linux-kernel - Re: [PATCH v5 06/13] soc: mediatek: cmdq: add assign function

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Message-ID: <b087eb7c-7b6b-344e-0c50-34b09610e74e@gmail.com>
Date:   Sun, 24 May 2020 20:09:36 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Dennis-YC Hsieh <dennis-yc.hsieh@...iatek.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        wsd_upstream@...iatek.com, dri-devel@...ts.freedesktop.org,
        Bibby Hsieh <bibby.hsieh@...iatek.com>,
        CK Hu <ck.hu@...iatek.com>,
        Houlong Wei <houlong.wei@...iatek.com>,
        linux-arm-kernel@...ts.infradead.org,
        HS Liao <hs.liao@...iatek.com>
Subject: Re: [PATCH v5 06/13] soc: mediatek: cmdq: add assign function



On 24/05/2020 19:01, Dennis-YC Hsieh wrote:
> Hi Matthias,
> 
> Thanks for your comment.
> 
> On Sat, 2020-05-16 at 19:59 +0200, Matthias Brugger wrote:
>>
>> On 08/03/2020 11:52, Dennis YC Hsieh wrote:
>>> Add assign function in cmdq helper which assign constant value into
>>> internal register by index.
>>>
>>> Signed-off-by: Dennis YC Hsieh <dennis-yc.hsieh@...iatek.com>
>>> Reviewed-by: CK Hu <ck.hu@...iatek.com>
>>> ---
>>>  drivers/soc/mediatek/mtk-cmdq-helper.c   | 24 +++++++++++++++++++++++-
>>>  include/linux/mailbox/mtk-cmdq-mailbox.h |  1 +
>>>  include/linux/soc/mediatek/mtk-cmdq.h    | 14 ++++++++++++++
>>>  3 files changed, 38 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
>>> index 98f23ba3ba47..33153d17c9d9 100644
>>> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
>>> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
>>> @@ -12,6 +12,7 @@
>>>  #define CMDQ_WRITE_ENABLE_MASK	BIT(0)
>>>  #define CMDQ_POLL_ENABLE_MASK	BIT(0)
>>>  #define CMDQ_EOC_IRQ_EN		BIT(0)
>>> +#define CMDQ_REG_TYPE		1
>>>  
>>>  struct cmdq_instruction {
>>>  	union {
>>> @@ -21,8 +22,17 @@ struct cmdq_instruction {
>>>  	union {
>>>  		u16 offset;
>>>  		u16 event;
>>> +		u16 reg_dst;
>>> +	};
>>> +	union {
>>> +		u8 subsys;
>>> +		struct {
>>> +			u8 sop:5;
>>> +			u8 arg_c_t:1;
>>> +			u8 arg_b_t:1;
>>> +			u8 dst_t:1;
>>> +		};
>>
>> This union seems without context in this patch. Please drop.
>>
> 
> The dst_t use in cmdq_pkt_assign function so how about merge other

Ah didn't realize this. Then I think it's OK like it is.

Regards,
Matthias

> variables to reserved and leave dst_t ?
> 
> struct {
> 	u8 reserved_t:7;
> 	u8 dst_t:1;
> };
> 
> 
> Regards,
> Dennis
> 
> 
>> Regards,
>> Matthias
>>
>>>  	};
>>> -	u8 subsys;
>>>  	u8 op;
>>>  };
>>>  
>>> @@ -277,6 +287,18 @@ int cmdq_pkt_poll_mask(struct cmdq_pkt *pkt, u8 subsys,
>>>  }
>>>  EXPORT_SYMBOL(cmdq_pkt_poll_mask);
>>>  
>>> +int cmdq_pkt_assign(struct cmdq_pkt *pkt, u16 reg_idx, u32 value)
>>> +{
>>> +	struct cmdq_instruction inst = { {0} };
>>> +
>>> +	inst.op = CMDQ_CODE_LOGIC;
>>> +	inst.dst_t = CMDQ_REG_TYPE;
>>> +	inst.reg_dst = reg_idx;
>>> +	inst.value = value;
>>> +	return cmdq_pkt_append_command(pkt, inst);
>>> +}
>>> +EXPORT_SYMBOL(cmdq_pkt_assign);
>>> +
>>>  static int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
>>>  {
>>>  	struct cmdq_instruction inst = { {0} };
>>> diff --git a/include/linux/mailbox/mtk-cmdq-mailbox.h b/include/linux/mailbox/mtk-cmdq-mailbox.h
>>> index dfe5b2eb85cc..121c3bb6d3de 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_LOGIC = 0xa0,
>>>  };
>>>  
>>>  enum cmdq_cb_status {
>>> diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
>>> index a74c1d5acdf3..83340211e1d3 100644
>>> --- a/include/linux/soc/mediatek/mtk-cmdq.h
>>> +++ b/include/linux/soc/mediatek/mtk-cmdq.h
>>> @@ -152,6 +152,20 @@ int cmdq_pkt_poll(struct cmdq_pkt *pkt, u8 subsys,
>>>   */
>>>  int cmdq_pkt_poll_mask(struct cmdq_pkt *pkt, u8 subsys,
>>>  		       u16 offset, u32 value, u32 mask);
>>> +
>>> +/**
>>> + * cmdq_pkt_assign() - Append logic assign command to the CMDQ packet, ask GCE
>>> + *		       to execute an instruction that set a constant value into
>>> + *		       internal register and use as value, mask or address in
>>> + *		       read/write instruction.
>>> + * @pkt:	the CMDQ packet
>>> + * @reg_idx:	the CMDQ internal register ID
>>> + * @value:	the specified value
>>> + *
>>> + * Return: 0 for success; else the error code is returned
>>> + */
>>> +int cmdq_pkt_assign(struct cmdq_pkt *pkt, u16 reg_idx, u32 value);
>>> +
>>>  /**
>>>   * cmdq_pkt_flush_async() - trigger CMDQ to asynchronously execute the CMDQ
>>>   *                          packet and call back at the end of done packet
>>>
>