linux-kernel - Re: [PATCH v1 4/5] mmc: sdhci_am654: Add ITAPDLYSEL in sdhci_j721e_4bit_set

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Date: Thu, 1 Feb 2024 13:57:07 -0600
From: Andrew Davis <afd@...com>
To: Judith Mendez <jm@...com>, Ulf Hansson <ulf.hansson@...aro.org>
CC: Adrian Hunter <adrian.hunter@...el.com>, <linux-mmc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Randolph Sapp <rs@...com>,
        Vignesh
 Raghavendra <vigneshr@...com>
Subject: Re: [PATCH v1 4/5] mmc: sdhci_am654: Add ITAPDLYSEL in
 sdhci_j721e_4bit_set_clock

On 1/31/24 3:50 PM, Judith Mendez wrote:
> Add ITAPDLYSEL to sdhci_j721e_4bit_set_clock function.
> This allows to set the correct ITAPDLY for timings that
> do not carry out tuning.
> 
> Fixes: 1accbced1c32 ("mmc: sdhci_am654: Add Support for 4 bit IP on J721E")

You are adding this as a new feature, and not having a feature doesn't mean
the initial patch was broken. If this patch was backported to kernels only
containing the above patch it would cause more issues, so no need for the
fixes tags on this nor the last patch.

Andrew

> Signed-off-by: Judith Mendez <jm@...com>
> ---
>   drivers/mmc/host/sdhci_am654.c | 10 ++++++++--
>   1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci_am654.c b/drivers/mmc/host/sdhci_am654.c
> index 5ac82bc70706..f5dc981c470d 100644
> --- a/drivers/mmc/host/sdhci_am654.c
> +++ b/drivers/mmc/host/sdhci_am654.c
> @@ -321,6 +321,7 @@ static void sdhci_j721e_4bit_set_clock(struct sdhci_host *host,
>   	unsigned char timing = host->mmc->ios.timing;
>   	u32 otap_del_sel;
>   	u32 itap_del_ena;
> +	u32 itap_del_sel;
>   	u32 mask, val;
>   
>   	/* Setup Output TAP delay */
> @@ -329,12 +330,17 @@ static void sdhci_j721e_4bit_set_clock(struct sdhci_host *host,
>   	mask = OTAPDLYENA_MASK | OTAPDLYSEL_MASK;
>   	val = (0x1 << OTAPDLYENA_SHIFT) | (otap_del_sel << OTAPDLYSEL_SHIFT);
>   
> +	/* Setup Input TAP delay */
>   	itap_del_ena = sdhci_am654->itap_del_ena[timing];
> +	itap_del_sel = sdhci_am654->itap_del_sel[timing];
>   
> -	mask |= ITAPDLYENA_MASK;
> -	val |= (itap_del_ena << ITAPDLYENA_SHIFT);
> +	mask |= ITAPDLYENA_MASK | ITAPDLYSEL_MASK;
> +	val |= (itap_del_ena << ITAPDLYENA_SHIFT) | (itap_del_sel << ITAPDLYSEL_SHIFT);
>   
> +	regmap_update_bits(sdhci_am654->base, PHY_CTRL4, ITAPCHGWIN_MASK,
> +			   1 << ITAPCHGWIN_SHIFT);
>   	regmap_update_bits(sdhci_am654->base, PHY_CTRL4, mask, val);
> +	regmap_update_bits(sdhci_am654->base, PHY_CTRL4, ITAPCHGWIN_MASK, 0);
>   
>   	regmap_update_bits(sdhci_am654->base, PHY_CTRL5, CLKBUFSEL_MASK,
>   			   sdhci_am654->clkbuf_sel);