From 535115b5ff51c702a9a22feb918707c2fe1fbd17 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Fri, 12 Jun 2015 07:53:58 +0200
Subject: [PATCH] ALSA: hda - Abort the probe without i915 binding for HSW/BDW
The previous patch tried to continue the probe if i915 binding fails.
For for simplicity reason, we haven't implemented abort even for
controller chips that are dedicated for HDMI/DP on HSW and BDW.
However, Mengdong suggested that this can be dangerous; BIOS may
disable gfx power well although the PCI entry for HD-audio is left,
and this may result in the unexpected behavior, kernel errors, etc.
For avoiding this situation, abort the probe at i915 binding failure
only for HSW/BDW chips selectively. For other chips, it still
continues.
Fixes: bf06848bdbe5 ('ALSA: hda - Continue probing even if i915 binding fails')
Reported-by: Mengdong Lin <mengdong.lin@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/pci/hda/hda_intel.c | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 8a0af6770e1d..a244ba706317 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -340,6 +340,11 @@ enum {
#define use_vga_switcheroo(chip) 0
#endif
+#define CONTROLLER_IN_GPU(pci) (((pci)->device == 0x0a0c) || \
+ ((pci)->device == 0x0c0c) || \
+ ((pci)->device == 0x0d0c) || \
+ ((pci)->device == 0x160c))
+
static char *driver_short_names[] = {
[AZX_DRIVER_ICH] = "HDA Intel",
[AZX_DRIVER_PCH] = "HDA Intel PCH",
@@ -1854,8 +1859,17 @@ static int azx_probe_continue(struct azx *chip)
if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) {
#ifdef CONFIG_SND_HDA_I915
err = hda_i915_init(hda);
- if (err < 0)
- goto skip_i915;
+ if (err < 0) {
+ /* if the controller is bound only with HDMI/DP
+ * (for HSW and BDW), we need to abort the probe;
+ * for other chips, still continue probing as other
+ * codecs can be on the same link.
+ */
+ if (CONTROLLER_IN_GPU(pci))
+ goto out_free;
+ else
+ goto skip_i915;
+ }
err = hda_display_power(hda, true);
if (err < 0) {
dev_err(chip->card->dev,