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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 77C3AC49EAB for ; Mon, 21 Jun 2021 17:52:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6081C61261 for ; Mon, 21 Jun 2021 17:52:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231933AbhFURyd (ORCPT ); Mon, 21 Jun 2021 13:54:33 -0400 Received: from mail.kernel.org ([198.145.29.99]:38312 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231706AbhFURyU (ORCPT ); Mon, 21 Jun 2021 13:54:20 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 6B054611CE; Mon, 21 Jun 2021 17:52:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1624297925; bh=B7X9n0KxSfKATjIy3luIVXkiz2zILgPhXb7wwnPFLKM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oJ98WArBW+YWzHyOWzH7ttjd/FMMHqSkqzpIu30QgeM/3SOL6DUrd9rcTQ6D02hp5 hgRNzjbxD4IC2khNAkNf64AvJrGydkwpGX3wgC2et40UVSAr1sI13oAXdVvZBSE17M pb3bFP5El6NLgmwpva0ff6RM+f59w8JymgkmKjgFsmbxWa9g3J5LkDN/GveR5fOeoy iKc8jmfBd4OtY5OuqKVC4pdxMnbGNnvp39Q5xEHszCrprVMYbAtO+/W+SmvYC2/FI8 OKz2inHdg0xfb8wkOxgmIX3Wl055VKEadTnnCEogDvUKy8nBD4QFio8A1TscoWr2yV HrA1eLFItANZA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Laurent Pinchart , Jianqiang Chen , Vinod Koul , Sasha Levin , dmaengine@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH AUTOSEL 5.12 04/39] dmaengine: xilinx: dpdma: Limit descriptor IDs to 16 bits Date: Mon, 21 Jun 2021 13:51:20 -0400 Message-Id: <20210621175156.735062-4-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210621175156.735062-1-sashal@kernel.org> References: <20210621175156.735062-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Laurent Pinchart [ Upstream commit 9f007e7b6643799e2a6538a5fe04f51c371c6657 ] While the descriptor ID is stored in a 32-bit field in the hardware descriptor, only 16 bits are used by the hardware and are reported through the XILINX_DPDMA_CH_DESC_ID register. Failure to handle the wrap-around results in a descriptor ID mismatch after 65536 frames. Fix it. Signed-off-by: Laurent Pinchart Tested-by: Jianqiang Chen Reviewed-by: Jianqiang Chen Link: https://lore.kernel.org/r/20210520152420.23986-5-laurent.pinchart@ideasonboard.com Signed-off-by: Vinod Koul Signed-off-by: Sasha Levin --- drivers/dma/xilinx/xilinx_dpdma.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/dma/xilinx/xilinx_dpdma.c b/drivers/dma/xilinx/xilinx_dpdma.c index 70b29bd079c9..249ce3988a59 100644 --- a/drivers/dma/xilinx/xilinx_dpdma.c +++ b/drivers/dma/xilinx/xilinx_dpdma.c @@ -113,6 +113,7 @@ #define XILINX_DPDMA_CH_VDO 0x020 #define XILINX_DPDMA_CH_PYLD_SZ 0x024 #define XILINX_DPDMA_CH_DESC_ID 0x028 +#define XILINX_DPDMA_CH_DESC_ID_MASK GENMASK(15, 0) /* DPDMA descriptor fields */ #define XILINX_DPDMA_DESC_CONTROL_PREEMBLE 0xa5 @@ -866,7 +867,8 @@ static void xilinx_dpdma_chan_queue_transfer(struct xilinx_dpdma_chan *chan) * will be used, but it should be enough. */ list_for_each_entry(sw_desc, &desc->descriptors, node) - sw_desc->hw.desc_id = desc->vdesc.tx.cookie; + sw_desc->hw.desc_id = desc->vdesc.tx.cookie + & XILINX_DPDMA_CH_DESC_ID_MASK; sw_desc = list_first_entry(&desc->descriptors, struct xilinx_dpdma_sw_desc, node); @@ -1086,7 +1088,8 @@ static void xilinx_dpdma_chan_vsync_irq(struct xilinx_dpdma_chan *chan) if (!chan->running || !pending) goto out; - desc_id = dpdma_read(chan->reg, XILINX_DPDMA_CH_DESC_ID); + desc_id = dpdma_read(chan->reg, XILINX_DPDMA_CH_DESC_ID) + & XILINX_DPDMA_CH_DESC_ID_MASK; /* If the retrigger raced with vsync, retry at the next frame. */ sw_desc = list_first_entry(&pending->descriptors, -- 2.30.2