From c43d0188d7be6e45eb52a27ed9df714ca2e04e0a Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Tue, 11 Dec 2012 12:01:42 +0000 Subject: [PATCH] drm/i915: Fixup cursor latency used for IVB lp3 watermarks It operates at twice the declared latency, so adjust the computation to avoid potential flicker at low power. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=50248 Signed-off-by: Chris Wilson CC: Jesse Barnes Reviewed-by: Jesse Barnes Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_pm.c | 117 ++++++++++++++++++++++++++++++-- 1 file changed, 112 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 42839fc73499..9f1ee07ec4ae 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -1811,8 +1811,110 @@ static void sandybridge_update_wm(struct drm_device *dev) enabled |= 2; } - if ((dev_priv->num_pipe == 3) && - g4x_compute_wm0(dev, 2, + /* + * Calculate and update the self-refresh watermark only when one + * display plane is used. + * + * SNB support 3 levels of watermark. + * + * WM1/WM2/WM2 watermarks have to be enabled in the ascending order, + * and disabled in the descending order + * + */ + I915_WRITE(WM3_LP_ILK, 0); + I915_WRITE(WM2_LP_ILK, 0); + I915_WRITE(WM1_LP_ILK, 0); + + if (!single_plane_enabled(enabled) || + dev_priv->sprite_scaling_enabled) + return; + enabled = ffs(enabled) - 1; + + /* WM1 */ + if (!ironlake_compute_srwm(dev, 1, enabled, + SNB_READ_WM1_LATENCY() * 500, + &sandybridge_display_srwm_info, + &sandybridge_cursor_srwm_info, + &fbc_wm, &plane_wm, &cursor_wm)) + return; + + I915_WRITE(WM1_LP_ILK, + WM1_LP_SR_EN | + (SNB_READ_WM1_LATENCY() << WM1_LP_LATENCY_SHIFT) | + (fbc_wm << WM1_LP_FBC_SHIFT) | + (plane_wm << WM1_LP_SR_SHIFT) | + cursor_wm); + + /* WM2 */ + if (!ironlake_compute_srwm(dev, 2, enabled, + SNB_READ_WM2_LATENCY() * 500, + &sandybridge_display_srwm_info, + &sandybridge_cursor_srwm_info, + &fbc_wm, &plane_wm, &cursor_wm)) + return; + + I915_WRITE(WM2_LP_ILK, + WM2_LP_EN | + (SNB_READ_WM2_LATENCY() << WM1_LP_LATENCY_SHIFT) | + (fbc_wm << WM1_LP_FBC_SHIFT) | + (plane_wm << WM1_LP_SR_SHIFT) | + cursor_wm); + + /* WM3 */ + if (!ironlake_compute_srwm(dev, 3, enabled, + SNB_READ_WM3_LATENCY() * 500, + &sandybridge_display_srwm_info, + &sandybridge_cursor_srwm_info, + &fbc_wm, &plane_wm, &cursor_wm)) + return; + + I915_WRITE(WM3_LP_ILK, + WM3_LP_EN | + (SNB_READ_WM3_LATENCY() << WM1_LP_LATENCY_SHIFT) | + (fbc_wm << WM1_LP_FBC_SHIFT) | + (plane_wm << WM1_LP_SR_SHIFT) | + cursor_wm); +} + +static void ivybridge_update_wm(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + int latency = SNB_READ_WM0_LATENCY() * 100; /* In unit 0.1us */ + u32 val; + int fbc_wm, plane_wm, cursor_wm; + int ignore_fbc_wm, ignore_plane_wm, ignore_cursor_wm; + unsigned int enabled; + + enabled = 0; + if (g4x_compute_wm0(dev, 0, + &sandybridge_display_wm_info, latency, + &sandybridge_cursor_wm_info, latency, + &plane_wm, &cursor_wm)) { + val = I915_READ(WM0_PIPEA_ILK); + val &= ~(WM0_PIPE_PLANE_MASK | WM0_PIPE_CURSOR_MASK); + I915_WRITE(WM0_PIPEA_ILK, val | + ((plane_wm << WM0_PIPE_PLANE_SHIFT) | cursor_wm)); + DRM_DEBUG_KMS("FIFO watermarks For pipe A -" + " plane %d, " "cursor: %d\n", + plane_wm, cursor_wm); + enabled |= 1; + } + + if (g4x_compute_wm0(dev, 1, + &sandybridge_display_wm_info, latency, + &sandybridge_cursor_wm_info, latency, + &plane_wm, &cursor_wm)) { + val = I915_READ(WM0_PIPEB_ILK); + val &= ~(WM0_PIPE_PLANE_MASK | WM0_PIPE_CURSOR_MASK); + I915_WRITE(WM0_PIPEB_ILK, val | + ((plane_wm << WM0_PIPE_PLANE_SHIFT) | cursor_wm)); + DRM_DEBUG_KMS("FIFO watermarks For pipe B -" + " plane %d, cursor: %d\n", + plane_wm, cursor_wm); + enabled |= 2; + } + + if (g4x_compute_wm0(dev, 2, &sandybridge_display_wm_info, latency, &sandybridge_cursor_wm_info, latency, &plane_wm, &cursor_wm)) { @@ -1875,12 +1977,17 @@ static void sandybridge_update_wm(struct drm_device *dev) (plane_wm << WM1_LP_SR_SHIFT) | cursor_wm); - /* WM3 */ + /* WM3, note we have to correct the cursor latency */ if (!ironlake_compute_srwm(dev, 3, enabled, SNB_READ_WM3_LATENCY() * 500, &sandybridge_display_srwm_info, &sandybridge_cursor_srwm_info, - &fbc_wm, &plane_wm, &cursor_wm)) + &fbc_wm, &plane_wm, &ignore_cursor_wm) || + !ironlake_compute_srwm(dev, 3, enabled, + 2 * SNB_READ_WM3_LATENCY() * 500, + &sandybridge_display_srwm_info, + &sandybridge_cursor_srwm_info, + &ignore_fbc_wm, &ignore_plane_wm, &cursor_wm)) return; I915_WRITE(WM3_LP_ILK, @@ -4005,7 +4112,7 @@ void intel_init_pm(struct drm_device *dev) } else if (IS_IVYBRIDGE(dev)) { /* FIXME: detect B0+ stepping and use auto training */ if (SNB_READ_WM0_LATENCY()) { - dev_priv->display.update_wm = sandybridge_update_wm; + dev_priv->display.update_wm = ivybridge_update_wm; dev_priv->display.update_sprite_wm = sandybridge_update_sprite_wm; } else { DRM_DEBUG_KMS("Failed to read display plane latency. "