drm/i915: Move DPIO phy documentation section to intel_dpio_phy.c

[mirror_ubuntu-bionic-kernel.git] / drivers / gpu / drm / i915 / i915_reg.h

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 542e570b35787ac77ce4f0f23897ab49c601da61..2f504f6a1c51e6882874871a750ac5ddc732f303 100644 (file)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -830,96 +830,7 @@ enum skl_disp_power_wells {
 #define  CCK_FREQUENCY_STATUS_SHIFT            8
 #define  CCK_FREQUENCY_VALUES                  (0x1f << 0)
 
-/**
- * DOC: DPIO
- *
- * 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
- * sideband. VLV has one such PHY for driving ports B and C, and CHV
- * adds another PHY for driving port D. Each PHY responds to specific
- * IOSF-SB port.
- *
- * Each display PHY is made up of one or two channels. Each channel
- * houses a common lane part which contains the PLL and other common
- * logic. CH0 common lane also contains the IOSF-SB logic for the
- * Common Register Interface (CRI) ie. the DPIO registers. CRI clock
- * must be running when any DPIO registers are accessed.
- *
- * In addition to having their own registers, the PHYs are also
- * controlled through some dedicated signals from the display
- * controller. These include PLL reference clock enable, PLL enable,
- * and CRI clock selection, for example.
- *
- * Eeach channel also has two splines (also called data lanes), and
- * each spline is made up of one Physical Access Coding Sub-Layer
- * (PCS) block and two TX lanes. So each channel has two PCS blocks
- * and four TX lanes. The TX lanes are used as DP lanes or TMDS
- * data/clock pairs depending on the output type.
- *
- * Additionally the PHY also contains an AUX lane with AUX blocks
- * for each channel. This is used for DP AUX communication, but
- * this fact isn't really relevant for the driver since AUX is
- * controlled from the display controller side. No DPIO registers
- * need to be accessed during AUX communication,
- *
- * 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):
- *
- *  pipe A == CMN/PLL/REF CH0
- *
- *  pipe B == CMN/PLL/REF CH1
- *
- *  port B == PCS/TX CH0
- *
- *  port C == PCS/TX CH1
- *
- * This is especially important when we cross the streams
- * ie. drive port B with pipe B, or port C with pipe A.
- *
- * For single channel PHY (CHV):
- *
- *  pipe C == CMN/PLL/REF CH0
- *
- *  port D == PCS/TX CH0
- *
- * 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/BXT)
- *     ---------------------------------
- *     |      CH0      |      CH1      |
- *     |  CMN/PLL/REF  |  CMN/PLL/REF  |
- *     |---------------|---------------| Display PHY
- *     | PCS01 | PCS23 | PCS01 | PCS23 |
- *     |-------|-------|-------|-------|
- *     |TX0|TX1|TX2|TX3|TX0|TX1|TX2|TX3|
- *     ---------------------------------
- *     |     DDI0      |     DDI1      | DP/HDMI ports
- *     ---------------------------------
- *
- *     Single channel PHY (CHV/BXT)
- *     -----------------
- *     |      CH0      |
- *     |  CMN/PLL/REF  |
- *     |---------------| Display PHY
- *     | PCS01 | PCS23 |
- *     |-------|-------|
- *     |TX0|TX1|TX2|TX3|
- *     -----------------
- *     |     DDI2      | DP/HDMI port
- *     -----------------
- */
+/* DPIO registers */
 #define DPIO_DEVFN                     0
 
 #define DPIO_CTL                       _MMIO(VLV_DISPLAY_BASE + 0x2110)