diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_display.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_display.c | 92 |
1 files changed, 91 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 731800542159..379679eb4366 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -5836,6 +5836,10 @@ static void i9xx_crtc_disable(struct intel_crtc_state *old_crtc_state, if (!dev_priv->display.initial_watermarks) intel_update_watermarks(intel_crtc); + + /* clock the pipe down to 640x480@60 to potentially save power */ + if (IS_I830(dev_priv)) + i830_enable_pipe(dev_priv, pipe); } static void intel_crtc_disable_noatomic(struct drm_crtc *crtc, @@ -15145,6 +15149,91 @@ int intel_modeset_init(struct drm_device *dev) return 0; } +void i830_enable_pipe(struct drm_i915_private *dev_priv, enum pipe pipe) +{ + /* 640x480@60Hz, ~25175 kHz */ + struct dpll clock = { + .m1 = 18, + .m2 = 7, + .p1 = 13, + .p2 = 4, + .n = 2, + }; + u32 dpll, fp; + int i; + + WARN_ON(i9xx_calc_dpll_params(48000, &clock) != 25154); + + DRM_DEBUG_KMS("enabling pipe %c due to force quirk (vco=%d dot=%d)\n", + pipe_name(pipe), clock.vco, clock.dot); + + fp = i9xx_dpll_compute_fp(&clock); + dpll = (I915_READ(DPLL(pipe)) & DPLL_DVO_2X_MODE) | + DPLL_VGA_MODE_DIS | + ((clock.p1 - 2) << DPLL_FPA01_P1_POST_DIV_SHIFT) | + PLL_P2_DIVIDE_BY_4 | + PLL_REF_INPUT_DREFCLK | + DPLL_VCO_ENABLE; + + I915_WRITE(FP0(pipe), fp); + I915_WRITE(FP1(pipe), fp); + + I915_WRITE(HTOTAL(pipe), (640 - 1) | ((800 - 1) << 16)); + I915_WRITE(HBLANK(pipe), (640 - 1) | ((800 - 1) << 16)); + I915_WRITE(HSYNC(pipe), (656 - 1) | ((752 - 1) << 16)); + I915_WRITE(VTOTAL(pipe), (480 - 1) | ((525 - 1) << 16)); + I915_WRITE(VBLANK(pipe), (480 - 1) | ((525 - 1) << 16)); + I915_WRITE(VSYNC(pipe), (490 - 1) | ((492 - 1) << 16)); + I915_WRITE(PIPESRC(pipe), ((640 - 1) << 16) | (480 - 1)); + + /* + * Apparently we need to have VGA mode enabled prior to changing + * the P1/P2 dividers. Otherwise the DPLL will keep using the old + * dividers, even though the register value does change. + */ + I915_WRITE(DPLL(pipe), dpll & ~DPLL_VGA_MODE_DIS); + I915_WRITE(DPLL(pipe), dpll); + + /* Wait for the clocks to stabilize. */ + POSTING_READ(DPLL(pipe)); + udelay(150); + + /* The pixel multiplier can only be updated once the + * DPLL is enabled and the clocks are stable. + * + * So write it again. + */ + I915_WRITE(DPLL(pipe), dpll); + + /* We do this three times for luck */ + for (i = 0; i < 3 ; i++) { + I915_WRITE(DPLL(pipe), dpll); + POSTING_READ(DPLL(pipe)); + udelay(150); /* wait for warmup */ + } + + I915_WRITE(PIPECONF(pipe), PIPECONF_ENABLE | PIPECONF_PROGRESSIVE); + POSTING_READ(PIPECONF(pipe)); +} + +void i830_disable_pipe(struct drm_i915_private *dev_priv, enum pipe pipe) +{ + DRM_DEBUG_KMS("disabling pipe %c due to force quirk\n", + pipe_name(pipe)); + + assert_plane_disabled(dev_priv, PLANE_A); + assert_plane_disabled(dev_priv, PLANE_B); + + I915_WRITE(PIPECONF(pipe), 0); + POSTING_READ(PIPECONF(pipe)); + + if (wait_for(pipe_dsl_stopped(dev_priv, pipe), 100)) + DRM_ERROR("pipe %c off wait timed out\n", pipe_name(pipe)); + + I915_WRITE(DPLL(pipe), DPLL_VGA_MODE_DIS); + POSTING_READ(DPLL(pipe)); +} + static void intel_enable_pipe_a(struct drm_device *dev, struct drm_modeset_acquire_ctx *ctx) { @@ -15274,7 +15363,8 @@ static void intel_sanitize_crtc(struct intel_crtc *crtc, crtc->plane = plane; } - if (dev_priv->quirks & QUIRK_PIPEA_FORCE && + if (!IS_I830(dev_priv) && + dev_priv->quirks & QUIRK_PIPEA_FORCE && crtc->pipe == PIPE_A && !crtc->active) { /* BIOS forgot to enable pipe A, this mostly happens after * resume. Force-enable the pipe to fix this, the update_dpms |
