drm/i915/bxt: IPC WA for Broxton
Display Workarounds #1135 If IPC is enabled in BXT, display underruns are observed. WA: The Line Time programmed in the WM_LINETIME register should be half of the actual calculated Line Time. Programmed Line Time = 1/2*Calculated Line Time Changes since V1: - Add Workaround number in commit & code Changes since V2 (from Paulo): - Bikeshed white space and make the WA tag look like the others Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com> Signed-off-by: Mahesh Kumar <mahesh1.kumar@intel.com> Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20161201154940.24446-3-mahesh1.kumar@intel.com
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@ -1239,6 +1239,8 @@ int i915_driver_load(struct pci_dev *pdev, const struct pci_device_id *ent)
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intel_runtime_pm_enable(dev_priv);
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dev_priv->ipc_enabled = false;
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/* Everything is in place, we can now relax! */
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DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n",
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driver.name, driver.major, driver.minor, driver.patchlevel,
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@ -2329,6 +2329,8 @@ struct drm_i915_private {
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/* perform PHY state sanity checks? */
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bool chv_phy_assert[2];
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bool ipc_enabled;
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/* Used to save the pipe-to-encoder mapping for audio */
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struct intel_encoder *av_enc_map[I915_MAX_PIPES];
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@ -3761,7 +3761,10 @@ skl_compute_wm_level(const struct drm_i915_private *dev_priv,
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static uint32_t
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skl_compute_linetime_wm(struct intel_crtc_state *cstate)
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{
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struct drm_atomic_state *state = cstate->base.state;
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struct drm_i915_private *dev_priv = to_i915(state->dev);
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uint32_t pixel_rate;
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uint32_t linetime_wm;
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if (!cstate->base.active)
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return 0;
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@ -3771,8 +3774,14 @@ skl_compute_linetime_wm(struct intel_crtc_state *cstate)
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if (WARN_ON(pixel_rate == 0))
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return 0;
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return DIV_ROUND_UP(8 * cstate->base.adjusted_mode.crtc_htotal * 1000,
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pixel_rate);
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linetime_wm = DIV_ROUND_UP(8 * cstate->base.adjusted_mode.crtc_htotal *
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1000, pixel_rate);
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/* Display WA #1135: bxt. */
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if (IS_BROXTON(dev_priv) && dev_priv->ipc_enabled)
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linetime_wm = DIV_ROUND_UP(linetime_wm, 2);
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return linetime_wm;
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}
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static void skl_compute_transition_wm(struct intel_crtc_state *cstate,
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