713253 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 0DAD36038F for ; Fri, 5 May 2017 09:58:10 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1F704286BC for ; Fri, 5 May 2017 09:58:10 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 11332286C8; Fri, 5 May 2017 09:58:10 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6639D286BC for ; Fri, 5 May 2017 09:58:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752795AbdEEJ6F (ORCPT ); Fri, 5 May 2017 05:58:05 -0400 Received: from mail.free-electrons.com ([62.4.15.54]:55515 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752718AbdEEJ57 (ORCPT ); Fri, 5 May 2017 05:57:59 -0400 Received: by mail.free-electrons.com (Postfix, from userid 110) id 5DEB821308; Fri, 5 May 2017 11:57:58 +0200 (CEST) Received: from localhost (LStLambert-657-1-97-87.w90-63.abo.wanadoo.fr [90.63.216.87]) by mail.free-electrons.com (Postfix) with ESMTPSA id 36A4B206EF; Fri, 5 May 2017 11:57:58 +0200 (CEST) From: Thomas Petazzoni To: Vinod Koul , dmaengine@vger.kernel.org Cc: Nadav Haklai , Hanna Hawa , Yehuda Yitschak , Jason Cooper , Andrew Lunn , Sebastian Hesselbarth , Gregory Clement , linux-arm-kernel@lists.infradead.org, Thomas Petazzoni , stable@vger.kernel.org Subject: [PATCH 06/10] dma: mv_xor_v2: remove interrupt coalescing Date: Fri, 5 May 2017 11:57:49 +0200 Message-Id: <1493978274-12805-7-git-send-email-thomas.petazzoni@free-electrons.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1493978274-12805-1-git-send-email-thomas.petazzoni@free-electrons.com> References: <1493978274-12805-1-git-send-email-thomas.petazzoni@free-electrons.com> Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The current implementation of interrupt coalescing doesn't work, because it doesn't configure the coalescing timer, which is needed to make sure we get an interrupt at some point. As a fix for stable, we simply remove the interrupt coalescing functionality. It will be re-introduced properly in a future commit. Fixes: 19a340b1a820 ("dmaengine: mv_xor_v2: new driver") Cc: Signed-off-by: Thomas Petazzoni --- drivers/dma/mv_xor_v2.c | 25 ------------------------- 1 file changed, 25 deletions(-) diff --git a/drivers/dma/mv_xor_v2.c b/drivers/dma/mv_xor_v2.c index 4684ece..b133fe2 100644 --- a/drivers/dma/mv_xor_v2.c +++ b/drivers/dma/mv_xor_v2.c @@ -246,22 +246,6 @@ static int mv_xor_v2_set_desc_size(struct mv_xor_v2_device *xor_dev) return MV_XOR_V2_EXT_DESC_SIZE; } -/* - * Set the IMSG threshold - */ -static inline -void mv_xor_v2_set_imsg_thrd(struct mv_xor_v2_device *xor_dev, int thrd_val) -{ - u32 reg; - - reg = readl(xor_dev->dma_base + MV_XOR_V2_DMA_IMSG_THRD_OFF); - - reg &= (~MV_XOR_V2_DMA_IMSG_THRD_MASK << MV_XOR_V2_DMA_IMSG_THRD_SHIFT); - reg |= (thrd_val << MV_XOR_V2_DMA_IMSG_THRD_SHIFT); - - writel(reg, xor_dev->dma_base + MV_XOR_V2_DMA_IMSG_THRD_OFF); -} - static irqreturn_t mv_xor_v2_interrupt_handler(int irq, void *data) { struct mv_xor_v2_device *xor_dev = data; @@ -277,12 +261,6 @@ static irqreturn_t mv_xor_v2_interrupt_handler(int irq, void *data) if (!ndescs) return IRQ_NONE; - /* - * Update IMSG threshold, to disable new IMSG interrupts until - * end of the tasklet - */ - mv_xor_v2_set_imsg_thrd(xor_dev, MV_XOR_V2_DESC_NUM); - /* schedule a tasklet to handle descriptors callbacks */ tasklet_schedule(&xor_dev->irq_tasklet); @@ -607,9 +585,6 @@ static void mv_xor_v2_tasklet(unsigned long data) /* free the descriptores */ mv_xor_v2_free_desc_from_desq(xor_dev, num_of_pending); } - - /* Update IMSG threshold, to enable new IMSG interrupts */ - mv_xor_v2_set_imsg_thrd(xor_dev, 0); } /*