From a09e89f67ca56d6fa7634bd0738d64fa61bc3c39 Mon Sep 17 00:00:00 2001 From: Adam Lackorzynski Date: Thu, 10 Mar 2011 17:41:56 +0100 Subject: [PATCH] ALSA: hda: Prevent writing ICH6_PCIREG_TCSEL on AMD systems azx_init_pci() always writes PCI config register ICH6_PCIREG_TCSEL although this looks to be only defined on Intel systems and has a different meaning on AMD systems. On AMD systems the PCI interrupt pin control register is modified instead. Since the meaning of offset 0x44 in device specific configuration space is unknown for devices by other vendors, we only exclude AMD systems to retain the current behaviour. Signed-off-by: Adam Lackorzynski Signed-off-by: Takashi Iwai --- sound/pci/hda/hda_intel.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c index fcedad9a5fef..70a9d32f0e96 100644 --- a/sound/pci/hda/hda_intel.c +++ b/sound/pci/hda/hda_intel.c @@ -1052,9 +1052,12 @@ static void azx_init_pci(struct azx *chip) /* Clear bits 0-2 of PCI register TCSEL (at offset 0x44) * TCSEL == Traffic Class Select Register, which sets PCI express QOS * Ensuring these bits are 0 clears playback static on some HD Audio - * codecs + * codecs. + * The PCI register TCSEL is defined in the Intel manuals. */ - update_pci_byte(chip->pci, ICH6_PCIREG_TCSEL, 0x07, 0); + if (chip->driver_type != AZX_DRIVER_ATI && + chip->driver_type != AZX_DRIVER_ATIHDMI) + update_pci_byte(chip->pci, ICH6_PCIREG_TCSEL, 0x07, 0); switch (chip->driver_type) { case AZX_DRIVER_ATI: -- 2.20.1