* [PATCH v4] pwm: bcm-iproc: handle clk_get_rate() return
@ 2020-07-18 4:46 Scott Branden
2020-07-24 15:27 ` Ray Jui
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: Scott Branden @ 2020-07-18 4:46 UTC (permalink / raw)
To: Thierry Reding, Lee Jones
Cc: Uwe Kleine-König, BCM Kernel Feedback, linux-pwm,
linux-kernel, Rayagonda Kokatanur, Scott Branden
From: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
Handle clk_get_rate() returning 0 to avoid possible division by zero.
Fixes: daa5abc41c80 ("pwm: Add support for Broadcom iProc PWM controller")
Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
Signed-off-by: Scott Branden <scott.branden@broadcom.com>
Reviewed-by: Ray Jui <ray.jui@broadcom.com>
---
Changes from v3: fixed typo in commit message: Reviewed-off-by.
Hopefully everything clean now.
Changes from v2: update commit message to remove <= condition
as clk_get_rate only returns value >= 0
---
drivers/pwm/pwm-bcm-iproc.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/pwm/pwm-bcm-iproc.c b/drivers/pwm/pwm-bcm-iproc.c
index 1f829edd8ee7..d392a828fc49 100644
--- a/drivers/pwm/pwm-bcm-iproc.c
+++ b/drivers/pwm/pwm-bcm-iproc.c
@@ -85,8 +85,6 @@ static void iproc_pwmc_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
u64 tmp, multi, rate;
u32 value, prescale;
- rate = clk_get_rate(ip->clk);
-
value = readl(ip->base + IPROC_PWM_CTRL_OFFSET);
if (value & BIT(IPROC_PWM_CTRL_EN_SHIFT(pwm->hwpwm)))
@@ -99,6 +97,13 @@ static void iproc_pwmc_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
else
state->polarity = PWM_POLARITY_INVERSED;
+ rate = clk_get_rate(ip->clk);
+ if (rate == 0) {
+ state->period = 0;
+ state->duty_cycle = 0;
+ return;
+ }
+
value = readl(ip->base + IPROC_PWM_PRESCALE_OFFSET);
prescale = value >> IPROC_PWM_PRESCALE_SHIFT(pwm->hwpwm);
prescale &= IPROC_PWM_PRESCALE_MAX;
--
2.17.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH v4] pwm: bcm-iproc: handle clk_get_rate() return
2020-07-18 4:46 [PATCH v4] pwm: bcm-iproc: handle clk_get_rate() return Scott Branden
@ 2020-07-24 15:27 ` Ray Jui
2020-07-24 16:47 ` Uwe Kleine-König
2020-07-27 8:29 ` Thierry Reding
2 siblings, 0 replies; 4+ messages in thread
From: Ray Jui @ 2020-07-24 15:27 UTC (permalink / raw)
To: Scott Branden, Thierry Reding, Lee Jones
Cc: Uwe Kleine-König, BCM Kernel Feedback, linux-pwm,
linux-kernel, Rayagonda Kokatanur
Hi Thierry/Uwe,
Do you have any further comment on this patch? If not, could you please
help to pick it up?
Thanks,
Ray
On 7/17/2020 9:46 PM, Scott Branden wrote:
> From: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
>
> Handle clk_get_rate() returning 0 to avoid possible division by zero.
>
> Fixes: daa5abc41c80 ("pwm: Add support for Broadcom iProc PWM controller")
> Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
> Signed-off-by: Scott Branden <scott.branden@broadcom.com>
> Reviewed-by: Ray Jui <ray.jui@broadcom.com>
>
> ---
> Changes from v3: fixed typo in commit message: Reviewed-off-by.
> Hopefully everything clean now.
