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

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Date: Mon, 4 Mar 2024 11:06:02 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: "Jason-JH.Lin" <jason-jh.lin@...iatek.com>,
 Jassi Brar <jassisinghbrar@...il.com>,
 Chun-Kuang Hu <chunkuang.hu@...nel.org>,
 Matthias Brugger <matthias.bgg@...il.com>
Cc: Jason-ch Chen <jason-ch.chen@...iatek.com>,
 Singo Chang <singo.chang@...iatek.com>, Nancy Lin <nancy.lin@...iatek.com>,
 Shawn Sung <shawn.sung@...iatek.com>, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org,
 Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH 5/5] mailbox: mtk-cmdq: Add support runtime get and set
 GCE event

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@...iatek.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__ */