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Commit d673c02c authored by Daniel Vetter's avatar Daniel Vetter
Browse files

drm/vblank: Switch drm_driver->get_vblank_timestamp to return a bool 



There's really no reason for anything more:
- Calling this while the crtc vblank stuff isn't set up is a driver
  bug. Those places alrready DRM_ERROR.
- Calling this when the crtc is off is either a driver bug (calling
  drm_crtc_handle_vblank at the wrong time) or a core bug (for
  anything else). Again, we DRM_ERROR.
- EINVAL is checked at higher levels already, and if we'd use struct
  drm_crtc * instead of (dev, pipe) it would be real obvious that
  those are again core bugs.

The only valid failure mode is crap hardware that couldn't sample a
useful timestamp, to ask the core to just grab a not-so-accurate
timestamp. Bool is perfectly fine for that.

v2: Also fix up the one caller, I lost that in the shuffling (Jani).

v3: Fixup commit message (Neil).

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Cc: Eric Anholt <eric@anholt.net>
Cc: Rob Clark <robdclark@gmail.com>
Cc: linux-arm-msm@vger.kernel.org
Cc: freedreno@lists.freedesktop.org
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: default avatarNeil Armstrong <narmstrong@baylibre.com>
Acked-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170509140329.24114-1-daniel.vetter@ffwll.ch
parent 315f0242

drivers/gpu/drm/amd/amdgpu/amdgpu.h

+4 −4
Original line number Diff line number Diff line
@@ -1910,7 +1910,7 @@ int amdgpu_device_resume(struct drm_device *dev, bool resume, bool fbcon); 
u32 amdgpu_get_vblank_counter_kms(struct drm_device *dev, unsigned int pipe);

int amdgpu_enable_vblank_kms(struct drm_device *dev, unsigned int pipe);

void amdgpu_disable_vblank_kms(struct drm_device *dev, unsigned int pipe);

int amdgpu_get_vblank_timestamp_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);

drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c

+7 −7
Original line number Diff line number Diff line
@@ -945,9 +945,9 @@ void amdgpu_disable_vblank_kms(struct drm_device *dev, unsigned int pipe) 
 *

 * Gets the timestamp on the requested crtc based on the

 * scanout position.  (all asics).

 * Returns postive status flags on success, negative error on failure.

 * Returns true on success, false on failure.

 */

int amdgpu_get_vblank_timestamp_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)
@@ -957,7 +957,7 @@ int amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe, 


	if (pipe >= dev->num_crtcs) {

		DRM_ERROR("Invalid crtc %u\n", pipe);

		return -EINVAL;

		return false;

	}



	/* Get associated drm_crtc: */
@@ -966,7 +966,7 @@ int amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe, 
		/* This can occur on driver load if some component fails to

		 * initialize completely and driver is unloaded */

		DRM_ERROR("Uninitialized crtc %d\n", pipe);

		return -EINVAL;

		return false;

	}



	/* Helper routine in DRM core does all the work: */

drivers/gpu/drm/drm_irq.c

+18 −31
Original line number Diff line number Diff line
@@ -724,21 +724,11 @@ EXPORT_SYMBOL(drm_calc_timestamping_constants); 
 * active. Higher level code is expected to handle this.

 *

 * Returns:

 * Negative value on error, failure or if not supported in current

 * video mode:

 *

 * -EINVAL    Invalid CRTC.

 * -EAGAIN    Temporary unavailable, e.g., called before initial modeset.

 * -ENOTSUPP  Function not supported in current display mode.

 * -EIO       Failed, e.g., due to failed scanout position query.

 *

 * Returns or'ed positive status flags on success:

 *

 * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping.

 * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval.

 *

 * Returns true on success, and false on failure, i.e. when no accurate

 * timestamp could be acquired.

