diff mbox series

[5/5] mailbox: mtk-cmdq: Add support runtime get and set GCE event

Message ID 20240301111126.22035-6-jason-jh.lin@mediatek.com (mailing list archive)
State New
Headers show
Series Add CMDQ API for upcoming ISP feature | expand

Commit Message

Jason-JH.Lin March 1, 2024, 11:11 a.m. UTC 
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@mediatek.com>
Change-Id: I494c34ebc5ec26c82213f2bc03d2033d60652523
---
 drivers/mailbox/mtk-cmdq-mailbox.c       | 37 ++++++++++++++++++++++++
 include/linux/mailbox/mtk-cmdq-mailbox.h |  2 ++
 2 files changed, 39 insertions(+)

Comments

AngeloGioacchino Del Regno March 4, 2024, 10:06 a.m. UTC | #1 
Il 01/03/24 12:11, Jason-JH.Lin ha scritto:
> 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@mediatek.com>
> Change-Id: I494c34ebc5ec26c82213f2bc03d2033d60652523

Change-Id makes no sense upstream. Please drop.

> ---
>   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 cmdq *cmdq = container_of(((struct mbox_chan *)chan)->mbox,
> +		typeof(*cmdq), mbox);

struct mbox_chan *mbc = chan;
struct cmdq *cmdq = container_of(mbc->mbox, ... etc); (and this fits in one line)

> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&cmdq->event_lock, flags);

Why do you need irqsave/irqrestore? I think I know, but please explain.

> +
> +	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)
> +{
> +	struct cmdq *cmdq = container_of(((struct mbox_chan *)chan)->mbox,
> +		typeof(*cmdq), mbox);
> +	unsigned long flags;
> +	u32 value = 0;
> +
> +	spin_lock_irqsave(&cmdq->event_lock, flags);
> +
> +	writel(CMDQ_TOKEN_ID_MASK & event_id, cmdq->base + CMDQ_SYNC_TOKEN_ID);
> +	value = readl(cmdq->base + CMDQ_SYNC_TOKEN_VALUE);
> +
> +	spin_unlock_irqrestore(&cmdq->event_lock, flags);
> +
> +	return value;
> +}
> +EXPORT_SYMBOL(cmdq_get_event);
> +
>   static int cmdq_thread_suspend(struct cmdq *cmdq, struct cmdq_thread *thread)
>   {
>   	u32 status;
> diff --git a/include/linux/mailbox/mtk-cmdq-mailbox.h b/include/linux/mailbox/mtk-cmdq-mailbox.h
> index a8f0070c7aa9..f05cabd230da 100644
> --- a/include/linux/mailbox/mtk-cmdq-mailbox.h
> +++ b/include/linux/mailbox/mtk-cmdq-mailbox.h
> @@ -79,5 +79,7 @@ struct cmdq_pkt {
>   };
>   
>   u8 cmdq_get_shift_pa(struct mbox_chan *chan);
> +void cmdq_set_event(void *chan, u16 event_id);
> +u32 cmdq_get_event(void *chan, u16 event_id);
>   
>   #endif /* __MTK_CMDQ_MAILBOX_H__ */
Jason-JH.Lin March 5, 2024, 3:09 a.m. UTC | #2 
Hi Angelo,

Thanks for the reviews.

On Mon, 2024-03-04 at 11:06 +0100, AngeloGioacchino Del Regno wrote:
> Il 01/03/24 12:11, Jason-JH.Lin ha scritto:
> > 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@mediatek.com>
> > Change-Id: I494c34ebc5ec26c82213f2bc03d2033d60652523
> 
> Change-Id makes no sense upstream. Please drop.

OK, I'll drop it.

> 
> > ---
> >   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 cmdq *cmdq = container_of(((struct mbox_chan *)chan)-
> > >mbox,
> > +		typeof(*cmdq), mbox);
> 
> struct mbox_chan *mbc = chan;
> struct cmdq *cmdq = container_of(mbc->mbox, ... etc); (and this fits
> in one line)
> 
OK, I'll change it.

