linux-kernel - Re: [PATCH v5 3/8] remoteproc: Move proxy unvote to handover irq handler

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Date:   Mon, 21 May 2018 21:35:11 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Sibi Sankar <sibis@...eaurora.org>
Cc:     p.zabel@...gutronix.de, robh+dt@...nel.org,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, georgi.djakov@...aro.org,
        jassisinghbrar@...il.com, ohad@...ery.com, mark.rutland@....com,
        kyan@...eaurora.org, sricharan@...eaurora.org,
        akdwived@...eaurora.org, linux-arm-msm@...r.kernel.org,
        tsoni@...eaurora.org
Subject: Re: [PATCH v5 3/8] remoteproc: Move proxy unvote to handover irq
 handler

On Mon 21 May 10:27 PDT 2018, Sibi Sankar wrote:

> Introduce interrupt handler for smp2p ready interrupt to
> handle start completion. Move the proxy votes for clocks
> and regulators to the handover interrupt context.
> 
> Signed-off-by: Sibi Sankar <sibis@...eaurora.org>

I added the "synchronization logic" of patch 4 to this one, to make it
functional and after testing on db820c I merged patch 3 through 8 into
rproc-next.

I skipped the remainder of patch 4, as I think the ready_irq should be
included and I wonder if irq management can remove the need for the
"running" variable.

I also moved the enable_irq before we actually start the core, since
it's been shown downstream that the smp2p irq might fire fast enough for
us to miss it (and the smp2p driver does not redeliver interrupts).

Regards,
Bjorn

> ---
>  drivers/remoteproc/qcom_q6v5_pil.c | 29 +++++++++++++++++++++++------
>  1 file changed, 23 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/remoteproc/qcom_q6v5_pil.c b/drivers/remoteproc/qcom_q6v5_pil.c
> index 76a0c00aa04a..6333bdcd9448 100644
> --- a/drivers/remoteproc/qcom_q6v5_pil.c
> +++ b/drivers/remoteproc/qcom_q6v5_pil.c
> @@ -809,11 +809,6 @@ static int q6v5_start(struct rproc *rproc)
>  			"Failed to reclaim mba buffer system may become unstable\n");
>  	qproc->running = true;
>  
> -	q6v5_clk_disable(qproc->dev, qproc->proxy_clks,
> -			 qproc->proxy_clk_count);
> -	q6v5_regulator_disable(qproc, qproc->proxy_regs,
> -			       qproc->proxy_reg_count);
> -
>  	return 0;
>  
>  reclaim_mpss:
> @@ -892,6 +887,12 @@ static int q6v5_stop(struct rproc *rproc)
>  	WARN_ON(ret);
>  
>  	reset_control_assert(qproc->mss_restart);
> +
> +	q6v5_clk_disable(qproc->dev, qproc->proxy_clks,
> +			 qproc->proxy_clk_count);
> +	q6v5_regulator_disable(qproc, qproc->proxy_regs,
> +			       qproc->proxy_reg_count);
> +
>  	q6v5_clk_disable(qproc->dev, qproc->active_clks,
>  			 qproc->active_clk_count);
>  	q6v5_regulator_disable(qproc, qproc->active_regs,
> @@ -959,7 +960,7 @@ static irqreturn_t q6v5_fatal_interrupt(int irq, void *dev)
>  	return IRQ_HANDLED;
>  }
>  
> -static irqreturn_t q6v5_handover_interrupt(int irq, void *dev)
> +static irqreturn_t q6v5_ready_interrupt(int irq, void *dev)
>  {
>  	struct q6v5 *qproc = dev;
>  
> @@ -967,6 +968,18 @@ static irqreturn_t q6v5_handover_interrupt(int irq, void *dev)
>  	return IRQ_HANDLED;
>  }
>  
> +static irqreturn_t q6v5_handover_interrupt(int irq, void *dev)
> +{
> +	struct q6v5 *qproc = dev;
> +
> +	q6v5_clk_disable(qproc->dev, qproc->proxy_clks,
> +			 qproc->proxy_clk_count);
> +	q6v5_regulator_disable(qproc, qproc->proxy_regs,
> +			       qproc->proxy_reg_count);
> +
> +	return IRQ_HANDLED;
> +}
> +
>  static irqreturn_t q6v5_stop_ack_interrupt(int irq, void *dev)
>  {
>  	struct q6v5 *qproc = dev;
> @@ -1194,6 +1207,10 @@ static int q6v5_probe(struct platform_device *pdev)
>  	if (ret < 0)
>  		goto free_rproc;
>  
> +	ret = q6v5_request_irq(qproc, pdev, "ready", q6v5_ready_interrupt);
> +	if (ret < 0)
> +		goto free_rproc;
> +
>  	ret = q6v5_request_irq(qproc, pdev, "handover", q6v5_handover_interrupt);
>  	if (ret < 0)
>  		goto free_rproc;
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>