diff mbox series

[v5,08/12] soc: mediatek: cmdq: define the instruction struct

Message ID 20190507081355.52630-9-bibby.hsieh@mediatek.com
State New, archived
Headers show
Series support gce on mt8183 platform | expand

Commit Message

Bibby Hsieh May 7, 2019, 8:13 a.m. UTC
Define a instruction structure for gce driver to append command.

Signed-off-by: Bibby Hsieh <bibby.hsieh@mediatek.com>
---
 drivers/soc/mediatek/mtk-cmdq-helper.c   | 113 +++++++++++++++--------
 include/linux/mailbox/mtk-cmdq-mailbox.h |   2 +
 include/linux/soc/mediatek/mtk-cmdq.h    |  14 +--
 3 files changed, 84 insertions(+), 45 deletions(-)

Comments

CK Hu May 8, 2019, 5:40 a.m. UTC | #1
Hi, Bibby:

On Tue, 2019-05-07 at 16:13 +0800, Bibby Hsieh wrote:
> Define a instruction structure for gce driver to append command.

I would like you to describe _WHY_ do this. I think you do this for
'code readability'.

> 
> Signed-off-by: Bibby Hsieh <bibby.hsieh@mediatek.com>
> ---
>  drivers/soc/mediatek/mtk-cmdq-helper.c   | 113 +++++++++++++++--------
>  include/linux/mailbox/mtk-cmdq-mailbox.h |   2 +
>  include/linux/soc/mediatek/mtk-cmdq.h    |  14 +--
>  3 files changed, 84 insertions(+), 45 deletions(-)
> 
> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
> index ff9fef5a032b..17ee8196fb3d 100644
> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> @@ -9,12 +9,24 @@
>  #include <linux/mailbox_controller.h>
>  #include <linux/soc/mediatek/mtk-cmdq.h>
>  
> -#define CMDQ_ARG_A_WRITE_MASK	0xffff
>  #define CMDQ_WRITE_ENABLE_MASK	BIT(0)
>  #define CMDQ_EOC_IRQ_EN		BIT(0)
>  #define CMDQ_EOC_CMD		((u64)((CMDQ_CODE_EOC << CMDQ_OP_CODE_SHIFT)) \
>  				<< 32 | CMDQ_EOC_IRQ_EN)
>  
> +struct cmdq_instruction {
> +	union {
> +		u32 value;
> +		u32 mask;
> +	};
> +	union {
> +		u16 offset;
> +		u16 event;
> +	};
> +	u8 subsys;
> +	u8 op;
> +};
> +
>  static void cmdq_client_timeout(struct timer_list *t)
>  {
>  	struct cmdq_client *client = from_timer(client, t, timer);
> @@ -110,10 +122,8 @@ void cmdq_pkt_destroy(struct cmdq_pkt *pkt)
>  }
>  EXPORT_SYMBOL(cmdq_pkt_destroy);
>  
> -static int cmdq_pkt_append_command(struct cmdq_pkt *pkt, enum cmdq_code code,
> -				   u32 arg_a, u32 arg_b)
> +static struct cmdq_instruction *cmdq_pkt_append_command(struct cmdq_pkt *pkt)
>  {
> -	u64 *cmd_ptr;
>  
>  	if (unlikely(pkt->cmd_buf_size + CMDQ_INST_SIZE > pkt->buf_size)) {
>  		/*
> @@ -127,81 +137,108 @@ static int cmdq_pkt_append_command(struct cmdq_pkt *pkt, enum cmdq_code code,
>  		pkt->cmd_buf_size += CMDQ_INST_SIZE;
>  		WARN_ONCE(1, "%s: buffer size %u is too small !\n",
>  			__func__, (u32)pkt->buf_size);
> -		return -ENOMEM;
> +		return NULL;
>  	}
> -	cmd_ptr = pkt->va_base + pkt->cmd_buf_size;
> -	(*cmd_ptr) = (u64)((code << CMDQ_OP_CODE_SHIFT) | arg_a) << 32 | arg_b;
> +
>  	pkt->cmd_buf_size += CMDQ_INST_SIZE;
>  
> -	return 0;
> +	return pkt->va_base + pkt->cmd_buf_size - CMDQ_INST_SIZE;
>  }
>  
> -int cmdq_pkt_write(struct cmdq_pkt *pkt, u32 value, u32 subsys, u32 offset)
> +int cmdq_pkt_write(struct cmdq_pkt *pkt, u8 subsys, u16 offset, u32 value)
>  {
> -	u32 arg_a = (offset & CMDQ_ARG_A_WRITE_MASK) |
> -		    (subsys << CMDQ_SUBSYS_SHIFT);
> +	struct cmdq_instruction *inst;
> +
> +	inst = cmdq_pkt_append_command(pkt);
> +	if (!inst)
> +		return -ENOMEM;
> +
> +	inst->op = CMDQ_CODE_WRITE;
> +	inst->value = value;
