linux-kernel - Re: [PATCH v2 5/5] mailbox: cmdq: fix GCE can not receive hardward event

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Date:   Wed, 14 Jul 2021 14:32:56 +0800
From:   Hsin-Yi Wang <hsinyi@...omium.org>
To:     "jason-jh.lin" <jason-jh.lin@...iatek.com>
Cc:     Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Devicetree List <devicetree@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        Hsin-Yi Wang <hsinyi@...gle.com>, nancy.lin@...iatek.com,
        singo.chang@...iatek.com
Subject: Re: [PATCH v2 5/5] mailbox: cmdq: fix GCE can not receive hardward event

On Mon, Jul 5, 2021 at 1:35 PM jason-jh.lin <jason-jh.lin@...iatek.com> wrote:
>
> For the design of GCE hardware event signal transportation,
> evnet rx will send the event signal to all GCE event merges
> after receiving the event signal from the other hardware.
>
> Because GCE event merges need to response to event rx, their
> clocks must be enabled at that time.
>
> To make sure all the gce clock is enabled while receiving the
> hardware event, each cmdq mailbox should enable or disable
> the others gce clk at the same time.
>
> Signed-off-by: jason-jh.lin <jason-jh.lin@...iatek.com>
> ---
>  drivers/mailbox/mtk-cmdq-mailbox.c | 102 +++++++++++++++++++++++------
>  1 file changed, 83 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-mailbox.c
> index fc67888a677c..44a3cf252fd5 100644
> --- a/drivers/mailbox/mtk-cmdq-mailbox.c
> +++ b/drivers/mailbox/mtk-cmdq-mailbox.c
> @@ -19,6 +19,7 @@
>
>  #define CMDQ_OP_CODE_MASK              (0xff << CMDQ_OP_CODE_SHIFT)
>  #define CMDQ_NUM_CMD(t)                        (t->cmd_buf_size / CMDQ_INST_SIZE)
> +#define CMDQ_GCE_NUM_MAX               (2)
>
>  #define CMDQ_CURR_IRQ_STATUS           0x10
>  #define CMDQ_SYNC_TOKEN_UPDATE         0x68
> @@ -73,14 +74,16 @@ struct cmdq {
>         u32                     thread_nr;
>         u32                     irq_mask;
>         struct cmdq_thread      *thread;
> -       struct clk              *clock;
> +       struct clk              *clock[CMDQ_GCE_NUM_MAX];
>         bool                    suspended;
>         u8                      shift_pa;
> +       u32                     gce_num;
>  };
>
>  struct gce_plat {
>         u32 thread_nr;
>         u8 shift;
> +       u32 gce_num;
>  };
>
>  u8 cmdq_get_shift_pa(struct mbox_chan *chan)
> @@ -120,11 +123,15 @@ static void cmdq_init(struct cmdq *cmdq)
>  {
>         int i;
>
> -       WARN_ON(clk_enable(cmdq->clock) < 0);
> +       for (i = 0; i < cmdq->gce_num; i++)
> +               WARN_ON(clk_enable(cmdq->clock[i]) < 0);
> +
You can use clk_bulk_enable instead of looping. Same for clk_bulk_disable.

<snip>