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

[Matthias Brugger]

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@xxxxxxxxxxxx>
> Reviewed-by: CK Hu <ck.hu@xxxxxxxxxxxx>
> ---
>  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?

> +	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

> + * @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
>