> +	inst->offset = offset;
> +	inst->subsys = subsys;
>  
> -	return cmdq_pkt_append_command(pkt, CMDQ_CODE_WRITE, arg_a, value);
> +	return 0;
>  }
>  EXPORT_SYMBOL(cmdq_pkt_write);
>  
> -int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u32 value,
> -			u32 subsys, u32 offset, u32 mask)
> +int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u8 subsys, u16 offset,
> +			u32 value, u32 mask)
>  {
> +	struct cmdq_instruction *inst;
>  	u32 offset_mask = offset;
> -	int err = 0;
>  
>  	if (mask != 0xffffffff) {
> -		err = cmdq_pkt_append_command(pkt, CMDQ_CODE_MASK, 0, ~mask);
> +		inst = cmdq_pkt_append_command(pkt);
> +		if (!inst)
> +			return -ENOMEM;
> +
> +		inst->op = CMDQ_CODE_MASK;
> +		inst->mask = ~mask;
>  		offset_mask |= CMDQ_WRITE_ENABLE_MASK;
>  	}
> -	err |= cmdq_pkt_write(pkt, value, subsys, offset_mask);
>  
> -	return err;
> +	return cmdq_pkt_write(pkt, subsys, offset_mask, value);
>  }
>  EXPORT_SYMBOL(cmdq_pkt_write_mask);
>  
> -int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u32 event)
> +int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16 event)
>  {
> -	u32 arg_b;
> +	struct cmdq_instruction *inst;
>  
>  	if (event >= CMDQ_MAX_EVENT)
>  		return -EINVAL;
>  
> -	/*
> -	 * WFE arg_b
> -	 * bit 0-11: wait value
> -	 * bit 15: 1 - wait, 0 - no wait
> -	 * bit 16-27: update value
> -	 * bit 31: 1 - update, 0 - no update
> -	 */
> -	arg_b = CMDQ_WFE_UPDATE | CMDQ_WFE_WAIT | CMDQ_WFE_WAIT_VALUE;
> +	inst = cmdq_pkt_append_command(pkt);
> +	if (!inst)
> +		return -ENOMEM;
> +
> +	inst->op = CMDQ_CODE_WFE;
> +	inst->value = CMDQ_WFE_OPTION;
> +	inst->event = event;
>  
> -	return cmdq_pkt_append_command(pkt, CMDQ_CODE_WFE, event, arg_b);
> +	return 0;
>  }
>  EXPORT_SYMBOL(cmdq_pkt_wfe);
>  
> -int cmdq_pkt_clear_event(struct cmdq_pkt *pkt, u32 event)
> +int cmdq_pkt_clear_event(struct cmdq_pkt *pkt, u16 event)
>  {
> +	struct cmdq_instruction *inst;
> +
>  	if (event >= CMDQ_MAX_EVENT)
>  		return -EINVAL;
>  
> -	return cmdq_pkt_append_command(pkt, CMDQ_CODE_WFE, event,
> -				       CMDQ_WFE_UPDATE);
> +	inst = cmdq_pkt_append_command(pkt);
> +	if (!inst)
> +		return -ENOMEM;
> +
> +	inst->op = CMDQ_CODE_WFE;
> +	inst->value = CMDQ_WFE_UPDATE;
> +	inst->event = event;
> +
> +	return 0;
>  }
>  EXPORT_SYMBOL(cmdq_pkt_clear_event);
>  
>  static int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
>  {
> -	int err;
> +	struct cmdq_instruction *inst;
> +
> +	inst = cmdq_pkt_append_command(pkt);
> +	if (!inst)
> +		return -ENOMEM;
>  
> -	/* insert EOC and generate IRQ for each command iteration */
> -	err = cmdq_pkt_append_command(pkt, CMDQ_CODE_EOC, 0, CMDQ_EOC_IRQ_EN);
> +	inst->op = CMDQ_CODE_EOC;
> +	inst->value = CMDQ_EOC_IRQ_EN;
>  
> -	/* JUMP to end */
> -	err |= cmdq_pkt_append_command(pkt, CMDQ_CODE_JUMP, 0, CMDQ_JUMP_PASS);
> +	inst = cmdq_pkt_append_command(pkt);
> +	if (!inst)
> +		return -ENOMEM;
> +
> +	inst->op = CMDQ_CODE_JUMP;
> +	inst->value = CMDQ_JUMP_PASS;
>  
> -	return err;
> +	return 0;
>  }
>  
>  static void cmdq_pkt_flush_async_cb(struct cmdq_cb_data data)
> diff --git a/include/linux/mailbox/mtk-cmdq-mailbox.h b/include/linux/mailbox/mtk-cmdq-mailbox.h
> index 911475da7a53..f21801d32a3a 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
> +#define CMDQ_WFE_OPTION                 (CMDQ_WFE_UPDATE | CMDQ_WFE_WAIT | \

