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drm/i915/bxt: add description about the BXT PHYs

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Extend the VLV/CHV DPIO (PHY) documentation with the BXT specifics.

v2:
- add more detail about the mapping between ports and transcoders (ville)

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Imre Deak 2015-03-10 21:18:30 +02:00 committed by Daniel Vetter
parent 5c6706e564
commit eee215660c
2 changed files with 14 additions and 8 deletions
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4
Documentation/DocBook/drm.tmpl
View file

@ -4067,7 +4067,7 @@ int num_ioctls;</synopsis>
<title>DPIO</title>
!Pdrivers/gpu/drm/i915/i915_reg.h DPIO
<table id="dpiox2">
<title>Dual channel PHY (VLV/CHV)</title>
<title>Dual channel PHY (VLV/CHV/BXT)</title>
<tgroup cols="8">
<colspec colname="c0" />
<colspec colname="c1" />
@ -4118,7 +4118,7 @@ int num_ioctls;</synopsis>
</tgroup>
</table>
<table id="dpiox1">
<title>Single channel PHY (CHV)</title>
<title>Single channel PHY (CHV/BXT)</title>
<tgroup cols="4">
<colspec colname="c0" />
<colspec colname="c1" />

18
drivers/gpu/drm/i915/i915_reg.h
View file

@ -715,7 +715,7 @@ enum skl_disp_power_wells {
/**
* DOC: DPIO
*
* VLV and CHV have slightly peculiar display PHYs for driving DP/HDMI
* VLV, CHV and BXT have slightly peculiar display PHYs for driving DP/HDMI
* ports. DPIO is the name given to such a display PHY. These PHYs
* don't follow the standard programming model using direct MMIO
* registers, and instead their registers must be accessed trough IOSF
@ -746,7 +746,7 @@ enum skl_disp_power_wells {
* controlled from the display controller side. No DPIO registers
* need to be accessed during AUX communication,
*
* Generally the common lane corresponds to the pipe and
* Generally on VLV/CHV the common lane corresponds to the pipe and
* the spline (PCS/TX) corresponds to the port.
*
* For dual channel PHY (VLV/CHV):
@ -768,11 +768,17 @@ enum skl_disp_power_wells {
*
* port D == PCS/TX CH0
*
* Note: digital port B is DDI0, digital port C is DDI1,
* digital port D is DDI2
* On BXT the entire PHY channel corresponds to the port. That means
* the PLL is also now associated with the port rather than the pipe,
* and so the clock needs to be routed to the appropriate transcoder.
* Port A PLL is directly connected to transcoder EDP and port B/C
* PLLs can be routed to any transcoder A/B/C.
*
* Note: DDI0 is digital port B, DD1 is digital port C, and DDI2 is
* digital port D (CHV) or port A (BXT).
*/
/*
* Dual channel PHY (VLV/CHV)
* Dual channel PHY (VLV/CHV/BXT)
* ---------------------------------
* | CH0 | CH1 |
* | CMN/PLL/REF | CMN/PLL/REF |
@ -784,7 +790,7 @@ enum skl_disp_power_wells {
* | DDI0 | DDI1 | DP/HDMI ports
* ---------------------------------
*
* Single channel PHY (CHV)
* Single channel PHY (CHV/BXT)
* -----------------
* | CH0 |
* | CMN/PLL/REF |