linux-kernel - Re: [PATCH v2 1/1] remoteproc: Add support for xo clock

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Date:   Mon, 31 Oct 2016 17:05:55 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Sarangdhar Joshi <spjoshi@...eaurora.org>
Cc:     Ohad Ben-Cohen <ohad@...ery.com>, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Stephen Boyd <sboyd@...eaurora.org>,
        Trilok Soni <tsoni@...eaurora.org>
Subject: Re: [PATCH v2 1/1] remoteproc: Add support for xo clock

On Tue 25 Oct 13:57 PDT 2016, Sarangdhar Joshi wrote:

> Add xo clock support required to boot up Qualcomm ADSP processor.
> The ADSP remoteproc driver keeps xo clock enabled until the
> driver receives "handover" irq, in order to allow ADSP processor
> to vote for xo clock with rpm.

Looks good, thanks.

We have to add the clock to the DT binding and run that by Rob again,
before merging the driver and this patch.

Regards,
Bjorn

> 
> Signed-off-by: Sarangdhar Joshi <spjoshi@...eaurora.org>
> ---
>  drivers/remoteproc/qcom_adsp_pil.c | 30 +++++++++++++++++++++++++++++-
>  1 file changed, 29 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/remoteproc/qcom_adsp_pil.c b/drivers/remoteproc/qcom_adsp_pil.c
> index 9141633..5bb25d1 100644
> --- a/drivers/remoteproc/qcom_adsp_pil.c
> +++ b/drivers/remoteproc/qcom_adsp_pil.c
> @@ -15,6 +15,7 @@
>   * GNU General Public License for more details.
>   */
>  
> +#include <linux/clk.h>
>  #include <linux/firmware.h>
>  #include <linux/interrupt.h>
>  #include <linux/kernel.h>
> @@ -48,6 +49,8 @@ struct qcom_adsp {
>  	struct qcom_smem_state *state;
>  	unsigned stop_bit;
>  
> +	struct clk *xo;
> +
>  	struct regulator *cx_supply;
>  
>  	struct completion start_done;
> @@ -102,10 +105,14 @@ static int adsp_start(struct rproc *rproc)
>  	struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
>  	int ret;
>  
> -	ret = regulator_enable(adsp->cx_supply);
> +	ret = clk_prepare_enable(adsp->xo);
>  	if (ret)
>  		return ret;
>  
> +	ret = regulator_enable(adsp->cx_supply);
> +	if (ret)
> +		goto disable_clocks;
> +
>  	ret = qcom_scm_pas_auth_and_reset(ADSP_PAS_ID);
>  	if (ret) {
>  		dev_err(adsp->dev,
> @@ -126,6 +133,8 @@ static int adsp_start(struct rproc *rproc)
>  
>  disable_regulators:
>  	regulator_disable(adsp->cx_supply);
> +disable_clocks:
> +	clk_disable_unprepare(adsp->xo);
>  
>  	return ret;
>  }
> @@ -223,6 +232,21 @@ static irqreturn_t adsp_stop_ack_interrupt(int irq, void *dev)
>  	return IRQ_HANDLED;
>  }
>  
> +static int adsp_init_clock(struct qcom_adsp *adsp)
> +{
> +	int ret;
> +
> +	adsp->xo = devm_clk_get(adsp->dev, "xo");
> +	if (IS_ERR(adsp->xo)) {
> +		ret = PTR_ERR(adsp->xo);
> +		if (ret != -EPROBE_DEFER)
> +			dev_err(adsp->dev, "failed to get xo clock");
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
>  static int adsp_init_regulator(struct qcom_adsp *adsp)
>  {
>  	adsp->cx_supply = devm_regulator_get(adsp->dev, "cx");
> @@ -320,6 +344,10 @@ static int adsp_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto free_rproc;
>  
> +	ret = adsp_init_clock(adsp);
> +	if (ret)
> +		goto free_rproc;
> +
>  	ret = adsp_init_regulator(adsp);
>  	if (ret)
>  		goto free_rproc;
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>