linux-kernel - Re: [RESEND, PATCH v13 06/12] soc: mediatek: cmdq: clear the event in cmdq initial flow

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Date:   Fri, 23 Aug 2019 13:43:54 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Bibby Hsieh <bibby.hsieh@...iatek.com>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Rob Herring <robh+dt@...nel.org>, CK HU <ck.hu@...iatek.com>
Cc:     Daniel Kurtz <djkurtz@...omium.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, srv_heupstream@...iatek.com,
        Sascha Hauer <kernel@...gutronix.de>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Nicolas Boichat <drinkcat@...omium.org>,
        YT Shen <yt.shen@...iatek.com>,
        Daoyuan Huang <daoyuan.huang@...iatek.com>,
        Jiaguang Zhang <jiaguang.zhang@...iatek.com>,
        Dennis-YC Hsieh <dennis-yc.hsieh@...iatek.com>,
        Houlong Wei <houlong.wei@...iatek.com>, ginny.chen@...iatek.com
Subject: Re: [RESEND, PATCH v13 06/12] soc: mediatek: cmdq: clear the event in
 cmdq initial flow



On 23/08/2019 13:36, Matthias Brugger wrote:
> 
> 
> On 20/08/2019 10:49, Bibby Hsieh wrote:
>> GCE hardware stored event information in own internal sysram,
>> if the initial value in those sysram is not zero value
>> it will cause a situation that gce can wait the event immediately
>> after client ask gce to wait event but not really trigger the
>> corresponding hardware.
>>
>> In order to make sure that the wait event function is
>> exactly correct, we need to clear the sysram value in
>> cmdq initial flow.
>>
>> Fixes: 623a6143a845 ("mailbox: mediatek: Add Mediatek CMDQ driver")
>>
>> Signed-off-by: Bibby Hsieh <bibby.hsieh@...iatek.com>
>> Reviewed-by: CK Hu <ck.hu@...iatek.com>

I oversaw some things/nits.

Patch subject should be:
mailbox: mediatek: cmdq: clear the event in cmdq initial flow

>> ---
>>  drivers/mailbox/mtk-cmdq-mailbox.c       | 5 +++++
>>  include/linux/mailbox/mtk-cmdq-mailbox.h | 2 ++
>>  include/linux/soc/mediatek/mtk-cmdq.h    | 3 ---
>>  3 files changed, 7 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-mailbox.c
>> index 69daaadc3a5f..9a6ce9f5a7db 100644
>> --- a/drivers/mailbox/mtk-cmdq-mailbox.c
>> +++ b/drivers/mailbox/mtk-cmdq-mailbox.c
>> @@ -21,6 +21,7 @@
>>  #define CMDQ_NUM_CMD(t)			(t->cmd_buf_size / CMDQ_INST_SIZE)
>>  
>>  #define CMDQ_CURR_IRQ_STATUS		0x10
>> +#define CMDQ_SYNC_TOKEN_UPDATE		0x68
>>  #define CMDQ_THR_SLOT_CYCLES		0x30
>>  #define CMDQ_THR_BASE			0x100
>>  #define CMDQ_THR_SIZE			0x80
>> @@ -104,8 +105,12 @@ static void cmdq_thread_resume(struct cmdq_thread *thread)
>>  
>>  static void cmdq_init(struct cmdq *cmdq)
>>  {
>> +	int i;
>> +
>>  	WARN_ON(clk_enable(cmdq->clock) < 0);
>>  	writel(CMDQ_THR_ACTIVE_SLOT_CYCLES, cmdq->base + CMDQ_THR_SLOT_CYCLES);
>> +	for (i = 0; i <= CMDQ_MAX_EVENT; i++)
>> +		writel(i, cmdq->base + CMDQ_SYNC_TOKEN_UPDATE);

I think CMDQ_SYNC_TOKEN_UPDATE is not a good name for the define.
Any reason why we couldn't name it something like CMDQ_SYNC_TOKEN_RESET?


>>  	clk_disable(cmdq->clock);
>>  }
>>  
>> diff --git a/include/linux/mailbox/mtk-cmdq-mailbox.h b/include/linux/mailbox/mtk-cmdq-mailbox.h
>> index ccb73422c2fa..911475da7a53 100644
>> --- a/include/linux/mailbox/mtk-cmdq-mailbox.h
>> +++ b/include/linux/mailbox/mtk-cmdq-mailbox.h
>> @@ -19,6 +19,8 @@
>>  #define CMDQ_WFE_UPDATE			BIT(31)
>>  #define CMDQ_WFE_WAIT			BIT(15)
>>  #define CMDQ_WFE_WAIT_VALUE		0x1
>> +/** cmdq event maximum */

While at it, add a new line before the comment.

Regards,
Matthias

>> +#define CMDQ_MAX_EVENT			0x3ff
>>  
>>  /*
>>   * CMDQ_CODE_MASK:
>> diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
>> index 54ade13a9b15..4e8899972db4 100644
>> --- a/include/linux/soc/mediatek/mtk-cmdq.h
>> +++ b/include/linux/soc/mediatek/mtk-cmdq.h
>> @@ -13,9 +13,6 @@
>>  
>>  #define CMDQ_NO_TIMEOUT		0xffffffffu
>>  
>> -/** cmdq event maximum */
>> -#define CMDQ_MAX_EVENT				0x3ff
>> -
>>  struct cmdq_pkt;
>>  
>>  struct cmdq_client {
>>