linux-kernel - Re: [RFT PATCH 3/3] mmc: sdhci-of-arasan: Fix Command Queuing enable handling

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Date:   Fri, 3 Jan 2020 08:36:55 +0800
From:   Shawn Lin <shawn.lin@...k-chips.com>
To:     Faiz Abbas <faiz_abbas@...com>, linux-kernel@...r.kernel.org,
        linux-mmc@...r.kernel.org
Cc:     shawn.lin@...k-chips.com, ulf.hansson@...aro.org,
        adrian.hunter@...el.com
Subject: Re: [RFT PATCH 3/3] mmc: sdhci-of-arasan: Fix Command Queuing enable
 handling


On 2019/12/30 17:23, Faiz Abbas wrote:
> There is a need to dump data from the buffer before enabling command
> queuing because of leftover data from tuning. Reset the data lines to
> fix this at the source.
> 

It seems to work for my platform by porting it to 4.19 LTS.

Tested-by: Shawn Lin <shawn.lin@...k-chips.com>

> Signed-off-by: Faiz Abbas <faiz_abbas@...com>
> ---
>   drivers/mmc/host/sdhci-of-arasan.c | 21 ++++-----------------
>   1 file changed, 4 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
> index e49b44b4d82e..1495ae72b902 100644
> --- a/drivers/mmc/host/sdhci-of-arasan.c
> +++ b/drivers/mmc/host/sdhci-of-arasan.c
> @@ -376,22 +376,8 @@ static void sdhci_arasan_dumpregs(struct mmc_host *mmc)
>   	sdhci_dumpregs(mmc_priv(mmc));
>   }
>   
> -static void sdhci_arasan_cqe_enable(struct mmc_host *mmc)
> -{
> -	struct sdhci_host *host = mmc_priv(mmc);
> -	u32 reg;
> -
> -	reg = sdhci_readl(host, SDHCI_PRESENT_STATE);
> -	while (reg & SDHCI_DATA_AVAILABLE) {
> -		sdhci_readl(host, SDHCI_BUFFER);
> -		reg = sdhci_readl(host, SDHCI_PRESENT_STATE);
> -	}
> -
> -	sdhci_cqe_enable(mmc);
> -}
> -
>   static const struct cqhci_host_ops sdhci_arasan_cqhci_ops = {
> -	.enable         = sdhci_arasan_cqe_enable,
> +	.enable         = sdhci_cqe_enable,
>   	.disable        = sdhci_cqe_disable,
>   	.dumpregs       = sdhci_arasan_dumpregs,
>   };
> @@ -410,8 +396,9 @@ static const struct sdhci_ops sdhci_arasan_cqe_ops = {
>   static const struct sdhci_pltfm_data sdhci_arasan_cqe_pdata = {
>   	.ops = &sdhci_arasan_cqe_ops,
>   	.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
> -	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
> -			SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,
> +	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN	|
> +		   SDHCI_QUIRK2_RESET_DATA_POST_TUNING	|
> +		   SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,
>   };
>   
>   static struct sdhci_arasan_of_data sdhci_arasan_rk3399_data = {
>