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Message-ID: <ff94997b-e01d-44e5-881f-9ecdeed78bc5@intel.com>
Date: Thu, 4 Apr 2024 11:28:01 +0300
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Subject: Re: [PATCH v1] mmc: sdhci-of-dwcmshc: th1520: Increase tuning loop
 count to 128
To: Maksim Kiselev <bigunclemax@gmail.com>
Cc: Drew Fustini <drew@pdp7.com>, Xi Ruoyao <xry111@xry111.site>,
 Ulf Hansson <ulf.hansson@linaro.org>, linux-mmc@vger.kernel.org,
 linux-kernel@vger.kernel.org
References: <20240402093539.184287-1-bigunclemax@gmail.com>
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From: Adrian Hunter <adrian.hunter@intel.com>
Organization: Intel Finland Oy, Registered Address: PL 281, 00181 Helsinki,
 Business Identity Code: 0357606 - 4, Domiciled in Helsinki
In-Reply-To: <20240402093539.184287-1-bigunclemax@gmail.com>
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On 2/04/24 12:35, Maksim Kiselev wrote:
> Fix SD card tuning error by increasing tuning loop count
> from 40(MAX_TUNING_LOOP) to 128.
> 
> For some reason the tuning algorithm requires to move through all the taps
> of delay line even if the THRESHOLD_MODE (bit 2 in AT_CTRL_R) is used
> instead of the LARGEST_WIN_MODE.
> 
> Tested-by: Drew Fustini <drew@pdp7.com>
> Tested-by: Xi Ruoyao <xry111@xry111.site>
> Signed-off-by: Maksim Kiselev <bigunclemax@gmail.com>

Acked-by: Adrian Hunter <adrian.hunter@intel.com>

> ---
> Previous discussion was here:
> https://lore.kernel.org/lkml/CALHCpMhc1F5Ue7U_gsDXREHUZRVQJNYRCJxYxoNqbN=-39jf7A@mail.gmail.com/
> 
>  drivers/mmc/host/sdhci-of-dwcmshc.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c
> index 8d6cfb648096..1001b6ea1a89 100644
> --- a/drivers/mmc/host/sdhci-of-dwcmshc.c
> +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c
> @@ -706,6 +706,7 @@ static int th1520_execute_tuning(struct sdhci_host *host, u32 opcode)
>  
>  	/* perform tuning */
>  	sdhci_start_tuning(host);
> +	host->tuning_loop_count = 128;
>  	host->tuning_err = __sdhci_execute_tuning(host, opcode);
>  	if (host->tuning_err) {
>  		/* disable auto-tuning upon tuning error */