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

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Date:   Fri, 6 Aug 2021 12:42:31 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Derong Liu <derong.liu@...iatek.com>,
        Chaotian Jing <chaotian.jing@...iatek.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
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>
Subject: Re: [PATCH] mmc: mediatek: add wait dma stop done flow

Thanks for your patch.

On 06/08/2021 04:30, Derong Liu wrote:
> From: mtk13858 <derong.liu@...iatek.com>
> 
> it needs to wait for dma stop done after set dma stop.
> 

Please provide a better commit message. Which bug do you see on which SoC? Are
you sure you can apply that to all SoC without breaking stuff?

> Signed-off-by: mtk13858 <derong.liu@...iatek.com>

Full name please.

Regards,
Matthias

> ---
>  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);
>  	}
>  }
>