> > +	unsigned long flags;
> > +
> > +	spin_lock_irqsave(&cmdq->event_lock, flags);
> 
> Why do you need irqsave/irqrestore? I think I know, but please
> explain.
> 
Because ISP driver may call cmdq_get_event() first than use
cmdq_set_event() to update the event status in one
mtk_imgsys_setevent() function frequently.

And mtk_imgsys_setevent() will be called in SW multi-thread after cmdq
callback from cmdq_irq_handler, so we use the spin_lock_irqsave to
avoid the race condition.

But after discussing with ISP owners, they dropped
mtk_imgsys_setevent() recently, so I'll drop this patch in the next version.

Regards,
Jason-JH.Lin
AngeloGioacchino Del Regno March 5, 2024, 10:20 a.m. UTC | #3 
Il 05/03/24 04:09, Jason-JH Lin (林睿祥) ha scritto:
> Hi Angelo,
> 
> Thanks for the reviews.
> 
> On Mon, 2024-03-04 at 11:06 +0100, AngeloGioacchino Del Regno wrote:
>> Il 01/03/24 12:11, Jason-JH.Lin ha scritto:
>>> 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@mediatek.com>
>>> Change-Id: I494c34ebc5ec26c82213f2bc03d2033d60652523
>>
>> Change-Id makes no sense upstream. Please drop.
> 
> OK, I'll drop it.
> 
>>
>>> ---
>>>    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 cmdq *cmdq = container_of(((struct mbox_chan *)chan)-
>>>> mbox,
>>> +		typeof(*cmdq), mbox);
>>
>> struct mbox_chan *mbc = chan;
>> struct cmdq *cmdq = container_of(mbc->mbox, ... etc); (and this fits
>> in one line)
>>
> OK, I'll change it.
> 
>>> +	unsigned long flags;
>>> +
>>> +	spin_lock_irqsave(&cmdq->event_lock, flags);
>>
>> Why do you need irqsave/irqrestore? I think I know, but please
>> explain.
>>
> Because ISP driver may call cmdq_get_event() first than use
> cmdq_set_event() to update the event status in one
> mtk_imgsys_setevent() function frequently.
> 
> And mtk_imgsys_setevent() will be called in SW multi-thread after cmdq
> callback from cmdq_irq_handler, so we use the spin_lock_irqsave to
> avoid the race condition.

I was imagining something like that, yes - thank you for explaining.

Cheers,
Angelo
diff mbox series

Patch

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 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)
+{
+	struct cmdq *cmdq = container_of(((struct mbox_chan *)chan)->mbox,
+		typeof(*cmdq), mbox);
+	unsigned long flags;
+	u32 value = 0;
+
+	spin_lock_irqsave(&cmdq->event_lock, flags);
+
+	writel(CMDQ_TOKEN_ID_MASK & event_id, cmdq->base + CMDQ_SYNC_TOKEN_ID);
+	value = readl(cmdq->base + CMDQ_SYNC_TOKEN_VALUE);
+
+	spin_unlock_irqrestore(&cmdq->event_lock, flags);
+
+	return value;
+}
+EXPORT_SYMBOL(cmdq_get_event);
+
 static int cmdq_thread_suspend(struct cmdq *cmdq, struct cmdq_thread *thread)
 {
 	u32 status;
diff --git a/include/linux/mailbox/mtk-cmdq-mailbox.h b/include/linux/mailbox/mtk-cmdq-mailbox.h
index a8f0070c7aa9..f05cabd230da 100644
--- a/include/linux/mailbox/mtk-cmdq-mailbox.h
+++ b/include/linux/mailbox/mtk-cmdq-mailbox.h
@@ -79,5 +79,7 @@  struct cmdq_pkt {
 };
 
 u8 cmdq_get_shift_pa(struct mbox_chan *chan);
+void cmdq_set_event(void *chan, u16 event_id);
+u32 cmdq_get_event(void *chan, u16 event_id);
 
 #endif /* __MTK_CMDQ_MAILBOX_H__ */