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Groups > linux.kernel > #1601466 > unrolled thread

[PATCH v4 1/3] mfd: arizona: Remove duplicate set of ret variable

Started byCharles Keepax <ckeepax@opensource.wolfsonmicro.com>
First post2017-03-15 16:00 +0100
Last post2017-03-23 12:00 +0100
Articles 6 — 2 participants

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  [PATCH v4 1/3] mfd: arizona: Remove duplicate set of ret variable Charles Keepax <ckeepax@opensource.wolfsonmicro.com> - 2017-03-15 16:00 +0100
    [PATCH v4 3/3] mfd: arizona: Refactor arizona_poll_reg Charles Keepax <ckeepax@opensource.wolfsonmicro.com> - 2017-03-15 16:00 +0100
      Re: [PATCH v4 3/3] mfd: arizona: Refactor arizona_poll_reg Lee Jones <lee.jones@linaro.org> - 2017-03-23 12:00 +0100
    [PATCH v4 2/3] mfd: arizona: Display register addresses in hex Charles Keepax <ckeepax@opensource.wolfsonmicro.com> - 2017-03-15 16:00 +0100
      Re: [PATCH v4 2/3] mfd: arizona: Display register addresses in hex Lee Jones <lee.jones@linaro.org> - 2017-03-23 12:00 +0100
    Re: [PATCH v4 1/3] mfd: arizona: Remove duplicate set of ret variable Lee Jones <lee.jones@linaro.org> - 2017-03-23 12:00 +0100

#1601466 — [PATCH v4 1/3] mfd: arizona: Remove duplicate set of ret variable

FromCharles Keepax <ckeepax@opensource.wolfsonmicro.com>
Date2017-03-15 16:00 +0100
Subject[PATCH v4 1/3] mfd: arizona: Remove duplicate set of ret variable
Message-ID<tliz7-Cf-1@gated-at.bofh.it>
arizona_poll_reg already returns ETIMEDOUT if we don't see the expected
register changes before the time out, so remove pointless local setting of
ETIMEDOUT.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
---

No changes since v3.

 drivers/mfd/arizona-core.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
index b6d4bc6..e00f577 100644
--- a/drivers/mfd/arizona-core.c
+++ b/drivers/mfd/arizona-core.c
@@ -342,10 +342,8 @@ static int arizona_enable_freerun_sysclk(struct arizona *arizona,
 	ret = arizona_poll_reg(arizona, 25, ARIZONA_INTERRUPT_RAW_STATUS_5,
 			       ARIZONA_FLL1_CLOCK_OK_STS,
 			       ARIZONA_FLL1_CLOCK_OK_STS);
-	if (ret) {
-		ret = -ETIMEDOUT;
+	if (ret)
 		goto err_fll;
-	}
 
 	ret = regmap_write(arizona->regmap, ARIZONA_SYSTEM_CLOCK_1, 0x0144);
 	if (ret) {
@@ -407,11 +405,9 @@ static int wm5102_apply_hardware_patch(struct arizona *arizona)
 
 	ret = arizona_poll_reg(arizona, 5, ARIZONA_WRITE_SEQUENCER_CTRL_1,
 			       ARIZONA_WSEQ_BUSY, 0);
-	if (ret) {
+	if (ret)
 		regmap_write(arizona->regmap, ARIZONA_WRITE_SEQUENCER_CTRL_0,
 			     ARIZONA_WSEQ_ABORT);
-		ret = -ETIMEDOUT;
-	}
 
 err:
 	err = arizona_disable_freerun_sysclk(arizona, &state);
-- 
2.1.4

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#1601468 — [PATCH v4 3/3] mfd: arizona: Refactor arizona_poll_reg

FromCharles Keepax <ckeepax@opensource.wolfsonmicro.com>
Date2017-03-15 16:00 +0100
Subject[PATCH v4 3/3] mfd: arizona: Refactor arizona_poll_reg
Message-ID<tliz7-Cf-7@gated-at.bofh.it>
In reply to#1601466
Currently, we specify the timeout in terms of the number of polls but it
is more clear from a user of the functions perspective to specify the
timeout directly in milliseconds, as such update the function to these new
semantics.

Additionally, arizona_poll_reg essentially hard-codes
regmap_read_poll_timeout, update the implementation to use
regmap_read_poll_timeout. We still keep arizona_poll_reg around as
regmap_read_poll_timeout is a macro so rather than expand this for each
caller keep it wrapped in arizona_poll_reg.

Whilst we are doing this make the timeouts a little more generous as
the previous system had a bit more slack as it was done as a delay per
iteration of the loop whereas regmap_read_poll_timeout compares ktime's.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
---

Changes since v3:
 - Squashed together patches 3/4 from the v3 chain.

