Re: [PATCH v5 09/13] soc: mediatek: cmdq: add write_s value function

Dennis-YC Hsieh
2020-05-24T17:31:19Z

Hi Matthias,

Thanks for your comment.

On Sat, 2020-05-16 at 20:20 +0200, Matthias Brugger wrote:
>
> On 08/03/2020 11:52, Dennis YC Hsieh wrote:
> > add write_s function in cmdq helper functions which
> > writes a constant value to address with large dma
> > access support.
> >
> > Signed-off-by: Dennis YC Hsieh <dennis-yc.hsieh@mediatek.com>
> > Reviewed-by: CK Hu <ck.hu@mediatek.com>
> > ---
> > drivers/soc/mediatek/mtk-cmdq-helper.c | 26 ++++++++++++++++++++++++++
> > include/linux/soc/mediatek/mtk-cmdq.h | 14 ++++++++++++++
> > 2 files changed, 40 insertions(+)
> >
> > diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
> > index 03c129230cd7..a9ebbabb7439 100644
> > --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> > +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> > @@ -269,6 +269,32 @@ int cmdq_pkt_write_s(struct cmdq_pkt *pkt, u16 high_addr_reg_idx,
> > }
> > EXPORT_SYMBOL(cmdq_pkt_write_s);
> >
> > +int cmdq_pkt_write_s_value(struct cmdq_pkt *pkt, u16 high_addr_reg_idx,
> > + u16 addr_low, u32 value, u32 mask)
> > +{
> > + struct cmdq_instruction inst = { {0} };
> > + int err;
> > +
> > + if (mask != U32_MAX) {
> > + inst.op = CMDQ_CODE_MASK;
> > + inst.mask = ~mask;
> > + err = cmdq_pkt_append_command(pkt, inst);
> > + if (err < 0)
> > + return err;
> > +
> > + inst.op = CMDQ_CODE_WRITE_S_MASK;
> > + } else {
> > + inst.op = CMDQ_CODE_WRITE_S;
> > + }
> > +
> > + inst.sop = high_addr_reg_idx;
>
> Writing u16 value in a 5 bit wide variable?

We need only 5 bits in this case. I'll change high_addr_reg_idx
parameter to u8.

>
> > + inst.offset = addr_low;
> > + inst.value = value;
> > +
> > + return cmdq_pkt_append_command(pkt, inst);
> > +}
> > +EXPORT_SYMBOL(cmdq_pkt_write_s_value);
> > +
> > int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16 event)
> > {
> > struct cmdq_instruction inst = { {0} };
> > diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
> > index 01b4184af310..fec292aac83c 100644
> > --- a/include/linux/soc/mediatek/mtk-cmdq.h
> > +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> > @@ -135,6 +135,20 @@ int cmdq_pkt_read_s(struct cmdq_pkt *pkt, u16 high_addr_reg_idx, u16 addr_low,
> > int cmdq_pkt_write_s(struct cmdq_pkt *pkt, u16 high_addr_reg_idx,
> > u16 addr_low, u16 src_reg_idx, u32 mask);
> >
> > +/**
> > + * cmdq_pkt_write_s_value() - append write_s command with mask to the CMDQ
> > + * packet which write value to a physical address
> > + * @pkt: the CMDQ packet
> > + * @high_addr_reg_idx: internal regisger ID which contains high address of pa
>
> register

will fix

Regards,
Dennis

>
> > + * @addr_low: low address of pa
> > + * @value: the specified target value
> > + * @mask: the specified target mask
> > + *
> > + * Return: 0 for success; else the error code is returned
> > + */
> > +int cmdq_pkt_write_s_value(struct cmdq_pkt *pkt, u16 high_addr_reg_idx,
> > + u16 addr_low, u32 value, u32 mask);
> > +
> > /**
> > * cmdq_pkt_wfe() - append wait for event command to the CMDQ packet
> > * @pkt: the CMDQ packet
> >