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

* Re: [PATCH] mmc: mediatek: add wait dma stop done flow
       [not found] <20210806023055.29524-1-derong.liu@mediatek.com>
@ 2021-08-06 10:42 ` Matthias Brugger
  0 siblings, 0 replies; only message in thread
From: Matthias Brugger @ 2021-08-06 10:42 UTC (permalink / raw)
  To: Derong Liu, Chaotian Jing, Ulf Hansson
  Cc: linux-mmc, linux-arm-kernel, linux-mediatek, linux-kernel,
	wsp_upstream, Peng Zhou

Thanks for your patch.

On 06/08/2021 04:30, Derong Liu wrote:
> From: mtk13858 <derong.liu@mediatek.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@mediatek.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);
>  	}
>  }
> 

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