drm/i915: add dynamic clock frequency control
There are several sources of unnecessary power consumption on Intel
graphics systems. The first is the LVDS clock. TFTs don't suffer from
persistence issues like CRTs, and so we can reduce the LVDS refresh rate
when the screen is idle. It will be automatically upclocked when
userspace triggers graphical activity. Beyond that, we can enable memory
self refresh. This allows the memory to go into a lower power state when
the graphics are idle. Finally, we can drop some clocks on the gpu
itself. All of these things can be reenabled between frames when GPU
activity is triggered, and so there should be no user visible graphical
changes.
Signed-off-by: Jesse Barnes <jesse.barnes@intel.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 87a737f..884757c 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -55,7 +55,7 @@
/* PCI config space */
#define HPLLCC 0xc0 /* 855 only */
-#define GC_CLOCK_CONTROL_MASK (3 << 0)
+#define GC_CLOCK_CONTROL_MASK (0xf << 0)
#define GC_CLOCK_133_200 (0 << 0)
#define GC_CLOCK_100_200 (1 << 0)
#define GC_CLOCK_100_133 (2 << 0)
@@ -65,6 +65,25 @@
#define GC_DISPLAY_CLOCK_190_200_MHZ (0 << 4)
#define GC_DISPLAY_CLOCK_333_MHZ (4 << 4)
#define GC_DISPLAY_CLOCK_MASK (7 << 4)
+#define GM45_GC_RENDER_CLOCK_MASK (0xf << 0)
+#define GM45_GC_RENDER_CLOCK_266_MHZ (8 << 0)
+#define GM45_GC_RENDER_CLOCK_320_MHZ (9 << 0)
+#define GM45_GC_RENDER_CLOCK_400_MHZ (0xb << 0)
+#define GM45_GC_RENDER_CLOCK_533_MHZ (0xc << 0)
+#define I965_GC_RENDER_CLOCK_MASK (0xf << 0)
+#define I965_GC_RENDER_CLOCK_267_MHZ (2 << 0)
+#define I965_GC_RENDER_CLOCK_333_MHZ (3 << 0)
+#define I965_GC_RENDER_CLOCK_444_MHZ (4 << 0)
+#define I965_GC_RENDER_CLOCK_533_MHZ (5 << 0)
+#define I945_GC_RENDER_CLOCK_MASK (7 << 0)
+#define I945_GC_RENDER_CLOCK_166_MHZ (0 << 0)
+#define I945_GC_RENDER_CLOCK_200_MHZ (1 << 0)
+#define I945_GC_RENDER_CLOCK_250_MHZ (3 << 0)
+#define I945_GC_RENDER_CLOCK_400_MHZ (5 << 0)
+#define I915_GC_RENDER_CLOCK_MASK (7 << 0)
+#define I915_GC_RENDER_CLOCK_166_MHZ (0 << 0)
+#define I915_GC_RENDER_CLOCK_200_MHZ (1 << 0)
+#define I915_GC_RENDER_CLOCK_333_MHZ (4 << 0)
#define LBB 0xf4
/* VGA stuff */
@@ -553,9 +572,118 @@
#define DPLLA_TEST_M_BYPASS (1 << 2)
#define DPLLA_INPUT_BUFFER_ENABLE (1 << 0)
#define D_STATE 0x6104
-#define CG_2D_DIS 0x6200
-#define DPCUNIT_CLOCK_GATE_DISABLE (1 << 24)
-#define CG_3D_DIS 0x6204
+#define DSTATE_PLL_D3_OFF (1<<3)
+#define DSTATE_GFX_CLOCK_GATING (1<<1)
+#define DSTATE_DOT_CLOCK_GATING (1<<0)
+#define DSPCLK_GATE_D 0x6200
+# define DPUNIT_B_CLOCK_GATE_DISABLE (1 << 30) /* 965 */
+# define VSUNIT_CLOCK_GATE_DISABLE (1 << 29) /* 965 */
