> -----Original Message----- > From: Intel-gfx [mailto:intel-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of > Jani Nikula > On Wed, 17 Jun 2015, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> wrote: > > On Wed, Jun 17, 2015 at 02:01:57PM +1000, Dave Airlie wrote: > >> From: Dave Airlie <airlied@xxxxxxxxxx> > >> > >> This just adds enables for the codecs and debugfs support for mst > >> connectors to print the audio info. > >> > >> This relies on patches to the audio code to do anything more useful. > >> > >> Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx> > >> --- > >> @@ -231,6 +231,7 @@ static void hsw_audio_codec_enable(struct > drm_connector *connector, > >> /* Reset ELD write address */ > >> tmp = I915_READ(HSW_AUD_DIP_ELD_CTRL(pipe)); > >> tmp &= ~IBX_ELD_ADDRESS_MASK; > >> + tmp |= ((pipe + 1) << 29); I think we should not add this line. DIP Port Select [Bit 30:29 ]of register AUD_DIP_ELD_CTRL_ST is ReadOnly. For DP MST, I think the device select happens in both i915 driver and HD-Audio driver: - For i915 driver, it should select which transcoder/pipe is connected to a device on a port. MST allows 3 devices on a port. Could someone guide me to the code? The Bit 30:29 just reflect the selection, although I think this is not enough because it only tell the port number, but now we hope know the device entry on a port. - For audio driver, it should select which convertor is connected to a device of a codec pin (pin is a mapping for a DDI port). We need to add the support in HD-A driver. The default device entry is 0 for a pin. Current HD-A driver does not handle other 2 device entries on a pin. Thanks Mengdong > >> I915_WRITE(HSW_AUD_DIP_ELD_CTRL(pipe), tmp); > > > > This is not MST specific. Is this a bug fix we want ASAP? > > > """ > This read-only bit reflects which port is used to transmit the DIP data. This can > only change when DIP is disabled. If one or more audio-related DIP packets is > enabled and audio is enabled on a digital port, these bits will reflect the digital > port to which audio is directed. > > For DP MST, this is the device select/pipe select. > """ > > We shouldn't mess with the field if it's regular DP. Also "pipe + 1" is too magic; > unfortunately I don't know what it should be. :( > > BR, > Jani. > > > > > > > > > -Chris > > > > -- > > Chris Wilson, Intel Open Source Technology Centre > > _______________________________________________ > > Intel-gfx mailing list > > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx > > http://lists.freedesktop.org/mailman/listinfo/intel-gfx > > -- > Jani Nikula, Intel Open Source Technology Center > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx > http://lists.freedesktop.org/mailman/listinfo/intel-gfx _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