Thanks,
Charles

 drivers/mfd/arizona-core.c | 36 ++++++++++++++++--------------------
 1 file changed, 16 insertions(+), 20 deletions(-)

diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
index 4cb34c3..75488e6 100644
--- a/drivers/mfd/arizona-core.c
+++ b/drivers/mfd/arizona-core.c
@@ -235,29 +235,25 @@ static irqreturn_t arizona_overclocked(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
+#define ARIZONA_REG_POLL_DELAY_US 7500
+
 static int arizona_poll_reg(struct arizona *arizona,
-			    int timeout, unsigned int reg,
+			    int timeout_ms, unsigned int reg,
 			    unsigned int mask, unsigned int target)
 {
 	unsigned int val = 0;
-	int ret, i;
-
-	for (i = 0; i < timeout; i++) {
-		ret = regmap_read(arizona->regmap, reg, &val);
-		if (ret != 0) {
-			dev_err(arizona->dev, "Failed to read reg 0x%x: %d\n",
-				reg, ret);
-			continue;
-		}
-
-		if ((val & mask) == target)
-			return 0;
+	int ret;
 
-		usleep_range(1000, 5000);
-	}
+	ret = regmap_read_poll_timeout(arizona->regmap,
+				       ARIZONA_INTERRUPT_RAW_STATUS_5, val,
+				       ((val & mask) == target),
+				       ARIZONA_REG_POLL_DELAY_US,
+				       timeout_ms * 1000);
+	if (ret)
+		dev_err(arizona->dev, "Polling reg 0x%x timed out: %x\n",
+			reg, val);
 
-	dev_err(arizona->dev, "Polling reg 0x%x timed out: %x\n", reg, val);
-	return -ETIMEDOUT;
+	return ret;
 }
 
 static int arizona_wait_for_boot(struct arizona *arizona)
@@ -269,7 +265,7 @@ static int arizona_wait_for_boot(struct arizona *arizona)
 	 * we won't race with the interrupt handler as it'll be blocked on
 	 * runtime resume.
 	 */
-	ret = arizona_poll_reg(arizona, 5, ARIZONA_INTERRUPT_RAW_STATUS_5,
+	ret = arizona_poll_reg(arizona, 30, ARIZONA_INTERRUPT_RAW_STATUS_5,
 			       ARIZONA_BOOT_DONE_STS, ARIZONA_BOOT_DONE_STS);
 
 	if (!ret)
@@ -339,7 +335,7 @@ static int arizona_enable_freerun_sysclk(struct arizona *arizona,
 			ret);
 		return ret;
 	}
-	ret = arizona_poll_reg(arizona, 25, ARIZONA_INTERRUPT_RAW_STATUS_5,
+	ret = arizona_poll_reg(arizona, 180, ARIZONA_INTERRUPT_RAW_STATUS_5,
 			       ARIZONA_FLL1_CLOCK_OK_STS,
 			       ARIZONA_FLL1_CLOCK_OK_STS);
 	if (ret)
@@ -403,7 +399,7 @@ static int wm5102_apply_hardware_patch(struct arizona *arizona)
 		goto err;
 	}
 
-	ret = arizona_poll_reg(arizona, 5, ARIZONA_WRITE_SEQUENCER_CTRL_1,
+	ret = arizona_poll_reg(arizona, 30, ARIZONA_WRITE_SEQUENCER_CTRL_1,
 			       ARIZONA_WSEQ_BUSY, 0);
 	if (ret)
 		regmap_write(arizona->regmap, ARIZONA_WRITE_SEQUENCER_CTRL_0,
-- 
2.1.4

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#1607365 — Re: [PATCH v4 3/3] mfd: arizona: Refactor arizona_poll_reg

FromLee Jones <lee.jones@linaro.org>
Date2017-03-23 12:00 +0100
SubjectRe: [PATCH v4 3/3] mfd: arizona: Refactor arizona_poll_reg
Message-ID<to8Dg-14F-25@gated-at.bofh.it>
In reply to#1601468
On Wed, 15 Mar 2017, Charles Keepax wrote:

> Currently, we specify the timeout in terms of the number of polls but it
> is more clear from a user of the functions perspective to specify the
> timeout directly in milliseconds, as such update the function to these new
> semantics.
> 
> Additionally, arizona_poll_reg essentially hard-codes
> regmap_read_poll_timeout, update the implementation to use
> regmap_read_poll_timeout. We still keep arizona_poll_reg around as
> regmap_read_poll_timeout is a macro so rather than expand this for each
> caller keep it wrapped in arizona_poll_reg.
> 
> Whilst we are doing this make the timeouts a little more generous as
> the previous system had a bit more slack as it was done as a delay per
> iteration of the loop whereas regmap_read_poll_timeout compares ktime's.
> 
> Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
> ---
> 
> Changes since v3:
>  - Squashed together patches 3/4 from the v3 chain.
> 
> Thanks,
> Charles
> 
>  drivers/mfd/arizona-core.c | 36 ++++++++++++++++--------------------
>  1 file changed, 16 insertions(+), 20 deletions(-)

Much better, thanks.

