<pre>
Hi, Hsiao-chien:

On Mon, 2023-09-18 at 16:41 +0800, Hsiao Chien Sung wrote:
> Add a new API to jump to the head of cmdq packet by
> appending a jump command at the end of it.
>
> Signed-off-by: Hsiao Chien Sung <shawn.sung@mediatek.com>
> ---
> drivers/soc/mediatek/mtk-cmdq-helper.c | 16 ++++++++++++++++
> include/linux/soc/mediatek/mtk-cmdq.h | 2 ++
> 2 files changed, 18 insertions(+)
>
> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c
> b/drivers/soc/mediatek/mtk-cmdq-helper.c
> index b0cd071c4719..e029ce231df1 100644
> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> @@ -441,4 +441,20 @@ int cmdq_pkt_flush_async(struct cmdq_pkt *pkt)
> }
> EXPORT_SYMBOL(cmdq_pkt_flush_async);
>
> +int cmdq_pkt_jump_absolute(struct cmdq_pkt *pkt)

CMDQ provide ability to jump to any physical address, but this
interface limit the jump to head of packet. So I would like the
interface to be

int cmdq_pkt_jump_absolute(struct cmdq_pkt *pkt, dma_addr_t pa);

For client driver, it could jump to anywhere it want.

Regards,
CK


> +{
> +struct cmdq_instruction inst = { 0 };
> +u8 shift_pa;
> +
> +shift_pa = cmdq_get_shift_pa(((struct cmdq_client *)pkt->cl)-
> >chan);
> +
> +/* jump to head of the packet */
> +inst.op = CMDQ_CODE_JUMP;
> +inst.offset = CMDQ_JUMP_RELATIVE;
> +inst.value = pkt->pa_base >> shift_pa;
> +
> +return cmdq_pkt_append_command(pkt, inst);
> +}
> +EXPORT_SYMBOL(cmdq_pkt_jump_absolute);
> +
> MODULE_LICENSE("GPL v2");
> diff --git a/include/linux/soc/mediatek/mtk-cmdq.h
> b/include/linux/soc/mediatek/mtk-cmdq.h
> index a253c001c861..106988cc5f01 100644
> --- a/include/linux/soc/mediatek/mtk-cmdq.h
> +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> @@ -276,6 +276,8 @@ int cmdq_pkt_jump(struct cmdq_pkt *pkt,
> dma_addr_t addr);
> */
> int cmdq_pkt_finalize(struct cmdq_pkt *pkt);
>
> +int cmdq_pkt_jump_absolute(struct cmdq_pkt *pkt);
> +
> /**
> * cmdq_pkt_flush_async() - trigger CMDQ to asynchronously execute
> the CMDQ
> * packet and call back at the end of done
> packet

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