linux-kernel - Re: [PATCH 4/9] soc: mediatek: cmdq: Add cmdq_pkt

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Message-ID: <830cde86af0df89f3331ff89e2b04e51f27cfd1c.camel@mediatek.com>
Date: Fri, 16 Feb 2024 01:39:35 +0000
From: CK Hu (胡俊光) <ck.hu@...iatek.com>
To: "linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
	"chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>, "mchehab@...nel.org"
	<mchehab@...nel.org>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "matthias.bgg@...il.com"
	<matthias.bgg@...il.com>, "angelogioacchino.delregno@...labora.com"
	<angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH 4/9] soc: mediatek: cmdq: Add cmdq_pkt_nop() helper
 function

Hi, Angelo:

On Thu, 2024-02-15 at 11:40 +0100, AngeloGioacchino Del Regno wrote:
> Il 15/02/24 01:49, Chun-Kuang Hu ha scritto:
> > cmdq_pkt_nop() append nop command to the packet. nop command ask
> > GCE to do no operation.
> > 
> > Signed-off-by: Chun-Kuang Hu <chunkuang.hu@...nel.org>
> > ---
> >   drivers/soc/mediatek/mtk-cmdq-helper.c | 11 +++++++++++
> >   include/linux/soc/mediatek/mtk-cmdq.h  | 16 ++++++++++++++++
> >   2 files changed, 27 insertions(+)
> > 
> > diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c
> > b/drivers/soc/mediatek/mtk-cmdq-helper.c
> > index e982997117c2..1be950b4ec7f 100644
> > --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> > +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> > @@ -369,6 +369,17 @@ int cmdq_pkt_eoc(struct cmdq_pkt *pkt)
> >   }
> >   EXPORT_SYMBOL(cmdq_pkt_eoc);
> >   
> > +int cmdq_pkt_nop(struct cmdq_pkt *pkt, u8 shift_pa)
> > +{
> > +	struct cmdq_instruction inst = { {0} };
> > +
> > +	/* Jumping to next instruction is equal to no operation */
> > +	inst.op = CMDQ_CODE_JUMP;
> > +	inst.value = CMDQ_INST_SIZE >> shift_pa;
> > +	return cmdq_pkt_append_command(pkt, inst);
> > +}
> > +EXPORT_SYMBOL(cmdq_pkt_nop);
> > +
> >   int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
> >   {
> >   	struct cmdq_instruction inst = { {0} };
> > diff --git a/include/linux/soc/mediatek/mtk-cmdq.h
> > b/include/linux/soc/mediatek/mtk-cmdq.h
> > index a67f719dec0b..8179ba5238f9 100644
> > --- a/include/linux/soc/mediatek/mtk-cmdq.h
> > +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> > @@ -255,6 +255,17 @@ int cmdq_pkt_jump(struct cmdq_pkt *pkt,
> > dma_addr_t addr, u8 shift_pa);
> >    */
> >   int cmdq_pkt_eoc(struct cmdq_pkt *pkt);
> >   
> > +/**
> > + * cmdq_pkt_nop() - Append nop command to the CMDQ packet, ask GCE
> > + *		    to do no operation.
> 
>   * cmdq_pkt_nop() - Append No-Operation (NOP) command to a CMDQ
> packet
> 
> After which...
> Reviewed-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@...labora.com>
> 
> 

Because I would create cmdq_pkt_jump_abs(), I think cmdq_pkt_nop() is a
special case of cmdq_pkt_jump_rel(), so I would change cmdq_pkt_nop()
to cmdq_pkt_jump_rel() for general use.

Regards,
CK

>