drm/i915: Clarify logic for initial modeset

Currently we both set mode->private_flags to some value and also use
the pipe_config quirk. But since the pipe_config quirk isn't tied to
the lifetime of the mode object we need to check both.

Simplify this by only using mode.private_flags and stop using the
INHERITED_MODE quirk. Also for clarity add an explicit #define for
that driver priavete mode flag.

By using crtc_state->mode_changed we can also remove the recalc local
variable.

Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index c29e7ed..ce71552 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13161,7 +13161,11 @@ static int intel_atomic_check(struct drm_device *dev,
        for_each_crtc_in_state(state, crtc, crtc_state, i) {
                struct intel_crtc_state *pipe_config =
                        to_intel_crtc_state(crtc_state);
-               bool modeset, recalc = false;
+               bool modeset;
+
+               /* Catch I915_MODE_FLAG_INHERITED */
+               if (crtc_state->mode.private_flags != crtc->state->mode.private_flags)
+                       crtc_state->mode_changed = true;
 
                if (!crtc_state->enable) {
                        if (needs_modeset(crtc_state))
@@ -13170,28 +13174,22 @@ static int intel_atomic_check(struct drm_device *dev,
                }
 
                modeset = needs_modeset(crtc_state);
-               /* see comment in intel_modeset_readout_hw_state */
-               if (!modeset && crtc_state->mode_blob != crtc->state->mode_blob &&
-                   pipe_config->quirks & PIPE_CONFIG_QUIRK_INHERITED_MODE)
-                       recalc = true;
 
-               if (!modeset && !recalc)
+               if (!modeset)
                        continue;
 
-               if (recalc) {
-                       ret = drm_atomic_add_affected_connectors(state, crtc);
-                       if (ret)
-                               return ret;
-               }
+               ret = drm_atomic_add_affected_connectors(state, crtc);
+               if (ret)
+                       return ret;
 
                ret = intel_modeset_pipe_config(crtc, pipe_config);
                if (ret)
                        return ret;
 
-               if (recalc && (!i915.fastboot ||
+               if (!i915.fastboot ||
                    !intel_pipe_config_compare(state->dev,
                                        to_intel_crtc_state(crtc->state),
-                                       pipe_config, true))) {
+                                       pipe_config, true)) {
                        modeset = crtc_state->mode_changed = true;
 
                        ret = drm_atomic_add_affected_planes(state, crtc);
@@ -15238,8 +15236,6 @@ static void intel_modeset_readout_hw_state(struct drm_device *dev)
                memset(crtc->config, 0, sizeof(*crtc->config));
                crtc->config->base.crtc = &crtc->base;
 
-               crtc->config->quirks |= PIPE_CONFIG_QUIRK_INHERITED_MODE;
-
                crtc->active = dev_priv->display.get_pipe_config(crtc,
                                                                 crtc->config);
 
@@ -15265,17 +15261,11 @@ static void intel_modeset_readout_hw_state(struct drm_device *dev)
                         * right now it would cause a double modeset if
                         * fbdev or userspace chooses a different initial mode.
                         *
-                        * So to prevent the double modeset, fail the memcmp
-                        * test in drm_atomic_set_mode_for_crtc to get a new
-                        * mode blob, and compare if the mode blob changed
-                        * when the PIPE_CONFIG_QUIRK_INHERITED_MODE quirk is
-                        * set.
-                        *
                         * If that happens, someone indicated they wanted a
                         * mode change, which means it's safe to do a full
                         * recalculation.
                         */
-                       crtc->base.state->mode.private_flags = ~0;
+                       crtc->base.state->mode.private_flags = I915_MODE_FLAG_INHERITED;
                }
 
                crtc->base.hwmode = crtc->config->base.adjusted_mode;

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 0fcfa7f..3b00d00 100644 (file)
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -317,6 +317,9 @@ struct intel_crtc_scaler_state {
        int scaler_id;
 };
 
+/* drm_mode->private_flags */
+#define I915_MODE_FLAG_INHERITED 1
+
 struct intel_crtc_state {
        struct drm_crtc_state base;
 
@@ -329,7 +332,6 @@ struct intel_crtc_state {
         * accordingly.
         */
 #define PIPE_CONFIG_QUIRK_MODE_SYNC_FLAGS      (1<<0) /* unreliable sync mode.flags */
-#define PIPE_CONFIG_QUIRK_INHERITED_MODE       (1<<1) /* mode inherited from firmware */
        unsigned long quirks;
 
        /* Pipe source size (ie. panel fitter input size)