Applied, thanks.

> diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
> index 4cb34c3..75488e6 100644
> --- a/drivers/mfd/arizona-core.c
> +++ b/drivers/mfd/arizona-core.c
> @@ -235,29 +235,25 @@ static irqreturn_t arizona_overclocked(int irq, void *data)
>  	return IRQ_HANDLED;
>  }
>  
> +#define ARIZONA_REG_POLL_DELAY_US 7500
> +
>  static int arizona_poll_reg(struct arizona *arizona,
> -			    int timeout, unsigned int reg,
> +			    int timeout_ms, unsigned int reg,
>  			    unsigned int mask, unsigned int target)
>  {
>  	unsigned int val = 0;
> -	int ret, i;
> -
> -	for (i = 0; i < timeout; i++) {
> -		ret = regmap_read(arizona->regmap, reg, &val);
> -		if (ret != 0) {
> -			dev_err(arizona->dev, "Failed to read reg 0x%x: %d\n",
> -				reg, ret);
> -			continue;
> -		}
> -
> -		if ((val & mask) == target)
> -			return 0;
> +	int ret;
>  
> -		usleep_range(1000, 5000);
> -	}
> +	ret = regmap_read_poll_timeout(arizona->regmap,
> +				       ARIZONA_INTERRUPT_RAW_STATUS_5, val,
> +				       ((val & mask) == target),
> +				       ARIZONA_REG_POLL_DELAY_US,
> +				       timeout_ms * 1000);
> +	if (ret)
> +		dev_err(arizona->dev, "Polling reg 0x%x timed out: %x\n",
> +			reg, val);
>  
> -	dev_err(arizona->dev, "Polling reg 0x%x timed out: %x\n", reg, val);
> -	return -ETIMEDOUT;
> +	return ret;
>  }
>  
>  static int arizona_wait_for_boot(struct arizona *arizona)
> @@ -269,7 +265,7 @@ static int arizona_wait_for_boot(struct arizona *arizona)
>  	 * we won't race with the interrupt handler as it'll be blocked on
>  	 * runtime resume.
>  	 */
> -	ret = arizona_poll_reg(arizona, 5, ARIZONA_INTERRUPT_RAW_STATUS_5,
> +	ret = arizona_poll_reg(arizona, 30, ARIZONA_INTERRUPT_RAW_STATUS_5,
>  			       ARIZONA_BOOT_DONE_STS, ARIZONA_BOOT_DONE_STS);
>  
>  	if (!ret)
> @@ -339,7 +335,7 @@ static int arizona_enable_freerun_sysclk(struct arizona *arizona,
>  			ret);
>  		return ret;
>  	}
> -	ret = arizona_poll_reg(arizona, 25, ARIZONA_INTERRUPT_RAW_STATUS_5,
> +	ret = arizona_poll_reg(arizona, 180, ARIZONA_INTERRUPT_RAW_STATUS_5,
>  			       ARIZONA_FLL1_CLOCK_OK_STS,
>  			       ARIZONA_FLL1_CLOCK_OK_STS);
>  	if (ret)
> @@ -403,7 +399,7 @@ static int wm5102_apply_hardware_patch(struct arizona *arizona)
>  		goto err;
>  	}
>  
> -	ret = arizona_poll_reg(arizona, 5, ARIZONA_WRITE_SEQUENCER_CTRL_1,
> +	ret = arizona_poll_reg(arizona, 30, ARIZONA_WRITE_SEQUENCER_CTRL_1,
>  			       ARIZONA_WSEQ_BUSY, 0);
>  	if (ret)
>  		regmap_write(arizona->regmap, ARIZONA_WRITE_SEQUENCER_CTRL_0,

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

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#1601476 — [PATCH v4 2/3] mfd: arizona: Display register addresses in hex

FromCharles Keepax <ckeepax@opensource.wolfsonmicro.com>
Date2017-03-15 16:00 +0100
Subject[PATCH v4 2/3] mfd: arizona: Display register addresses in hex
Message-ID<tliz8-Cf-35@gated-at.bofh.it>
In reply to#1601466
Register addresses are normally displayed in hex throughout the Arizona
driver. Update the arizona_poll_reg function to follow this convention.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
---

No changes since v4.

