[Intel-gfx] [PATCH v4 0/3] Haswell HDMI/DP audio enable

[Wang Xingchao]

This patch series enable HDMI audio on Haswell platform, not DP audio.
The DP enablement will come after the DP patches are upstream.

I tested this patch on Sharkbay machine and i could hear clear sound from
HDMI port.

V2 patches fixed one warning and some type errors.

V3 patches changes:
- change some registers definitions
- use macro for IBX/CPT/HSW to get registers
- remove some unused variable intended to use in TODO list.

v4 patches changes:
- remove alsa related hack patch

Here're some notes useful for you to test the patches on Sharkbay machine:
I> please make sure your branch include below three patches in Takashi's 
sound tree, othersiwe there's no proper Haswell ID and HDMI ID.  
http://git.alsa-project.org/?p=alsa-kmirror.git;a=commitdiff;h=79fc901301d6115b11457e8240ed6abc4b3f5c65
http://git.alsa-project.org/?p=alsa-kmirror.git;a=commitdiff;h=e269cee227a2b2297b79bfc71094c709b9387061
http://git.alsa-project.org/?p=alsa-kmirror.git;a=commitdiff;h=cb192625233496ac3d96cce667ebf4e322dab678

II> No sound from HDMI/DP.
we found it's not stable in current stage, sometimes you may not heard sound
from HDMI or DP port, but most of the time you can heard clear sound. After
some investigation, we suspect the HDA verb didnot really make codec 
change,and we regard the GPU register as the right one. (see III explanation)
the easy way is to use intel_audio_dump to compare related registers, and make
sure the port is enabled and unmute, otherwise there's no sound.
intel_audio_tools has no support on Haswell yet, i wrote patches to make that
happen, if you need the patches, please feel free to let me know. Here's part
of the snapshot about port enable and mute status from intel_audio_dump:

AUD_PORT_EN_HD_CFG  Port_B_Out_Enable			1
AUD_PORT_EN_HD_CFG  Port_C_Out_Enable			1
AUD_PORT_EN_HD_CFG  Port_D_Out_Enable			1
AUD_PORT_EN_HD_CFG  Port_B_Amp_Mute_Status		1
AUD_PORT_EN_HD_CFG  Port_C_Amp_Mute_Status		0
AUD_PORT_EN_HD_CFG  Port_D_Amp_Mute_Status		1

you can see from above message, the Port C is enabled and unmute, that's what
we expect.

III> HDA Codec dependency. When you found there's no sound from HDMI, please
use intel_audio_dump to check Port enable/mute status in II and also check
related Pipe/Transcoder/DDI port status. Sometimes the pipe and transcoder was
disabled in dpms and will not work anymore, that results in the HDMI port no
sound. HDA codec's three converters are somehow hardwired to audio Pipes and
if you choose the pipe, that means the regarding Codec converter should be
enabled too, and only one digital Pin's HDA verbs could work, that depends on
whehter your Pin select the converter as input. Here's one example about the
Pipe/Transcoder/DDI port(Pipe B, DDI Port C):

DDI_BUF_CTL_A         0x00000080  DDI Buffer Controler A
DDI_BUF_CTL_B         0x00000000  DDI Buffer Controler B
DDI_BUF_CTL_C         0x80000000  DDI Buffer Controler C
DDI_BUF_CTL_D         0x00000000  DDI Buffer Controler D
DDI_BUF_CTL_E         0x80000002  DDI Buffer Controler E
PIPE_CONF_A           0xc0000000  PIPE Configuration A
PIPE_CONF_B           0xc0000000  PIPE Configuration B
PIPE_CONF_C           0x00000000  PIPE Configuration C
PIPE_CONF_EDP         0x00000000  PIPE Configuration EDP
PIPE_DDI_FUNC_CTL_A   0xc4034002  PIPE DDI Function Control A
PIPE_DDI_FUNC_CTL_B   0xa0035000  PIPE DDI Function Control B
PIPE_DDI_FUNC_CTL_C   0x00030000  PIPE DDI Function Control C
PIPE_DDI_FUNC_CTL_EDP 0x00030000  PIPE DDI Function Control EDP

Wang Xingchao (3):
  drm/i915: HSW audio registers definition
  drm/i915: write eld info for HDMI audio
  drm/i915: Haswell HDMI audio enable

 drivers/gpu/drm/i915/i915_reg.h      |   76 ++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_ddi.c     |    6 ++-
 drivers/gpu/drm/i915/intel_display.c |   52 ++++++++++++++++++-----
 3 files changed, 123 insertions(+), 11 deletions(-)

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1.7.9.5