Re: [PATCH v10, 3/4] mailbox: mtk-cmdq: add gce ddr enable support flow

From: CK Hu (胡俊光)
Date: Tue Oct 18 2022 - 01:51:46 EST


Hi, Yongqiang:

On Mon, 2022-10-10 at 16:50 +0800, Yongqiang Niu wrote:
> add gce ddr enable control flow when gce suspend/resume
>
> when all cmdq instruction task has been processed done,
> we need set this gce ddr enable to disable status to tell
> cmdq hardware gce there is none task need process, and the hardware
> can go into idle mode and no access ddr anymore, then the spm can go
> into suspend.
>
> the original issue is gce still access ddr when cmdq suspend function
> call, but there is no task run.
> so, we need control gce access ddr with this flow.
> when cmdq suspend function, there is no task need process, we can
> disable gce access ddr, to make sure system go into suspend success.

Reviewed-by: CK Hu <ck.hu@xxxxxxxxxxxx>

>
> Signed-off-by: Yongqiang Niu <yongqiang.niu@xxxxxxxxxxxx>
> Reviewed-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@xxxxxxxxxxxxx>
> ---
> 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 d2363c6b8b7a..53904511598d 100644
> --- a/drivers/mailbox/mtk-cmdq-mailbox.c
> +++ b/drivers/mailbox/mtk-cmdq-mailbox.c
> @@ -94,6 +94,18 @@ struct gce_plat {
> u32 gce_num;
> };
>
> +static void cmdq_sw_ddr_enable(struct cmdq *cmdq, bool enable)
> +{
> + 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);
> @@ -322,6 +334,9 @@ static int cmdq_suspend(struct device *dev)
> if (task_running)
> dev_warn(dev, "exist running task(s) in suspend\n");
>
> + if (cmdq->sw_ddr_en)
> + cmdq_sw_ddr_enable(cmdq, false);
> +
> clk_bulk_unprepare(cmdq->gce_num, cmdq->clocks);
>
> return 0;
> @@ -333,6 +348,10 @@ static int cmdq_resume(struct device *dev)
>
> WARN_ON(clk_bulk_prepare(cmdq->gce_num, cmdq->clocks));
> cmdq->suspended = false;
> +
> + if (cmdq->sw_ddr_en)
> + cmdq_sw_ddr_enable(cmdq, true);
> +
> return 0;
> }
>
> @@ -340,6 +359,9 @@ static int cmdq_remove(struct platform_device
> *pdev)
> {
> struct cmdq *cmdq = platform_get_drvdata(pdev);
>
> + if (cmdq->sw_ddr_en)
> + cmdq_sw_ddr_enable(cmdq, false);
> +
> clk_bulk_unprepare(cmdq->gce_num, cmdq->clocks);
> return 0;
> }