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From:   Yong Wu <yong.wu@mediatek.com>
To:     Matthias Brugger <matthias.bgg@gmail.com>,
        Joerg Roedel <joro@8bytes.org>,
        Will Deacon <will.deacon@arm.com>
CC:     Evan Green <evgreen@chromium.org>,
        Robin Murphy <robin.murphy@arm.com>,
        Tomasz Figa <tfiga@google.com>,
        <linux-mediatek@lists.infradead.org>,
        <srv_heupstream@mediatek.com>, <linux-kernel@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <iommu@lists.linux-foundation.org>, <yong.wu@mediatek.com>,
        <youlin.pei@mediatek.com>, Nicolas Boichat <drinkcat@chromium.org>,
        <anan.sun@mediatek.com>, <cui.zhang@mediatek.com>,
        <chao.hao@mediatek.com>
Subject: [PATCH v2 4/4] iommu/mediatek: Reduce the tlb flush timeout value
Date:   Wed, 9 Oct 2019 21:19:03 +0800
Message-ID: <1570627143-29441-4-git-send-email-yong.wu@mediatek.com>
In-Reply-To: <1570627143-29441-1-git-send-email-yong.wu@mediatek.com>
References: <1570627143-29441-1-git-send-email-yong.wu@mediatek.com>
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Sender: linux-kernel-owner@vger.kernel.org
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Reduce the tlb timeout value from 100000us to 1000us. the original value
is so long that affect the multimedia performance. This is only a minor
improvement rather than fixing a issue.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
---
 drivers/iommu/mtk_iommu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 607f92c..1e9ff25 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -195,7 +195,7 @@ static void mtk_iommu_tlb_add_flush(unsigned long iova, size_t size,
 		 * follows tlb_flush to avoid break the sequence.
 		 */
 		ret = readl_poll_timeout_atomic(data->base + REG_MMU_CPE_DONE,
-						tmp, tmp != 0, 10, 100000);
+						tmp, tmp != 0, 10, 1000);
 		if (ret) {
 			dev_warn(data->dev,
 				 "Partial TLB flush timed out, falling back to full flush\n");
-- 
1.9.1