linux-kernel - [PATCH] mmc: mediatek: add wait dma stop done flow

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Date:   Fri, 6 Aug 2021 10:30:55 +0800
From:   Derong Liu <derong.liu@...iatek.com>
To:     Chaotian Jing <chaotian.jing@...iatek.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>
CC:     <linux-mmc@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <wsp_upstream@...iatek.com>,
        Peng Zhou <peng.zhou@...iatek.com>,
        Derong Liu <derong.liu@...iatek.com>
Subject: [PATCH] mmc: mediatek: add wait dma stop done flow

From: mtk13858 <derong.liu@...iatek.com>

it needs to wait for dma stop done after set dma stop.

Signed-off-by: mtk13858 <derong.liu@...iatek.com>
---
 drivers/mmc/host/mtk-sd.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index 4dfc246c5f95..1dfd2842471b 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -2339,6 +2339,8 @@ static void msdc_cqe_disable(struct mmc_host *mmc, bool recovery)
 	if (recovery) {
 		sdr_set_field(host->base + MSDC_DMA_CTRL,
 			      MSDC_DMA_CTRL_STOP, 1);
+		while (readl(host->base + MSDC_DMA_CFG) & MSDC_DMA_CFG_STS)
+			cpu_relax();
 		msdc_reset_hw(host);
 	}
 }
-- 
2.18.0