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[1/4] remoteproc: qcom: q6v5-mss: Use regmap_read_poll_timeout

Message ID 20200117135130.3605-2-sibis@codeaurora.org (mailing list archive)
State Superseded
Headers show
Series Improve general readability of MSS on SC7180 | expand

Commit Message

Sibi Sankar Jan. 17, 2020, 1:51 p.m. UTC 
Replace the loop for HALT_ACK detection with regmap_read_poll_timeout.

Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
---
 drivers/remoteproc/qcom_q6v5_mss.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

Comments

Philipp Zabel Jan. 17, 2020, 2:19 p.m. UTC | #1 
On Fri, 2020-01-17 at 19:21 +0530, Sibi Sankar wrote:
> Replace the loop for HALT_ACK detection with regmap_read_poll_timeout.
> 
> Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
> ---
>  drivers/remoteproc/qcom_q6v5_mss.c | 16 ++++++----------
>  1 file changed, 6 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c
> index 51f451311f5fc..f20b39c6ff0ed 100644
> --- a/drivers/remoteproc/qcom_q6v5_mss.c
> +++ b/drivers/remoteproc/qcom_q6v5_mss.c
> @@ -73,6 +73,7 @@
>  #define NAV_AXI_IDLE_BIT		BIT(2)
>  
>  #define HALT_ACK_TIMEOUT_MS		100
> +#define NAV_HALT_ACK_TIMEOUT_US		200
>  
>  /* QDSP6SS_RESET */
>  #define Q6SS_STOP_CORE			BIT(0)
> @@ -746,7 +747,6 @@ static void q6v5proc_halt_nav_axi_port(struct q6v5 *qproc,
>  				       struct regmap *halt_map,
>  				       u32 offset)
>  {
> -	unsigned long timeout;
>  	unsigned int val;
>  	int ret;
>  
> @@ -760,15 +760,11 @@ static void q6v5proc_halt_nav_axi_port(struct q6v5 *qproc,
>  			   NAV_AXI_HALTREQ_BIT);
>  
>  	/* Wait for halt ack*/
> -	timeout = jiffies + msecs_to_jiffies(HALT_ACK_TIMEOUT_MS);
> -	for (;;) {
> -		ret = regmap_read(halt_map, offset, &val);
> -		if (ret || (val & NAV_AXI_HALTACK_BIT) ||
> -		    time_after(jiffies, timeout))
> -			break;
> -
> -		udelay(5);
> -	}
> +	ret = regmap_read_poll_timeout(halt_map, offset, val,
> +				       (val & NAV_AXI_HALTACK_BIT),
> +				       5, NAV_HALT_ACK_TIMEOUT_US);
> +	if (ret)
> +		dev_err(qproc->dev, "nav halt ack timeout\n");
>  
>  	ret = regmap_read(halt_map, offset, &val);
>  	if (ret || !(val & NAV_AXI_IDLE_BIT))

Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>

regards
Philipp
Bjorn Andersson Jan. 20, 2020, 7:24 p.m. UTC | #2 
On Fri 17 Jan 05:51 PST 2020, Sibi Sankar wrote:

> Replace the loop for HALT_ACK detection with regmap_read_poll_timeout.
> 

Nice, but we should be able to do the same in q6v5proc_halt_axi_port()?

> Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
> ---
>  drivers/remoteproc/qcom_q6v5_mss.c | 16 ++++++----------
>  1 file changed, 6 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c
> index 51f451311f5fc..f20b39c6ff0ed 100644
> --- a/drivers/remoteproc/qcom_q6v5_mss.c
> +++ b/drivers/remoteproc/qcom_q6v5_mss.c
> @@ -73,6 +73,7 @@
>  #define NAV_AXI_IDLE_BIT		BIT(2)
>  
>  #define HALT_ACK_TIMEOUT_MS		100
> +#define NAV_HALT_ACK_TIMEOUT_US		200
>  
>  /* QDSP6SS_RESET */
>  #define Q6SS_STOP_CORE			BIT(0)
> @@ -746,7 +747,6 @@ static void q6v5proc_halt_nav_axi_port(struct q6v5 *qproc,
>  				       struct regmap *halt_map,
>  				       u32 offset)
>  {
> -	unsigned long timeout;
>  	unsigned int val;
>  	int ret;
>  
> @@ -760,15 +760,11 @@ static void q6v5proc_halt_nav_axi_port(struct q6v5 *qproc,
>  			   NAV_AXI_HALTREQ_BIT);
>  
>  	/* Wait for halt ack*/
> -	timeout = jiffies + msecs_to_jiffies(HALT_ACK_TIMEOUT_MS);
> -	for (;;) {
> -		ret = regmap_read(halt_map, offset, &val);
> -		if (ret || (val & NAV_AXI_HALTACK_BIT) ||
> -		    time_after(jiffies, timeout))
> -			break;
> -
> -		udelay(5);
> -	}
> +	ret = regmap_read_poll_timeout(halt_map, offset, val,
> +				       (val & NAV_AXI_HALTACK_BIT),
> +				       5, NAV_HALT_ACK_TIMEOUT_US);
> +	if (ret)
> +		dev_err(qproc->dev, "nav halt ack timeout\n");

Is there a case where this new print adds value beyond the printout we
already have for the case of IDLE_BIT not going high? Can we simply
ignore the return value and skip the print?

