linux-kernel - Re: [PATCH 2/2] mmc: sdhci-iproc: Set NO_HISPD bit to fix HS50 data hold time problem

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Date:   Tue, 7 May 2019 09:31:16 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Scott Branden <scott.branden@...adcom.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Stefan Wahren <stefan.wahren@...e.com>
Cc:     BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        linux-mmc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Trac Hoang <trac.hoang@...adcom.com>
Subject: Re: [PATCH 2/2] mmc: sdhci-iproc: Set NO_HISPD bit to fix HS50 data
 hold time problem

On 6/05/19 8:01 PM, Scott Branden wrote:
> From: Trac Hoang <trac.hoang@...adcom.com>
> 
> The iproc host eMMC/SD controller hold time does not meet the
> specification in the HS50 mode.  This problem can be mitigated
> by disabling the HISPD bit; thus forcing the controller output
> data to be driven on the falling clock edges rather than the
> rising clock edges.
> 
> Fixes: f5f968f2371c ("mmc: sdhci-iproc: suppress spurious interrupt with Multiblock read")

Is this fixes tag correct, because it doesn't seem related.  Maybe explain
that in the commit message.

> Signed-off-by: Trac Hoang <trac.hoang@...adcom.com>
> Signed-off-by: Scott Branden <scott.branden@...adcom.com>
> ---
>  drivers/mmc/host/sdhci-iproc.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/sdhci-iproc.c b/drivers/mmc/host/sdhci-iproc.c
> index 9d4071c41c94..2feb4ef32035 100644
> --- a/drivers/mmc/host/sdhci-iproc.c
> +++ b/drivers/mmc/host/sdhci-iproc.c
> @@ -220,7 +220,8 @@ static const struct sdhci_iproc_data iproc_cygnus_data = {
>  
>  static const struct sdhci_pltfm_data sdhci_iproc_pltfm_data = {
>  	.quirks = SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
> -		  SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12,
> +		  SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12 |
> +		  SDHCI_QUIRK_NO_HISPD_BIT,
>  	.quirks2 = SDHCI_QUIRK2_ACMD23_BROKEN,
>  	.ops = &sdhci_iproc_ops,
>  };
>