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Subject[PATCH 14/17] media: atomisp: pci: Remove remaining instance of call to trace_printk
(patch based on intel-aero kernel patch:

Here is the original commit message from the aforementioned patch:

From 26fc9fe5030b63bc9dcf0b5f32981948911ca272 Mon Sep 17 00:00:00 2001
From: Lucas De Marchi <>
Date: Fri, 7 Jul 2017 14:23:53 -0700
Subject: [PATCH] linux-yocto: Remove remaining instance of call to

It's not sufficient to leave trace_printk() out of "normal call chains" since
the way trace infrastructure works is that it will allocate the trace_printk
buffers if the symbol is there (by using a separate section for the function
and checking if __start_* and __stop_* symbols are different.

Therefore, even if the default value for the param tells the module to use
printk(), just the fact that it can be changed to trace_printk() means the
initialization code will be called.

The trace_printk() was replaced by pr_info() on commit 3d81099c75a6
("media: atomisp: Replace trace_printk by pr_info") for the upstreamed
atomisp, too. However, as the aforementioned commit message says, there
is still a remaining instance. This causes the "trace_printk() being
used" kernel warning message to still appear on the first driver load.

Based on the aforementioned patch, this patch removes the call to
ftrace_vprintk(). This removes that kernel warning.

In addition to this, this patch also removes the following now unused

- now empty atomisp_css2_dbg_ftrace_print()
- trace_printk option from dbg_func kernel parameter

Signed-off-by: Tsuchiya Yuto <>
.../staging/media/atomisp/pci/atomisp_compat_css20.c | 10 ----------
drivers/staging/media/atomisp/pci/atomisp_v4l2.c | 4 ++--
2 files changed, 2 insertions(+), 12 deletions(-)

diff --git a/drivers/staging/media/atomisp/pci/atomisp_compat_css20.c b/drivers/staging/media/atomisp/pci/atomisp_compat_css20.c
index 99a632f33d2d..d81d55c6f1fa 100644
--- a/drivers/staging/media/atomisp/pci/atomisp_compat_css20.c
+++ b/drivers/staging/media/atomisp/pci/atomisp_compat_css20.c
@@ -159,13 +159,6 @@ static void atomisp_css2_hw_load(hrt_address addr, void *to, uint32_t n)
spin_unlock_irqrestore(&mmio_lock, flags);

-static int __printf(1, 0) atomisp_css2_dbg_ftrace_print(const char *fmt,
- va_list args)
- ftrace_vprintk(fmt, args);
- return 0;
static int __printf(1, 0) atomisp_vprintk(const char *fmt, va_list args)
vprintk(fmt, args);
@@ -860,9 +853,6 @@ static inline int __set_css_print_env(struct atomisp_device *isp, int opt)
if (opt == 0)
isp->css_env.isp_css_env.print_env.debug_print = NULL;
else if (opt == 1)
- isp->css_env.isp_css_env.print_env.debug_print =
- atomisp_css2_dbg_ftrace_print;
- else if (opt == 2)
isp->css_env.isp_css_env.print_env.debug_print = atomisp_vprintk;
ret = -EINVAL;
diff --git a/drivers/staging/media/atomisp/pci/atomisp_v4l2.c b/drivers/staging/media/atomisp/pci/atomisp_v4l2.c
index f5362554638e..720963156d24 100644
--- a/drivers/staging/media/atomisp/pci/atomisp_v4l2.c
+++ b/drivers/staging/media/atomisp/pci/atomisp_v4l2.c
@@ -87,10 +87,10 @@ module_param(dbg_level, int, 0644);
MODULE_PARM_DESC(dbg_level, "debug message level (default:0)");

/* log function switch */
-int dbg_func = 2;
+int dbg_func = 1;
module_param(dbg_func, int, 0644);
- "log function switch non/trace_printk/printk (default:printk)");
+ "log function switch non/printk (default:printk)");

int mipicsi_flag;
module_param(mipicsi_flag, int, 0644);
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