Use a 'tab' to replace 8 white space.

> +					CMDQ_WFE_WAIT_VALUE)
>  /** cmdq event maximum */
>  #define CMDQ_MAX_EVENT			0x3ff
>  
> diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
> index 4e8899972db4..52f69c8db8de 100644
> --- a/include/linux/soc/mediatek/mtk-cmdq.h
> +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> @@ -60,26 +60,26 @@ void cmdq_pkt_destroy(struct cmdq_pkt *pkt);
>  /**
>   * cmdq_pkt_write() - append write command to the CMDQ packet
>   * @pkt:	the CMDQ packet
> - * @value:	the specified target register value
>   * @subsys:	the CMDQ sub system code
>   * @offset:	register offset from CMDQ sub system
> + * @value:	the specified target register value
>   *
>   * Return: 0 for success; else the error code is returned
>   */
> -int cmdq_pkt_write(struct cmdq_pkt *pkt, u32 value, u32 subsys, u32 offset);
> +int cmdq_pkt_write(struct cmdq_pkt *pkt, u8 subsys, u16 offset, u32 value);
>  
>  /**
>   * cmdq_pkt_write_mask() - append write command with mask to the CMDQ packet
>   * @pkt:	the CMDQ packet
> - * @value:	the specified target register value
>   * @subsys:	the CMDQ sub system code
>   * @offset:	register offset from CMDQ sub system
> + * @value:	the specified target register value
>   * @mask:	the specified target register mask
>   *
>   * Return: 0 for success; else the error code is returned
>   */
> -int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u32 value,
> -			u32 subsys, u32 offset, u32 mask);
> +int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u8 subsys, u16 offset,
> +			u32 value, u32 mask);

Is the changing of parameter position about 'code readability'?

>  
>  /**
>   * cmdq_pkt_wfe() - append wait for event command to the CMDQ packet
> @@ -88,7 +88,7 @@ int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u32 value,
>   *
>   * Return: 0 for success; else the error code is returned
>   */
> -int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u32 event);
> +int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16 event);

Is the changing from u32 to u16 about 'code readability'?

Regards,
CK
>  
>  /**
>   * cmdq_pkt_clear_event() - append clear event command to the CMDQ packet
> @@ -97,7 +97,7 @@ int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u32 event);
>   *
>   * Return: 0 for success; else the error code is returned
>   */
> -int cmdq_pkt_clear_event(struct cmdq_pkt *pkt, u32 event);
> +int cmdq_pkt_clear_event(struct cmdq_pkt *pkt, u16 event);
>  
>  /**
>   * cmdq_pkt_flush_async() - trigger CMDQ to asynchronously execute the CMDQ
diff mbox series

Patch

diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
index ff9fef5a032b..17ee8196fb3d 100644
--- a/drivers/soc/mediatek/mtk-cmdq-helper.c
+++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
@@ -9,12 +9,24 @@ 
 #include <linux/mailbox_controller.h>
 #include <linux/soc/mediatek/mtk-cmdq.h>
 
-#define CMDQ_ARG_A_WRITE_MASK	0xffff
 #define CMDQ_WRITE_ENABLE_MASK	BIT(0)
 #define CMDQ_EOC_IRQ_EN		BIT(0)
 #define CMDQ_EOC_CMD		((u64)((CMDQ_CODE_EOC << CMDQ_OP_CODE_SHIFT)) \
 				<< 32 | CMDQ_EOC_IRQ_EN)
 
+struct cmdq_instruction {
+	union {
+		u32 value;
+		u32 mask;
+	};
+	union {
+		u16 offset;
+		u16 event;
+	};
+	u8 subsys;
+	u8 op;
+};
+
 static void cmdq_client_timeout(struct timer_list *t)
 {
 	struct cmdq_client *client = from_timer(client, t, timer);
@@ -110,10 +122,8 @@  void cmdq_pkt_destroy(struct cmdq_pkt *pkt)
 }
 EXPORT_SYMBOL(cmdq_pkt_destroy);
 
