It's overkill to have a flag parameter which is essentially used just
as a boolean. This takes care of core + adjusting drivers.

Adjusting the scanout position callback is a bit harder, since radeon
also supplies it's own driver-private flags in there.

Cc: Mario Kleiner <mario.klei...@tuebingen.mpg.de>
Cc: Eric Anholt <e...@anholt.net>
Cc: Rob Clark <robdcl...@gmail.com>
Cc: linux-arm-...@vger.kernel.org
Cc: freedreno@lists.freedesktop.org
Cc: Alex Deucher <alexander.deuc...@amd.com>
Cc: Christian König <christian.koe...@amd.com>
Cc: Ben Skeggs <bske...@redhat.com>
Reviewed-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vet...@intel.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h       |  2 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c   |  6 ++---
 drivers/gpu/drm/drm_irq.c                 | 41 +++++++++++++++++--------------
 drivers/gpu/drm/i915/i915_irq.c           |  4 +--
 drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c   |  4 +--
 drivers/gpu/drm/nouveau/nouveau_display.c |  5 ++--
 drivers/gpu/drm/nouveau/nouveau_display.h |  2 +-
 drivers/gpu/drm/radeon/radeon_drv.c       |  2 +-
 drivers/gpu/drm/radeon/radeon_kms.c       |  4 +--
 drivers/gpu/drm/vc4/vc4_crtc.c            |  4 +--
 drivers/gpu/drm/vc4/vc4_drv.h             |  2 +-
 include/drm/drm_drv.h                     | 11 ++++-----
 include/drm/drm_irq.h                     |  2 +-
 13 files changed, 46 insertions(+), 43 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h 
b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 0dcc9ee73ab1..310b20ef794a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1916,7 +1916,7 @@ void amdgpu_disable_vblank_kms(struct drm_device *dev, 
unsigned int pipe);
 bool amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
                                     int *max_error,
                                     struct timeval *vblank_time,
-                                    unsigned flags);
+                                    bool in_vblank_irq);
 long amdgpu_kms_compat_ioctl(struct file *filp, unsigned int cmd,
                             unsigned long arg);
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index ba937d763df5..109a77ffc692 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -947,7 +947,7 @@ void amdgpu_disable_vblank_kms(struct drm_device *dev, 
unsigned int pipe)
  * @crtc: crtc to get the timestamp for
  * @max_error: max error
  * @vblank_time: time value
- * @flags: flags passed to the driver
+ * @in_vblank_irq: called from drm_handle_vblank()
  *
  * Gets the timestamp on the requested crtc based on the
  * scanout position.  (all asics).
@@ -956,7 +956,7 @@ void amdgpu_disable_vblank_kms(struct drm_device *dev, 
unsigned int pipe)
 bool amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
                                     int *max_error,
                                     struct timeval *vblank_time,
-                                    unsigned flags)
+                                    bool in_vblank_irq)
 {
        struct drm_crtc *crtc;
        struct amdgpu_device *adev = dev->dev_private;
@@ -977,7 +977,7 @@ bool amdgpu_get_vblank_timestamp_kms(struct drm_device 
*dev, unsigned int pipe,
 
        /* Helper routine in DRM core does all the work: */
        return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
-                                                    vblank_time, flags,
+                                                    vblank_time, in_vblank_irq,
                                                     &crtc->hwmode);
 }
 
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 319ab3661965..82b6e0521fe1 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -54,7 +54,7 @@
 
 static bool
 drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,
-                         struct timeval *tvblank, unsigned flags);
+                         struct timeval *tvblank, bool in_vblank_irq);
 
 static unsigned int drm_timestamp_precision = 20;  /* Default to 20 usecs. */
 
@@ -138,7 +138,7 @@ static void drm_reset_vblank_timestamp(struct drm_device 
*dev, unsigned int pipe
         */
        do {
                cur_vblank = __get_vblank_counter(dev, pipe);
-               rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, 0);
+               rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, false);
        } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0);
 
        /*
@@ -171,7 +171,7 @@ static void drm_reset_vblank_timestamp(struct drm_device 
*dev, unsigned int pipe
  * device vblank fields.
  */
 static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe,
-                                   unsigned long flags)
+                                   bool in_vblank_irq)
 {
        struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
        u32 cur_vblank, diff;
@@ -194,7 +194,7 @@ static void drm_update_vblank_count(struct drm_device *dev, 
unsigned int pipe,
         */
        do {
                cur_vblank = __get_vblank_counter(dev, pipe);
-               rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, flags);
+               rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, 
in_vblank_irq);
        } while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0);
 
        if (dev->max_vblank_count != 0) {
@@ -214,13 +214,13 @@ static void drm_update_vblank_count(struct drm_device 
*dev, unsigned int pipe,
                 */
                diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns);
 
