linux-kernel - Re: [RESEND, PATCH 5/5] mailbox: mtk-cmdq: Add support runtime get and set GCE event

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Message-ID: <ed9fc19a909ee6aeb8fc8eab10020808ea391b38.camel@mediatek.com>
Date: Tue, 5 Mar 2024 03:31:08 +0000
From: CK Hu (胡俊光) <ck.hu@...iatek.com>
To: "jassisinghbrar@...il.com" <jassisinghbrar@...il.com>,
	"matthias.bgg@...il.com" <matthias.bgg@...il.com>,
	Jason-JH Lin (林睿祥) <Jason-JH.Lin@...iatek.com>,
	"chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	Singo Chang (張興國) <Singo.Chang@...iatek.com>,
	Jason-ch Chen (陳建豪)
	<Jason-ch.Chen@...iatek.com>, Shawn Sung (宋孝謙)
	<Shawn.Sung@...iatek.com>, Nancy Lin (林欣螢)
	<Nancy.Lin@...iatek.com>, Project_Global_Chrome_Upstream_Group
	<Project_Global_Chrome_Upstream_Group@...iatek.com>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>,
	"angelogioacchino.delregno@...labora.com"
	<angelogioacchino.delregno@...labora.com>
Subject: Re: [RESEND, PATCH 5/5] mailbox: mtk-cmdq: Add support runtime get
 and set GCE event

Hi, Jason:

On Mon, 2024-03-04 at 15:50 +0000, Jason-JH Lin (林睿祥) wrote:
> Hi CK,
> 
> Thanks for the reviews.
> 
> On Mon, 2024-03-04 at 02:30 +0000, CK Hu (胡俊光) wrote:
> > Hi, Jason:
> > 
> > On Fri, 2024-03-01 at 22:44 +0800, Jason-JH.Lin wrote:
> > > ISP drivers need to get and set GCE event in their runtime
> > > contorl
> > > flow.
> > > So add these functions to support get and set GCE by CPU.
> > > 
> > > Signed-off-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
> > > ---
> > >  drivers/mailbox/mtk-cmdq-mailbox.c       | 37
> > > ++++++++++++++++++++++++
> > >  include/linux/mailbox/mtk-cmdq-mailbox.h |  2 ++
> > >  2 files changed, 39 insertions(+)
> > > 
> > > diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c
> > > b/drivers/mailbox/mtk-cmdq-mailbox.c
> > > index ead2200f39ba..d7c08249c898 100644
> > > --- a/drivers/mailbox/mtk-cmdq-mailbox.c
> > > +++ b/drivers/mailbox/mtk-cmdq-mailbox.c
> > > @@ -25,7 +25,11 @@
> > >  #define CMDQ_GCE_NUM_MAX		(2)
> > >  
> > >  #define CMDQ_CURR_IRQ_STATUS		0x10
> > > +#define CMDQ_SYNC_TOKEN_ID		0x60
> > > +#define CMDQ_SYNC_TOKEN_VALUE		0x64
> > > +#define CMDQ_TOKEN_ID_MASK			GENMASK(9, 0)
> > >  #define CMDQ_SYNC_TOKEN_UPDATE		0x68
> > > +#define CMDQ_TOKEN_UPDATE_VALUE			BIT(16)
> > >  #define CMDQ_THR_SLOT_CYCLES		0x30
> > >  #define CMDQ_THR_BASE			0x100
> > >  #define CMDQ_THR_SIZE			0x80
> > > @@ -83,6 +87,7 @@ struct cmdq {
> > >  	struct cmdq_thread	*thread;
> > >  	struct clk_bulk_data	clocks[CMDQ_GCE_NUM_MAX];
> > >  	bool			suspended;
> > > +	spinlock_t		event_lock; /* lock for gce event */
> > >  };
> > >  
> > >  struct gce_plat {
> > > @@ -113,6 +118,38 @@ u8 cmdq_get_shift_pa(struct mbox_chan *chan)
> > >  }
> > >  EXPORT_SYMBOL(cmdq_get_shift_pa);
> > >  
> > > +void cmdq_set_event(void *chan, u16 event_id)
> > 
> > struct mbox_chan *chan
> > 
> 
> OK, I'll change it.
> 
> > Is the event_id the hardware event id listed in include/dt-
> > bindings/gce 
> > ? I mean CPU could trigger the event which should be trigger by
> > hardware?
> > 
> 
> Yes, this can also trigger the hardware event, but CMDQ user should
> not
> do that. Otherwise, it will cause error in other GCE threads that use
> this hardware event.

So, what event id could client driver use? And how to prevent different
client driver use the same event id?

Regards,
CK

> 
> > > +{
> > > +	struct cmdq *cmdq = container_of(((struct mbox_chan *)chan)-
> > > > mbox,
> > > 
> > > +		typeof(*cmdq), mbox);
> > > +	unsigned long flags;
> > > +
> > > +	spin_lock_irqsave(&cmdq->event_lock, flags);
> > > +
> > > +	writel(CMDQ_TOKEN_UPDATE_VALUE | event_id, cmdq->base +
> > > CMDQ_SYNC_TOKEN_UPDATE);
> > > +
> > > +	spin_unlock_irqrestore(&cmdq->event_lock, flags);
> > > +}
> > > +EXPORT_SYMBOL(cmdq_set_event);
> > > +
> > > +u32 cmdq_get_event(void *chan, u16 event_id)
> > 
> > Does this get the event status? I think event has only two status,
> > set
> > or cleared. So I would like this to return true for set and false
> > for
> > cleared.
> 
> Yes, the event status is 1 or 0. I'll change it to boolean.
> 
> Regards,
> Jason-JH.Lin
> 
> > 
> > Regards,
> > CK
> >