drm/i915: always disable irqs in intel_pipe_update_start

This can only fail because of a bug in the code.

Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
[danvet: Squash in follow-up to also remove start_vbl_count from
intel_crtc->atomic and put it into the intel_crtc directly - it's not
precomputed state.]
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 755389f..bd92e9c 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11247,12 +11247,11 @@ static void ilk_do_mmio_flip(struct intel_crtc *intel_crtc)
 static void intel_do_mmio_flip(struct intel_crtc *intel_crtc)
 {
        struct drm_device *dev = intel_crtc->base.dev;
-       bool atomic_update;
        u32 start_vbl_count;
 
        intel_mark_page_flip_active(intel_crtc);
 
-       atomic_update = intel_pipe_update_start(intel_crtc, &start_vbl_count);
+       intel_pipe_update_start(intel_crtc, &start_vbl_count);
 
        if (INTEL_INFO(dev)->gen >= 9)
                skl_do_mmio_flip(intel_crtc);
@@ -11260,8 +11259,7 @@ static void intel_do_mmio_flip(struct intel_crtc *intel_crtc)
                /* use_mmio_flip() retricts MMIO flips to ilk+ */
                ilk_do_mmio_flip(intel_crtc);
 
-       if (atomic_update)
-               intel_pipe_update_end(intel_crtc, start_vbl_count);
+       intel_pipe_update_end(intel_crtc, start_vbl_count);
 }
 
 static void intel_mmio_flip_work_func(struct work_struct *work)
@@ -13646,9 +13644,7 @@ static void intel_begin_crtc_commit(struct drm_crtc *crtc)
 
        /* Perform vblank evasion around commit operation */
        if (crtc->state->active)
-               intel_crtc->atomic.evade =
-                       intel_pipe_update_start(intel_crtc,
-                                               &intel_crtc->atomic.start_vbl_count);
+               intel_pipe_update_start(intel_crtc, &intel_crtc->start_vbl_count);
 
        if (!needs_modeset(crtc->state) && INTEL_INFO(dev)->gen >= 9)
                skl_detach_scalers(intel_crtc);
@@ -13658,9 +13654,8 @@ static void intel_finish_crtc_commit(struct drm_crtc *crtc)
 {
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 
-       if (intel_crtc->atomic.evade)
-               intel_pipe_update_end(intel_crtc,
-                                     intel_crtc->atomic.start_vbl_count);
+       if (crtc->state->active)
+               intel_pipe_update_end(intel_crtc, intel_crtc->start_vbl_count);
 }
 
 /**

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index cc91ea3..0fcfa7f 100644 (file)
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -488,10 +488,6 @@ struct skl_pipe_wm {
  * and thus can't be run with interrupts disabled.
  */
 struct intel_crtc_atomic_commit {
-       /* vblank evasion */
-       bool evade;
-       unsigned start_vbl_count;
-
        /* Sleepable operations to perform before commit */
        bool wait_for_flips;
        bool disable_fbc;
@@ -559,6 +555,7 @@ struct intel_crtc {
 
        int scanline_offset;
 
+       unsigned start_vbl_count;
        struct intel_crtc_atomic_commit atomic;
 
        /* scalers available on this crtc */
@@ -1385,7 +1382,7 @@ bool intel_sdvo_init(struct drm_device *dev, uint32_t sdvo_reg, bool is_sdvob);
 int intel_plane_init(struct drm_device *dev, enum pipe pipe, int plane);
 int intel_sprite_set_colorkey(struct drm_device *dev, void *data,
                              struct drm_file *file_priv);
-bool intel_pipe_update_start(struct intel_crtc *crtc,
+void intel_pipe_update_start(struct intel_crtc *crtc,
                             uint32_t *start_vbl_count);
 void intel_pipe_update_end(struct intel_crtc *crtc, u32 start_vbl_count);
 

diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
index cd21525..9d8af2f 100644 (file)
--- a/drivers/gpu/drm/i915/intel_sprite.c
+++ b/drivers/gpu/drm/i915/intel_sprite.c
@@ -75,10 +75,8 @@ static int usecs_to_scanlines(const struct drm_display_mode *mode, int usecs)
  * until a subsequent call to intel_pipe_update_end(). That is done to
  * avoid random delays. The value written to @start_vbl_count should be
  * supplied to intel_pipe_update_end() for error checking.
- *
- * Return: true if the call was successful
  */
-bool intel_pipe_update_start(struct intel_crtc *crtc, uint32_t *start_vbl_count)
+void intel_pipe_update_start(struct intel_crtc *crtc, uint32_t *start_vbl_count)
 {
        struct drm_device *dev = crtc->base.dev;
        const struct drm_display_mode *mode = &crtc->config->base.adjusted_mode;
@@ -96,13 +94,14 @@ bool intel_pipe_update_start(struct intel_crtc *crtc, uint32_t *start_vbl_count)
        min = vblank_start - usecs_to_scanlines(mode, 100);
        max = vblank_start - 1;
 
+       local_irq_disable();
+       *start_vbl_count = 0;
+
        if (min <= 0 || max <= 0)
-               return false;
+               return;
 
        if (WARN_ON(drm_crtc_vblank_get(&crtc->base)))
-               return false;
-
-       local_irq_disable();
+               return;
 
        trace_i915_pipe_update_start(crtc, min, max);
 
@@ -138,8 +137,6 @@ bool intel_pipe_update_start(struct intel_crtc *crtc, uint32_t *start_vbl_count)
        *start_vbl_count = dev->driver->get_vblank_counter(dev, pipe);
 
        trace_i915_pipe_update_vblank_evaded(crtc, min, max, *start_vbl_count);
-
-       return true;
 }
 
 /**
@@ -161,7 +158,7 @@ void intel_pipe_update_end(struct intel_crtc *crtc, u32 start_vbl_count)
 
        local_irq_enable();
 
-       if (start_vbl_count != end_vbl_count)
+       if (start_vbl_count && start_vbl_count != end_vbl_count)
                DRM_ERROR("Atomic update failure on pipe %c (start=%u end=%u)\n",
                          pipe_name(pipe), start_vbl_count, end_vbl_count);
 }