+# define VRHUNIT_CLOCK_GATE_DISABLE (1 << 28) /* 965 */
+# define VRDUNIT_CLOCK_GATE_DISABLE (1 << 27) /* 965 */
+# define AUDUNIT_CLOCK_GATE_DISABLE (1 << 26) /* 965 */
+# define DPUNIT_A_CLOCK_GATE_DISABLE (1 << 25) /* 965 */
+# define DPCUNIT_CLOCK_GATE_DISABLE (1 << 24) /* 965 */
+# define TVRUNIT_CLOCK_GATE_DISABLE (1 << 23) /* 915-945 */
+# define TVCUNIT_CLOCK_GATE_DISABLE (1 << 22) /* 915-945 */
+# define TVFUNIT_CLOCK_GATE_DISABLE (1 << 21) /* 915-945 */
+# define TVEUNIT_CLOCK_GATE_DISABLE (1 << 20) /* 915-945 */
+# define DVSUNIT_CLOCK_GATE_DISABLE (1 << 19) /* 915-945 */
+# define DSSUNIT_CLOCK_GATE_DISABLE (1 << 18) /* 915-945 */
+# define DDBUNIT_CLOCK_GATE_DISABLE (1 << 17) /* 915-945 */
+# define DPRUNIT_CLOCK_GATE_DISABLE (1 << 16) /* 915-945 */
+# define DPFUNIT_CLOCK_GATE_DISABLE (1 << 15) /* 915-945 */
+# define DPBMUNIT_CLOCK_GATE_DISABLE (1 << 14) /* 915-945 */
+# define DPLSUNIT_CLOCK_GATE_DISABLE (1 << 13) /* 915-945 */
+# define DPLUNIT_CLOCK_GATE_DISABLE (1 << 12) /* 915-945 */
+# define DPOUNIT_CLOCK_GATE_DISABLE (1 << 11)
+# define DPBUNIT_CLOCK_GATE_DISABLE (1 << 10)
+# define DCUNIT_CLOCK_GATE_DISABLE (1 << 9)
+# define DPUNIT_CLOCK_GATE_DISABLE (1 << 8)
+# define VRUNIT_CLOCK_GATE_DISABLE (1 << 7) /* 915+: reserved */
+# define OVHUNIT_CLOCK_GATE_DISABLE (1 << 6) /* 830-865 */
+# define DPIOUNIT_CLOCK_GATE_DISABLE (1 << 6) /* 915-945 */
+# define OVFUNIT_CLOCK_GATE_DISABLE (1 << 5)
+# define OVBUNIT_CLOCK_GATE_DISABLE (1 << 4)
+/**
+ * This bit must be set on the 830 to prevent hangs when turning off the
+ * overlay scaler.
+ */
+# define OVRUNIT_CLOCK_GATE_DISABLE (1 << 3)
+# define OVCUNIT_CLOCK_GATE_DISABLE (1 << 2)
+# define OVUUNIT_CLOCK_GATE_DISABLE (1 << 1)
+# define ZVUNIT_CLOCK_GATE_DISABLE (1 << 0) /* 830 */
+# define OVLUNIT_CLOCK_GATE_DISABLE (1 << 0) /* 845,865 */
+
+#define RENCLK_GATE_D1 0x6204
+# define BLITTER_CLOCK_GATE_DISABLE (1 << 13) /* 945GM only */
+# define MPEG_CLOCK_GATE_DISABLE (1 << 12) /* 945GM only */
+# define PC_FE_CLOCK_GATE_DISABLE (1 << 11)
+# define PC_BE_CLOCK_GATE_DISABLE (1 << 10)
+# define WINDOWER_CLOCK_GATE_DISABLE (1 << 9)
+# define INTERPOLATOR_CLOCK_GATE_DISABLE (1 << 8)
+# define COLOR_CALCULATOR_CLOCK_GATE_DISABLE (1 << 7)
+# define MOTION_COMP_CLOCK_GATE_DISABLE (1 << 6)
+# define MAG_CLOCK_GATE_DISABLE (1 << 5)
+/** This bit must be unset on 855,865 */
+# define MECI_CLOCK_GATE_DISABLE (1 << 4)
+# define DCMP_CLOCK_GATE_DISABLE (1 << 3)
+# define MEC_CLOCK_GATE_DISABLE (1 << 2)
+# define MECO_CLOCK_GATE_DISABLE (1 << 1)
+/** This bit must be set on 855,865. */
+# define SV_CLOCK_GATE_DISABLE (1 << 0)
+# define I915_MPEG_CLOCK_GATE_DISABLE (1 << 16)
