linux-kernel - Re: [PATCH v10, 2/4] mailbox: mtk-cmdq: add gce software ddr enable private data

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Date:   Tue, 18 Oct 2022 05:35:34 +0000
From:   CK Hu (胡俊光) <ck.hu@...iatek.com>
To:     Yongqiang Niu (牛永强) 
        <yongqiang.niu@...iatek.com>,
        "chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>
CC:     "jassisinghbrar@...il.com" <jassisinghbrar@...il.com>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        "hsinyi@...omium.org" <hsinyi@...omium.org>
Subject: Re: [PATCH v10, 2/4] mailbox: mtk-cmdq: add gce software ddr enable
 private data

Hi, Yongqiang:

On Mon, 2022-10-10 at 16:50 +0800, Yongqiang Niu wrote:
> if gce work control by software, we need set software enable
> for MT8186 Soc
> 
> there is a handshake flow between gce and ddr hardware,
> if not set ddr enable flag of gce, ddr will fall into idle
> mode, then gce instructions will not process done.
> we need set this flag of gce to tell ddr when gce is idle or busy
> controlled by software flow.
> 
> 0x48[2:0] means control by software
> 0x48[18:16] means ddr enable
> 0x48[2:0] is pre-condition of 0x48[18:16].
> if we want set 0x48[18:16] ddr enable, 0x48[2:0] must be set at same
> time.
> and only these bits is useful, other bits is useless bits

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

> 
> Signed-off-by: Yongqiang Niu <yongqiang.niu@...iatek.com>
> ---
>  drivers/mailbox/mtk-cmdq-mailbox.c | 12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c
> b/drivers/mailbox/mtk-cmdq-mailbox.c
> index c3cb24f51699..d2363c6b8b7a 100644
> --- a/drivers/mailbox/mtk-cmdq-mailbox.c
> +++ b/drivers/mailbox/mtk-cmdq-mailbox.c
> @@ -39,6 +39,7 @@
>  
>  #define GCE_GCTL_VALUE			0x48
>  #define GCE_CTRL_BY_SW				GENMASK(2, 0)
> +#define GCE_DDR_EN				GENMASK(18, 16)
>  
>  #define CMDQ_THR_ACTIVE_SLOT_CYCLES	0x3200
>  #define CMDQ_THR_ENABLED		0x1
> @@ -81,6 +82,7 @@ struct cmdq {
>  	bool			suspended;
>  	u8			shift_pa;
>  	bool			control_by_sw;
> +	bool			sw_ddr_en;
>  	u32			gce_num;
>  };
>  
> @@ -88,6 +90,7 @@ struct gce_plat {
>  	u32 thread_nr;
>  	u8 shift;
>  	bool control_by_sw;
> +	bool sw_ddr_en;
>  	u32 gce_num;
>  };
>  
> @@ -127,10 +130,16 @@ static void cmdq_thread_resume(struct
> cmdq_thread *thread)
>  static void cmdq_init(struct cmdq *cmdq)
>  {
>  	int i;
> +	u32 gctl_regval = 0;
>  
>  	WARN_ON(clk_bulk_enable(cmdq->gce_num, cmdq->clocks));
>  	if (cmdq->control_by_sw)
> -		writel(GCE_CTRL_BY_SW, cmdq->base + GCE_GCTL_VALUE);
> +		gctl_regval = GCE_CTRL_BY_SW;
> +	if (cmdq->sw_ddr_en)
> +		gctl_regval |= GCE_DDR_EN;
> +
> +	if (gctl_regval)
> +		writel(gctl_regval, cmdq->base + GCE_GCTL_VALUE);
>  
>  	writel(CMDQ_THR_ACTIVE_SLOT_CYCLES, cmdq->base +
> CMDQ_THR_SLOT_CYCLES);
>  	for (i = 0; i <= CMDQ_MAX_EVENT; i++)
> @@ -545,6 +554,7 @@ static int cmdq_probe(struct platform_device
> *pdev)
>  	cmdq->thread_nr = plat_data->thread_nr;
>  	cmdq->shift_pa = plat_data->shift;
>  	cmdq->control_by_sw = plat_data->control_by_sw;
> +	cmdq->sw_ddr_en = plat_data->sw_ddr_en;
>  	cmdq->gce_num = plat_data->gce_num;
>  	cmdq->irq_mask = GENMASK(cmdq->thread_nr - 1, 0);
>  	err = devm_request_irq(dev, cmdq->irq, cmdq_irq_handler,
> IRQF_SHARED,