-               if (diff == 0 && flags & DRM_CALLED_FROM_VBLIRQ)
+               if (diff == 0 && in_vblank_irq)
                        DRM_DEBUG_VBL("crtc %u: Redundant vblirq ignored."
                                      " diff_ns = %lld, framedur_ns = %d)\n",
                                      pipe, (long long) diff_ns, framedur_ns);
        } else {
                /* some kind of default for drivers w/o accurate vbl 
timestamping */
-               diff = (flags & DRM_CALLED_FROM_VBLIRQ) != 0;
+               diff = in_vblank_irq ? 1 : 0;
        }
 
        /*
@@ -253,7 +253,7 @@ static void drm_update_vblank_count(struct drm_device *dev, 
unsigned int pipe,
         * Otherwise reinitialize delayed at next vblank interrupt and assign 0
         * for now, to mark the vblanktimestamp as invalid.
         */
-       if (!rc && (flags & DRM_CALLED_FROM_VBLIRQ) == 0)
+       if (!rc && in_vblank_irq)
                t_vblank = (struct timeval) {0, 0};
 
        store_vblank(dev, pipe, diff, &t_vblank, cur_vblank);
@@ -291,7 +291,7 @@ u32 drm_accurate_vblank_count(struct drm_crtc *crtc)
 
        spin_lock_irqsave(&dev->vblank_time_lock, flags);
 
-       drm_update_vblank_count(dev, pipe, 0);
+       drm_update_vblank_count(dev, pipe, false);
        vblank = drm_vblank_count(dev, pipe);
 
        spin_unlock_irqrestore(&dev->vblank_time_lock, flags);
@@ -349,7 +349,7 @@ static void vblank_disable_and_save(struct drm_device *dev, 
unsigned int pipe)
         * this time. This makes the count account for the entire time
         * between drm_crtc_vblank_on() and drm_crtc_vblank_off().
         */
-       drm_update_vblank_count(dev, pipe, 0);
+       drm_update_vblank_count(dev, pipe, false);
 
        spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
 }
@@ -700,9 +700,10 @@ EXPORT_SYMBOL(drm_calc_timestamping_constants);
  * @max_error: Desired maximum allowable error in timestamps (nanosecs)
  *             On return contains true maximum error of timestamp
  * @vblank_time: Pointer to struct timeval which should receive the timestamp
- * @flags: Flags to pass to driver:
- *         0 = Default,
- *         DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler
+ * @in_vblank_irq:
+ *     True when called from drm_crtc_handle_vblank().  Some drivers
+ *     need to apply some workarounds for gpu-specific vblank irq quirks
+ *     if flag is set.
  * @mode: mode which defines the scanout timings
  *
  * Implements calculation of exact vblank timestamps from given 
drm_display_mode
@@ -732,7 +733,7 @@ bool drm_calc_vbltimestamp_from_scanoutpos(struct 
drm_device *dev,
                                           unsigned int pipe,
                                           int *max_error,
                                           struct timeval *vblank_time,
-                                          unsigned flags,
+                                          bool in_vblank_irq,
                                           const struct drm_display_mode *mode)
 {
        struct timeval tv_etime;
@@ -740,6 +741,7 @@ bool drm_calc_vbltimestamp_from_scanoutpos(struct 
drm_device *dev,
        unsigned int vbl_status;
        int vpos, hpos, i;
        int delta_ns, duration_ns;
+       unsigned flags = in_vblank_irq ? DRM_CALLED_FROM_VBLIRQ : 0;
 
        if (pipe >= dev->num_crtcs) {
                DRM_ERROR("Invalid crtc %u\n", pipe);
@@ -843,9 +845,10 @@ static struct timeval get_drm_timestamp(void)
  * @dev: DRM device
  * @pipe: index of CRTC whose vblank timestamp to retrieve
  * @tvblank: Pointer to target struct timeval which should receive the 
timestamp
- * @flags: Flags to pass to driver:
- *         0 = Default,
- *         DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler
+ * @in_vblank_irq:
+ *     True when called from drm_crtc_handle_vblank().  Some drivers
+ *     need to apply some workarounds for gpu-specific vblank irq quirks
+ *     if flag is set.
  *
  * Fetches the system timestamp corresponding to the time of the most recent
  * vblank interval on specified CRTC. May call into kms-driver to
@@ -859,7 +862,7 @@ static struct timeval get_drm_timestamp(void)
  */
 static bool
 drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,
-                         struct timeval *tvblank, unsigned flags)
+                         struct timeval *tvblank, bool in_vblank_irq)
 {
        bool ret = false;
 
