linux-kernel - Re: [PATCH] mmc: sdhci-of-arasan: refactor set

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Message-ID: <5721C308.6030607@intel.com>
Date:	Thu, 28 Apr 2016 11:00:08 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Shawn Lin <shawn.lin@...k-chips.com>,
	Ulf Hansson <ulf.hansson@...aro.org>
Cc:	Michal Simek <michal.simek@...inx.com>, soren.brinkmann@...inx.com,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Doug Anderson <dianders@...omium.org>,
	Heiko Stuebner <heiko@...ech.de>,
	linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH] mmc: sdhci-of-arasan: refactor set_clock callback


"refactor" typically means no change in behaviour.
This looks like a fix e.g.
"Fix set_clock when a phy is supported"

On 27/04/16 07:14, Shawn Lin wrote:
> commit 61b914eb81f8 ("mmc: sdhci-of-arasan: add phy support for
> sdhci-of-arasan") introduce phy support for arasan. According to
> the vendor's databook, we should make sure the phy is in poweroff
> status before we configure the clk stuff. Otherwise it may cause
> some IO sample timing issues from the test. And we don't need this
> extra operation while running in low perfermance mode since phy

perfermance -> performance

> doesn't trigger sampling block.
> 
> Signed-off-by: Shawn Lin <shawn.lin@...k-chips.com>
> ---
> 
>  drivers/mmc/host/sdhci-of-arasan.c | 20 +++++++++++++++++++-
>  1 file changed, 19 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
> index 2e482b1..20b859e 100644
> --- a/drivers/mmc/host/sdhci-of-arasan.c
> +++ b/drivers/mmc/host/sdhci-of-arasan.c
> @@ -55,8 +55,26 @@ static unsigned int sdhci_arasan_get_timeout_clock(struct sdhci_host *host)
>  	return freq;
>  }
>  
> +static void sdhci_arasan_set_clock(struct sdhci_host *host, unsigned int clock)
> +{
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
> +	bool ctrl_phy = false;
> +
> +	if (clock > MMC_HIGH_52_MAX_DTR && (!IS_ERR(sdhci_arasan->phy)))
> +		ctrl_phy = true;
> +
> +	if (ctrl_phy)
> +		phy_power_off(sdhci_arasan->phy);
> +
> +	sdhci_set_clock(host, clock);
> +
> +	if (ctrl_phy)
> +		phy_power_on(sdhci_arasan->phy);
> +}
> +
>  static struct sdhci_ops sdhci_arasan_ops = {
> -	.set_clock = sdhci_set_clock,
> +	.set_clock = sdhci_arasan_set_clock,
>  	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
>  	.get_timeout_clock = sdhci_arasan_get_timeout_clock,
>  	.set_bus_width = sdhci_set_bus_width,
>