linux-kernel - Re: [PATCH v5 03/19] mailbox: mtk-cmdq: Add cmdq private data to cmdq

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Message-ID: <6a6aee9658dc467fe7bf9b96e8a8a3f3ac6f182a.camel@mediatek.com>
Date: Mon, 28 Apr 2025 06:13:06 +0000
From: Jason-JH Lin (林睿祥) <Jason-JH.Lin@...iatek.com>
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Subject: Re: [PATCH v5 03/19] mailbox: mtk-cmdq: Add cmdq private data to
 cmdq_pkt for generating instruction

On Fri, 2025-04-25 at 17:28 +0800, Jason-JH Lin wrote:
> Add the cmdq_mbox_priv structure to store the private data of GCE,
> such as the shift bits of the physical address. Then, include the
> cmdq_mbox_priv structure within the cmdq_pkt structure.
> 
> This allows CMDQ users to utilize the private data in cmdq_pkt to
> generate GCE instructions when needed. Additionally, having
> cmdq_mbox_priv makes it easier to expand and reference other GCE
> private data in the future.
> 
> Add cmdq_get_mbox_priv() for CMDQ users to get all the private data
> into the cmdq_mbox_priv of the cmdq_pkt.
> 
> Fixes: 0858fde496f8 ("mailbox: cmdq: variablize address shift in
> platform")
> Signed-off-by: Jason-JH Lin <jason-jh.lin@...iatek.com>
> ---
>  drivers/mailbox/mtk-cmdq-mailbox.c       |  6 +++---
>  include/linux/mailbox/mtk-cmdq-mailbox.h | 18 ++++++++++++------
>  2 files changed, 15 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c
> b/drivers/mailbox/mtk-cmdq-mailbox.c
> index a3d94f1eb1a3..b18808855680 100644
> --- a/drivers/mailbox/mtk-cmdq-mailbox.c
> +++ b/drivers/mailbox/mtk-cmdq-mailbox.c
> @@ -102,13 +102,13 @@ static inline dma_addr_t
> cmdq_reg_revert_addr(u32 addr, const struct gce_plat *p
>  	return ((dma_addr_t)addr << pdata->shift);
>  }
>  
> -u8 cmdq_get_shift_pa(struct mbox_chan *chan)
> +void cmdq_get_mbox_priv(struct mbox_chan *chan, struct
> cmdq_mbox_priv *priv)
>  {
>  	struct cmdq *cmdq = container_of(chan->mbox, struct cmdq,
> mbox);
>  
> -	return cmdq->pdata->shift;
> +	priv->shift_pa = cmdq->pdata->shift;
>  }
> -EXPORT_SYMBOL(cmdq_get_shift_pa);
> +EXPORT_SYMBOL(cmdq_get_mbox_priv);
>  
>  static void cmdq_gctl_value_toggle(struct cmdq *cmdq, bool
> ddr_enable)
>  {
> diff --git a/include/linux/mailbox/mtk-cmdq-mailbox.h
> b/include/linux/mailbox/mtk-cmdq-mailbox.h
> index e1555e06e7e5..822958f92135 100644
> --- a/include/linux/mailbox/mtk-cmdq-mailbox.h
> +++ b/include/linux/mailbox/mtk-cmdq-mailbox.h
> @@ -70,23 +70,29 @@ struct cmdq_cb_data {
>  	struct cmdq_pkt		*pkt;
>  };
>  
> +struct cmdq_mbox_priv {
> +	u8 shift_pa;
> +};
> +
>  struct cmdq_pkt {
>  	void			*va_base;
>  	dma_addr_t		pa_base;
>  	size_t			cmd_buf_size; /* command occupied
> size */
>  	size_t			buf_size; /* real buffer size */
> +	struct cmdq_mbox_priv	priv; /* for generating instruction
> */
>  };
>  
>  /**
> - * cmdq_get_shift_pa() - get the shift bits of physical address
> + * cmdq_get_mbox_priv() - get the private data of mailbox channel
>   * @chan: mailbox channel
> + * @priv: pointer to store the private data of mailbox channel
>   *
> - * GCE can only fetch the command buffer address from a 32-bit
> register.
> - * Some SOCs support more than 32-bit command buffer address for
> GCE, which
> - * requires some shift bits to make the address fit into the 32-bit
> register.
> + * While generating the GCE instruction to command buffer, the
> private data
> + * of GCE hardware may need to be referenced, such as the shift bits
> of
> + * physical address.
>   *
> - * Return: the shift bits of physical address
> + * This function should be called before generating the GCE
> instruction.
>   */
> -u8 cmdq_get_shift_pa(struct mbox_chan *chan);

Sorry, I realize that I cannot remove this API directly.

I need to remove it after no one using it, which means [PATCH v5 8/19].
I'll fix this in the next version.

Regards,
Jason-JH Lin

> +void cmdq_get_mbox_priv(struct mbox_chan *chan, struct
> cmdq_mbox_priv *priv);
>  
>  #endif /* __MTK_CMDQ_MAILBOX_H__ */