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

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Message-ID: <82463a28-822b-4612-aed5-1be21c13acf4@intel.com>
Date: Fri, 16 Feb 2024 19:09:43 +0200
From: Adrian Hunter <adrian.hunter@...el.com>
To: Judith Mendez <jm@...com>
Cc: linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
 Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: [PATCH v2 2/7] mmc: sdhci_am654: Write ITAPDLY for DDR52 timing

On 7/02/24 03:15, 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")

Note that the Fixes tags make a different ordering
than the patch order i.e.

Patch	Fixes		in version
1 	13ebeae68ac9 	v5.10-rc1
2 	a161c45f2979 	v5.7-rc1
3 	8ee5fc0e0b3b 	v5.7-rc1
4 	8ee5fc0e0b3b 	v5.7-rc1
4 	a0a62497f6aa 	v5.10-rc1
5 	fe52e2fbc6ef 	v5.9-rc1
6 	1accbced1c32 	v5.3-rc1
7 	a161c45f2979 	v5.7-rc1

That might make backporting these patches more challenging.

> 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(+)
> 
> 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);