Re: [alsa-devel] [PATCH v3] ALSA: hda: hdmi - fix regression in connect list handling

Sorry for this regression,

This idea to copy the values directly from spec->cvt_nids here without the override hack as we have now, seems good to me.

Thanks, Nikhil mahale

On 11/27/19 9:42 PM, Kai Vehmanen wrote:

Fix regression in how intel_haswell_fixup_connect_list() results are used in hda_read_pin_conn(). Use of snd_hda_get_raw_connections() in hda_read_pin_conn() bypasses the cache and thus also bypasses the overridden pin connection list. On platforms that require the connection list fixup, mux list will be empty and HDMI playback will fail to -EBUSY at open.

Fix the regression in hda_read_pinn_conn(). Simplify code as suggested by Takashi Iwai to remove old intel_haswell_fixup_connect_list() and copy the cvt_nid list directly and not use snd_hda_override_conn_list() at all.

Fixes: 9c32fea83692 ("ALSA: hda - Add DP-MST support for non-acomp codecs") BugLink: https://github.com/thesofproject/linux/issues/1537 Cc: Nikhil Mahale nmahale@nvidia.com Signed-off-by: Kai Vehmanen kai.vehmanen@linux.intel.com

---

sound/pci/hda/patch_hdmi.c | 38 ++++++++++++-------------------------- 1 file changed, 12 insertions(+), 26 deletions(-)

diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c index 55d20e40a195..373ca99b7a2f 100644 --- a/sound/pci/hda/patch_hdmi.c +++ b/sound/pci/hda/patch_hdmi.c @@ -1302,6 +1302,7 @@ static int hdmi_read_pin_conn(struct hda_codec *codec, int pin_idx) struct hdmi_spec_per_pin *per_pin = get_pin(spec, pin_idx); hda_nid_t pin_nid = per_pin->pin_nid; int dev_id = per_pin->dev_id;

• int conns;

  if (!(get_wcaps(codec, pin_nid) & AC_WCAP_CONN_LIST)) { codec_warn(codec,

@@ -1312,10 +1313,18 @@ static int hdmi_read_pin_conn(struct hda_codec *codec, int pin_idx)

snd_hda_set_dev_select(codec, pin_nid, dev_id);

• if (spec->intel_hsw_fixup) {

• conns = spec->num_cvts;
  

• memcpy(per_pin->mux_nids, spec->cvt_nids,
  

•        sizeof(hda_nid_t) * conns);
  

• } else {

• conns = snd_hda_get_raw_connections(codec, pin_nid,
  

• 				    per_pin->mux_nids,
  

• 				    HDA_MAX_CONNECTIONS);
  

• }
• /* all the device entries on the same pin have the same conn list */

• per_pin->num_mux_nids =

• snd_hda_get_raw_connections(codec, pin_nid, per_pin->mux_nids,
  

• 			    HDA_MAX_CONNECTIONS);
  

• per_pin->num_mux_nids = conns;

  return 0;

} @@ -1713,9 +1722,6 @@ static void hdmi_repoll_eld(struct work_struct *work) mutex_unlock(&spec->pcm_lock); }

-static void intel_haswell_fixup_connect_list(struct hda_codec *codec,

• 			     hda_nid_t nid);
  

static int hdmi_add_pin(struct hda_codec *codec, hda_nid_t pin_nid) { struct hdmi_spec *spec = codec->spec; @@ -1790,8 +1796,6 @@ static int hdmi_add_pin(struct hda_codec *codec, hda_nid_t pin_nid) per_pin->dev_id = i; per_pin->non_pcm = false; snd_hda_set_dev_select(codec, pin_nid, i);

• if (spec->intel_hsw_fixup)
  

• 	intel_haswell_fixup_connect_list(codec, pin_nid);
  

  err = hdmi_read_pin_conn(codec, pin_idx); if (err < 0) return err;

@@ -2603,24 +2607,6 @@ static void generic_acomp_init(struct hda_codec *codec,

• Intel codec parsers and helpers

*/

-static void intel_haswell_fixup_connect_list(struct hda_codec *codec,

• 			     hda_nid_t nid)
  

-{

• struct hdmi_spec *spec = codec->spec;
• hda_nid_t conns[4];
• int nconns;
• nconns = snd_hda_get_raw_connections(codec, nid, conns,

• 			     ARRAY_SIZE(conns));
  

• if (nconns == spec->num_cvts &&

•    !memcmp(conns, spec->cvt_nids, spec->num_cvts * sizeof(hda_nid_t)))
  

• return;
  

• /* override pins connection list */
• codec_dbg(codec, "hdmi: haswell: override pin connection 0x%x\n", nid);
• snd_hda_override_conn_list(codec, nid, spec->num_cvts, spec->cvt_nids);

-}

#define INTEL_GET_VENDOR_VERB 0xf81 #define INTEL_SET_VENDOR_VERB 0x781 #define INTEL_EN_DP12 0x02 /* enable DP 1.2 features */