Re: [PATCH v7, 2/3] mailbox: mtk-cmdq: add gce ddr enable support flow

[Matthias Brugger <matthias.bgg@gmail.com>]

On 30/09/2022 11:59, Yongqiang Niu wrote:
> add gce ddr enable control flow when gce suspend/resume
> 
> Signed-off-by: Yongqiang Niu <yongqiang.niu@mediatek.com>
> ---
>   drivers/mailbox/mtk-cmdq-mailbox.c | 22 ++++++++++++++++++++++
>   1 file changed, 22 insertions(+)
> 
> diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-mailbox.c
> index 04eb44d89119..84a60750d0c4 100644
> --- a/drivers/mailbox/mtk-cmdq-mailbox.c
> +++ b/drivers/mailbox/mtk-cmdq-mailbox.c
> @@ -94,6 +94,21 @@ struct gce_plat {
>   	u32 gce_num;
>   };
>   
> +static void cmdq_sw_ddr_enable(struct cmdq *cmdq, bool enable)
> +{
> +	if (!cmdq->sw_ddr_en)
> +		return;
> +
> +	WARN_ON(clk_bulk_enable(cmdq->gce_num, cmdq->clocks));
> +
> +	if (enable)
> +		writel(GCE_DDR_EN | GCE_CTRL_BY_SW, cmdq->base + GCE_GCTL_VALUE);
> +	else
> +		writel(GCE_CTRL_BY_SW, cmdq->base + GCE_GCTL_VALUE);
> +
> +	clk_bulk_disable(cmdq->gce_num, cmdq->clocks);
> +}
> +
>   u8 cmdq_get_shift_pa(struct mbox_chan *chan)
>   {
>   	struct cmdq *cmdq = container_of(chan->mbox, struct cmdq, mbox);
> @@ -319,6 +334,8 @@ static int cmdq_suspend(struct device *dev)
>   	if (task_running)
>   		dev_warn(dev, "exist running task(s) in suspend\n");
>   
> +	cmdq_sw_ddr_enable(cmdq, false);

I'd say
if (!cmdq->sw_ddr_en)
should be checked before calling cmdq_sw_ddr_enable().

Regards,
Matthias

> +
>   	clk_bulk_unprepare(cmdq->gce_num, cmdq->clocks);
>   
>   	return 0;
> @@ -330,6 +347,9 @@ static int cmdq_resume(struct device *dev)
>   
>   	WARN_ON(clk_bulk_prepare(cmdq->gce_num, cmdq->clocks));
>   	cmdq->suspended = false;
> +
> +	cmdq_sw_ddr_enable(cmdq, true);
> +
>   	return 0;
>   }
>   
> @@ -337,6 +357,8 @@ static int cmdq_remove(struct platform_device *pdev)
>   {
>   	struct cmdq *cmdq = platform_get_drvdata(pdev);
>   
> +	cmdq_sw_ddr_enable(cmdq, false);
> +
>   	clk_bulk_unprepare(cmdq->gce_num, cmdq->clocks);
>   	return 0;
>   }