Hi Matthias,
thanks for your comment.
On Mon, 2020-06-22 at 13:07 +0200, Matthias Brugger wrote:
>
> On 21/06/2020 16:18, Dennis YC Hsieh wrote:
> > add write_s function in cmdq helper functions which
> > writes value contains in internal register to address
> > with large dma access support.
> >
> > Signed-off-by: Dennis YC Hsieh <dennis-yc.hsieh@xxxxxxxxxxxx>
> > ---
> > drivers/soc/mediatek/mtk-cmdq-helper.c | 19 +++++++++++++++++++
> > include/linux/mailbox/mtk-cmdq-mailbox.h | 1 +
> > include/linux/soc/mediatek/mtk-cmdq.h | 19 +++++++++++++++++++
> > 3 files changed, 39 insertions(+)
> >
> > diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
> > index bf32e3b2ca6c..817a5a97dbe5 100644
> > --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> > +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> > @@ -18,6 +18,10 @@ struct cmdq_instruction {
> > union {
> > u32 value;
> > u32 mask;
> > + struct {
> > + u16 arg_c;
> > + u16 src_reg;
> > + };
> > };
> > union {
> > u16 offset;
> > @@ -222,6 +226,21 @@ int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u8 subsys,
> > }
> > EXPORT_SYMBOL(cmdq_pkt_write_mask);
> >
> > +int cmdq_pkt_write_s(struct cmdq_pkt *pkt, u16 high_addr_reg_idx,
> > + u16 addr_low, u16 src_reg_idx)
> > +{
>
> Do I understand correctly that we use CMDQ_ADDR_HIGH(addr) and
> CMDQ_ADDR_LOW(addr) to calculate in the client high_addr_reg_idx and addr_low
> respectively?
>
> In that case I think a better interface would be to pass the address and do the
> high/low calculation in the cmdq_pkt_write_s
Not exactly. The high_addr_reg_idx parameter is index of internal
register (which store address bit[47:16]), not result of
CMDQ_ADDR_HIGH(addr).
The CMDQ_ADDR_HIGH macro use in patch 02/11 cmdq_pkt_assign() api. This
api helps assign address bit[47:16] into one of internal register by
index. And same index could be use in cmdq_pkt_write_s(). The gce
combine bit[47:16] in internal register and bit[15:0] in addr_low
parameter to final address. So it is better to keep interface in this
way.
Regards,
Dennis
>
> Regards,
> Matthias
>
> > + struct cmdq_instruction inst = {};
> > +
> > + inst.op = CMDQ_CODE_WRITE_S;
> > + inst.src_t = CMDQ_REG_TYPE;
> > + inst.sop = high_addr_reg_idx;
> > + inst.offset = addr_low;
> > + inst.src_reg = src_reg_idx;
> > +
> > + return cmdq_pkt_append_command(pkt, inst);
> > +}
> > +EXPORT_SYMBOL(cmdq_pkt_write_s);
> > +
> > int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16 event)
> > {
> > struct cmdq_instruction inst = { {0} };
> > diff --git a/include/linux/mailbox/mtk-cmdq-mailbox.h b/include/linux/mailbox/mtk-cmdq-mailbox.h
> > index 121c3bb6d3de..ee67dd3b86f5 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_WRITE_S = 0x90,
> > CMDQ_CODE_LOGIC = 0xa0,
> > };
> >
> > diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
> > index 83340211e1d3..e1c5a7549b4f 100644
> > --- a/include/linux/soc/mediatek/mtk-cmdq.h
> > +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> > @@ -12,6 +12,8 @@
> > #include <linux/timer.h>
> >
> > #define CMDQ_NO_TIMEOUT 0xffffffffu
> > +#define CMDQ_ADDR_HIGH(addr) ((u32)(((addr) >> 16) & GENMASK(31, 0)))
> > +#define CMDQ_ADDR_LOW(addr) ((u16)(addr) | BIT(1))
> >
> > struct cmdq_pkt;
> >
> > @@ -103,6 +105,23 @@ int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u8 subsys,
> > u16 offset, u32 value, u32 mask);
> >
> > /**
> > + * cmdq_pkt_write_s() - append write_s command to the CMDQ packet
> > + * @pkt: the CMDQ packet
> > + * @high_addr_reg_idx: internal register ID which contains high address of pa
> > + * @addr_low: low address of pa
> > + * @src_reg_idx: the CMDQ internal register ID which cache source value
> > + *
> > + * Return: 0 for success; else the error code is returned
> > + *
> > + * Support write value to physical address without subsys. Use CMDQ_ADDR_HIGH()
> > + * to get high address and call cmdq_pkt_assign() to assign value into internal
> > + * reg. Also use CMDQ_ADDR_LOW() to get low address for addr_low parameter when
> > + * call to this function.
> > + */
> > +int cmdq_pkt_write_s(struct cmdq_pkt *pkt, u16 high_addr_reg_idx,
> > + u16 addr_low, u16 src_reg_idx);
> > +
> > +/**
> > * cmdq_pkt_wfe() - append wait for event command to the CMDQ packet
> > * @pkt: the CMDQ packet
> > * @event: the desired event type to "wait and CLEAR"
> >
_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/dri-devel
