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    ALSA: hda - Increase default bdl_pos_adj for Baytrail/Braswell · 2cf721db
    Takashi Iwai 提交于
    Intel Atom processors seem to have a problem at recording when
    bdl_pos_adj is set to an odd value.  When a value like 1 is used, it
    may drop the samples unexpectedly.  Actually, for the old Atoms, we
    used to set AZX_DRIVER_SCH type, and this assigns 32 as default.
    Meanwhile the newer chips, Baytrail and Braswell, are set as
    AZX_DRIVER_PCH, and the lower default value, 1, is assigned.
    
    This patch changes the default values for these chipsets to a safer
    default, 32, again.  Since changing the driver type (AZX_DRIVER_XXX)
    leads to the rename of the driver string, it would result in a
    possible regression.  So, we can't change the type.  Instead, in this
    patch, manual (ugly) PCI ID checks are added on top.
    
    A drawback by this increase is the slight increase of the latency, but
    it's a sub-ms order in normal situations, so mostly negligible.
    Reported-and-tested-by: NJochen Henneberg <jh@henneberg-systemdesign.com>
    Signed-off-by: NTakashi Iwai <tiwai@suse.de>
    2cf721db
hda_intel.c 64.4 KB