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author | Stephen Warren <swarren@nvidia.com> | 2011-05-24 23:11:17 (GMT) |
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committer | Takashi Iwai <tiwai@suse.de> | 2011-05-25 05:31:32 (GMT) |
commit | 5d44f927a5467d64c4f1e0d579bcb3f543c275e0 (patch) | |
tree | 87a270a36fee088f59bee2fd2d231e8f7dc656ca /sound/pci/hda/hda_eld.c | |
parent | 4e60b4f8300c1e15753e8c82c699d52603646200 (diff) | |
download | linux-fsl-qoriq-5d44f927a5467d64c4f1e0d579bcb3f543c275e0.tar.xz |
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>
Diffstat (limited to 'sound/pci/hda/hda_eld.c')
-rw-r--r-- | sound/pci/hda/hda_eld.c | 21 |
1 files changed, 3 insertions, 18 deletions
diff --git a/sound/pci/hda/hda_eld.c b/sound/pci/hda/hda_eld.c index 74b0560..b05f7be 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]); |