Regards,
Bjorn

>  
>  	ret = regmap_read(halt_map, offset, &val);
>  	if (ret || !(val & NAV_AXI_IDLE_BIT))
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
Sibi Sankar Jan. 22, 2020, 6:18 a.m. UTC | #3 
Hey Bjorn,

Thanks for the review!

On 2020-01-21 00:54, Bjorn Andersson wrote:
> On Fri 17 Jan 05:51 PST 2020, Sibi Sankar wrote:
> 
>> Replace the loop for HALT_ACK detection with regmap_read_poll_timeout.

sry missed it, will include it
in the next re-spin

>> 
> 
> Nice, but we should be able to do the same in q6v5proc_halt_axi_port()?
> 
>> Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
>> ---
>>  drivers/remoteproc/qcom_q6v5_mss.c | 16 ++++++----------
>>  1 file changed, 6 insertions(+), 10 deletions(-)
>> 
>> diff --git a/drivers/remoteproc/qcom_q6v5_mss.c 
>> b/drivers/remoteproc/qcom_q6v5_mss.c
>> index 51f451311f5fc..f20b39c6ff0ed 100644
>> --- a/drivers/remoteproc/qcom_q6v5_mss.c
>> +++ b/drivers/remoteproc/qcom_q6v5_mss.c
>> @@ -73,6 +73,7 @@
>>  #define NAV_AXI_IDLE_BIT		BIT(2)
>> 
>>  #define HALT_ACK_TIMEOUT_MS		100
>> +#define NAV_HALT_ACK_TIMEOUT_US		200
>> 
>>  /* QDSP6SS_RESET */
>>  #define Q6SS_STOP_CORE			BIT(0)
>> @@ -746,7 +747,6 @@ static void q6v5proc_halt_nav_axi_port(struct q6v5 
>> *qproc,
>>  				       struct regmap *halt_map,
>>  				       u32 offset)
>>  {
>> -	unsigned long timeout;
>>  	unsigned int val;
>>  	int ret;
>> 
>> @@ -760,15 +760,11 @@ static void q6v5proc_halt_nav_axi_port(struct 
>> q6v5 *qproc,
>>  			   NAV_AXI_HALTREQ_BIT);
>> 
>>  	/* Wait for halt ack*/
>> -	timeout = jiffies + msecs_to_jiffies(HALT_ACK_TIMEOUT_MS);
>> -	for (;;) {
>> -		ret = regmap_read(halt_map, offset, &val);
>> -		if (ret || (val & NAV_AXI_HALTACK_BIT) ||
>> -		    time_after(jiffies, timeout))
>> -			break;
>> -
>> -		udelay(5);
>> -	}
>> +	ret = regmap_read_poll_timeout(halt_map, offset, val,
>> +				       (val & NAV_AXI_HALTACK_BIT),
>> +				       5, NAV_HALT_ACK_TIMEOUT_US);
>> +	if (ret)
>> +		dev_err(qproc->dev, "nav halt ack timeout\n");
> 
> Is there a case where this new print adds value beyond the printout we
> already have for the case of IDLE_BIT not going high? Can we simply
> ignore the return value and skip the print?

yes we can skip the print

> 
> Regards,
> Bjorn
> 
>> 
>>  	ret = regmap_read(halt_map, offset, &val);
>>  	if (ret || !(val & NAV_AXI_IDLE_BIT))
>> --
>> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora 
>> Forum,
>> a Linux Foundation Collaborative Project
diff mbox series

Patch

diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c
index 51f451311f5fc..f20b39c6ff0ed 100644
--- a/drivers/remoteproc/qcom_q6v5_mss.c
+++ b/drivers/remoteproc/qcom_q6v5_mss.c
@@ -73,6 +73,7 @@ 
 #define NAV_AXI_IDLE_BIT		BIT(2)
 
 #define HALT_ACK_TIMEOUT_MS		100
+#define NAV_HALT_ACK_TIMEOUT_US		200
 
 /* QDSP6SS_RESET */
 #define Q6SS_STOP_CORE			BIT(0)
@@ -746,7 +747,6 @@  static void q6v5proc_halt_nav_axi_port(struct q6v5 *qproc,
 				       struct regmap *halt_map,
 				       u32 offset)
 {
-	unsigned long timeout;
 	unsigned int val;
 	int ret;
 
@@ -760,15 +760,11 @@  static void q6v5proc_halt_nav_axi_port(struct q6v5 *qproc,
 			   NAV_AXI_HALTREQ_BIT);
 
 	/* Wait for halt ack*/
-	timeout = jiffies + msecs_to_jiffies(HALT_ACK_TIMEOUT_MS);
-	for (;;) {
-		ret = regmap_read(halt_map, offset, &val);
-		if (ret || (val & NAV_AXI_HALTACK_BIT) ||
-		    time_after(jiffies, timeout))
-			break;
-
-		udelay(5);
-	}
+	ret = regmap_read_poll_timeout(halt_map, offset, val,
+				       (val & NAV_AXI_HALTACK_BIT),
+				       5, NAV_HALT_ACK_TIMEOUT_US);
+	if (ret)
+		dev_err(qproc->dev, "nav halt ack timeout\n");
 
 	ret = regmap_read(halt_map, offset, &val);
 	if (ret || !(val & NAV_AXI_IDLE_BIT))