linux-kernel - Re: [PATCH/RESEND 05/12] msm: iommu: Convert to clk

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Message-ID: <20130620164051.GC6300@codeaurora.org>
Date:	Thu, 20 Jun 2013 09:40:51 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Joerg Roedel <joro@...tes.org>
Cc:	David Brown <davidb@...eaurora.org>,
	Daniel Walker <dwalker@...o99.com>,
	Bryan Huntsman <bryanh@...eaurora.org>,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH/RESEND 05/12] msm: iommu: Convert to
 clk_prepare/unprepare

Sending to correct Joerg address.

On 06/17, Stephen Boyd wrote:
> Add calls to clk_prepare and unprepare so that MSM can migrate to
> the common clock framework. We never unprepare the clocks until
> driver remove because the clocks are enabled and disabled in irq
> context. Finer grained power management is possible in the future
> via runtime power management techniques.
> 
> Cc: Joerg Roedel <joerg.roedel@....com>
> Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
> ---
>  drivers/iommu/msm_iommu_dev.c | 17 ++++++++++-------
>  1 file changed, 10 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/iommu/msm_iommu_dev.c b/drivers/iommu/msm_iommu_dev.c
> index 8e8fb07..d344f6a 100644
> --- a/drivers/iommu/msm_iommu_dev.c
> +++ b/drivers/iommu/msm_iommu_dev.c
> @@ -160,7 +160,7 @@ static int msm_iommu_probe(struct platform_device *pdev)
>  		goto fail;
>  	}
>  
> -	ret = clk_enable(iommu_pclk);
> +	ret = clk_prepare_enable(iommu_pclk);
>  	if (ret)
>  		goto fail_enable;
>  
> @@ -170,7 +170,7 @@ static int msm_iommu_probe(struct platform_device *pdev)
>  		if (clk_get_rate(iommu_clk) == 0)
>  			clk_set_min_rate(iommu_clk, 1);
>  
> -		ret = clk_enable(iommu_clk);
> +		ret = clk_prepare_enable(iommu_clk);
>  		if (ret) {
>  			clk_put(iommu_clk);
>  			goto fail_pclk;
> @@ -261,7 +261,7 @@ fail_clk:
>  		clk_put(iommu_clk);
>  	}
>  fail_pclk:
> -	clk_disable(iommu_pclk);
> +	clk_disable_unprepare(iommu_pclk);
>  fail_enable:
>  	clk_put(iommu_pclk);
>  fail:
> @@ -275,8 +275,11 @@ static int msm_iommu_remove(struct platform_device *pdev)
>  
>  	drv = platform_get_drvdata(pdev);
>  	if (drv) {
> -		if (drv->clk)
> +		if (drv->clk) {
> +			clk_unprepare(drv->clk);
>  			clk_put(drv->clk);
> +		}
> +		clk_unprepare(drv->pclk);
>  		clk_put(drv->pclk);
>  		memset(drv, 0, sizeof(*drv));
>  		kfree(drv);
> @@ -314,14 +317,14 @@ static int msm_iommu_ctx_probe(struct platform_device *pdev)
>  	INIT_LIST_HEAD(&ctx_drvdata->attached_elm);
>  	platform_set_drvdata(pdev, ctx_drvdata);
>  
> -	ret = clk_enable(drvdata->pclk);
> +	ret = clk_prepare_enable(drvdata->pclk);
>  	if (ret)
>  		goto fail;
>  
>  	if (drvdata->clk) {
> -		ret = clk_enable(drvdata->clk);
> +		ret = clk_prepare_enable(drvdata->clk);
>  		if (ret) {
> -			clk_disable(drvdata->pclk);
> +			clk_disable_unprepare(drvdata->pclk);
>  			goto fail;
>  		}
>  	}
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> hosted by The Linux Foundation
> 
> --
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