@@ -869,7 +872,7 @@ drm_get_last_vbltimestamp(struct drm_device *dev, unsigned 
int pipe,
        /* Query driver if possible and precision timestamping enabled. */
        if (dev->driver->get_vblank_timestamp && (max_error > 0))
                ret = dev->driver->get_vblank_timestamp(dev, pipe, &max_error,
-                                                       tvblank, flags);
+                                                       tvblank, in_vblank_irq);
 
        /* GPU high precision timestamp query unsupported or failed.
         * Return current monotonic/gettimeofday timestamp as best estimate.
@@ -1745,7 +1748,7 @@ bool drm_handle_vblank(struct drm_device *dev, unsigned 
int pipe)
                return false;
        }
 
-       drm_update_vblank_count(dev, pipe, DRM_CALLED_FROM_VBLIRQ);
+       drm_update_vblank_count(dev, pipe, true);
 
        spin_unlock(&dev->vblank_time_lock);
 
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 7595b9a7b5f3..6e1063d3629e 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -967,7 +967,7 @@ int intel_get_crtc_scanline(struct intel_crtc *crtc)
 static bool i915_get_vblank_timestamp(struct drm_device *dev, unsigned int 
pipe,
                              int *max_error,
                              struct timeval *vblank_time,
-                             unsigned flags)
+                             bool in_vblank_irq)
 {
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_crtc *crtc;
@@ -991,7 +991,7 @@ static bool i915_get_vblank_timestamp(struct drm_device 
*dev, unsigned int pipe,
 
        /* Helper routine in DRM core does all the work: */
        return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
-                                                    vblank_time, flags,
+                                                    vblank_time, in_vblank_irq,
                                                     &crtc->base.hwmode);
 }
 
diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c 
b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
index 655700eb42ba..16184ccbdd3b 100644
--- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
+++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
@@ -598,7 +598,7 @@ static int mdp5_get_scanoutpos(struct drm_device *dev, 
unsigned int pipe,
 static bool mdp5_get_vblank_timestamp(struct drm_device *dev, unsigned int 
pipe,
                                      int *max_error,
                                      struct timeval *vblank_time,
-                                     unsigned flags)
+                                     bool in_vblank_irq)
 {
        struct msm_drm_private *priv = dev->dev_private;
        struct drm_crtc *crtc;
@@ -615,7 +615,7 @@ static bool mdp5_get_vblank_timestamp(struct drm_device 
*dev, unsigned int pipe,
        }
 
        return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
-                                                    vblank_time, flags,
+                                                    vblank_time, in_vblank_irq,
                                                     &crtc->mode);
 }
 
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c 
b/drivers/gpu/drm/nouveau/nouveau_display.c
index 9375f41da523..c7caa0674c54 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -158,7 +158,7 @@ nouveau_display_scanoutpos(struct drm_device *dev, unsigned 
int pipe,
 
 bool
 nouveau_display_vblstamp(struct drm_device *dev, unsigned int pipe,
-                        int *max_error, struct timeval *time, unsigned flags)
+                        int *max_error, struct timeval *time, bool 
in_vblank_irq)
 {
        struct drm_crtc *crtc;
 
@@ -170,7 +170,8 @@ nouveau_display_vblstamp(struct drm_device *dev, unsigned 
int pipe,
                        else
                                mode = &crtc->hwmode;
                        return drm_calc_vbltimestamp_from_scanoutpos(dev,
-                                       pipe, max_error, time, flags, mode);
+                                       pipe, max_error, time, in_vblank_irq,
+                                       mode);
                }
        }
 
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.h 
b/drivers/gpu/drm/nouveau/nouveau_display.h
index c6bfe533a641..8ec86259c5ac 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.h
+++ b/drivers/gpu/drm/nouveau/nouveau_display.h
@@ -72,7 +72,7 @@ int  nouveau_display_scanoutpos(struct drm_device *, unsigned 
int,
                                unsigned int, int *, int *, ktime_t *,
                                ktime_t *, const struct drm_display_mode *);
 bool  nouveau_display_vblstamp(struct drm_device *, unsigned int, int *,
-                              struct timeval *, unsigned);
+                              struct timeval *, bool);
 
