drm/i915: Set up the documented clock gating on Sandybridge and Ironlake.
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 2720bc2..cbbf59f 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2176,6 +2176,14 @@
#define DISPLAY_PORT_PLL_BIOS_1 0x46010
#define DISPLAY_PORT_PLL_BIOS_2 0x46014
+#define PCH_DSPCLK_GATE_D 0x42020
+# define DPFDUNIT_CLOCK_GATE_DISABLE (1 << 7)
+# define DPARBUNIT_CLOCK_GATE_DISABLE (1 << 5)
+
+#define PCH_3DCGDIS0 0x46020
+# define MARIUNIT_CLOCK_GATE_DISABLE (1 << 18)
+# define SVSMUNIT_CLOCK_GATE_DISABLE (1 << 1)
+
#define FDI_PLL_FREQ_CTL 0x46030
#define FDI_PLL_FREQ_CHANGE_REQUEST (1<<24)
#define FDI_PLL_FREQ_LOCK_LIMIT_MASK 0xfff00
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 0e2c5da..58fc7fa 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4717,6 +4717,20 @@
* specs, but enable as much else as we can.
*/
if (HAS_PCH_SPLIT(dev)) {
+ uint32_t dspclk_gate = VRHUNIT_CLOCK_GATE_DISABLE;
+
+ if (IS_IRONLAKE(dev)) {
+ /* Required for FBC */
+ dspclk_gate |= DPFDUNIT_CLOCK_GATE_DISABLE;
+ /* Required for CxSR */
+ dspclk_gate |= DPARBUNIT_CLOCK_GATE_DISABLE;
+
+ I915_WRITE(PCH_3DCGDIS0,
+ MARIUNIT_CLOCK_GATE_DISABLE |
+ SVSMUNIT_CLOCK_GATE_DISABLE);
+ }
+
+ I915_WRITE(PCH_DSPCLK_GATE_D, dspclk_gate);
return;
} else if (IS_G4X(dev)) {
uint32_t dspclk_gate;
