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

On Tue, 2022-10-04 at 17:35 +0800, yongqiang.niu wrote:
> 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.

OK, add comment for this.

>
>
> >
> > > +
> > > 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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