 */

int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,

bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,

					   unsigned int pipe,

					   int *max_error,

					   struct timeval *vblank_time,
@@ -748,19 +738,18 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, 
	struct timeval tv_etime;

	ktime_t stime, etime;

	unsigned int vbl_status;

	int ret = DRM_VBLANKTIME_SCANOUTPOS_METHOD;

	int vpos, hpos, i;

	int delta_ns, duration_ns;



	if (pipe >= dev->num_crtcs) {

		DRM_ERROR("Invalid crtc %u\n", pipe);

		return -EINVAL;

		return false;

	}



	/* Scanout position query not supported? Should not happen. */

	if (!dev->driver->get_scanout_position) {

		DRM_ERROR("Called from driver w/o get_scanout_position()!?\n");

		return -EIO;

		return false;

	}



	/* If mode timing undefined, just return as no-op:
@@ -768,7 +757,7 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, 
	 */

	if (mode->crtc_clock == 0) {

		DRM_DEBUG("crtc %u: Noop due to uninitialized mode.\n", pipe);

		return -EAGAIN;

		return false;

	}



	/* Get current scanout position with system timestamp.
@@ -792,7 +781,7 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, 
		if (!(vbl_status & DRM_SCANOUTPOS_VALID)) {

			DRM_DEBUG("crtc %u : scanoutpos query failed [0x%x].\n",

				  pipe, vbl_status);

			return -EIO;

			return false;

		}



		/* Compute uncertainty in timestamp of scanout position query. */
@@ -836,7 +825,7 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, 
		      (long)vblank_time->tv_sec, (long)vblank_time->tv_usec,

		      duration_ns/1000, i);



	return ret;

	return true;

}

EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos);
@@ -872,25 +861,23 @@ static bool 
drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,

			  struct timeval *tvblank, unsigned flags)

{

	int ret;

	bool ret = false;



	/* Define requested maximum error on timestamps (nanoseconds). */

	int max_error = (int) drm_timestamp_precision * 1000;



	/* Query driver if possible and precision timestamping enabled. */

	if (dev->driver->get_vblank_timestamp && (max_error > 0)) {

	if (dev->driver->get_vblank_timestamp && (max_error > 0))

		ret = dev->driver->get_vblank_timestamp(dev, pipe, &max_error,

							tvblank, flags);

		if (ret > 0)

			return true;

	}



	/* GPU high precision timestamp query unsupported or failed.

	 * Return current monotonic/gettimeofday timestamp as best estimate.

	 */

	if (!ret)

		*tvblank = get_drm_timestamp();



	return false;

	return ret;

}



/**

drivers/gpu/drm/i915/i915_irq.c

+4 −4
Original line number Diff line number Diff line
@@ -964,7 +964,7 @@ int intel_get_crtc_scanline(struct intel_crtc *crtc) 
	return position;

}



static int i915_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,

static bool i915_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,

			      int *max_error,

			      struct timeval *vblank_time,

			      unsigned flags)
@@ -974,19 +974,19 @@ static int i915_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe, 


	if (pipe >= INTEL_INFO(dev_priv)->num_pipes) {

		DRM_ERROR("Invalid crtc %u\n", pipe);

		return -EINVAL;

		return false;

	}



	/* Get drm_crtc to timestamp: */

	crtc = intel_get_crtc_for_pipe(dev_priv, pipe);

	if (crtc == NULL) {

		DRM_ERROR("Invalid crtc %u\n", pipe);

		return -EINVAL;

		return false;

	}



	if (!crtc->base.hwmode.crtc_clock) {

		DRM_DEBUG_KMS("crtc %u is disabled\n", pipe);

		return -EBUSY;

		return false;

	}



	/* Helper routine in DRM core does all the work: */

drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c

+6 −6
Original line number Diff line number Diff line
@@ -592,7 +592,7 @@ static int mdp5_get_scanoutpos(struct drm_device *dev, unsigned int pipe, 
	return ret;

}



static int mdp5_get_vblank_timestamp(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)
@@ -602,13 +602,13 @@ static int mdp5_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe, 


	if (pipe < 0 || pipe >= priv->num_crtcs) {

		DRM_ERROR("Invalid crtc %d\n", pipe);

		return -EINVAL;

		return false;

	}



	crtc = priv->crtcs[pipe];

	if (!crtc) {

		DRM_ERROR("Invalid crtc %d\n", pipe);

		return -EINVAL;

		return false;

	}



	return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,