linux-kernel - Re: [PATCH v2 2/7] mmc: sdhci_am654: Write ITAPDLY for DDR52 timing

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Date: Mon, 12 Feb 2024 11:13:16 -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>
Subject: Re: [PATCH v2 2/7] mmc: sdhci_am654: Write ITAPDLY for DDR52 timing

On 2/6/24 7:15 PM, Judith Mendez wrote:
> For DDR52 timing, DLL is enabled but tuning is not carried
> out, therefore the ITAPDLY value in PHY CTRL 4 register is
> not correct. Fix this by writing ITAPDLY after enabling DLL.
> 
> Fixes: a161c45f2979 ("mmc: sdhci_am654: Enable DLL only for some speed modes")
> Signed-off-by: Judith Mendez <jm@...com>
> ---
> Changelog:
> v1->v2:
> - Call sdhci_am654_write_itapdly() in sdhci_am654_set_clock()
>   instead of sdhci_am654_setup_dll()
> ---
>   drivers/mmc/host/sdhci_am654.c | 1 +
>   1 file changed, 1 insertion(+)

See how much easier this patch is this way :)

Reviewed-by: Andrew Davis <afd@...com>

> 
> diff --git a/drivers/mmc/host/sdhci_am654.c b/drivers/mmc/host/sdhci_am654.c
> index 2c66a965c225..b50db5d4a452 100644
> --- a/drivers/mmc/host/sdhci_am654.c
> +++ b/drivers/mmc/host/sdhci_am654.c
> @@ -299,6 +299,7 @@ static void sdhci_am654_set_clock(struct sdhci_host *host, unsigned int clock)
>   
>   	if (timing > MMC_TIMING_UHS_SDR25 && clock >= CLOCK_TOO_SLOW_HZ) {
>   		sdhci_am654_setup_dll(host, clock);
> +		sdhci_am654_write_itapdly(sdhci_am654, sdhci_am654->itap_del_sel[timing]);
>   		sdhci_am654->dll_enable = true;
>   	} else {
>   		sdhci_am654_setup_delay_chain(sdhci_am654, timing);