-static int cmdq_pkt_append_command(struct cmdq_pkt *pkt, enum cmdq_code code,
-				   u32 arg_a, u32 arg_b)
+static struct cmdq_instruction *cmdq_pkt_append_command(struct cmdq_pkt *pkt)
 {
-	u64 *cmd_ptr;
 
 	if (unlikely(pkt->cmd_buf_size + CMDQ_INST_SIZE > pkt->buf_size)) {
 		/*
@@ -127,81 +137,108 @@  static int cmdq_pkt_append_command(struct cmdq_pkt *pkt, enum cmdq_code code,
 		pkt->cmd_buf_size += CMDQ_INST_SIZE;
 		WARN_ONCE(1, "%s: buffer size %u is too small !\n",
 			__func__, (u32)pkt->buf_size);
-		return -ENOMEM;
+		return NULL;
 	}
-	cmd_ptr = pkt->va_base + pkt->cmd_buf_size;
-	(*cmd_ptr) = (u64)((code << CMDQ_OP_CODE_SHIFT) | arg_a) << 32 | arg_b;
+
 	pkt->cmd_buf_size += CMDQ_INST_SIZE;
 
-	return 0;
+	return pkt->va_base + pkt->cmd_buf_size - CMDQ_INST_SIZE;
 }
 
-int cmdq_pkt_write(struct cmdq_pkt *pkt, u32 value, u32 subsys, u32 offset)
+int cmdq_pkt_write(struct cmdq_pkt *pkt, u8 subsys, u16 offset, u32 value)
 {
-	u32 arg_a = (offset & CMDQ_ARG_A_WRITE_MASK) |
-		    (subsys << CMDQ_SUBSYS_SHIFT);
+	struct cmdq_instruction *inst;
+
+	inst = cmdq_pkt_append_command(pkt);
+	if (!inst)
+		return -ENOMEM;
+
+	inst->op = CMDQ_CODE_WRITE;
+	inst->value = value;
+	inst->offset = offset;
+	inst->subsys = subsys;
 
-	return cmdq_pkt_append_command(pkt, CMDQ_CODE_WRITE, arg_a, value);
+	return 0;
 }
 EXPORT_SYMBOL(cmdq_pkt_write);
 
-int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u32 value,
-			u32 subsys, u32 offset, u32 mask)
+int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u8 subsys, u16 offset,
+			u32 value, u32 mask)
 {
+	struct cmdq_instruction *inst;
 	u32 offset_mask = offset;
-	int err = 0;
 
 	if (mask != 0xffffffff) {
-		err = cmdq_pkt_append_command(pkt, CMDQ_CODE_MASK, 0, ~mask);
+		inst = cmdq_pkt_append_command(pkt);
+		if (!inst)
+			return -ENOMEM;
+
+		inst->op = CMDQ_CODE_MASK;
+		inst->mask = ~mask;
 		offset_mask |= CMDQ_WRITE_ENABLE_MASK;
 	}
-	err |= cmdq_pkt_write(pkt, value, subsys, offset_mask);
 
-	return err;
+	return cmdq_pkt_write(pkt, subsys, offset_mask, value);
 }
 EXPORT_SYMBOL(cmdq_pkt_write_mask);
 
-int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u32 event)
+int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16 event)
 {
-	u32 arg_b;
+	struct cmdq_instruction *inst;
 
 	if (event >= CMDQ_MAX_EVENT)
 		return -EINVAL;
 
-	/*
-	 * WFE arg_b
-	 * bit 0-11: wait value
-	 * bit 15: 1 - wait, 0 - no wait
-	 * bit 16-27: update value
-	 * bit 31: 1 - update, 0 - no update
-	 */
-	arg_b = CMDQ_WFE_UPDATE | CMDQ_WFE_WAIT | CMDQ_WFE_WAIT_VALUE;
+	inst = cmdq_pkt_append_command(pkt);
+	if (!inst)
+		return -ENOMEM;
+
+	inst->op = CMDQ_CODE_WFE;
+	inst->value = CMDQ_WFE_OPTION;
+	inst->event = event;
 
-	return cmdq_pkt_append_command(pkt, CMDQ_CODE_WFE, event, arg_b);
+	return 0;
 }
 EXPORT_SYMBOL(cmdq_pkt_wfe);
 
