linux-kernel - Re: [PATCH] qcom: sdhci-msm: enable the DLL clock

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Date:	Mon, 11 Apr 2016 15:33:16 +0200
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Sreedhar Sambangi <ssambang@...eaurora.org>
Cc:	Andy Gross <andy.gross@...aro.org>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	qca-upstream.external@....qualcomm.com,
	Ivan Ivanov <ivan.ivanov@...aro.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Georgi Djakov <georgi.djakov@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH] qcom: sdhci-msm: enable the DLL clock

+ Adrian

On 5 April 2016 at 09:46, Sreedhar Sambangi <ssambang@...eaurora.org> wrote:
> The DLL clock has to be enabled until the correct
> clock frequency is delivered to DLL
> '1'(default) - DLL clock is disabled
> '0' - dll clock has legacly clock enable.
>
> Signed-off-by: Varadarajan Narayanan <varada@...eaurora.org>
> Signed-off-by: Sreedhar Sambangi <ssambang@...eaurora.org>

Adrian Hunter is the maintainer for sdhci, next time make sure to post to him.

As this seems like fairly trivial change I decided to pick it up
anyway. So applied for next!

Note, that I changed the prefix of the commit message header to "mmc".

Thanks and kind regards
Uffe

> ---
>  drivers/mmc/host/sdhci-msm.c | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
> index 4695bee..95b8b70 100644
> --- a/drivers/mmc/host/sdhci-msm.c
> +++ b/drivers/mmc/host/sdhci-msm.c
> @@ -43,6 +43,9 @@
>  #define CORE_DLL_CONFIG                0x100
>  #define CORE_DLL_STATUS                0x108
>
> +#define CORE_DLL_CONFIG2       0x1b4
> +#define CORE_DLL_CLK_DISABLE   BIT(21)
> +
>  #define CORE_VENDOR_SPEC       0x10c
>  #define CORE_CLK_PWRSAVE       BIT(1)
>
> @@ -326,6 +329,10 @@ static int msm_init_cm_dll(struct sdhci_host *host)
>         writel_relaxed((readl_relaxed(host->ioaddr + CORE_DLL_CONFIG)
>                         | CORE_CK_OUT_EN), host->ioaddr + CORE_DLL_CONFIG);
>
> +       /* Write 0 to DLL_CLOCK_DISABLE bit of DLL_CONFIG_2 register */
> +       writel_relaxed((readl_relaxed(host->ioaddr + CORE_DLL_CONFIG2)
> +               & ~CORE_DLL_CLK_DISABLE), host->ioaddr + CORE_DLL_CONFIG2);
> +
>         /* Wait until DLL_LOCK bit of DLL_STATUS register becomes '1' */
>         while (!(readl_relaxed(host->ioaddr + CORE_DLL_STATUS) &
>                  CORE_DLL_LOCK)) {
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>
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