> Changes from v2: update commit message to remove <= condition
> as clk_get_rate only returns value >= 0
> ---
> drivers/pwm/pwm-bcm-iproc.c | 9 +++++++--
> 1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pwm/pwm-bcm-iproc.c b/drivers/pwm/pwm-bcm-iproc.c
> index 1f829edd8ee7..d392a828fc49 100644
> --- a/drivers/pwm/pwm-bcm-iproc.c
> +++ b/drivers/pwm/pwm-bcm-iproc.c
> @@ -85,8 +85,6 @@ static void iproc_pwmc_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
> u64 tmp, multi, rate;
> u32 value, prescale;
>
> - rate = clk_get_rate(ip->clk);
> -
> value = readl(ip->base + IPROC_PWM_CTRL_OFFSET);
>
> if (value & BIT(IPROC_PWM_CTRL_EN_SHIFT(pwm->hwpwm)))
> @@ -99,6 +97,13 @@ static void iproc_pwmc_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
> else
> state->polarity = PWM_POLARITY_INVERSED;
>
> + rate = clk_get_rate(ip->clk);
> + if (rate == 0) {
> + state->period = 0;
> + state->duty_cycle = 0;
> + return;
> + }
> +
> value = readl(ip->base + IPROC_PWM_PRESCALE_OFFSET);
> prescale = value >> IPROC_PWM_PRESCALE_SHIFT(pwm->hwpwm);
> prescale &= IPROC_PWM_PRESCALE_MAX;
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH v4] pwm: bcm-iproc: handle clk_get_rate() return
2020-07-18 4:46 [PATCH v4] pwm: bcm-iproc: handle clk_get_rate() return Scott Branden
2020-07-24 15:27 ` Ray Jui
@ 2020-07-24 16:47 ` Uwe Kleine-König
2020-07-27 8:29 ` Thierry Reding
2 siblings, 0 replies; 4+ messages in thread
From: Uwe Kleine-König @ 2020-07-24 16:47 UTC (permalink / raw)
To: Scott Branden
Cc: Thierry Reding, Lee Jones, BCM Kernel Feedback, linux-pwm,
linux-kernel, Rayagonda Kokatanur
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On Fri, Jul 17, 2020 at 09:46:06PM -0700, Scott Branden wrote:
> From: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
>
> Handle clk_get_rate() returning 0 to avoid possible division by zero.
>
> Fixes: daa5abc41c80 ("pwm: Add support for Broadcom iProc PWM controller")
> Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
> Signed-off-by: Scott Branden <scott.branden@broadcom.com>
> Reviewed-by: Ray Jui <ray.jui@broadcom.com>
LGTM
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Best regards
Uwe
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | https://www.pengutronix.de/ |
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH v4] pwm: bcm-iproc: handle clk_get_rate() return
2020-07-18 4:46 [PATCH v4] pwm: bcm-iproc: handle clk_get_rate() return Scott Branden
2020-07-24 15:27 ` Ray Jui
2020-07-24 16:47 ` Uwe Kleine-König
@ 2020-07-27 8:29 ` Thierry Reding
2 siblings, 0 replies; 4+ messages in thread
From: Thierry Reding @ 2020-07-27 8:29 UTC (permalink / raw)
To: Scott Branden
Cc: Lee Jones, Uwe Kleine-König, BCM Kernel Feedback, linux-pwm,
linux-kernel, Rayagonda Kokatanur
[-- Attachment #1: Type: text/plain, Size: 825 bytes --]
On Fri, Jul 17, 2020 at 09:46:06PM -0700, Scott Branden wrote:
> From: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
>
> Handle clk_get_rate() returning 0 to avoid possible division by zero.
>
> Fixes: daa5abc41c80 ("pwm: Add support for Broadcom iProc PWM controller")
> Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
> Signed-off-by: Scott Branden <scott.branden@broadcom.com>
> Reviewed-by: Ray Jui <ray.jui@broadcom.com>
>
> ---
> Changes from v3: fixed typo in commit message: Reviewed-off-by.
> Hopefully everything clean now.
> Changes from v2: update commit message to remove <= condition
> as clk_get_rate only returns value >= 0
> ---
> drivers/pwm/pwm-bcm-iproc.c | 9 +++++++--
> 1 file changed, 7 insertions(+), 2 deletions(-)
Applied, thanks.
Thierry
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^ permalink raw reply [flat|nested] 4+ messages in thread
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2020-07-18 4:46 [PATCH v4] pwm: bcm-iproc: handle clk_get_rate() return Scott Branden
2020-07-24 15:27 ` Ray Jui
2020-07-24 16:47 ` Uwe Kleine-König
2020-07-27 8:29 ` Thierry Reding
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