From patchwork Mon Nov 14 08:13:27 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bayi Cheng X-Patchwork-Id: 13041961 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D016BC433FE for ; Mon, 14 Nov 2022 08:46:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:CC :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=oDKA7CSoectOce+RBwaPDMJuw9MOZrz/Lqh4XC9MR48=; b=EMaKsQyqRolZ/B yPsNin53jX3oLGL0hBmJS2l9jTsO8A8zTJl1303najrkLXJ9YO6WsKQKCmD30jbHkyfB3jIvoydLk SVNR9bWy9Y+gtO5CL0CH2mWdQfDEDZSj5fzvOGG4UW+Dm8kwcf5yURmSJz996JHOXFU/Dal9GmpH3 ZsoBvSjJ9tEV7o6zb3BMnVMS0Kl6O43FncxaoFxiId30PZbzaEkMQNyxXJEKAt7Y6z8op+cpnf0eA dnWj+dXs6M77BGQt1PXtXnIYie6PuIDF+s2ojf9FWxKFveVb+SH2gBktdsdhqjbkyi7eLYnnw90mm 43VvDBxvwGunT7yliYpw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1ouV5E-00Gumu-E2; Mon, 14 Nov 2022 08:44:48 +0000 Received: from mailgw02.mediatek.com ([216.200.240.185]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1ouV59-00Gujo-H4; Mon, 14 Nov 2022 08:44:44 +0000 X-UUID: e7c19f23aef440aaa631a33b53c3fe5d-20221114 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:Content-Transfer-Encoding:MIME-Version:Message-ID:Date:Subject:CC:To:From; bh=16ql8s7UXjz7QayRZm19LzIg6ERRvCYLZDA5lHE/kUI=; b=ttFZPNcKo29ZvIlbZeKZbUTxeLqC1lGuSef9jhMhrtqKci8yvLH9AmeG0C/PDbLO1gdII++uOiwrGDiLudRfrcAFh2KDqYpDh61FioWL6CMcL/KjNcGekQRVRBBFNiSbapWwancHy0lhFejaW1YuSYd0cU1ftHTUdFx6c6+tTgc=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.12,REQID:f5c17a52-8062-4b09-829a-a49b540c09a9,IP:0,U RL:0,TC:0,Content:-25,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTIO N:release,TS:-25 X-CID-META: VersionHash:62cd327,CLOUDID:d132aedd-c087-4fa8-aefb-7a0acf417f59,B ulkID:nil,BulkQuantity:0,Recheck:0,SF:102,TC:nil,Content:0,EDM:-3,IP:nil,U RL:0,File:nil,Bulk:nil,QS:nil,BEC:nil,COL:0 X-UUID: e7c19f23aef440aaa631a33b53c3fe5d-20221114 Received: from mtkmbs11n1.mediatek.inc [(172.21.101.185)] by mailgw02.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 561581450; Mon, 14 Nov 2022 01:44:30 -0700 Received: from mtkmbs11n2.mediatek.inc (172.21.101.187) by mtkmbs10n2.mediatek.inc (172.21.101.183) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.792.3; Mon, 14 Nov 2022 16:13:52 +0800 Received: from localhost.localdomain (10.17.3.154) by mtkmbs11n2.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.792.15 via Frontend Transport; Mon, 14 Nov 2022 16:13:46 +0800 From: Bayi Cheng To: Mark Brown , Matthias Brugger , Ikjoon Jang CC: , , , , , bayi cheng Subject: [PATCH v2] spi: spi-mtk-nor: Optimize timeout for dma read Date: Mon, 14 Nov 2022 16:13:27 +0800 Message-ID: <20221114081327.25750-1-bayi.cheng@mediatek.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221114_004443_596944_1BB36624 X-CRM114-Status: GOOD ( 13.23 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: bayi cheng The timeout value of the current dma read is unreasonable. For example, If the spi flash clock is 26Mhz, It will takes about 1.3ms to read a 4KB data in spi mode. But the actual measurement exceeds 50s when a dma read timeout is encountered. In order to be more accurately, It is necessary to use usecs_to_jiffies, After modification, the measured timeout value is about 130ms. Signed-off-by: bayi cheng Reviewed-by: AngeloGioacchino Del Regno --- Change in v2: -Change the type of "timeout" from ulong to u32. -Replace max_t with max. -Replace msecs_to_jiffies with usecs_to_jiffies. --- --- drivers/spi/spi-mtk-nor.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/spi/spi-mtk-nor.c b/drivers/spi/spi-mtk-nor.c index d167699a1a96..58eca18b28b0 100644 --- a/drivers/spi/spi-mtk-nor.c +++ b/drivers/spi/spi-mtk-nor.c @@ -354,7 +354,7 @@ static int mtk_nor_dma_exec(struct mtk_nor *sp, u32 from, unsigned int length, dma_addr_t dma_addr) { int ret = 0; - ulong delay; + u32 delay, timeout; u32 reg; writel(from, sp->base + MTK_NOR_REG_DMA_FADR); @@ -376,15 +376,16 @@ static int mtk_nor_dma_exec(struct mtk_nor *sp, u32 from, unsigned int length, mtk_nor_rmw(sp, MTK_NOR_REG_DMA_CTL, MTK_NOR_DMA_START, 0); delay = CLK_TO_US(sp, (length + 5) * BITS_PER_BYTE); + timeout = (delay + 1) * 100; if (sp->has_irq) { if (!wait_for_completion_timeout(&sp->op_done, - (delay + 1) * 100)) + usecs_to_jiffies(max(timeout, 10000U)))) ret = -ETIMEDOUT; } else { ret = readl_poll_timeout(sp->base + MTK_NOR_REG_DMA_CTL, reg, !(reg & MTK_NOR_DMA_START), delay / 3, - (delay + 1) * 100); + timeout); } if (ret < 0)