 int  nouveau_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
                            struct drm_pending_vblank_event *event,
diff --git a/drivers/gpu/drm/radeon/radeon_drv.c 
b/drivers/gpu/drm/radeon/radeon_drv.c
index caa0b1cc4269..88fc791ec8fb 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -118,7 +118,7 @@ void radeon_disable_vblank_kms(struct drm_device *dev, 
unsigned int pipe);
 bool radeon_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
                                     int *max_error,
                                     struct timeval *vblank_time,
-                                    unsigned flags);
+                                    bool in_vblank_irq);
 void radeon_driver_irq_preinstall_kms(struct drm_device *dev);
 int radeon_driver_irq_postinstall_kms(struct drm_device *dev);
 void radeon_driver_irq_uninstall_kms(struct drm_device *dev);
diff --git a/drivers/gpu/drm/radeon/radeon_kms.c 
b/drivers/gpu/drm/radeon/radeon_kms.c
index 535969d74f64..5bccdeae0773 100644
--- a/drivers/gpu/drm/radeon/radeon_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_kms.c
@@ -874,7 +874,7 @@ void radeon_disable_vblank_kms(struct drm_device *dev, int 
crtc)
 bool radeon_get_vblank_timestamp_kms(struct drm_device *dev, int crtc,
                                     int *max_error,
                                     struct timeval *vblank_time,
-                                    unsigned flags)
+                                    bool in_vblank_irq)
 {
        struct drm_crtc *drmcrtc;
        struct radeon_device *rdev = dev->dev_private;
@@ -891,7 +891,7 @@ bool radeon_get_vblank_timestamp_kms(struct drm_device 
*dev, int crtc,
 
        /* Helper routine in DRM core does all the work: */
        return drm_calc_vbltimestamp_from_scanoutpos(dev, crtc, max_error,
-                                                    vblank_time, flags,
+                                                    vblank_time, in_vblank_irq,
                                                     &drmcrtc->hwmode);
 }
 
diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
index 60fefe9d7b8c..38f5cc740cd1 100644
--- a/drivers/gpu/drm/vc4/vc4_crtc.c
+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
@@ -272,14 +272,14 @@ int vc4_crtc_get_scanoutpos(struct drm_device *dev, 
unsigned int crtc_id,
 
 bool vc4_crtc_get_vblank_timestamp(struct drm_device *dev, unsigned int 
crtc_id,
                                  int *max_error, struct timeval *vblank_time,
-                                 unsigned flags)
+                                 bool in_vblank_irq)
 {
        struct drm_crtc *crtc = drm_crtc_from_index(dev, crtc_id);
        struct drm_crtc_state *state = crtc->state;
 
        /* Helper routine in DRM core does all the work: */
        return drm_calc_vbltimestamp_from_scanoutpos(dev, crtc_id, max_error,
-                                                    vblank_time, flags,
+                                                    vblank_time, in_vblank_irq,
                                                     &state->adjusted_mode);
 }
 
diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
index 8a5d0e12ee02..815cdeb54971 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.h
+++ b/drivers/gpu/drm/vc4/vc4_drv.h
@@ -452,7 +452,7 @@ int vc4_crtc_get_scanoutpos(struct drm_device *dev, 
unsigned int crtc_id,
                            const struct drm_display_mode *mode);
 bool vc4_crtc_get_vblank_timestamp(struct drm_device *dev, unsigned int 
crtc_id,
                                  int *max_error, struct timeval *vblank_time,
-                                 unsigned flags);
+                                 bool in_vblank_irq);
 
 /* vc4_debugfs.c */
 int vc4_debugfs_init(struct drm_minor *minor);
diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
index da78e248d9d8..9fe6301edd6a 100644
--- a/include/drm/drm_drv.h
+++ b/include/drm/drm_drv.h
@@ -308,11 +308,10 @@ struct drm_driver {
         *     Returns true upper bound on error for timestamp.
         * vblank_time:
         *     Target location for returned vblank timestamp.
-        * flags:
-        *     0 = Defaults, no special treatment needed.
-        *     DRM_CALLED_FROM_VBLIRQ = Function is called from vblank
-        *     irq handler. Some drivers need to apply some workarounds
-        *     for gpu-specific vblank irq quirks if flag is set.
+        * in_vblank_irq:
+        *     True when called from drm_crtc_handle_vblank().  Some drivers
+        *     need to apply some workarounds for gpu-specific vblank irq quirks
+        *     if flag is set.
         *
         * Returns:
         *
@@ -322,7 +321,7 @@ struct drm_driver {
        bool (*get_vblank_timestamp) (struct drm_device *dev, unsigned int pipe,
                                     int *max_error,
                                     struct timeval *vblank_time,
-                                    unsigned flags);
+                                    bool in_vblank_irq);
 
        /* these have to be filled in */
 
diff --git a/include/drm/drm_irq.h b/include/drm/drm_irq.h
index f0d5ccf9b282..445406efb8dc 100644
--- a/include/drm/drm_irq.h
+++ b/include/drm/drm_irq.h
@@ -156,7 +156,7 @@ u32 drm_accurate_vblank_count(struct drm_crtc *crtc);
 bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
                                           unsigned int pipe, int *max_error,
                                           struct timeval *vblank_time,
-                                          unsigned flags,
+                                          bool in_vblank_irq,
                                           const struct drm_display_mode *mode);
 void drm_calc_timestamping_constants(struct drm_crtc *crtc,
                                     const struct drm_display_mode *mode);
-- 
2.11.0

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