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Date:   Mon, 25 May 2020 01:01:35 +0800
From:   Dennis-YC Hsieh <dennis-yc.hsieh@...iatek.com>
To:     Matthias Brugger <matthias.bgg@...il.com>
CC:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <wsd_upstream@...iatek.com>, <dri-devel@...ts.freedesktop.org>,
        Bibby Hsieh <bibby.hsieh@...iatek.com>,
        CK Hu <ck.hu@...iatek.com>,
        Houlong Wei <houlong.wei@...iatek.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        HS Liao <hs.liao@...iatek.com>
Subject: Re: [PATCH v5 06/13] soc: mediatek: cmdq: add assign function

Hi Matthias,

Thanks for your comment.

On Sat, 2020-05-16 at 19:59 +0200, Matthias Brugger wrote:
> 
> On 08/03/2020 11:52, Dennis YC Hsieh wrote:
> > Add assign function in cmdq helper which assign constant value into
> > internal register by index.
> > 
> > Signed-off-by: Dennis YC Hsieh <dennis-yc.hsieh@...iatek.com>
> > Reviewed-by: CK Hu <ck.hu@...iatek.com>
> > ---
> >  drivers/soc/mediatek/mtk-cmdq-helper.c   | 24 +++++++++++++++++++++++-
> >  include/linux/mailbox/mtk-cmdq-mailbox.h |  1 +
> >  include/linux/soc/mediatek/mtk-cmdq.h    | 14 ++++++++++++++
> >  3 files changed, 38 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
> > index 98f23ba3ba47..33153d17c9d9 100644
> > --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> > +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> > @@ -12,6 +12,7 @@
> >  #define CMDQ_WRITE_ENABLE_MASK	BIT(0)
> >  #define CMDQ_POLL_ENABLE_MASK	BIT(0)
> >  #define CMDQ_EOC_IRQ_EN		BIT(0)
> > +#define CMDQ_REG_TYPE		1
> >  
> >  struct cmdq_instruction {
> >  	union {
> > @@ -21,8 +22,17 @@ struct cmdq_instruction {
> >  	union {
> >  		u16 offset;
> >  		u16 event;
> > +		u16 reg_dst;
> > +	};
> > +	union {
> > +		u8 subsys;
> > +		struct {
> > +			u8 sop:5;
> > +			u8 arg_c_t:1;
> > +			u8 arg_b_t:1;
> > +			u8 dst_t:1;
> > +		};
> 
> This union seems without context in this patch. Please drop.
> 

The dst_t use in cmdq_pkt_assign function so how about merge other
variables to reserved and leave dst_t ?

struct {
	u8 reserved_t:7;
	u8 dst_t:1;
};


Regards,
Dennis


> Regards,
> Matthias
> 
> >  	};
> > -	u8 subsys;
> >  	u8 op;
> >  };
> >  
> > @@ -277,6 +287,18 @@ int cmdq_pkt_poll_mask(struct cmdq_pkt *pkt, u8 subsys,
> >  }
> >  EXPORT_SYMBOL(cmdq_pkt_poll_mask);
> >  
> > +int cmdq_pkt_assign(struct cmdq_pkt *pkt, u16 reg_idx, u32 value)
> > +{
> > +	struct cmdq_instruction inst = { {0} };
> > +
> > +	inst.op = CMDQ_CODE_LOGIC;
> > +	inst.dst_t = CMDQ_REG_TYPE;
> > +	inst.reg_dst = reg_idx;
> > +	inst.value = value;
> > +	return cmdq_pkt_append_command(pkt, inst);
> > +}
> > +EXPORT_SYMBOL(cmdq_pkt_assign);
> > +
> >  static int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
> >  {
> >  	struct cmdq_instruction inst = { {0} };
> > diff --git a/include/linux/mailbox/mtk-cmdq-mailbox.h b/include/linux/mailbox/mtk-cmdq-mailbox.h
> > index dfe5b2eb85cc..121c3bb6d3de 100644
> > --- a/include/linux/mailbox/mtk-cmdq-mailbox.h
> > +++ b/include/linux/mailbox/mtk-cmdq-mailbox.h
> > @@ -59,6 +59,7 @@ enum cmdq_code {
> >  	CMDQ_CODE_JUMP = 0x10,
> >  	CMDQ_CODE_WFE = 0x20,
> >  	CMDQ_CODE_EOC = 0x40,
> > +	CMDQ_CODE_LOGIC = 0xa0,
> >  };
> >  
> >  enum cmdq_cb_status {
> > diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
> > index a74c1d5acdf3..83340211e1d3 100644
> > --- a/include/linux/soc/mediatek/mtk-cmdq.h
> > +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> > @@ -152,6 +152,20 @@ int cmdq_pkt_poll(struct cmdq_pkt *pkt, u8 subsys,
> >   */
> >  int cmdq_pkt_poll_mask(struct cmdq_pkt *pkt, u8 subsys,
> >  		       u16 offset, u32 value, u32 mask);
> > +
> > +/**
> > + * cmdq_pkt_assign() - Append logic assign command to the CMDQ packet, ask GCE
> > + *		       to execute an instruction that set a constant value into
> > + *		       internal register and use as value, mask or address in
> > + *		       read/write instruction.
> > + * @pkt:	the CMDQ packet
> > + * @reg_idx:	the CMDQ internal register ID
> > + * @value:	the specified value
> > + *
> > + * Return: 0 for success; else the error code is returned
> > + */
> > +int cmdq_pkt_assign(struct cmdq_pkt *pkt, u16 reg_idx, u32 value);
> > +
> >  /**
> >   * 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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