 drivers/mfd/arizona-core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
index e00f577..4cb34c3 100644
--- a/drivers/mfd/arizona-core.c
+++ b/drivers/mfd/arizona-core.c
@@ -245,7 +245,7 @@ static int arizona_poll_reg(struct arizona *arizona,
 	for (i = 0; i < timeout; i++) {
 		ret = regmap_read(arizona->regmap, reg, &val);
 		if (ret != 0) {
-			dev_err(arizona->dev, "Failed to read reg %u: %d\n",
+			dev_err(arizona->dev, "Failed to read reg 0x%x: %d\n",
 				reg, ret);
 			continue;
 		}
@@ -256,7 +256,7 @@ static int arizona_poll_reg(struct arizona *arizona,
 		usleep_range(1000, 5000);
 	}
 
-	dev_err(arizona->dev, "Polling reg %u timed out: %x\n", reg, val);
+	dev_err(arizona->dev, "Polling reg 0x%x timed out: %x\n", reg, val);
 	return -ETIMEDOUT;
 }
 
-- 
2.1.4

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#1607359 — Re: [PATCH v4 2/3] mfd: arizona: Display register addresses in hex

FromLee Jones <lee.jones@linaro.org>
Date2017-03-23 12:00 +0100
SubjectRe: [PATCH v4 2/3] mfd: arizona: Display register addresses in hex
Message-ID<to8Df-14F-11@gated-at.bofh.it>
In reply to#1601476
On Wed, 15 Mar 2017, Charles Keepax wrote:

> Register addresses are normally displayed in hex throughout the Arizona
> driver. Update the arizona_poll_reg function to follow this convention.
> 
> Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
> ---
> 
> No changes since v4.
> 
>  drivers/mfd/arizona-core.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Applied, thanks.

> diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
> index e00f577..4cb34c3 100644
> --- a/drivers/mfd/arizona-core.c
> +++ b/drivers/mfd/arizona-core.c
> @@ -245,7 +245,7 @@ static int arizona_poll_reg(struct arizona *arizona,
>  	for (i = 0; i < timeout; i++) {
>  		ret = regmap_read(arizona->regmap, reg, &val);
>  		if (ret != 0) {
> -			dev_err(arizona->dev, "Failed to read reg %u: %d\n",
> +			dev_err(arizona->dev, "Failed to read reg 0x%x: %d\n",
>  				reg, ret);
>  			continue;
>  		}
> @@ -256,7 +256,7 @@ static int arizona_poll_reg(struct arizona *arizona,
>  		usleep_range(1000, 5000);
>  	}
>  
> -	dev_err(arizona->dev, "Polling reg %u timed out: %x\n", reg, val);
> +	dev_err(arizona->dev, "Polling reg 0x%x timed out: %x\n", reg, val);
>  	return -ETIMEDOUT;
>  }
>  

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

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#1607362

FromLee Jones <lee.jones@linaro.org>
Date2017-03-23 12:00 +0100
Message-ID<to8Df-14F-7@gated-at.bofh.it>
In reply to#1601466
On Wed, 15 Mar 2017, Charles Keepax wrote:

> arizona_poll_reg already returns ETIMEDOUT if we don't see the expected
> register changes before the time out, so remove pointless local setting of
> ETIMEDOUT.
> 
> Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
> ---
> 
> No changes since v3.
> 
>  drivers/mfd/arizona-core.c | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)

Applied, thanks.

> diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
> index b6d4bc6..e00f577 100644
> --- a/drivers/mfd/arizona-core.c
> +++ b/drivers/mfd/arizona-core.c
> @@ -342,10 +342,8 @@ static int arizona_enable_freerun_sysclk(struct arizona *arizona,
>  	ret = arizona_poll_reg(arizona, 25, ARIZONA_INTERRUPT_RAW_STATUS_5,
>  			       ARIZONA_FLL1_CLOCK_OK_STS,
>  			       ARIZONA_FLL1_CLOCK_OK_STS);
> -	if (ret) {
> -		ret = -ETIMEDOUT;
> +	if (ret)
>  		goto err_fll;
> -	}
>  
>  	ret = regmap_write(arizona->regmap, ARIZONA_SYSTEM_CLOCK_1, 0x0144);
>  	if (ret) {
> @@ -407,11 +405,9 @@ static int wm5102_apply_hardware_patch(struct arizona *arizona)
>  
>  	ret = arizona_poll_reg(arizona, 5, ARIZONA_WRITE_SEQUENCER_CTRL_1,
>  			       ARIZONA_WSEQ_BUSY, 0);
> -	if (ret) {
> +	if (ret)
>  		regmap_write(arizona->regmap, ARIZONA_WRITE_SEQUENCER_CTRL_0,
>  			     ARIZONA_WSEQ_ABORT);
> -		ret = -ETIMEDOUT;
> -	}
>  
>  err:
>  	err = arizona_disable_freerun_sysclk(arizona, &state);

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

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