ALSA: HDA: Unify HDMI hotplug handling.

This change unifies the initial handling of a pin's state with the code to
update a pin's state after a hotplug (unsolicited response) event. The
initial probing, and all updates, are now routed through hdmi_present_sense.

The stored PD and ELDV status is now always derived from GetPinSense verb
execution, and not from the data in the unsolicited response. This means:

a) The WAR for NVIDIA codec's UR.PD values ("old_pin_detect") can be
   removed, since this only affected the no-longer-used unsolicited
   response payload.

b) In turn, this means that most NVIDIA codecs can simply use
   patch_generic_hdmi instead of having a custom variant just to set
   old_pin_detect.

c) When PD && ELDV becomes true, no extra verbs are executed, because the
   GetPinSense that was previously executed by snd_hdmi_get_eld (really,
   hdmi_eld_valid) has simply moved into hdmi_present_sense.

d) When PD && ELDV becomes false, there is a single extra GetPinSense verb
   executed for codecs where old_pin_detect wasn't set, i.e. some NVIDIA,
   and all ATI/AMD and Intel codecs. I doubt this will be a performance
   issue.

The new unified code in hdmi_present_sense also ensures that eld->eld_valid
is not set unless eld->monitor_present is also set. This protects against
potential invalid combinations of PD and ELDV received from HW, and
transitively from a graphics driver.

Also, print the derived PD/ELDV bits from hdmi_present_sense so the kernel
log always displays the actual state stored, which will differ from the
values in the unsolicited response for NVIDIA HW where old_pin_detect was
previously set.

Finally, a couple of small tweaks originally by Takashi:

* Clear the ELD content to zero before reading it, so that if it's not
  read (i.e. when !(PD && ELDV)) it's in a known state.

* Don't show ELD fields in /proc ELD files when the ELD isn't valid.

The only possibility I can see for regression here is a codec where the
GetPinSense verb returns incorrect data. However, we're already exposed
to that, since that data is used (a) from hdmi_add_pin to set up the
initial pin state, and (b) within snd_hda_input_jack_report to query
a pin's presence value. As such, I don't believe any HW has bugs here.

Includes-changes-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 3 insertions, 18 deletions

diff --git a/sound/pci/hda/hda_eld.c b/sound/pci/hda/hda_eld.c
index 74b0560289c0..b05f7be9dc1b 100644
--- a/sound/pci/hda/hda_eld.c
+++ b/sound/pci/hda/hda_eld.c
@@ -312,23 +312,6 @@ out_fail:
         return -EINVAL;
 }
 
-static int hdmi_eld_valid(struct hda_codec *codec, hda_nid_t nid)
-{
-        int eldv;
-        int present;
-
-        present = snd_hda_pin_sense(codec, nid);
-        eldv    = (present & AC_PINSENSE_ELDV);
-        present = (present & AC_PINSENSE_PRESENCE);
-
-#ifdef CONFIG_SND_DEBUG_VERBOSE
-        printk(KERN_INFO "HDMI: sink_present = %d, eld_valid = %d\n",
-                        !!present, !!eldv);
-#endif
-
-        return eldv && present;
-}
-
 int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid)
 {
         return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_SIZE,
@@ -343,7 +326,7 @@ int snd_hdmi_get_eld(struct hdmi_eld *eld,
         int size;
         unsigned char *buf;
 
-        if (!hdmi_eld_valid(codec, nid))
+        if (!eld->eld_valid)
                 return -ENOENT;
 
         size = snd_hdmi_get_eld_size(codec, nid);
@@ -477,6 +460,8 @@ static void hdmi_print_eld_info(struct snd_info_entry *entry,
 
         snd_iprintf(buffer, "monitor_present\t\t%d\n", e->monitor_present);
         snd_iprintf(buffer, "eld_valid\t\t%d\n", e->eld_valid);
+        if (!e->eld_valid)
+                return;
         snd_iprintf(buffer, "monitor_name\t\t%s\n", e->monitor_name);
         snd_iprintf(buffer, "connection_type\t\t%s\n",
                                 eld_connection_type_names[e->conn_type]);