-int cmdq_pkt_clear_event(struct cmdq_pkt *pkt, u32 event)
+int cmdq_pkt_clear_event(struct cmdq_pkt *pkt, u16 event)
 {
+	struct cmdq_instruction *inst;
+
 	if (event >= CMDQ_MAX_EVENT)
 		return -EINVAL;
 
-	return cmdq_pkt_append_command(pkt, CMDQ_CODE_WFE, event,
-				       CMDQ_WFE_UPDATE);
+	inst = cmdq_pkt_append_command(pkt);
+	if (!inst)
+		return -ENOMEM;
+
+	inst->op = CMDQ_CODE_WFE;
+	inst->value = CMDQ_WFE_UPDATE;
+	inst->event = event;
+
+	return 0;
 }
 EXPORT_SYMBOL(cmdq_pkt_clear_event);
 
 static int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
 {
-	int err;
+	struct cmdq_instruction *inst;
+
+	inst = cmdq_pkt_append_command(pkt);
+	if (!inst)
+		return -ENOMEM;
 
-	/* insert EOC and generate IRQ for each command iteration */
-	err = cmdq_pkt_append_command(pkt, CMDQ_CODE_EOC, 0, CMDQ_EOC_IRQ_EN);
+	inst->op = CMDQ_CODE_EOC;
+	inst->value = CMDQ_EOC_IRQ_EN;
 
-	/* JUMP to end */
-	err |= cmdq_pkt_append_command(pkt, CMDQ_CODE_JUMP, 0, CMDQ_JUMP_PASS);
+	inst = cmdq_pkt_append_command(pkt);
+	if (!inst)
+		return -ENOMEM;
+
+	inst->op = CMDQ_CODE_JUMP;
+	inst->value = CMDQ_JUMP_PASS;
 
-	return err;
+	return 0;
 }
 
 static void cmdq_pkt_flush_async_cb(struct cmdq_cb_data data)
diff --git a/include/linux/mailbox/mtk-cmdq-mailbox.h b/include/linux/mailbox/mtk-cmdq-mailbox.h
index 911475da7a53..f21801d32a3a 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
+#define CMDQ_WFE_OPTION                 (CMDQ_WFE_UPDATE | CMDQ_WFE_WAIT | \
+					CMDQ_WFE_WAIT_VALUE)
 /** cmdq event maximum */
 #define CMDQ_MAX_EVENT			0x3ff
 
diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
index 4e8899972db4..52f69c8db8de 100644
--- a/include/linux/soc/mediatek/mtk-cmdq.h
+++ b/include/linux/soc/mediatek/mtk-cmdq.h
@@ -60,26 +60,26 @@  void cmdq_pkt_destroy(struct cmdq_pkt *pkt);
 /**
  * cmdq_pkt_write() - append write command to the CMDQ packet
  * @pkt:	the CMDQ packet
- * @value:	the specified target register value
  * @subsys:	the CMDQ sub system code
  * @offset:	register offset from CMDQ sub system
+ * @value:	the specified target register value
  *
  * Return: 0 for success; else the error code is returned
  */
-int cmdq_pkt_write(struct cmdq_pkt *pkt, u32 value, u32 subsys, u32 offset);
+int cmdq_pkt_write(struct cmdq_pkt *pkt, u8 subsys, u16 offset, u32 value);
 
 /**
  * cmdq_pkt_write_mask() - append write command with mask to the CMDQ packet
  * @pkt:	the CMDQ packet
- * @value:	the specified target register value
  * @subsys:	the CMDQ sub system code
  * @offset:	register offset from CMDQ sub system
+ * @value:	the specified target register value
  * @mask:	the specified target register mask
  *
  * Return: 0 for success; else the error code is returned
  */
-int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u32 value,
-			u32 subsys, u32 offset, u32 mask);
+int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u8 subsys, u16 offset,
+			u32 value, u32 mask);
 
 /**
  * cmdq_pkt_wfe() - append wait for event command to the CMDQ packet
@@ -88,7 +88,7 @@  int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u32 value,
  *
  * Return: 0 for success; else the error code is returned
  */
-int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u32 event);
+int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16 event);
 
 /**
  * cmdq_pkt_clear_event() - append clear event command to the CMDQ packet
@@ -97,7 +97,7 @@  int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u32 event);
  *
  * Return: 0 for success; else the error code is returned
  */
-int cmdq_pkt_clear_event(struct cmdq_pkt *pkt, u32 event);
+int cmdq_pkt_clear_event(struct cmdq_pkt *pkt, u16 event);
 
 /**
  * cmdq_pkt_flush_async() - trigger CMDQ to asynchronously execute the CMDQ