linux-kernel - Re: [PATCH v2] mmc: dw_mmc: revise the reset path in runtime resume

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Message-id: <55367081-6471-bc41-5311-37306395a926@samsung.com>
Date:   Thu, 05 Jan 2017 10:20:52 +0900
From:   Jaehoon Chung <jh80.chung@...sung.com>
To:     Ziyuan Xu <xzy.xu@...k-chips.com>, ulf.hansson@...aro.org,
        shawn.lin@...k-chips.com
Cc:     linux-mmc@...r.kernel.org, randy.li@...k-chips.com,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mmc: dw_mmc: revise the reset path in runtime resume

Hi, 

On 01/04/2017 09:51 PM, Ziyuan Xu wrote:
> Immediately after reset, issue the command which sets
> update_clock_register_only bit, the card clock will restart. Revise
> dw_mci_ctrl_reset to dw_mci_reset, which has wrapped this sequence.
> 
> The patch fixes commit e9ed8835e990 ("mmc: dw_mmc: add runtime PM
> callback"). MMC_PM_KEEP_POWEP is disabled for SD card and eMMC slots, so
> that they have no chance to invoke dw_mci_setup_bus for update clock
> behaviour. Let's consummate it.
> 
> Reported-by: Randy Li <randy.li@...k-chips.com>
> Signed-off-by: Ziyuan Xu <xzy.xu@...k-chips.com>

Doesn't it need Shawn's Signed-off tag?

Best Regards,
Jaehoon Chung

> 
> ---
> 
> Changes in v2:
> - update the commit message
> - use dw_mci_reset instead of dw_mci_ctrl_reset
> 
>  drivers/mmc/host/dw_mmc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index b44306b..ed63237 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -3324,7 +3324,7 @@ int dw_mci_runtime_resume(struct device *dev)
>  	if (ret)
>  		goto err;
>  
> -	if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS)) {
> +	if (!dw_mci_reset(host)) {
>  		clk_disable_unprepare(host->ciu_clk);
>  		ret = -ENODEV;
>  		goto err;
>