+# define I915_VLD_IP_PR_CLOCK_GATE_DISABLE (1 << 15)
+# define I915_MOTION_COMP_CLOCK_GATE_DISABLE (1 << 14)
+# define I915_BD_BF_CLOCK_GATE_DISABLE (1 << 13)
+# define I915_SF_SE_CLOCK_GATE_DISABLE (1 << 12)
+# define I915_WM_CLOCK_GATE_DISABLE (1 << 11)
+# define I915_IZ_CLOCK_GATE_DISABLE (1 << 10)
+# define I915_PI_CLOCK_GATE_DISABLE (1 << 9)
+# define I915_DI_CLOCK_GATE_DISABLE (1 << 8)
+# define I915_SH_SV_CLOCK_GATE_DISABLE (1 << 7)
+# define I915_PL_DG_QC_FT_CLOCK_GATE_DISABLE (1 << 6)
+# define I915_SC_CLOCK_GATE_DISABLE (1 << 5)
+# define I915_FL_CLOCK_GATE_DISABLE (1 << 4)
+# define I915_DM_CLOCK_GATE_DISABLE (1 << 3)
+# define I915_PS_CLOCK_GATE_DISABLE (1 << 2)
+# define I915_CC_CLOCK_GATE_DISABLE (1 << 1)
+# define I915_BY_CLOCK_GATE_DISABLE (1 << 0)
+
+# define I965_RCZ_CLOCK_GATE_DISABLE (1 << 30)
+/** This bit must always be set on 965G/965GM */
+# define I965_RCC_CLOCK_GATE_DISABLE (1 << 29)
+# define I965_RCPB_CLOCK_GATE_DISABLE (1 << 28)
+# define I965_DAP_CLOCK_GATE_DISABLE (1 << 27)
+# define I965_ROC_CLOCK_GATE_DISABLE (1 << 26)
+# define I965_GW_CLOCK_GATE_DISABLE (1 << 25)
+# define I965_TD_CLOCK_GATE_DISABLE (1 << 24)
+/** This bit must always be set on 965G */
+# define I965_ISC_CLOCK_GATE_DISABLE (1 << 23)
+# define I965_IC_CLOCK_GATE_DISABLE (1 << 22)
+# define I965_EU_CLOCK_GATE_DISABLE (1 << 21)
+# define I965_IF_CLOCK_GATE_DISABLE (1 << 20)
+# define I965_TC_CLOCK_GATE_DISABLE (1 << 19)
+# define I965_SO_CLOCK_GATE_DISABLE (1 << 17)
+# define I965_FBC_CLOCK_GATE_DISABLE (1 << 16)
+# define I965_MARI_CLOCK_GATE_DISABLE (1 << 15)
+# define I965_MASF_CLOCK_GATE_DISABLE (1 << 14)
+# define I965_MAWB_CLOCK_GATE_DISABLE (1 << 13)
+# define I965_EM_CLOCK_GATE_DISABLE (1 << 12)
+# define I965_UC_CLOCK_GATE_DISABLE (1 << 11)
+# define I965_SI_CLOCK_GATE_DISABLE (1 << 6)
+# define I965_MT_CLOCK_GATE_DISABLE (1 << 5)
+# define I965_PL_CLOCK_GATE_DISABLE (1 << 4)
+# define I965_DG_CLOCK_GATE_DISABLE (1 << 3)
+# define I965_QC_CLOCK_GATE_DISABLE (1 << 2)
+# define I965_FT_CLOCK_GATE_DISABLE (1 << 1)
+# define I965_DM_CLOCK_GATE_DISABLE (1 << 0)
+
+#define RENCLK_GATE_D2 0x6208
+#define VF_UNIT_CLOCK_GATE_DISABLE (1 << 9)
+#define GS_UNIT_CLOCK_GATE_DISABLE (1 << 7)
+#define CL_UNIT_CLOCK_GATE_DISABLE (1 << 6)
+#define RAMCLK_GATE_D 0x6210 /* CRL only */
+#define DEUC 0x6214 /* CRL only */
/*
* Palette regs
@@ -1588,6 +1716,7 @@
#define PIPECONF_PROGRESSIVE (0 << 21)
#define PIPECONF_INTERLACE_W_FIELD_INDICATION (6 << 21)
#define PIPECONF_INTERLACE_FIELD_0_ONLY (7 << 21)
+#define PIPECONF_CXSR_DOWNCLOCK (1<<16)
#define PIPEASTAT 0x70024
#define PIPE_FIFO_UNDERRUN_STATUS (1UL<<31)
#define PIPE_CRC_ERROR_ENABLE (1UL<<29)