Re: [PATCH v8, 1/4] mailbox: mtk-cmdq: add gce software ddr enable private data

[yongqiang.niu <yongqiang.niu@mediatek.com>]

On Mon, 2022-10-03 at 12:00 +0800, CK Hu (胡俊光) wrote:
> Hi, Yongqiang:
> 
> On Sat, 2022-10-01 at 00:06 +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.
> > 
> > Signed-off-by: Yongqiang Niu <yongqiang.niu@mediatek.com>
> > ---
> >  drivers/mailbox/mtk-cmdq-mailbox.c | 9 +++++++++
> >  1 file changed, 9 insertions(+)
> > 
> > diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c
> > b/drivers/mailbox/mtk-cmdq-mailbox.c
> > index 9465f9081515..88db6b4642db 100644
> > --- a/drivers/mailbox/mtk-cmdq-mailbox.c
> > +++ b/drivers/mailbox/mtk-cmdq-mailbox.c
> > @@ -38,6 +38,8 @@
> >  #define CMDQ_THR_PRIORITY		0x40
> >  
> >  #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
> > @@ -80,6 +82,7 @@ struct cmdq {
> >  	bool			suspended;
> >  	u8			shift_pa;
> >  	bool			control_by_sw;
> > +	bool			sw_ddr_en;
> >  	u32			gce_num;
> >  };
> >  
> > @@ -87,6 +90,7 @@ struct gce_plat {
> >  	u32 thread_nr;
> >  	u8 shift;
> >  	bool control_by_sw;
> > +	bool sw_ddr_en;
> >  	u32 gce_num;
> >  };
> >  
> > @@ -130,6 +134,10 @@ static void cmdq_init(struct cmdq *cmdq)
> >  	WARN_ON(clk_bulk_enable(cmdq->gce_num, cmdq->clocks));
> >  	if (cmdq->control_by_sw)
> >  		writel(0x7, cmdq->base + GCE_GCTL_VALUE);
> > +
> > +	if (cmdq->sw_ddr_en)
> > +		writel(GCE_DDR_EN | GCE_CTRL_BY_SW, cmdq->base +
> > GCE_GCTL_VALUE);
> 
> I think 0x48[18:16]0x48[2:0] and 0x48[2:0] control different things
> and fix
> different problem. So for this patch, you should just control
> 0x48[18:16] and the code would be:
> 
> if (cmdq->sw_ddr_en) {
> 	reg = readl(cmdq->base + GCE_GCTL_VALUE);
> 	reg |= GCE_DDR_EN;
> 	writel(reg, cmdq->base + GCE_GCTL_VALUE);
> }
> 
> Regards,
> CK

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.


> 
> > +
> >  	writel(CMDQ_THR_ACTIVE_SLOT_CYCLES, cmdq->base +
> > CMDQ_THR_SLOT_CYCLES);
> >  	for (i = 0; i <= CMDQ_MAX_EVENT; i++)
> >  		writel(i, cmdq->base + CMDQ_SYNC_TOKEN_UPDATE);
> > @@ -543,6 +551,7 @@ 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,


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