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Date: Tue, 10 Apr 2012 14:56:09 +0200
From: Takashi Iwai <tiwai@...e.de>
To: Fengguang Wu <fengguang.wu@...el.com>
Cc: Stephen Warren <swarren@...dotorg.org>,
alsa-devel@...a-project.org,
Nick Bowler <nbowler@...iptictech.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Keith Packard <keithp@...thp.com>
Subject: Re: [PATCH] alsa: hide HDMI/ELD printks unless in debug kernels
At Tue, 10 Apr 2012 17:00:35 +0800,
Fengguang Wu wrote:
>
> On Tue, Apr 10, 2012 at 08:08:56AM +0200, Takashi Iwai wrote:
> > At Mon, 09 Apr 2012 09:12:44 -0600,
> > Stephen Warren wrote:
> > >
> > > On 04/08/2012 08:15 PM, Fengguang Wu wrote:
> > > > These trivial messages will show up repeatedly on hot plug as well as
> > > > video mode changes, which could be annoying.
> > > >
> > > > Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>
> > >
> > > Those messages are very useful for end-users to diagnose problems with
> > > HDMI audio. Is there a way to make the messages dynamic, so users can
> > > get them if they want, without recompiling their kernel?
> >
> > We can define a new macro like below, add call like _snd_printd(2,
> > ....) instead of snd_printd().
> > (Yes, the number 2 can be replaced better in an enum, too.)
> >
> > In future, we should move to the standard dynamic_printk, but a patch
> > like this would be a good compromise for merging to 3.4 kernel, IMO.
>
> OK. How about this?
>
> Subject: alsa: hide HDMI/ELD printks unless snd.debug=2
> Date: Fri Nov 11 19:09:36 CST 2011
Looks good to me. Applied it now.
Thanks!
Takashi
>
> Also remove two warnings when CONFIG_SND_DEBUG is not set:
>
> sound/pci/hda/patch_hdmi.c: In function ‘hdmi_intrinsic_event’:
> sound/pci/hda/patch_hdmi.c:761:6: warning: unused variable ‘eldv’ [-Wunused-variable]
> sound/pci/hda/patch_hdmi.c:760:6: warning: unused variable ‘pd’ [-Wunused-variable]
>
> Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>
> ---
> include/sound/core.h | 10 ++++++++++
> sound/pci/hda/hda_eld.c | 6 +++---
> sound/pci/hda/patch_hdmi.c | 9 ++++-----
> 3 files changed, 17 insertions(+), 8 deletions(-)
>
> --- linux.orig/sound/pci/hda/hda_eld.c 2012-04-10 16:51:00.737707853 +0800
> +++ linux/sound/pci/hda/hda_eld.c 2012-04-10 16:51:08.105708029 +0800
> @@ -418,7 +418,7 @@ static void hdmi_show_short_audio_desc(s
> else
> buf2[0] = '\0';
>
> - printk(KERN_INFO "HDMI: supports coding type %s:"
> + _snd_printd(SND_PR_VERBOSE, "HDMI: supports coding type %s:"
> " channels = %d, rates =%s%s\n",
> cea_audio_coding_type_names[a->format],
> a->channels,
> @@ -442,14 +442,14 @@ void snd_hdmi_show_eld(struct hdmi_eld *
> {
> int i;
>
> - printk(KERN_INFO "HDMI: detected monitor %s at connection type %s\n",
> + _snd_printd(SND_PR_VERBOSE, "HDMI: detected monitor %s at connection type %s\n",
> e->monitor_name,
> eld_connection_type_names[e->conn_type]);
>
> if (e->spk_alloc) {
> char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
> snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf));
> - printk(KERN_INFO "HDMI: available speakers:%s\n", buf);
> + _snd_printd(SND_PR_VERBOSE, "HDMI: available speakers:%s\n", buf);
> }
>
> for (i = 0; i < e->sad_count; i++)
> --- linux.orig/sound/pci/hda/patch_hdmi.c 2012-04-10 16:51:00.745707854 +0800
> +++ linux/sound/pci/hda/patch_hdmi.c 2012-04-10 16:55:35.813714391 +0800
> @@ -757,8 +757,6 @@ static void hdmi_intrinsic_event(struct
> struct hdmi_spec *spec = codec->spec;
> int tag = res >> AC_UNSOL_RES_TAG_SHIFT;
> int pin_nid;
> - int pd = !!(res & AC_UNSOL_RES_PD);
> - int eldv = !!(res & AC_UNSOL_RES_ELDV);
> int pin_idx;
> struct hda_jack_tbl *jack;
>
> @@ -768,9 +766,10 @@ static void hdmi_intrinsic_event(struct
> pin_nid = jack->nid;
> jack->jack_dirty = 1;
>
> - printk(KERN_INFO
> + _snd_printd(SND_PR_VERBOSE,
> "HDMI hot plug event: Codec=%d Pin=%d Presence_Detect=%d ELD_Valid=%d\n",
> - codec->addr, pin_nid, pd, eldv);
> + codec->addr, pin_nid,
> + !!(res & AC_UNSOL_RES_PD), !!(res & AC_UNSOL_RES_ELDV));
>
> pin_idx = pin_nid_to_pin_index(spec, pin_nid);
> if (pin_idx < 0)
> @@ -992,7 +991,7 @@ static void hdmi_present_sense(struct hd
> if (eld->monitor_present)
> eld_valid = !!(present & AC_PINSENSE_ELDV);
>
> - printk(KERN_INFO
> + _snd_printd(SND_PR_VERBOSE,
> "HDMI status: Codec=%d Pin=%d Presence_Detect=%d ELD_Valid=%d\n",
> codec->addr, pin_nid, eld->monitor_present, eld_valid);
>
> --- linux.orig/include/sound/core.h 2012-04-10 16:51:00.757707854 +0800
> +++ linux/include/sound/core.h 2012-04-10 16:51:08.105708029 +0800
> @@ -325,6 +325,13 @@ void release_and_free_resource(struct re
>
> /* --- */
>
> +/* sound printk debug levels */
> +enum {
> + SND_PR_ALWAYS,
> + SND_PR_DEBUG,
> + SND_PR_VERBOSE,
> +};
> +
> #if defined(CONFIG_SND_DEBUG) || defined(CONFIG_SND_VERBOSE_PRINTK)
> __printf(4, 5)
> void __snd_printk(unsigned int level, const char *file, int line,
> @@ -354,6 +361,8 @@ void __snd_printk(unsigned int level, co
> */
> #define snd_printd(fmt, args...) \
> __snd_printk(1, __FILE__, __LINE__, fmt, ##args)
> +#define _snd_printd(level, fmt, args...) \
> + __snd_printk(level, __FILE__, __LINE__, fmt, ##args)
>
> /**
> * snd_BUG - give a BUG warning message and stack trace
> @@ -383,6 +392,7 @@ void __snd_printk(unsigned int level, co
> #else /* !CONFIG_SND_DEBUG */
>
> #define snd_printd(fmt, args...) do { } while (0)
> +#define _snd_printd(level, fmt, args...) do { } while (0)
> #define snd_BUG() do { } while (0)
> static inline int __snd_bug_on(int cond)
> {
>
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