* [RESEND PATCH] media: camss: vfe: Use trace_printk for debugging only
@ 2020-07-10 6:47 Nicolas Boichat
2020-08-18 8:19 ` Nicolas Boichat
0 siblings, 1 reply; 2+ messages in thread
From: Nicolas Boichat @ 2020-07-10 6:47 UTC (permalink / raw)
To: Andy Gross
Cc: Nicolas Boichat, Bjorn Andersson, Mauro Carvalho Chehab,
Todor Tomov, linux-arm-msm, linux-kernel, linux-media
trace_printk should not be used in production code. Since
tracing interrupts is presumably latency sensitive, pr_dbg is
not appropriate, so guard the call with a preprocessor symbol
that can be defined for debugging purpose.
Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
---
Sent this before as part of a series (whose 4th patch was a
change that allows to detect such trace_printk), but maybe it's
easier to get individual maintainer attention by splitting it.
drivers/media/platform/qcom/camss/camss-vfe-4-1.c | 2 ++
drivers/media/platform/qcom/camss/camss-vfe-4-7.c | 2 ++
2 files changed, 4 insertions(+)
diff --git a/drivers/media/platform/qcom/camss/camss-vfe-4-1.c b/drivers/media/platform/qcom/camss/camss-vfe-4-1.c
index 174a36be6f5d866..0c57171fae4f9e9 100644
--- a/drivers/media/platform/qcom/camss/camss-vfe-4-1.c
+++ b/drivers/media/platform/qcom/camss/camss-vfe-4-1.c
@@ -936,8 +936,10 @@ static irqreturn_t vfe_isr(int irq, void *dev)
vfe->ops->isr_read(vfe, &value0, &value1);
+#ifdef CAMSS_VFE_TRACE_IRQ
trace_printk("VFE: status0 = 0x%08x, status1 = 0x%08x\n",
value0, value1);
+#endif
if (value0 & VFE_0_IRQ_STATUS_0_RESET_ACK)
vfe->isr_ops.reset_ack(vfe);
diff --git a/drivers/media/platform/qcom/camss/camss-vfe-4-7.c b/drivers/media/platform/qcom/camss/camss-vfe-4-7.c
index 0dca8bf9281e774..307675925e5c779 100644
--- a/drivers/media/platform/qcom/camss/camss-vfe-4-7.c
+++ b/drivers/media/platform/qcom/camss/camss-vfe-4-7.c
@@ -1058,8 +1058,10 @@ static irqreturn_t vfe_isr(int irq, void *dev)
vfe->ops->isr_read(vfe, &value0, &value1);
+#ifdef CAMSS_VFE_TRACE_IRQ
trace_printk("VFE: status0 = 0x%08x, status1 = 0x%08x\n",
value0, value1);
+#endif
if (value0 & VFE_0_IRQ_STATUS_0_RESET_ACK)
vfe->isr_ops.reset_ack(vfe);
--
2.27.0.383.g050319c2ae-goog
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [RESEND PATCH] media: camss: vfe: Use trace_printk for debugging only
2020-07-10 6:47 [RESEND PATCH] media: camss: vfe: Use trace_printk for debugging only Nicolas Boichat
@ 2020-08-18 8:19 ` Nicolas Boichat
0 siblings, 0 replies; 2+ messages in thread
From: Nicolas Boichat @ 2020-08-18 8:19 UTC (permalink / raw)
To: Andy Gross
Cc: Bjorn Andersson, Mauro Carvalho Chehab, Todor Tomov,
linux-arm-msm, lkml, Linux Media Mailing List
On Fri, Jul 10, 2020 at 2:48 PM Nicolas Boichat <drinkcat@chromium.org> wrote:
>
> trace_printk should not be used in production code. Since
> tracing interrupts is presumably latency sensitive, pr_dbg is
> not appropriate, so guard the call with a preprocessor symbol
> that can be defined for debugging purpose.
>
> Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
> ---
> Sent this before as part of a series (whose 4th patch was a
> change that allows to detect such trace_printk), but maybe it's
> easier to get individual maintainer attention by splitting it.
Mauro, can I get your attention on this patch? This still applies on
the latest 5.9-rc1/linux-next.
Thanks!
>
> drivers/media/platform/qcom/camss/camss-vfe-4-1.c | 2 ++
> drivers/media/platform/qcom/camss/camss-vfe-4-7.c | 2 ++
> 2 files changed, 4 insertions(+)
>
> diff --git a/drivers/media/platform/qcom/camss/camss-vfe-4-1.c b/drivers/media/platform/qcom/camss/camss-vfe-4-1.c
> index 174a36be6f5d866..0c57171fae4f9e9 100644
> --- a/drivers/media/platform/qcom/camss/camss-vfe-4-1.c
> +++ b/drivers/media/platform/qcom/camss/camss-vfe-4-1.c
> @@ -936,8 +936,10 @@ static irqreturn_t vfe_isr(int irq, void *dev)
>
> vfe->ops->isr_read(vfe, &value0, &value1);
>
> +#ifdef CAMSS_VFE_TRACE_IRQ
> trace_printk("VFE: status0 = 0x%08x, status1 = 0x%08x\n",
> value0, value1);
> +#endif
>
> if (value0 & VFE_0_IRQ_STATUS_0_RESET_ACK)
> vfe->isr_ops.reset_ack(vfe);
> diff --git a/drivers/media/platform/qcom/camss/camss-vfe-4-7.c b/drivers/media/platform/qcom/camss/camss-vfe-4-7.c
> index 0dca8bf9281e774..307675925e5c779 100644
> --- a/drivers/media/platform/qcom/camss/camss-vfe-4-7.c
> +++ b/drivers/media/platform/qcom/camss/camss-vfe-4-7.c
> @@ -1058,8 +1058,10 @@ static irqreturn_t vfe_isr(int irq, void *dev)
>
> vfe->ops->isr_read(vfe, &value0, &value1);
>
> +#ifdef CAMSS_VFE_TRACE_IRQ
> trace_printk("VFE: status0 = 0x%08x, status1 = 0x%08x\n",
> value0, value1);
> +#endif
>
> if (value0 & VFE_0_IRQ_STATUS_0_RESET_ACK)
> vfe->isr_ops.reset_ack(vfe);
> --
> 2.27.0.383.g050319c2ae-goog
>
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