linux-kernel - Re: [PATCH v2 09/14] soc: mediatek: cmdq: add read

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Message-ID: <1576114425.17653.11.camel@mtkswgap22>
Date:   Thu, 12 Dec 2019 09:33:45 +0800
From:   Dennis-YC Hsieh <dennis-yc.hsieh@...iatek.com>
To:     CK Hu <ck.hu@...iatek.com>
CC:     Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Jassi Brar <jassisinghbrar@...il.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <wsd_upstream@...iatek.com>,
        Bibby Hsieh <bibby.hsieh@...iatek.com>,
        Houlong Wei <houlong.wei@...iatek.com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 09/14] soc: mediatek: cmdq: add read_s function

Hi CK,

On Tue, 2019-12-10 at 15:55 +0800, CK Hu wrote:
> Hi, Dennis:
> 
> On Wed, 2019-11-27 at 09:58 +0800, Dennis YC Hsieh wrote:
> > Add read_s function in cmdq helper functions which support read value from
> > register or dma physical address into gce internal register.
> > 
> > Signed-off-by: Dennis YC Hsieh <dennis-yc.hsieh@...iatek.com>
> > ---
> >  drivers/soc/mediatek/mtk-cmdq-helper.c   | 20 ++++++++++++++++++++
> >  include/linux/mailbox/mtk-cmdq-mailbox.h |  1 +
> >  include/linux/soc/mediatek/mtk-cmdq.h    | 10 ++++++++++
> >  3 files changed, 31 insertions(+)
> > 
> > diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
> > index 2edbc0954d97..2cd693e34980 100644
> > --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> > +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> > @@ -231,6 +231,26 @@ int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u8 subsys,
> >  }
> >  EXPORT_SYMBOL(cmdq_pkt_write_mask);
> >  
> > +int cmdq_pkt_read_s(struct cmdq_pkt *pkt, phys_addr_t addr, u16 reg_idx)
> > +{
> 
> Should addr be shifted in mt6779?
> 
> Regards,
> CK
> 

no, only pc and end register shift address
no need to shift in instruction


Regards,
Dennis

> > +	struct cmdq_instruction inst = { {0} };
> > +	int err;
> > +	const u16 src_reg_idx = CMDQ_SPR_TEMP;
> > +
> > +	err = cmdq_pkt_assign(pkt, src_reg_idx, CMDQ_ADDR_HIGH(addr));
> > +	if (err < 0)
> > +		return err;
> > +
> > +	inst.op = CMDQ_CODE_READ_S;
> > +	inst.dst_t = CMDQ_REG_TYPE;
> > +	inst.sop = src_reg_idx;
> > +	inst.reg_dst = reg_idx;
> > +	inst.arg_b = CMDQ_ADDR_LOW(addr);
> > +
> > +	return cmdq_pkt_append_command(pkt, inst);
> > +}
> > +EXPORT_SYMBOL(cmdq_pkt_read_s);
> > +
> >  int cmdq_pkt_write_s(struct cmdq_pkt *pkt, phys_addr_t addr, u16 reg_idx,
> >  		     u32 mask)
> >  {
> > diff --git a/include/linux/mailbox/mtk-cmdq-mailbox.h b/include/linux/mailbox/mtk-cmdq-mailbox.h
> > index 8ef87e1bd03b..3f6bc0dfd5da 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_READ_S = 0x80,
> >  	CMDQ_CODE_WRITE_S = 0x90,
> >  	CMDQ_CODE_WRITE_S_MASK = 0x91,
> >  	CMDQ_CODE_LOGIC = 0xa0,
> > diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
> > index 56ff1970197c..bc28a41d7780 100644
> > --- a/include/linux/soc/mediatek/mtk-cmdq.h
> > +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> > @@ -106,6 +106,16 @@ int cmdq_pkt_write(struct cmdq_pkt *pkt, u8 subsys, u16 offset, u32 value);
> >  int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u8 subsys,
> >  			u16 offset, u32 value, u32 mask);
> >  
> > +/**
> > + * cmdq_pkt_read_s() - append read_s command to the CMDQ packet
> > + * @pkt:	the CMDQ packet
> > + * @addr:	the physical address of register or dma to read
> > + * @reg_idx:	the CMDQ internal register ID to cache read data
> > + *
> > + * Return: 0 for success; else the error code is returned
> > + */
> > +int cmdq_pkt_read_s(struct cmdq_pkt *pkt, phys_addr_t addr, u16 reg_idx);
> > +
> >  /**
> >   * cmdq_pkt_write_s_mask() - append write_s command to the CMDQ packet
> >   * @pkt:	the CMDQ packet
> 
>