[alsa-devel] [PATCH] ALSA: hda - Update BCLK also at hotplug for i915 HSW/BDW

[Takashi Iwai]

On Tue, 26 Apr 2016 10:02:50 +0200,
Takashi Iwai wrote:
> 
> The recent bug report suggests that BCLK setup for i915 HSW/BDW needs
> to be updated at each HDMI hotplug, not only at initialization and
> resume.  That is, we need to update HSW_EM4 and HSW_EM5 registers at
> ELD notification, too.  Otherwise the HDMI audio may be out of sync
> and played in a wrong pitch.
> 
> However, the HDA codec driver has no access to the controller
> registers, and currently the code managing these registers is in
> hda_intel.c, i.e. local to the controller driver.  For allowing the
> explicit BCLK update from the codec driver, as in this patch, the
> former haswell_set_bclk() in hda_intel.c is moved to hdac_i915.c and
> exposed as snd_hdac_i915_set_bclk().  This is called from both the HDA
> controller driver and intel_pin_eld_notify() in HDMI codec driver.
> 
> Along with this change, snd_hdac_get_display_clk() gets dropped as
> it's no longer used.
> 
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91410
> Cc: <stable at vger.kernel.org> # v4.5+
> Signed-off-by: Takashi Iwai <tiwai at suse.de>

Oops, this is an old patch.  The latest one will be submitted soon.
Sorry for the noise.


Takashi