On Wed, Sep 03, 2025 at 05:44:31PM +0100, Simon Horman wrote:
> On Wed, Sep 03, 2025 at 10:54:28AM +0800, Dong Yibo wrote:
> > Initialize basic mbx function.
> >
> > Signed-off-by: Dong Yibo <dong100@xxxxxxxxx>
>
> ...
>
> > +/**
> > + * mucse_mbx_inc_pf_req - Increase req
> > + * @hw: pointer to the HW structure
> > + *
> > + * mucse_mbx_inc_pf_req read pf_req from hw, then write
> > + * new value back after increase
> > + **/
> > +static void mucse_mbx_inc_pf_req(struct mucse_hw *hw)
> > +{
> > + struct mucse_mbx_info *mbx = &hw->mbx;
> > + u16 req;
> > + u32 v;
> > +
> > + v = mbx_data_rd32(mbx, MBX_PF2FW_COUNTER);
> > + req = (v & GENMASK_U32(15, 0));
>
> nit1: Unnecessary parentheses
> nit2: I would have used FIELD_GET here in conjunction with something like.
>
> #define MBX_PF2FW_COUNTER_MASK GENMASK_U32(15, 0)
>
Got it, maybe update it like this?
req = FIELD_GET(GENMASK_U32(15, 0), v);
> > + req++;
> > + v &= GENMASK_U32(31, 16);
> > + v |= req;
>
> And using FIELD_PREP is probably more succinct here.
>
> Likewise in the following function
>
Got it, maybe update it like this?
req++;
v = (v & ~GENMASK_U32(15, 0)) | FIELD_PREP(GENMASK_U32(15, 0), req);
> > + mbx_data_wr32(mbx, MBX_PF2FW_COUNTER, v);
> > + hw->mbx.stats.msgs_tx++;
> > +}
> > +
> > +/**
> > + * mucse_mbx_inc_pf_ack - Increase ack
> > + * @hw: pointer to the HW structure
> > + *
> > + * mucse_mbx_inc_pf_ack read pf_ack from hw, then write
> > + * new value back after increase
> > + **/
> > +static void mucse_mbx_inc_pf_ack(struct mucse_hw *hw)
> > +{
> > + struct mucse_mbx_info *mbx = &hw->mbx;
> > + u16 ack;
> > + u32 v;
> > +
> > + v = mbx_data_rd32(mbx, MBX_PF2FW_COUNTER);
> > + ack = (v >> 16) & GENMASK_U32(15, 0);
> > + ack++;
> > + v &= GENMASK_U32(15, 0);
> > + v |= (ack << 16);
> > + mbx_data_wr32(mbx, MBX_PF2FW_COUNTER, v);
> > + hw->mbx.stats.msgs_rx++;
> > +}
>
> ...
>
Maybe like this ?
...
v = mbx_data_rd32(mbx, MBX_PF2FW_COUNTER);
ack = FIELD_GET(GENMASK_U32(31, 16), v);
ack++;
v = (v & GENMASK_U32(15, 0)) | FIELD_PREP(GENMASK_U32(31, 16), ack);
mbx_data_wr32(mbx, MBX_PF2FW_COUNTER, v);
...
> > +/**
> > + * mucse_mbx_reset - Reset mbx info, sync info from regs
> > + * @hw: pointer to the HW structure
> > + *
> > + * This function reset all mbx variables to default.
> > + **/
> > +static void mucse_mbx_reset(struct mucse_hw *hw)
> > +{
> > + struct mucse_mbx_info *mbx = &hw->mbx;
> > + u32 v;
> > +
> > + v = mbx_data_rd32(mbx, MBX_FW2PF_COUNTER);
> > + hw->mbx.fw_req = v & GENMASK_U32(15, 0);
> > + hw->mbx.fw_ack = (v >> 16) & GENMASK_U32(15, 0);
>
> I'd use FIELD_GET here too.
>
Maybe like this?
hw->mbx.fw_req = FIELD_GET(GENMASK_U32(15, 0), v);
hw->mbx.fw_ack = FIELD_GET(GENMASK_U32(31, 16), v);
> > + mbx_ctrl_wr32(mbx, PF2FW_MBOX_CTRL(mbx), 0);
> > + mbx_ctrl_wr32(mbx, FW_PF_MBOX_MASK(mbx), GENMASK_U32(31, 16));
> > +}
>
> ...
>
Thanks for your feedback.
