This should allow us to avoid mode sets for some panel fitter config
changes.
Signed-off-by: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_display.c | 48 ++++++++++++++++++++++++++++++++++++
1 file changed, 48 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 10468a7..84331a3 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11420,6 +11420,50 @@ static void disable_crtc_nofb(struct intel_crtc *crtc)
crtc->new_config = NULL;
}
+/* Do we need a mode set due to pfit changes? */
+static bool intel_pfit_changed(struct drm_device *dev,
+ struct intel_crtc_config *new_config,
+ struct intel_crtc_config *cur_config)
+{
+ bool ret = false;
+
+ if (HAS_DDI(dev) || HAS_PCH_SPLIT(dev)) {
+ /*
+ * On PCH platforms we can disable pfit w/o a pipe shutdown,
+ * otherwise we'll need a mode set.
+ */
+ if (new_config->pch_pfit.enabled &&
+ cur_config->pch_pfit.enabled)
+ ret = false;
+ else if (new_config->pch_pfit.enabled &&
+ !cur_config->pch_pfit.enabled)
+ ret = true;
+ else if (!new_config->pch_pfit.enabled &&
+ cur_config->pch_pfit.enabled)
+ ret = false;
+ else if (!new_config->pch_pfit.enabled &&
+ !cur_config->pch_pfit.enabled)
+ ret = false;
+ } else {
+ bool new_enabled, old_enabled;
+
+ new_enabled = !!(new_config->gmch_pfit.control & PFIT_ENABLE);
+ old_enabled = !!(cur_config->gmch_pfit.control & PFIT_ENABLE);
+
+ /* 9xx only needs a shutdown to disable pfit */
+ if (new_enabled && old_enabled)
+ ret = false;
+ else if (new_enabled && !old_enabled)
+ ret = false;
+ else if (!new_enabled && old_enabled)
+ ret = true;
+ else if (!new_enabled && !old_enabled)
+ ret = false;
+ }
+
+ return ret;
+}
+
static int intel_crtc_set_config(struct drm_mode_set *set)
{
struct drm_device *dev;
@@ -11486,6 +11530,10 @@ static int intel_crtc_set_config(struct drm_mode_set *set)
to_intel_crtc(set->crtc)->config.has_infoframe)
config->mode_changed = true;
+ if (intel_pfit_changed(dev, to_intel_crtc(set->crtc)->new_config,
+ &to_intel_crtc(set->crtc)->config))
+ config->mode_changed = true;
+
intel_update_pipe_size(to_intel_crtc(set->crtc));
if (config->mode_changed) {
--
1.9.1
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